Publication - Research and analysis
Energy Efficiency Standard for Social Housing: peer review
Peer review scrutinising the example dwellings in the Energy Efficiency Standard for Social Housing consultation document.
Annex H Modelling for Additional Case Studies
Hard-to-Treat Case studies 1 - 2: Pre 1919 solid wall flats
| Case study HTT-1E: Pre 1919 solid wall dwelling - ground floor (2 bed) (109m 2) , gable end | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,636 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | - | Internal insulation (£5,500) |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,768 | - | £15,168 |
| Annual fuel cost savings | - | £406 | - | £806 |
| Percentage annual fuel cost savings | - | 25% | - | 49% |
| SAP Rating | E (44) | D (58) | - | C (72) |
| EI Rating | F (25) | F (34) | - | E (52) |
| Approximate CO 2 emissions kg/m 2/year | 601 | 484 | - | 315 |
| Percentage CO 2 improvement | - | 23% | - | 49% |
| Case study HTT-1G: Pre 1919 solid wall dwelling - ground floor (2 bed) (109m 2), gable end | ||||
|---|---|---|---|---|
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,416 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | - | Internal insulation (£5,500) |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £3,718 | £6,518 | £16,918 |
| Annual fuel cost savings | - | £117 | £539 | £766 |
| Percentage annual fuel cost savings | - | 8% | 38% | 54% |
| SAP Rating | E (49) | E (53) | D (68) | C (77) |
| EI Rating | E (44) | E (47) | D (66) | C (76) |
| Approximate CO 2 emissions kg/m 2/year | 346 | 318 | 202 | 140 |
| Percentage CO 2 improvement | - | 8% | 41% | 60% |
The next two examples replicate the ground floor tenements of archetypes HTT-1E and HTT-1G, but use in-situ u-values instead of the default RdSAP u-values. They also use the actual costs for the floor and secondary glazing measures that were actually carried out on the archetype that HTT-1E and HTT-1G is based on.
The actual in-situ u-values for this archetype were 3.5 W/m 2K for the solid floor and 0.6 W/m 2K for the insulated floor. As RdSAP can only work within the range of 0.1 - 2.3 W/m 2K for a floor, 2.3 W/m 2K was selected for the actual baseline floor u-value. Compared to the default of 0.5 W/m 2K as calculated by RdSAP in the previous examples, 2.3 W/m 2K is still of poor thermal performance in comparison. The improved u-value of 0.6 W/m 2K was input for the insulated floor compared to 0.28 W/m 2K which is the default value for this floor with insulation of no specific thickness.
The single glazed windows had been tested in-situ and a u-value of 5.5 W/m 2K was measured. User defined u-values for windows can only be entered into RdSAP for multiple glazed windows. Therefore these were entered as double glazed in order to alter the u-value. However it was found that this u-value was out of range and the highest u-value accepted (5.1 W/m 2K) was selected. This closely compares to the default of 4.8 W/m 2K.
For window improvements secondary glazing with an in situ u-value of 2.3 W/m 2K was input, compared to 3.1 W/m 2K for pre-2003 double glazing and 2.0 W/m 2K for post 2003 double glazing.
The in-situ u-value of 1.4 W/m 2K for the sandstone wall was selected as compared to 2.0 W/m 2K for a sandstone wall with no unknown / default wall thickness. As there were no in situ wall insulation work carried out, this measure was kept as the default u-value of 0.6 W/m 2K.
The actual costs for floor insulation and secondary glazing were used. These costs were £9.434 for floor insulation and £5,040 for secondary glazing, compared to £1,200 and £3,700 used in HTT-1E and HTT-1G.
For these archetypes, the adjustments of the u-values make the expected thermal performance of this dwelling before and after improvements less efficient compared to the default assumptions. Similarly the costs for the measures are higher.
| Case study HTT-1E: Pre 1919 solid wall dwelling - ground floor (2 bed), gable end (actual costs and u-values) (109m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £2,411 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | - | Internal insulation (£5,500) |
| Floor | No insulation | - | - | Insulation (£9,434*) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% secondary glazing (£5,040*) | - | - |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £6,108 | - | £21,042 |
| Annual fuel cost savings | - | £623 | - | £1,447 |
| Percentage annual fuel cost savings | - | 26% | - | 60% |
| SAP Rating | F (23) | E (39) | - | D (67) |
| EI Rating | G (8) | G (18) | - | E (45) |
| Approximate CO 2 emissions kg/m 2/year | 902 | 718 | - | 370 |
| Percentage CO 2 improvement | - | 18% | - | 58% |
| * - Actual costs of installation | ||||
| Case study HTT-1G: Pre 1919 solid wall dwelling - ground floor (2 bed), gable end (actual costs and u-values) (109m 2) | ||||
|---|---|---|---|---|
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,884 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | - | Internal insulation (£5,500) |
| Floor | No insulation | - | - | Insulation (£9,434*) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% secondary glazing (£5,040*) | - | - |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) | - |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £5,058 | £7,858 | £22,792 |
| Annual fuel cost savings | - | £113 | £697 | £1,155 |
| Percentage annual fuel cost savings | - | 6% | 37% | 61% |
| SAP Rating | F (33) | F (37) | D (57) | C (74) |
| EI Rating | F (31) | F (33) | E (52) | C (73) |
| Approximate CO 2 emissions kg/m 2/year | 474 | 447 | 287 | 161 |
| Percentage CO 2 improvement | - | 6% | 40% | 66% |
| * - Actual costs of installation | ||||
| Case study HTT-2E: Pre 1919 solid wall dwelling - top floor (3 bed) (126m 2); gable end, partial flat roof | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £2,902 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | - | Internal insulation (£5,500) |
| Floor | - | - | - | - |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) and flat roof insulation (£1,175) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
100% double glazing (post 2003) (£3,700) |
- |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £1,668 | £6,826 | £12,326 |
| Annual fuel cost savings | - | £970 | £1,619 | £1,940 |
| Percentage annual fuel cost savings | - | 33% | 56% | 67% |
| SAP Rating | G (19) | E (40) | D (60) | C (70) |
| EI Rating | G (5) | G (19) | F (37) | E (50) |
| Approximate CO 2 emissions kg/m 2/year | 949 | 675 | 437 | 319 |
| Percentage CO 2 improvement | - | 29% | 54% | 66% |
| Case study HTT-2G: Pre 1919 solid wall dwelling - top floor (3 bed) (126m 2), gable end partial flat roof | ||||
|---|---|---|---|---|
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £2,201 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | - | Internal insulation (£5,500) |
| Floor | - | - | - | - |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) and flat roof insulation (£1,175) |
- |
| Windows | 100% single glazing | 100% draughtproofing (£100) |
100% double glazing (post 2003) (£3,700) | - |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £618 | £8,576 | £14,076 |
| Annual fuel cost savings | - | £284 | £1,287 | £1,469 |
| Percentage annual fuel cost savings | - | 13% | 58% | 67% |
| SAP Rating | F (31) | F (38) | C (70) | C (76) |
| EI Rating | F (28) | F (34) | D (68) | C (75) |
| Approximate CO 2 emissions kg/m 2/year | 486 | 422 | 184 | 140 |
| Percentage CO 2 improvement | - | 17% | 63% | 72% |
Hard-to-Treat case studies 3 - 4: System built Multi-storey flats 1950-64
| Case study HTT-3E: System built Multi-storey flat 1950-64 - ground floor gable end (2 bed) (69m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,012 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,765 | £10,265 | £15,165 |
| Annual fuel cost savings | - | £250 | £288 | £555 |
| Percentage annual fuel cost savings | - | 25% | 28% | 55% |
| SAP Rating | E (53) | D (65) | C (74) | C (79) |
| EI Rating | F (33) | E (43) | D (57) | D (66) |
| Approximate CO 2 emissions kg/m 2/year | 575 | 461 | 324 | 258 |
| Percentage CO 2 improvement | - | 20% | 44% | 55% |
| Case study HTT-3G: System built Multi-storey flat 1950-64 - ground floor gable end (electric - gas community heating) (2 bed) (69m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity - Gas | ||||
| Baseline annual fuel costs: £1,012 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) | - |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Gas communal heating (£12,209*) |
- | - |
| Heating system controls | Manual charge control | Flat rate charging, programmer and TRVs (included in communal heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | From communal heating with 80mm factory applied foam (included in communal heating costs) | - | - |
| Secondary space heating | Electric room heater | None | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £15,924 | £21,424 | £26,324 |
| Annual fuel cost savings | - | £350 | £486 | £563 |
| Percentage annual fuel cost savings | - | 35% | 48% | 56% |
| SAP Rating | E (53) | D (68) | C (75) | C (78) |
| EI Rating | F (33) | D (65) | C (75) | C (79) |
| Approximate CO 2 emissions kg/m 2/year | 575 | 240 | 174 | 144 |
| Percentage CO 2 improvement | - | 55% | 68% | 73% |
| * - Actual costs of installation (includes energy centre built out-with building) | ||||
| Case study HTT-4E: System built Multi-storey flat 1950-64 - mid floor gable end (2 bed) (69m 2) | ||||
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £808 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | - | - | - | - |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,765 | £10,265 | £13,965 |
| Annual fuel cost savings | - | £212 | £431 | £466 |
| Percentage annual fuel cost savings | - | 26% | 53% | 58% |
| SAP Rating | D (63) | C (72) | B (83) | B (84) |
| EI Rating | E (44) | E (54) | C (73) | C (76) |
| Approximate CO 2 emissions kg/m 2/year | 449 | 351 | 206 | 182 |
| Percentage CO 2 improvement | - | 22% | 55% | 60% |
| Case study HTT-4G: System built Multi-storey flat 1950-64 - mid floor gable end (electric - gas community heating) (2 bed) (69m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity - Gas | ||||
| Baseline annual fuel costs: £808 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | - | - | - | - |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Gas communal heating (£12,209*) |
- | - |
| Heating system controls | Manual charge control | Flat rate charging, programmer and TRVs (included in communal heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | From communal heating with 80mm factory applied foam (included in communal heating costs) | - | - |
| Secondary space heating | Electric room heater | None | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £15,924 | £21,424 | £25,124 |
| Annual fuel cost savings | - | £262 | £411 | £445 |
| Percentage annual fuel cost savings | - | 32% | 51% | 55% |
| SAP Rating | D (63) | C (73) | B (81) | B (82) |
| EI Rating | E (44) | C (73) | B (83) | B (85) |
| Approximate CO 2 emissions kg/m 2/year | 449 | 187 | 117 | 105 |
| Percentage CO 2 improvement | - | 55% | 71% | 75% |
| * - Actual costs of installation (includes energy centre built out-with building) | ||||
Hard-to-treat case studies 5 - 8 - System built flats 1950-64
| Case study HTT-5E: 1950-64 System built external deck access flat, ground floor gable end (2 bed) (58m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,082 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,765 | £10,265 | £15,165 |
| Annual fuel cost savings | - | £273 | £535 | £635 |
| Percentage annual fuel cost savings | - | 25% | 49% | 59% |
| SAP Rating | E (45) | D (59) | C (72) | C (77) |
| EI Rating | F (26) | F (36) | E (54) | D (63) |
| Approximate CO 2 emissions kg/m 2/year | 730 | 581 | 377 | 299 |
| Percentage CO 2 improvement | - | 21% | 48% | 60% |
| Case study HTT-5G: 1950-64 System built external deck access flat, ground floor gable end (2 bed) (58m 2) | ||||
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £983 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £3,715 | £9,215 | £14,115 |
| Annual fuel cost savings | - | £74 | £503 | £568 |
| Percentage annual fuel cost savings | - | 8% | 51% | 58% |
| SAP Rating | E (47) | E (51) | C (75) | C (78) |
| EI Rating | E (44) | E (48) | C (77) | B (81) |
| Approximate CO 2 emissions kg/m 2/year | 425 | 392 | 171 | 142 |
| Percentage CO 2 improvement | - | 8% | 61% | 67% |
| Case study HTT-6E: 1950-64 System built external deck access flat, mid floor gable end (2 bed) (67m 2) | ||||
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £835 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | - | - | - | - |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,765 | £10,265 | £13,965 |
| Annual fuel cost savings | - | £212 | £460 | £493 |
| Percentage annual fuel cost savings | - | 25% | 55% | 59% |
| SAP Rating | D (61) | C (70) | B (82) | B (84) |
| EI Rating | E (41) | E (51) | C (72) | C (75) |
| Approximate CO 2 emissions kg/m 2/year | 486 | 385 | 216 | 190 |
| Percentage CO 2 improvement | - | 21% | 56% | 61% |
| Case study HTT-6G: 1950-64 System built external deck access flat, mid floor gable end (2 bed) (67m 2) | ||||
|---|---|---|---|---|
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £836 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | - | - | - | - |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £3,718 | £9,218 | £12,918 |
| Annual fuel cost savings | - | £90 | £452 | £480 |
| Percentage annual fuel cost savings | - | 11% | 54% | 57% |
| SAP Rating | D (58) | D (62) | B (81) | B (82) |
| EI Rating | D (55) | D (60) | B (84) | B (86) |
| Approximate CO 2 emissions kg/m 2/year | 310 | 275 | 109 | 100 |
| Percentage CO 2 improvement | - | 13% | 65% | 68% |
The No Fines archetypes ( HTT-7E, HTT-7G, HTT-8E and HTT-8G) have been modelled using actual u-values based on drawings of the building's construction. Improved u-values were calculated based on insulation specification.
- The main walls were calculated as having a u-value of 1.53 W/m 2K and 0.713 W/m 2K when improved by installing 75mm of external insulation cladding.
- The sheltered wall was calculated as having a u-value of 0.923 W/m 2K and 0.546 W/m2K when improved by installing 75mm of external insulation cladding.
- The floors when improved were calculated to have a u-value of 0.302 W/m 2K.
These have been modelled here with all the default values
- 2.0 W/m 2K for the main walls and 0.6 W/m 2K when improved
- the sheltered wall as 1.11 W/m 2K and 0.48 W/m 2K when improved
- The floors of the ground floor archetype (HTT-7) are defaulted as having an improved u-value of 0.34 W/m 2K.
In this instance the baseline "user defined" fabric performance of the dwelling is greater than the default assumptions and have better results. However, when the improvements are modelled, the improved fabric performance is marginally poorer than the default assumed improved settings. Therefore, the default results are slightly better when the fabric improvements are modelled.
| Case study HTT-7E: 1950-1964 No Fines concrete flat (2 bed) - ground floor, gable end (user defined u-values) (65m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,099 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | External insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,765 | £10,265 | £15,165 |
| Annual fuel cost savings | - | £251 | £420 | £531 |
| Percentage annual fuel cost savings | - | 23% | 38% | 48% |
| SAP Rating | E (47) | D (59) | D (67) | C (73) |
| EI Rating | F (28) | F (36) | E (46) | E (54) |
| Approximate CO 2 emissions kg/m 2/year | 676 | 557 | 433 | 357 |
| Percentage CO 2 improvement | - | 18% | 36% | 47% |
| Case study HTT-7G: 1950-64 No Fines concrete flat (2 bed) - ground floor, gable end (user defined u-values) (65m 2) | ||||
|---|---|---|---|---|
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,003 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | External insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) | - | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £3,718 | £12,018 | £16,918 |
| Annual fuel cost savings | - | £78 | £446 | £524 |
| Percentage annual fuel cost savings | - | 8% | 44% | 52% |
| SAP Rating | E (49) | E (53) | C (72) | C (76) |
| EI Rating | E (46) | E (49) | C (73) | C (78) |
| Approximate CO 2 emissions kg/m 2/year | 397 | 365 | 191 | 159 |
| Percentage CO 2 improvement | - | 8% | 52% | 60% |
| Case study HTT-7E: 1950-1964 No Fines concrete flat (2 bed) - ground floor, gable end (default u-values) (65m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,224 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | External insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,765 | £10,265 | £15,165 |
| Annual fuel cost savings | - | £307 | £563 | £683 |
| Percentage annual fuel cost savings | - | 25% | 46% | 56% |
| SAP Rating | E (41) | D (56) | D (68) | C (74) |
| EI Rating | F (23) | F (32) | E (48) | D (57) |
| Approximate CO 2 emissions kg/m 2/year | 758 | 606 | 421 | 338 |
| Percentage CO 2 improvement | - | 21% | 45% | 55% |
| Case study HTT-7G: 1950-64 No Fines concrete flat (2 bed) - ground floor, gable end (default u-values) (65m 2) | ||||
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,079 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | External insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | - | - | - | - |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £3,718 | £12,018 | £16,918 |
| Annual fuel cost savings | - | £77 | £532 | £608 |
| Percentage annual fuel cost savings | - | 7% | 49% | 56% |
| SAP Rating | E (45) | E (49) | C (73) | C (76) |
| EI Rating | E (42) | E (45) | C (74) | C (78) |
| Approximate CO 2 emissions kg/m 2/year | 432 | 401 | 186 | 155 |
| Percentage CO 2 improvement | - | 7% | 57% | 65% |
| Case study HTT-8E: 1950-64 No Fines concrete flat (2 bed) - top floor, gable end (user defined u-values) (65m 2) | ||||
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,533 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | External insulation (£5,500) |
- |
| Floor | - | - | - | - |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £5,265 | £11,048 | £14,748 |
| Annual fuel cost savings | - | £787 | £982 | £1,017 |
| Percentage annual fuel cost savings | - | 51% | 64% | 66% |
| SAP Rating | F (29) | D (64) | C (74) | C (75) |
| EI Rating | G (13) | E (42) | D (56) | D (59) |
| Approximate CO 2 emissions kg/m 2/year | 963 | 484 | 344 | 320 |
| Percentage CO 2 improvement | - | 49% | 65% | 66% |
| Case study HTT-8G: 1950-1964 No Fines concrete flat (2 bed) - top floor, gable end (user defined u-values) (65m 2) | ||||
|---|---|---|---|---|
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,253 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | External insulation (£5,500) |
- |
| Floor | - | - | - | - |
| Roof | No insulation | 100mm at joists (£500) | 250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,218 | £12,801 | £16,501 |
| Annual fuel cost savings | - | £398 | £785 | £797 |
| Percentage annual fuel cost savings | - | 32% | 63% | 64% |
| SAP Rating | F (37) | D (56) | C (77) | C (77) |
| EI Rating | F (35) | E (53) | C (79) | C (79) |
| Approximate CO 2 emissions kg/m 2/year | 512 | 333 | 150 | 149 |
| Percentage CO 2 improvement | - | 34% | 70% | 72% |
| Case study HTT-8E: 1950-1964 No Fines concrete flat (2 bed) - top floor, gable end (default u-values) (65m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,676 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | External insulation (£5,500) |
- |
| Floor | - | - | - | - |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £5,265 | £11,048 | £14,748 |
| Annual fuel cost savings | - | £825 | £1,142 | £1,176 |
| Percentage annual fuel cost savings | - | 49% | 68% | 70% |
| SAP Rating | F (25) | D (59) | C (74) | C (76) |
| EI Rating | G (9) | F (36) | D (57) | D (60) |
| Approximate CO 2 emissions kg/m 2/year | 1057 | 558 | 332 | 309 |
| Percentage CO 2 improvement | - | 47% | 68% | 71% |
| Case study HTT-8G: 1950-1964 No Fines concrete flat (2 bed) - top floor, gable end (default u-values) (65m 2) | ||||
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,325 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | External insulation (£5,500) |
- |
| Floor | - | - | - | - |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£15) |
- | - |
| Solar PVs | None | - | - | - |
| Total cost of all measures applied since baseline | - | £4,218 | £12,801 | £16,501 |
| Annual fuel cost savings | - | £379 | £851 | £877 |
| Percentage annual fuel cost savings | - | 29% | 64% | 66% |
| SAP Rating | F (34) | E (52) | C (76) | C (77) |
| EI Rating | F (32) | E (48) | C (78) | C (80) |
| Approximate CO 2 emissions kg/m 2/year | 546 | 375 | 153 | 145 |
| Percentage CO 2 improvement | - | 31% | 72% | 74% |
Case studies 9 - 12 - Concrete, Steel frame and timber houses
The following Swedish timber archetype ( HTT-9E and HTT-9G) use u-values based on actual wall construction and u-value calculations and make comparisons against the default values in RdSAP.
The user defined u-values of the main wall were calculated using record drawings of the wall construction and specification of insulation materials. Either external or internal wall insulation could be applied. The improved u-value could be obtained from either insulation method. The u-values modelled were: 1.241 W/m 2K (pre) / 0.253 W/m 2K (post).
These were compared against the default u-values for system built 2.0 W/m 2K (pre) and the default unknown wall insulation of 0.6 W/m 2K (post). Where the previous example used 150mm floor ins to obtain a u-value of 0.17 W/m 2K, based on specifications, these examples use the default unknown retro floor insulation and gives the u-value of 0.35 W/m 2K.
For this case study the fabric performance of the dwelling before and after improvements is greater than the default assumptions built into RdSAP. The RdSAP results are therefore better for this particular archetype by using details of the actual property's characteristics.
| Case study HTT-9E: Swedish timer frame semi-detached (3 bed - 1946) (user defined u-values) (90m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,919 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | Internal or external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | No insulation | 250mm at joists (£500) |
- | - |
| Windows | 100% single glazing | 100% double glazing (post 2003) (£3,700) |
- | - |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £5,268 | £10,768 | £19,968 |
| Annual fuel cost savings | - | £881 | £1,148 | £1,238 |
| Percentage annual fuel cost savings | - | 46% | 60% | 65% |
| SAP Rating | F (29) | D (59) | C (70) | C (79) |
| EI Rating | G (13) | F (36) | E (50) | D (60) |
| Approximate CO 2 emissions kg/m 2/year | 872 | 494 | 353 | 284 |
| Percentage CO 2 improvement | - | 44% | 60% | 68% |
| Case study HTT-9G: Swedish timer frame semi-detached (3 bed - 1946) (user defined u-values) (90m 2) | ||||
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,559 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | Internal or external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £4,218 | £12,801 | £25,701 |
| Annual fuel cost savings | - | £342 | £903 | £993 |
| Percentage annual fuel cost savings | - | 22% | 58% | 64% |
| SAP Rating | F (37) | E (50) | C (73) | B (82) |
| EI Rating | F (34) | E (45) | C (73) | B (82) |
| Approximate CO 2 emissions kg/m 2/year | 470 | 360 | 169 | 116 |
| Percentage CO 2 improvement | - | 23% | 64% | 75% |
| Case study HTT-9E: Swedish timer frame semi-detached (3 bed - 1946) (default u-values) (90m 2) | ||||
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £2,189 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | Internal or external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | No insulation | 250mm at joists (£500) |
- | - |
| Windows | 100% single glazing | 100% double glazing (post 2003) (£3,700) |
- | - |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £5,265 | £10,765 | £19,965 |
| Annual fuel cost savings | - | £956 | £1,317 | £1,377 |
| Percentage annual fuel cost savings | - | 44% | 60% | 63% |
| SAP Rating | F (22) | E (52) | D (66) | C (73) |
| EI Rating | G (7) | F (28) | E (44) | E (51) |
| Approximate CO 2 emissions kg/m 2/year | 1001 | 594 | 404 | 351 |
| Percentage CO 2 improvement | - | 41% | 60% | 65% |
| Case study HTT-9G: Swedish timer frame semi-detached (3 bed - 1946) (default u-values) (90m 2) | ||||
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,700 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | Internal or external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £4,218 | £12,801 | £25,701 |
| Annual fuel cost savings | - | £322 | £989 | £1,061 |
| Percentage annual fuel cost savings | - | 19% | 58% | 62% |
| SAP Rating | F (32) | E (43) | C (71) | C (79) |
| EI Rating | F (30) | E (39) | C (70) | C (78) |
| Approximate CO 2 emissions kg/m 2/year | 517 | 414 | 187 | 141 |
| Percentage CO 2 improvement | - | 20% | 64% | 72% |
| Case study HTT-10E: 1950-1982 Timber frame semi-detached (3 bed - late 1960 / early 1970s) (92m 2) | ||||
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £1,633.50 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | - | - |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | 12mm insulation | 250mm at joists (£500) |
- | - |
| Windows | 100% single glazing | 100% double glazing (post 2003) (£3,700) |
- | - |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £5,268 | - | £14,468 |
| Annual fuel cost savings | - | £761 | - | £813 |
| Percentage annual fuel cost savings | - | 47% | - | 50% |
| SAP Rating | E (41) | D (66) | - | C (74) |
| EI Rating | F (22) | E (45) | - | E (51) |
| Approximate CO 2 emissions kg/m 2/year | 682 | 399 | - | 346 |
| Percentage CO 2 improvement | - | 41% | - | 49% |
| Case study HTT-10G: 1950-1982 Timber frame semi-detached (3 bed - late 1960 / early 1970s) (92m 2) | ||||
|---|---|---|---|---|
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,354 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | - | - |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | 12mm insulation | 100mm at joists (£500) |
250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £4,218 | £7,301 | £20,201 |
| Annual fuel cost savings | - | £279 | £650 | £710 |
| Percentage annual fuel cost savings | - | 21% | 48% | 52% |
| SAP Rating | E (45) | D (56) | C (71) | C (79) |
| EI Rating | E (41) | E (51) | C (71) | C (78) |
| Approximate CO 2 emissions kg/m 2/year | 393 | 306 | 185 | 139 |
| Percentage CO 2 improvement | - | 23% | 53% | 64% |
| Case study HTT-11E: System built concrete semi-detached house (Orlit - 3 bed - 1930-49) (104m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £2,347 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | No insulation | 250mm at joists (£500) |
- | - |
| Windows | 100% single glazing | 100% double glazing (post 2003) (£3,700) |
- | - |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £5,265 | £10,765 | £19,965 |
| Annual fuel cost savings | - | £1,020 | £1,511 | £1,575 |
| Percentage annual fuel cost savings | - | 43% | 64% | 67% |
| SAP Rating | F (23) | E (54) | C (71) | C (78) |
| EI Rating | G (8) | F (30) | E (51) | D (59) |
| Approximate CO 2 emissions kg/m 2/year | 925 | 543 | 331 | 279 |
| Percentage CO 2 improvement | - | 41% | 64% | 70% |
| Case study HTT-11G: System built concrete semi-detached house (Orlit - 3 bed - 1930-49) (104m 2) | ||||
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,832 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- | - |
| Heating system controls | Programmer | Time and temperature zone controls (£300) |
- | - |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £7,018 | £12,801 | £25,701 |
| Annual fuel cost savings | - | £862 | £1,136 | £1,215 |
| Percentage annual fuel cost savings | - | 47% | 62% | 66% |
| SAP Rating | F (33) | D (64) | C (75) | B (82) |
| EI Rating | F (31) | D (60) | C (74) | B (82) |
| Approximate CO 2 emissions kg/m 2/year | 483 | 239 | 157 | 111 |
| Percentage CO 2 improvement | - | 51% | 68% | 76% |
| Case study HTT-12E: System built steel frame semi-detached house (BISF - 3 bed - 1930-49) (89m 2) | ||||
|---|---|---|---|---|
| Fuel type: Electricity | ||||
| Baseline annual fuel costs: £2,108 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | No insulation | 250mm at joists (£500) |
- | - |
| Windows | 100% single glazing | 100% double glazing (post 2003) (£3,700) |
- | - |
| Open chimneys | None | - | - | - |
| Heating system | Old (large volume) storage heaters | Fan storage heaters (£1,050) |
- | - |
| Heating system controls | Manual charge control | Automatic charge control (included in storage heating costs) | - | - |
| Hot water system | Electric immersion with 25mm factory applied foam | Electric immersion with 80mm factory applied foam (included in storage heating costs) | - | - |
| Secondary space heating | Electric room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £5,265 | £10,765 | £19,965 |
| Annual fuel cost savings | - | £905 | £1,360 | £1,418 |
| Percentage annual fuel cost savings | - | 43% | 65% | 67% |
| SAP Rating | F (23) | E (53) | C (71) | C (78) |
| EI Rating | G (8) | F (30) | E (51) | D (59) |
| Approximate CO 2 emissions kg/m 2/year | 970 | 576 | 345 | 291 |
| Percentage CO 2 improvement | - | 39% | 64% | 69% |
| Case study HTT-12G: System built steel frame semi-detached house (BISF - 3 bed - 1930-49) (89m 2) | ||||
| Fuel type: Gas | ||||
| Baseline annual fuel costs: £1,653 | ||||
| Energy Efficiency Measure | Baseline: 1990 | SHQS 2015 | Further Measures 2020 | Advanced Measures 2050 |
| Walls | No insulation | - | 100mm external insulation (£5,500) |
- |
| Floor | No insulation | - | - | Insulation (£1,200) |
| Roof | No insulation | 100mm at joists (£500) |
250mm at joists (£283) |
- |
| Windows | 100% single glazing | 100% double glazing (pre 2003) (£3,700) |
- | 100% double glazing (post 2003) (£3,700) |
| Open chimneys | None | - | - | - |
| Heating system | Full central heating, boiler efficiency 66% | - | Full central heating, boiler efficiency 90% (condensing combi) (£2,500) |
- |
| Heating system controls | Programmer | - | Time and temperature zone controls (£300) |
- |
| Hot water system | Cylinder thermostat with 25mm factory applied foam | - | - | - |
| Secondary space heating | Gas room heater | - | - | - |
| Ventilation | natural | - | - | - |
| Low energy lighting | None | 100% (£18) |
- | - |
| Solar PVs | None | - | - | 20% of roof area (£8,000) |
| Total cost of all measures applied since baseline | - | £7,018 | £12,801 | £25,701 |
| Annual fuel cost savings | - | £761 | £1,014 | £1,086 |
| Percentage annual fuel cost savings | - | 46% | 61% | 66% |
| SAP Rating | F (33) | D (63) | C (74) | B (81) |
| EI Rating | F (31) | D (60) | C (74) | B (82) |
| Approximate CO 2 emissions kg/m 2/year | 506 | 254 | 165 | 118 |
| Percentage CO 2 improvement | - | 49% | 68% | 77% |
Contact
Email: Agnes Meany
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