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

Table 10: Upgrade costs for 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

Table 11: Upgrade costs for four-in-a-block 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

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)

Table 12: Upgrade costs for non-tower block low/high-rise 'flats.' Note: Pre-1919 properties of this type are generally the typical tenements
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

Table 13: Upgrade costs for tower blocks. It should be noted that there are no ‘tower blocks’ before 1919
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

Back to top