Heat in buildings - multiple ownership mixed use buildings: energy retrofit possibilities
Scotland has many buildings which have multiple owners and mixed uses. This report categorises those buildings further and identifies potential solutions to decarbonise their heat supply and improve energy efficiency, in line with the heat in buildings strategy.
7. Detailed Cost Tables - Appendix
7.1. Terraced flats
| Upgrade | Criteria and constraints | Cost (£) | ||
|---|---|---|---|---|
| Pre-1919 | 1919-1991 | Post-1992 | ||
| Fabric upgrades | ||||
| Individual dwelling measures | ||||
| Loft insulation | For top floor only Usually top up Much more expensive if room-in-roof or flat roof |
775 | 604 | |
| Internal wall insulation | Typically for pre-1919 Could be added to CWI Could be instead of CWI |
6,424 | 4,442 | |
| Floor insulation | Ground floor only Suspended floor to 1983 More expensive for solid floor |
4,281 | 2,956 | |
| Replacement windows | More expensive in conservation areas Secondary glazing may be cheaper in conservation areas Single glazing more common in older buildings Replacement of poor DG possible at any age |
3,740 | 3,267 | 3,386 |
| Replacement external doors | More expensive in conservation areas | 600 | 600 | 600 |
| General draught-proofing / air tightness | 112 | 75 | 84 | |
| Individual dwellings subtotal | Without wall insulation | 5,226 - 8,732 | 4,546 - 6,898 | 4,071 - 4,071 |
| With wall insulation | 11,650 - 15,157 | 8,988 - 11,340 | 4,071 - 4,071 | |
| Communal measures | ||||
| Cavity wall insulation | Jointly with other floors Typically for 1919 to 1983 |
426 | ||
| External wall insulation | Jointly with other floor Typically for pre-1919 Could be added to CWI Not for conservation areas |
10245 | 8224 | |
| Communal fabric subtotal | With wall insulation | 15,471 - 18,977 | 4,973 - 15,123 | 4,071 |
| Heating system upgrades | ||||
| Heating system size (kW) | 3.9 | 2.4 | 3.2 | |
| Individual dwelling measures | ||||
| Standard ASHP | Property 2 floors max Consent for external units |
6,000 - 10,000 | 6,000 - 10,000 | 6,000 - 10,000 |
| Internal ASHP/Hybrid | Airing cupboard by external wall | 6,000 - 10,000 | 6,000 - 10,000 | 6,000 - 10,000 |
| Direct electric heating | External space | 4,000 | 4,000 | 4,000 |
| Smart storage heaters | 7,028 | 4,749 | 5,324 | |
| Individual dwelling measures only totals | Without wall insulation | 9,226 - 18,732 | 8,546 - 16,898 | 8,071 - 14,071 |
| With wall insulation | 15,650 - 25,157 | 12,988 - 21,340 | 8,071 - 14,071 | |
| Overall range | All measures | 15,650 - 28,977 | 12,973 - 25,123 | 8,071 - 14,071 |
7.2. Four-in-a-block
| Upgrade | Criteria and constraints | Cost (£) | ||
|---|---|---|---|---|
| Pre-1919 | 1919-1991 | Post-1992 | ||
| Fabric upgrades | ||||
| Individual dwelling measures | ||||
| Loft insulation | For top floor only Usually top up Much more expensive if room-in-roof or flat roof |
712 | 581 | |
| Internal wall insulation | Typically for pre-1919 Could be added to CWI Could be instead of CWI |
11,285 | 8,192 | |
| Floor insulation | Ground floor only Suspended floor to 1983 More expensive for solid floor |
3,790 | 2,777 | |
| Replacement windows | More expensive in conservation areas Secondary glazing may be cheaper in conservation areas Single glazing more common in older buildings Replacement of poor DG possible at any age |
4,902 | 4,163 | 4,164 |
| Replacement external doors | More expensive in conservation areas | 1,200 | 1,200 | 1,200 |
| General draught-proofing / air tightness | 200 | 144 | 144 | |
| Individual dwellings subtotal | Without wall insulation | 7,013 – 10,092 | 6,088 – 8,284 | 5,507 |
| With wall insulation | 18,298 – 21,377 | 14,279 – 16,475 | 5,507 | |
| Communal measures | ||||
| Cavity wall insulation | Jointly with other floors Typically for 1919 to 1983 |
813 | ||
| External wall insulation | Jointly with other floor Typically for pre-1919 Could be added to CWI Not for conservation areas |
15,200 | 12,046 | |
| Communal fabric subtotal | With wall insulation | 22,213 – 25,292 | 6,901 – 20,330 | 5,507 |
| Heating system upgrades | ||||
| Heating system size (kW) | 3.5 | 2.2 | 2.8 | |
| Individual dwelling measures | ||||
| Standard ASHP | Property 2 floors max Consent for external units |
6,000 – 10,000 | 6,000 – 10,000 | 6,000 – 10,000 |
| Internal ASHP/Hybrid | Airing cupboard by external wall | 6,000 – 10,000 | 6,000 – 10,000 | 6,000 – 10,000 |
| Direct electric heating | External space | 4,000 | 4,000 | 4,000 |
| Smart storage heaters | 6,185 | 4,441 | 4,444 | |
| Individual dwelling measures only totals | Without wall insulation | 11,013 – 20,092 | 10,088 – 18,284 | 9,507 – 15,507 |
| With wall insulation | 22,298 – 31,377 | 18,279 – 26,475 | 9,507 – 15,507 | |
| Overall range | With wall insulation | 22,298 – 35,292 | 14,901 – 30,330 | 9,507 – 15,507 |
7.3. Low/high-rise flats (no tower blocks)
| Upgrade | Criteria and constraints | Cost (£) | ||
|---|---|---|---|---|
| Pre-1919 | 1919-1991 | Post-1992 | ||
| Fabric upgrades | ||||
| Individual dwelling measures | ||||
| Loft insulation | For top floor only Usually top up Much more expensive if room-in-roof or flat roof |
605 | 561 | |
| Internal wall insulation | Typically for pre-1919 Could be added to CWI Could be instead of CWI |
5,262 | 6,139 | |
| Floor insulation | Ground floor only Suspended floor to 1983 More expensive for solid floor |
2,959 | 2,615 | |
| Replacement windows | More expensive in conservation areas Secondary glazing may be cheaper in conservation areas Single glazing more common in older buildings Replacement of poor DG possible at any age |
3,463 | 3,672 | 4,048 |
| General draught-proofing / air tightness | 90 | 106 | 135 | |
| Individual dwellings subtotal | Without wall insulation | 4,158 – 6,512 | 4,339 – 6,393 | 4,183 |
| With wall insulation | 9,420 – 11,775 | 10,478 – 12,532 | 4,183 | |
| Communal measures | ||||
| Cavity wall insulation | Jointly with other floors Typically for 1919 to 1983 |
602 | ||
| External wall insulation | Jointly with other floor Typically for pre-1919 Could be added to CWI Not for conservation areas |
9,061 | 9,955 | |
| Communal fabric subtotal | With wall insulation | 13,219 – 15,573 | 4,941 – 16,348 | 4,183 |
| Heating system upgrades | ||||
| Heating system size (kW) | 2.5 | 2.1 | 2.6 | |
| Individual dwelling measures | ||||
| Internal ASHP/Hybrid | Airing cupboard by external wall | 6,000 – 10,000 | 6,000 – 10,000 | 6,000 – 10,000 |
| Direct electric heating | External space | 4,000 | 4,000 | 4,000 |
| Smart storage heaters | 4,755 | 4,161 | 4,648 | |
| Individual dwelling measures only totals | Without wall insulation | 8,158 – 16,512 | 8,339 – 16,393 | 8,183 – 14,183 |
| With wall insulation | 13,420 – 21,775 | 14,478 – 22,532 | 8,183 – 14,183 | |
| Communal heating system | ||||
| Communal ASHP | 8,000 – 10,000 | 8,000 – 10,000 | 8,000 – 10,000 | |
| Communal total | With wall insulation | 21,219 – 25,573 | 12,941 – 26,348 | 12,183 – 14,183 |
| Overall range | With wall insulation | 13,420 – 25,573 | 12,941 – 26,348 | 8,183 – 14,183 |
7.4. Tower blocks
| Upgrade | Criteria and constraints | Cost (£) | ||
|---|---|---|---|---|
| Pre-1919 | 1919-1991 | Post-1992 | ||
| Fabric upgrades | ||||
| Individual dwelling measures | ||||
| Loft insulation | For top floor only Usually top up Much more expensive if room-in-roof or flat roof |
584 | ||
| Internal wall insulation | Typically for pre-1919 Could be added to CWI Could be instead of CWI |
5,532 | ||
| Floor insulation | Ground floor only Suspended floor to 1983 More expensive for solid floor |
2,797 | ||
| Replacement windows | More expensive in conservation areas Secondary glazing may be cheaper in conservation areas Single glazing more common in older buildings Replacement of poor DG possible at any age |
3,527 | 3,971 | |
| General draught-proofing / air tightness | 95 | 129 | ||
| Individual dwellings subtotal | Without wall insulation | 4,206 – 6,419 | 4,100 | |
| With wall insulation | 9,738 – 11,951 | 4,100 | ||
| Communal measures | ||||
| External wall insulation | Jointly with other floor (at least) Typically for pre-1919 Could be added to CWI Not for conservation areas |
9,335 | ||
| Communal fabric subtotal | With wall insulation | 13,542 – 15,755 | 4,100 – 4,100 | |
| Heating system upgrades | ||||
| Heating system size (kW) | 1.9 | 2.6 | ||
| Individual dwelling measures | ||||
| Internal ASHP/Hybrid | Airing cupboard by external wall | 6,000 – 10,000 | 6,000 – 10,000 | |
| Direct electric heating | External space | 4,000 | 4,000 | |
| Smart storage heaters | 4,475 | 6,067 | ||
| Individual dwelling measures only totals | Without wall insulation | 8,206 – 16,419 | 8,100 – 14,100 | |
| With wall insulation | 13,738 – 21,951 | 8,100 – 14,100 | ||
| Communal measures | ||||
| Communal ASHP | 8,000 – 10,000 | 8,000 – 10,000 | ||
| Communal total | With wall insulation | 21,542 – 25,755 | 12,100 – 14,100 | |
| Overall range | With wall insulation | 13,738 – 25,755 | 8,100 – 14,100 | |
Contact
Email: leeanne.mullan@gov.scot
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