Publication - Research and analysis

Developing regulation of energy efficiency of private sector housing (REEPS): modelling improvements to the target stock - Main Research Report

Published: 5 Nov 2015
Part of:
Research
ISBN:
9781785447730

This report describes how the least energy efficient dwellings in the private sector were identified and how their ratings could be improved by a range of improvement measures. Modelling was used to ascertain the least cost way of reaching different standards, with findings presented on capital costs, fuel cost savings, carbon and energy reductions.

260 page PDF

7.2 MB

260 page PDF

7.2 MB

Contents
Developing regulation of energy efficiency of private sector housing (REEPS): modelling improvements to the target stock - Main Research Report
14 Appendix 8: Additional Tables

260 page PDF

7.2 MB

14 Appendix 8: Additional Tables

Target stock by selected dwelling characteristics

Table A8.1: Summary of private sector dwellings in EPC bands EFG by type

    SAP 2005 SAP 2012
  Sample size % of all dwellings in EFG SAP Band E SAP Band F SAP Band G SAP Band E SAP Band F SAP Band G
Detached 930 45% 126,091
(70%)
44,601
(25%)
10,192
(6%)
88,392
(49%)
74,764
(41%)
17,729
(10%)
Semi-detached 392 23% 80,400
(87%)
9,806
(11%)
2,156
(2%)
59,185
(64%)
29,112
(32%)
4,064
(4%)
Mid-terrace & terrace with passage 75 5% 16,043
(82%)
3,164
(16%)
380
(2%)
9,161
(47%)
9,692
(49%)
734
(4%)
End-terrace 131 8% 25,636
(84%)
4,132
(14%)
714
(2%)
19,346
(63%)
10,138
(33%)
1,098
(4%)
Enclosed end 3 0% 387
(91%)
38
(9%)
0
(0%)
387
(91%)
38
(9%)
0
(0%)
Tenement 159 13% 38,436
(72%)
11,398
(21%)
3,371
(6%)
35,212
(66%)
12,382
(23%)
5,612
(11%)
4-in-a-block 42 2% 8,404
(87%)
1,228
(13%)
0
(0%)
7,643
(79%)
1,989
(21%)
0
(0%)
Tower/slab 10 1% 1,885
(55%)
796
(23%)
724
(21%)
2,287
(67%)
1,117
(33%)
0
(0%)
Flat from converted house 44 3% 8,718
(83%)
1,191
(11%)
658
(6%)
8,328
(79%)
1,800
(17%)
439
(4%)
Total 1786 100% 306,000
(76%)
76,353
(19%)
18,195
(5%)
229,840
(57%)
141,032
(35%)
29,676
(7%)

Table A8.2: Summary of private sector dwellings in EPC bands EFG by dwelling age

    SAP 2005 SAP 2012
  Sample size % of all dwellings in EFG SAP Band E SAP Band F SAP Band G SAP Band E SAP Band F SAP Band G
Pre 1919 746 46% 124,143 (68%) 47,113
(26%)
11,976
(7%)
75,388
(41%)
85,158
(46%)
22,685
(12%)
1919 - 1929 84 4% 13,521
(80%)
2,621
(15%)
904
(5%)
9,760
(57%)
5,312
(31%)
1,975
(12%)
1930 - 1949 227 12% 42,318
(86%)
5,149
(10%)
1,956
(4%)
33,965
(69%)
13,668
(28%)
1,791
(4%)
1950 - 1964 231 12% 41,420
(84%)
6,815
(14%)
895
(2%)
31,228
(64%)
17,250
(35%)
651
(1%)
1965 - 1975 274 14% 47,187
(82%)
8,317
(14%)
2,022
(4%)
38,968
(68%)
16,169
(28%)
2,389
(4%)
1976 - 1983 82 4% 13,045
(84%)
2,250
(15%)
185
(1%)
13,838
(89%)
1,457
(9%)
185
(1%)
1984 - 1991 60 3% 10,080
(83%)
2,016
(17%)
61
(1%)
10,843
(89%)
1,314
(11%)
0
(0%)
1992 - 1998 43 2% 7,750
(90%)
879
(10%)
0
(0%)
8,131
(94%)
498
(6%)
0
(0%)
1999 - 2002 12 1% 1,708
(63%)
996
(37%)
0
(0%)
2,500
(92%)
204
(8%)
0
(0%)
2003 - 2007 20 1% 3,391
(94%)
199
(6%)
0
(0%)
3,590
(100%)
0
(0%)
0
(0%)
2008 onwards 7 0% 1,436
(88%)
0
(0%)
195
(12%)
1,631
(100%)
0
(0%)
0
(0%)
Total 1786 100% 306,000
(76%)
76,353
(19%)
18,195
(5%)
229,840
(57%)
141,032
(35%)
29,676
(7%)

Table A8.3: Summary of private sector dwellings in EPC bands EFG by wall type

    SAP 2005 SAP 2012
  Sample size % of all dwellings in EFG SAP Band E SAP Band F SAP Band G SAP Band E SAP Band F SAP Band G
Solid brick 108 7% 20,947
(78%)
4,996
(19%)
871
(3%)
15,512
(58%)
8,775
(33%)
2,527
(9%)
Cavity brick 664 36% 122,073
(85%)
18,190
(13%)
4,128
(3%)
97,903
(68%)
41,986
(29%)
4,502
(3%)
Sandstone 533 29% 81,645
(71%)
26,827
(23%)
7,147
(6%)
55,251
(48%)
48,620
(42%)
11,748
(10%)
Granite/whinstone 229 17% 45,940
(66%)
18,564
(27%)
4,697
(7%)
25,504
(37%)
33,735
(49%)
9,962
(14%)
Timber 149 6% 20,690
(81%)
4,610
(18%)
256
(1%)
21,784
(85%)
3,772
(15%)
0
(0%)
Cob (earth) 5 0% 445
(71%)
179
(29%)
0
(0%)
583
(94%)
40
(6%)
0
(0%)
System 98 5% 14,259
(78%)
2,986
(16%)
1,097
(6%)
13,304
(73%)
4,102
(22%)
936
(5%)
Total 1786 100% 306,000
(76%)
76,353
(19%)
18,195
(5%)
229,840
(57%)
141,032
(35%)
29,676
(7%)

Table A8.4: Summary of private sector dwellings in EPC bands EFG by main heating type

    SAP 2005 SAP 2012
  Sample size % of all dwellings in EFG SAP Band E SAP Band F SAP Band G SAP Band E SAP Band F SAP Band G
Mains Gas
boiler
615 40% 152,328 (95%) 7,924
(5%)
340
(0%)
123,219
(77%)
36,500
(23%)
872
(1%)
Mains gas
room heater
20 2% 4,625
(73%)
1,710
(27%)
0
(0%)
2,891
(46%)
3,444
(54%)
0
(0%)
Mains gas
warm air
7 0% 1,919
(100%)
0
(0%)
0
(0%)
1,919
(100%)
0
(0%)
0
(0%)
LPG boiler 74 4% 4,382
(26%)
7,589
(45%)
4,880
(29%)
5,589
(33%)
5,904
(35%)
5,358
(32%)
Oil boiler 423 19% 58,829
(76%)
18,726
(24%)
278
(0%)
26,545
(34%)
44,263
(57%)
7,025
(9%)
Oil warm air 2 0% 193
(100%)
0
(0%)
0
(0%)
193
(100%)
0
(0%)
0
(0%)
Solid fuel
boiler
61 3% 5,910
(53%)
4,312
(38%)
1,014
(9%)
4,577
(41%)
5,646
(50%)
1,013
(9%)
Solid fuel
room heater
16 1% 1,027
(30%)
1,616
(47%)
808
(23%)
1,334
(39%)
644
(19%)
1,473
(43%)
Wood
boiler
13 1% 2,089
(78%)
599
(22%)
0
(0%)
1,164
(43%)
965
(36%)
559
(21%)
Wood
room heater
5 0% 149
(12%)
808
(64%)
299
(24%)
0
(0%)
339
(27%)
918
(73%)
Electric peak
boiler
13 1% 448
(12%)
2,272
(59%)
1,102
(29%)
1,465
(38%)
1,255
(33%)
1,102
(29%)
Electric peak
room heater
86 6% 8,419
(33%)
9,766
(38%)
7,184
(28%)
10,957
(43%)
6,109
(24%)
8,301
(33%)
Electric peak
Heat Pump
1 0% 43
(100%)
0
(0%)
0
(0%)
43
(100%)
0
(0%)
0
(0%)
Off peak Electric boiler 19 1% 3,459
(80%)
888
(20%)
0
(0%)
2,247
(52%)
1,483
(34%)
617
(14%)
Off peak Electric warm air 4 0% 417
(44%)
540
(56%)
0
(0%)
957
(100%)
0
(0%)
0
(0%)
Off peak Electric Heat pump 1 0% 0
(0%)
47
(100%)
0
(0%)
0
(0%)
47
(100%)
0
(0%)
Off Peak Electric storage heating 421 21% 61,009
(74%)
19,557
(24%)
2,291
(3%)
45,986
(55%)
34,434
(42%)
2,438
(3%)
Community Heating 5 0% 756
(100%)
0
(0%)
0
(0%)
756
(100%)
0
(0%)
0
(0%)
Total 1786 100% 306,000
(76%)
76,353
(19%)
18,195
(5%)
229,840
(57%)
141,032
(35%)
29,676
(7%)

Additional tables on individual measures

Table A8.5 Number of measures modelled (possible to implement) by rurality, tenure and EPC banding.

  Rurality Tenure EPC banding
  Rural Urban Owner-occupied Private Rented G F E
  N %age N %age N %age N %age N %age N %age N %age
M1: Loft Insulation, Including Top Up 130,775 78% 169,894 73% 246,924 76% 53,745 69% 24,892 84% 112,885 80% 162,893 71%
M2: Flat Roof Insulation 24,959 15% 21,659 9% 32,027 10% 14,590 19% 6,084 21% 25,929 18% 14,605 6%
M3: Room In The Roof Insulation 60,737 36% 57,334 25% 99,730 31% 18,342 24% 9,834 33% 64,211 46% 44,026 19%
M4: Cavity Wall Insulation 67,672 41% 114,625 49% 153,311 47% 28,986 37% 12,444 42% 71,904 51% 97,948 43%
M5: Solid Wall Insulation 107,781 65% 121,980 52% 175,795 54% 53,967 69% 24,937 84% 97,847 69% 106,978 47%
M6: Floor Insulation 159,008 95% 185,764 80% 290,077 90% 54,695 70% 25,918 87% 129,819 92% 189,034 82%
M7: Double Glazing To 1.8 38,095 23% 65,425 28% 73,642 23% 29,878 38% 13,567 46% 48,066 34% 41,887 18%
M8: Secondary Glazing To 2.4 37,212 22% 62,058 27% 71,970 22% 27,300 35% 9,928 33% 48,804 35% 40,538 18%
M9: Triple Glazing To 1.4 136,825 82% 177,913 76% 247,054 77% 67,684 87% 26,667 90% 118,889 84% 169,183 74%
M10: Insulated External Doors 165,332 99% 232,024 99% 320,235 99% 77,121 99% 29,459 99% 140,957 100% 226,940 99%
M11: Hot Water Tank Jacket 80Mm 85,771 51% 130,311 56% 171,920 53% 44,162 57% 19,437 65% 83,709 59% 112,937 49%
M12: Draughtproof windows & doors 137,864 83% 178,210 76% 249,715 77% 66,358 85% 26,667 90% 119,461 85% 169,945 74%
M13: Baffle / Damper To Open Fire 100,242 60% 81,466 35% 148,504 46% 33,204 43% 11,456 39% 83,408 59% 86,843 38%
M14: Replace Gas Boiler With Condensing Boiler 88% 16,101 10% 125,758 54% 125,057 39% 16,803 22% 872 3% 32,369 23% 108,618 47%
M15: Replace Oil/LPG Boiler to 90% 66,033 40% 5,483 2% 55,337 17% 16,178 21% 10,696 36% 41,652 30% 19,168 8%
M16: Full Gas CH System inc controls 1,889 1% 12,485 5% 8,922 3% 5,452 7% 1,417 5% 5,049 4% 7,908 3%
M17: Full Oil/LPG CH System inc Controls 7,691 5% 581 0% 4,877 2% 3,396 4% 3,001 10% 4,671 3% 601 0%
M18: Full Biomass Central Heating System Inc Controls 13,008 8% 1,972 1% 9,848 3% 5,132 7% 3,709 12% 7,239 5% 4,031 2%
M19: Fan Elec Storage Heaters With Auto Charge Control 47,056 28% 68,145 29% 83,136 26% 32,065 41% 14,589 49% 41,898 30% 58,715 26%
M20: Quantum Storage Heaters 48,651 29% 70,783 30% 85,789 27% 33,645 43% 14,589 49% 43,863 31% 60,983 27%
M21: Full Elec Radiator System Inc Controls - Off Peak 339 0% 2,074 1% 1,257 0% 1,155 1% 0 0% 1,572 1% 840 0%
M22: Air Source Heat Pump 5,594 3% 5,291 2% 8,568 3% 2,318 3% 3,034 10% 5,561 4% 2,291 1%
M23: Ground Source Heat Pump 7,529 5% 3,271 1% 7,417 2% 3,383 4% 2,921 10% 5,156 4% 2,722 1%
M24: Room Thermostat 67,227 40% 80,159 34% 124,133 38% 23,253 30% 11,140 38% 47,932 34% 88,314 38%
M25: Programmer For Heating System 4,070 2% 2,131 1% 3,053 1% 3,148 4% 775 3% 3,899 3% 1,527 1%
M26: Trvs 15,911 10% 41,189 18% 49,813 15% 7,288 9% 5,494 19% 19,018 13% 32,588 14%
M27: Full Controls Package 12,477 7% 3,228 1% 10,748 3% 4,956 6% 3,889 13% 7,813 6% 4,004 2%
M28: Auto Charge Control 11,547 7% 18,084 8% 22,876 7% 6,755 9% 1,203 4% 11,787 8% 16,641 7%
M29: Solar Thermal 4m2 119,468 72% 127,200 54% 202,969 63% 43,698 56% 19,318 65% 102,014 72% 125,335 55%
M30: Pv 2Kwp 122,627 73% 133,047 57% 210,219 65% 45,455 58% 19,318 65% 104,326 74% 132,030 57%
M31: 2M Diameter Wind Turbine On Roof 161,270 97% 185,038 79% 291,220 90% 55,087 71% 25,630 86% 127,771 91% 192,907 84%
M32: 5M Wind Turbine On Stand-Alone Mast 160,023 96% 166,228 71% 276,403 86% 49,849 64% 23,769 80% 124,327 88% 178,156 78%
M33: Low Energy Lighting 100% 140,075 84% 215,967 92% 288,755 89% 67,287 87% 25,373 85% 120,698 86% 209,972 91%
M34: Cylinder Stat for HW Cylinder 34,058 20% 23,189 10% 47,290 15% 9,957 13% 6,883 23% 28,812 20% 21,553 9%
M35: Air To Air Heat Pump 44,038 26% 66,925 29% 78,723 24% 32,240 41% 11,639 39% 41,201 29% 58,124 25%
M36: Replace Secondary Heating With One More Efficient 61,424 37% 35,133 15% 74,075 23% 22,482 29% 11,232 38% 53,359 38% 31,966 14%
M37: Elec CPSU With Radiators And Controls On E18 Tariff 1,941 1% 0 0% 1,620 1% 321 0% 1,941 7% 0 0% 0 0%
M38: Switch Electricity Tariff 14,621 9% 24,093 10% 29,534 9% 9,181 12% 2,340 8% 7,577 5% 28,796 13%

Table A8.6 Summary of individual measures

Mean change in SAP Mean change in annual fuel costs Mean change in CO2e Mean change in Primary Energy Mean change in Delivered Energy Mean capital costs Cost per SAP point increase Cost per fuel savings (pay back) CO2e saved per £ PE saved per £ DE saved per £ Dwellings modelled
M11: Hot Water Tank Jacket 80Mm 1.2 £31 159 790 425 £23 £19 1 7.1 35.1 18.9 216,082
M33: Low Energy Lighting 100% 1.0 £29 94 630 109 £32 £33 1 2.9 19.5 3.4 356,043
M38: Switch Electricity Tariff 5.6 £148 257 1,628 469 £200 £36 1 1.3 8.1 2.3 38,714
M1: Loft Insulation, inc Top Up 5.3 £165 1,003 5,143 3,587 £350 £66 2 2.9 14.7 10.3 300,669
M26: Trvs 2.4 £82 508 2,432 2,030 £175 £74 2 2.9 13.9 11.6 57,100
M27: Full Controls Package 4.1 £187 1,067 4,116 3,501 £402 £97 2 2.7 10.2 8.7 15,705
M24: Room Thermostat 2.4 £79 444 2,246 1,767 £200 £85 3 2.2 11.2 8.8 147,386
M36: Replace Secondary Heating With One More Efficient 5.2 £185 1,485 5,346 4,476 £481 £93 3 3.1 11.1 9.3 96,558
M13: Baffle / Damper To Open Fire .9 £29 187 916 634 £85 £94 3 2.2 10.8 7.5 181,708
M34: Cylinder Stat For Hot Water Cylinder 2.1 £69 373 1,801 1,557 £300 £146 4 1.2 6.0 5.2 57,247
M3: Room In The Roof Insulation 13.0 £454 2,778 13,767 10,266 £2,100 £162 5 1.3 6.6 4.9 118,072
M19: Fan Elec Storage Heaters With Auto Charge Control 8.3 £220 85 -538 695 £1,180 £142 5 .1 -.5 .6 115,201
M4: Cavity Wall Insulation 6.6 £183 1,160 5,812 3,934 £1,000 £153 5 1.2 5.8 3.9 182,296
M28: Auto Charge Control 1.2 £34 259 1,512 506 £200 £173 6 1.3 7.6 2.5 29,631
M20: Quantum Storage Heaters 14.0 £359 1,263 6,243 2,997 £2,380 £170 7 .5 2.6 1.3 119,434
M12: Draughtproof Windows And Doors .5 £15 89 479 313 £100 £216 7 .9 4.8 3.1 316,074
M37: Elec CPSU With Radiators And Controls On E18 Tariff 17.0 £569 -3,537 -29,226 6,442 £5,000 £294 9 -.7 -5.8 1.3 1,941
M16: Full Gas Central Heating System Inc Controls 26.2 £565 2,782 16,247 1,937 £5,000 £191 9 .6 3.2 .4 14,374
M15: Replace Oil/LPG Boiler to 90% 7.4 £286 1,401 5,496 4,815 £2,600 £350 9 .5 2.1 1.9 71,515
M17: Full Oil/LPG Central Heating System Inc Controls 15.1 £466 2,844 17,016 17,679 £5,000 £332 11 .6 3.4 3.5 8,273
M14: Replace Gas Boiler With Condensing Boiler 88% 8.3 £236 1,483 8,243 6,760 £2,600 £313 11 .6 3.2 2.6 141,859
M21: Full Elec Radiator System Inc Controls - Off Peak 10.3 £227 169 1,001 330 £2,600 £252 11 .1 .4 .1 2,412
M6: Floor Insulation 2.8 £87 542 2,736 1,754 £1,000 £351 11 .5 2.7 1.8 344,772
M2: Flat Roof Insulation 2.8 £87 577 2,770 1,750 £1,175 £413 14 .5 2.4 1.5 46,617
M35: Air To Air Heat Pump 11.9 £297 3,747 20,942 7,901 £4,500 £377 15 .8 4.7 1.8 110,963
M8: Secondary Glazing To 2.4 2.3 £79 452 2,281 1,674 £1,250 £545 16 .4 1.8 1.3 99,270
M25: Programmer For Heating System .2 £11 3,402 17,407 10,516 £200 £958 18 .3 1.9 1.6 10,886
M22: Air Source Heat Pump 14.2 £444 69 388 318 £8,000 £564 18 .4 2.2 1.3 6,201
M23: Ground Source Heat Pump 19.2 £545 4,623 20,481 24,976 £13,000 £677 24 .4 1.6 1.9 10,800
M18: Full Biomass Central Heating System Inc Controls 11.3 £367 7,367 10,942 14,730 £10,000 £884 27 .7 1.1 1.5 14,979
M5: Solid Wall Insulation 9.6 £307 1,894 9,318 6,644 £9,000 £935 29 .2 1.0 .7 229,762
M10: Insulated External Doors .9 £26 162 846 514 £908 £998 35 .2 .9 .6 397,356
M32: 5M Wind Turbine On Stand-Alone Mast 14.9 £419 1,629 9,636 3,139 £20,000 £1,343 48 .1 .5 .2 326,251
M31: 2M Diameter Wind Turbine On Roof 1.7 £50 193 1,144 373 £2,750 £1,639 55 .1 .4 .1 346,307
M29: Solar Thermal 4M2 2.9 £88 444 2,205 1,580 £5,000 £1,712 57 .1 .4 .3 246,667
M7: Double Glazing To 1.8 2.4 £84 478 2,399 1,718 £4,900 £2,002 58 .1 .5 .4 103,520
M30: Pv 2Kwp 6.4 £181 710 4,197 1,367 £11,500 £1,808 63 .1 .4 .1 255,674
M9: Triple Glazing To 1.4 2.0 £61 374 1,924 1,238 £7,500 £3,814 123 .0 .3 .2 314,738

Table A8.7: Measures included in packages for each scenario by tenure (Scenarios 1 to 4).

  Scenario 1 Scenario 2 Scenario 3 Scenario 4
  All dwellings to reach Band F All dwellings to reach Band E All dwellings to reach Band D ALL dwellings to improve 1 band
  OO PRS OO PRS OO PRS OO PRS
  % Total % Total % Total % Total % Total % Total % Total % Total
Base (Total dwellings improved)   17,776   11,900   128,680   42,028   322,838   77,710   322,838   77,710
M1: Loft Insulation, Including Top Up 57% 10,074 70% 8,301 41% 52,174 53% 22,195 39% 125,049 41% 32,207 32% 104,870 37% 28,510
M2: Flat Roof Insulation 0% 0 0% 0 1% 1,010 1% 570 2% 6,231 1% 1,129 1% 3,445 1% 612
M3: Room In The Roof Insulation 0% 0 0% 0 8% 10,602 15% 6,212 18% 56,965 18% 14,110 5% 15,770 4% 2,952
M4: Cavity Wall Insulation 11% 2,009 5% 641 15% 19,860 11% 4,751 26% 82,685 26% 20,565 17% 56,317 10% 7,533
M5: Solid Wall Insulation 0% 0 0% 0 1% 910 1% 271 7% 21,198 11% 8,362 1% 3,076 1% 462
M6: Floor Insulation 8% 1,410 2% 222 6% 7,346 5% 1,917 21% 67,205 27% 20,601 9% 29,303 7% 5,679
M7: Double Glazing To 1.8 0% 0 0% 0 0% 0 0% 0 1% 2,113 1% 588 0% 0 0% 0
M8: Secondary Glazing To 2.4 0% 0 0% 0 0% 208 1% 230 1% 3,473 4% 3,031 1% 1,630 1% 618
M10: Insulated External Doors 0% 0 0% 0 1% 1,334 1% 270 3% 8,978 3% 2,218 2% 5,129 2% 1,387
M11: Hot Water Tank Jacket 80Mm 15% 2,639 17% 2,012 14% 17,474 10% 4,309 22% 70,013 23% 18,166 16% 51,520 14% 10,887
M12: Draughtproof Windows And Doors 0% 0 0% 0 4% 5,575 5% 1,918 5% 15,660 6% 4,614 3% 9,864 5% 3,754
M13: Baffle / Damper To Open Fire 0% 0 0% 0 3% 3,442 5% 1,970 6% 19,872 3% 2,343 5% 15,986 4% 3,183
M14: Replace With Conden Boiler 88% 0% 0 0% 0 3% 3,925 1% 595 8% 24,494 2% 1,434 4% 11,867 1% 783
M15: Replace Oil/LPG Boiler to 90% 4% 769 2% 234 6% 8,306 4% 1,740 7% 21,912 9% 6,654 2% 8,004 2% 1,726
M16: Full Gas CH System Inc Controls 0% 0 0% 0 0% 0 0% 0 0% 1,509 0% 195 0% 0 0% 0
M17: Full Oil/LPG CH System Inc Controls 0% 39 0% 37 1% 1,285 1% 517 1% 3,015 3% 2,297 0% 742 0% 37
M18: Full Biomass CH System Inc Con 0% 0 0% 0 0% 0 0% 41 0% 0 0% 41 0% 0 0% 0
M19: Fan Elec Storage H With ACC 11% 1,905 8% 973 8% 10,769 14% 5,772 4% 13,178 8% 6,033 3% 9,493 8% 5,849
M20: Quantum Storage Heaters 0% 0 0% 0 3% 3,881 9% 3,799 8% 26,082 17% 13,209 3% 8,860 6% 4,824
M24: Room Thermostat 18% 3,135 11% 1,322 7% 9,532 8% 3,466 15% 49,314 12% 9,049 11% 36,919 6% 4,833
M26: TRVs 5% 943 2% 181 1% 1,713 3% 1,268 6% 20,905 5% 3,959 5% 15,216 4% 3,154
M27: Full Controls Package 0% 0 0% 0 2% 3,214 1% 312 1% 3,756 1% 1,061 1% 2,681 0% 312
M28: Auto Charge Control 0% 0 0% 0 1% 1,490 1% 534 1% 3,975 1% 963 2% 5,465 1% 982
M29: Solar Thermal 4m2 0% 0 0% 0 0% 0 0% 0 1% 3,123 0% 222 0% 0 0% 0
M31: 2m Wind Turbine on Roof 0% 0 0% 0 0% 0 0% 0 0% 495 1% 791 0% 495 1% 791
M33: Low Energy Lighting 100% 4% 718 2% 231 17% 21,770 9% 3,726 35% 111,908 31% 23,754 27% 86,946 18% 14,364
M34: Cylinder Stat For HW Cylinder 4% 708 0% 0 2% 2,791 0% 0 4% 14,257 4% 3,032 3% 9,418 1% 632
M36: Replace Sec Heating 11% 2,014 4% 523 12% 15,439 15% 6,262 17% 53,911 21% 16,362 10% 31,470 9% 6,742
M38: Switch Electricity Tariff 1% 185 4% 426 1% 1,668 3% 1,210 3% 9,736 5% 3,664 3% 11,087 6% 4,951

Table A8.8: Measures included in package for each scenario by base EPC band (Scenarios 2 to 4).

  Scenario 2 Scenario 3 Scenario 4
  All dwellings to reach Band E All dwellings to reach Band D ALL EFG dwellings to improve one band
  From G From F From G From F From E G to F F to E E to D
  % Total % Total % Total % Total % Total % Total % Total % Total
Base (Total dwellings improved)   29,676   141,032   29,676   141,032   229,840   29,676   141,032   229,840
M1: Loft Insulation, Including Top Up 63% 18,560 40% 55,808 67% 19,920 55% 78,139 26% 59,196 62% 18,375 40% 55,808 40% 90,951
M2: Flat Roof Insulation 0% 0 1% 1,579 0% 0 3% 4,882 1% 2,478 0% 0 1% 1,579 1% 2,574
M3: Room In The Roof Insulation 33% 9,702 5% 7,112 32% 9,535 35% 49,930 5% 11,610 0% 0 5% 7,112 5% 11,591
M4: Cavity Wall Insulation 14% 4,142 15% 20,469 35% 10,531 37% 51,988 18% 40,731 9% 2,649 15% 20,469 15% 33,359
M5: Solid Wall Insulation 4% 1,181 0% 0 35% 10,275 11% 15,748 2% 3,538 0% 0 0% 0 0% 0
M6: Floor Insulation 9% 2,646 5% 6,617 63% 18,722 30% 42,350 12% 26,734 5% 1,632 5% 6,617 5% 10,783
M7: Double Glazing To 1.8 0% 0 0% 0 9% 2,701 0% 0 0% 0 0% 0 0% 0 0% 0
M8: Secondary Glazing To 2.4 1% 208 0% 230 8% 2,343 2% 2,142 1% 2,018 0% 0 0% 230 0% 375
M10: Insulated External Doors 0% 0 1% 1,604 8% 2,476 3% 3,808 2% 4,912 0% 0 1% 1,604 1% 2,614
M11: Hot Water Tank Jacket 80Mm 22% 6,433 11% 15,351 29% 8,495 26% 37,280 18% 42,404 16% 4,651 11% 15,351 11% 25,017
M12: Draughtproof Winds & Doors 7% 1,941 4% 5,551 4% 1,194 8% 11,014 4% 8,067 0% 0 4% 5,551 4% 9,047
M13: Baffle / Damper To Open Fire 0% 0 4% 5,412 4% 1,068 5% 7,390 6% 13,757 0% 0 4% 5,412 4% 8,820
M14: Replace with Cond Boiler 88% 3% 872 3% 3,648 3% 872 11% 16,053 4% 9,003 0% 0 3% 3,648 3% 5,944
M15: Replace Oil/LPG Boiler to 90% 18% 5,424 3% 4,622 21% 6,124 13% 18,336 2% 4,106 3% 1,002 3% 4,622 3% 7,532
M16: Full Gas CH System Inc Controls 0% 0 0% 0 2% 702 1% 1,002 0% 0 0% 0 0% 0 0% 0
M17: Full Oil/LPG CH System Inc Controls 4% 1,099 0% 704 9% 2,784 2% 2,528 0% 0 0% 76 0% 704 0% 1,147
M18: Full Biomass CH System Inc Con 0% 41 0% 0 0% 41 0% 0 0% 0 0% 0 0% 0 0% 0
M19: Fan Elec Storage H With ACC 34% 10,105 5% 6,436 6% 1,817 8% 11,365 3% 6,029 10% 2,878 5% 6,436 5% 10,489
M20: Quantum Storage Heaters 10% 2,850 3% 4,830 41% 12,069 13% 18,368 4% 8,854 0% 0 3% 4,830 3% 7,871
M24: Room Thermostat 15% 4,373 6% 8,626 19% 5,652 17% 24,041 12% 28,670 15% 4,457 6% 8,626 6% 14,057
M26: TRVs 2% 539 2% 2,442 3% 931 6% 9,128 6% 14,805 4% 1,124 2% 2,442 2% 3,979
M27: Full Controls Package 2% 532 2% 2,994 9% 2,575 2% 2,241 0% 0 0% 0 2% 2,994 2% 4,879
M28: Auto Charge Control 0% 0 1% 2,024 0% 0 0% 515 2% 4,424 0% 0 1% 2,024 1% 3,298
M29: Solar Thermal 4m2 0% 0 0% 0 9% 2,612 1% 733 0% 0 0% 0 0% 0 0% 0
M31: 2m Wind Turbine on Roof 0% 0 0% 0 0% 0 0% 0 1% 1,287 0% 0 0% 0 0% 0
M33: Low Energy Lighting 100% 7% 2,181 17% 23,315 49% 14,508 31% 44,108 34% 77,046 3% 949 17% 23,315 17% 37,996
M34: Cylinder Stat For HW Cylinder 3% 827 1% 1,964 4% 1,058 6% 8,851 3% 7,379 2% 708 1% 1,964 1% 3,200
M36: Replace Sec Heating 17% 5,001 12% 16,700 27% 8,133 31% 43,165 8% 18,975 9% 2,537 12% 16,700 12% 27,215
M38: Switch Electricity Tariff 0% 0 2% 2,878 0% 0 1% 851 5% 12,549 2% 611 2% 2,878 2% 4,690

Table A8.9: Measures included in packages for each scenario by rurality (Scenarios 1 to 4).

  Scenario 1 Scenario 2 Scenario 3 Scenario 4
  All dwellings to reach Band F All dwellings to reach Band E All dwellings to reach Band D ALL dwellings to improve one band
  Rural Urban Rural Urban Rural Urban Rural Urban
  %age Total %age Total %age Total %age Total %age Total %age Total %age Total %age Total
Base (Total dwellings improved)   19,910   9,767   100,909   69,799   167,057   233,491   167,057   233,491
M1: Loft Insulation, Including Top Up 64% 12,703 58% 5,672 40% 40,600 48% 33,769 43% 72,050 36% 85,206 37% 61,150 31% 72,230
M2: Flat Roof Insulation 0% 0 0% 0 0% 350 2% 1,229 2% 3,750 2% 3,610 1% 1,553 1% 2,504
M3: Room In The Roof Insulation 0% 0 0% 0 15% 15,240 2% 1,574 28% 46,739 10% 24,337 6% 9,988 4% 8,734
M4: Cavity Wall Insulation 9% 1,756 9% 893 16% 15,844 13% 8,767 28% 46,981 24% 56,269 14% 23,026 17% 40,823
M5: Solid Wall Insulation 0% 0 0% 0 1% 1,181 0% 0 14% 23,160 3% 6,400 1% 2,433 0% 1,105
M6: Floor Insulation 8% 1,632 0% 0 9% 8,761 1% 502 40% 66,675 9% 21,131 15% 24,523 4% 10,460
M7: Double Glazing To 1.8 0% 0 0% 0 0% 0 0% 0 0% 356 1% 2,345 0% 0 0% 0
M8: Secondary Glazing To 2.4 0% 0 0% 0 0% 399 0% 40 2% 3,922 1% 2,582 0% 230 1% 2,018
M10: Insulated External Doors 0% 0 0% 0 2% 1,604 0% 0 5% 7,930 1% 3,265 2% 3,475 1% 3,041
M11: Hot Water Tank Jacket 80Mm 13% 2,626 21% 2,026 11% 11,142 15% 10,642 22% 36,192 22% 51,987 13% 21,385 18% 41,022
M12: Draughtproof Windows And Doors 0% 0 0% 0 4% 4,200 5% 3,292 6% 9,784 4% 10,490 2% 3,550 4% 10,068
M13: Baffle / Damper To Open Fire 0% 0 0% 0 5% 5,049 1% 363 5% 8,755 6% 13,459 5% 7,871 5% 11,298
M14: Replace With Conden Boiler 88% 0% 0 0% 0 1% 1,406 4% 3,113 3% 5,051 9% 20,877 1% 2,068 5% 10,582
M15: Replace Oil/LPG Boiler to 90% 5% 1,002 0% 0 9% 9,369 1% 678 16% 26,364 1% 2,203 5% 8,942 0% 788
M16: Full Gas CH System Inc Controls 0% 0 0% 0 0% 0 0% 0 0% 507 1% 1,197 0% 0 0% 0
M17: Full Oil/LPG CH System Inc Controls 0% 76 0% 0 2% 1,613 0% 190 3% 4,768 0% 544 0% 590 0% 190
M18: Full Biomass CH System Inc Con 0% 0 0% 0 0% 41 0% 0 0% 41 0% 0 0% 0 0% 0
M19: Fan Elec Storage H With ACC 1% 187 28% 2,690 6% 6,510 14% 10,031 3% 5,417 6% 13,794 2% 4,076 5% 11,266
M20: Quantum Storage Heaters 0% 0 0% 0 5% 5,250 3% 2,430 13% 20,907 8% 18,384 4% 6,472 3% 7,211
M24: Room Thermostat 22% 4,423 0% 34 10% 10,258 4% 2,740 21% 35,432 10% 22,931 12% 20,211 9% 21,542
M26: TRVs 1% 217 9% 907 1% 1,394 2% 1,586 6% 9,384 7% 15,480 4% 6,295 5% 12,075
M27: Full Controls Package 0% 0 0% 0 3% 2,994 1% 532 2% 3,603 1% 1,214 2% 2,994 0% 0
M28: Auto Charge Control 0% 0 0% 0 0% 173 3% 1,851 1% 2,421 1% 2,518 1% 2,078 2% 4,369
M29: Solar Thermal 4m2 0% 0 0% 0 0% 0 0% 0 2% 2,971 0% 375 0% 0 0% 0
M31: 2m Wind Turbine on Roof 0% 0 0% 0 0% 0 0% 0 0% 0 1% 1,287 0% 0 1% 1,287
M33: Low Energy Lighting 100% 1% 199 8% 750 15% 15,580 14% 9,916 30% 50,940 36% 84,722 20% 33,528 29% 67,782
M34: Cylinder Stat For HW Cylinder 4% 708 0% 0 2% 1,602 2% 1,189 8% 12,807 2% 4,482 4% 6,086 2% 3,964
M36: Replace Sec Heating 13% 2,537 0% 0 17% 17,551 6% 4,149 29% 48,391 9% 21,882 16% 27,042 5% 11,170
M38: Switch Electricity Tariff 1% 185 4% 426 2% 1,841 1% 1,037 3% 5,147 4% 8,253 4% 6,571 4% 9,467

Additional tables on scenarios by turnover rates, tenure, and rurality.

Table A8.10: Progress towards Scenario 1 - all dwellings to reach F - based on estimated turnover rates.

  After
Year 1
After
Year 2
After
Year 3
After
Year 5
After
Year 10
After
Year 20
After
Year 30
All Dwellings
Number of dwellings improved 4,520 6,476 8,104 10,550 14,792 21,554 25,431 29,676
%age carried out 15% 22% 27% 36% 50% 73% 86% 100%
Number carried out among OO 569 907 1,546 2,791 5,582 10,772 14,114 17,776
%age carried out among OO 3% 5% 9% 16% 31% 61% 79% 100%
Number carried out among PRS 3,951 5,569 6,557 7,759 9,211 10,782 11,317 11,900
%age carried out among PRS 33% 47% 55% 65% 77% 91% 95% 100%
Number carried out in rural areas 2,849 4,089 5,153 6,775 9,643 14,277 16,966 19,910
%age carried out in rural areas 14% 21% 26% 34% 48% 72% 85% 100%
Number carried out in urban areas 1,671 2,387 2,951 3,775 5,150 7,277 8,466 9,767
%age carried out in urban areas 17% 24% 30% 39% 53% 75% 87% 100%
Overall capital cost £2.4 m £3.4 m £4.4 m £5.9 m £8.6 m £13.1 m £15.7 m £18.6 m
Overall reduction in annual fuel costs £2.4 m £3.5 m £4.4 m £5.7 m £8.0 m £11.7 m £13.8 m £16.1 m
Overall reduction in annual CO2e (thousand tons) 9.8 k tons 14. k tons 17.4 k tons 22.6 k tons 31.6 k tons 45.7 k tons 53.8 k tons 62.7 k tons
Overall reduction in Delivered Energy (kWh pa) 31.64 m 45.31 m 56.6 m 73.5 m 102.65 m 148.93 m 175.38 m 204.33 m
Overall reduction in Primary Energy (kWh pa) 48.14 m 68.9 m 85.93 m 111.31 m 154.89 m 223.8 m 263.06 m 306.04 m
Average SAP point increase among improved dwellings 14.7 14.7 14.6 14.4 14.2 13.9 13.8 13.7

Table A8.11: Progress towards Scenario 2 - all dwellings to reach E - based on estimated turnover rates.

  After
Year 1
After
Year 2
After
Year 3
After
Year 5
After
Year 10
After
Year 20
After
Year 30
All Dwellings
Number of dwellings improved 18,071 26,232 34,353 47,605 72,935 116,057 142,140 170,708
%age carried out 11% 15% 20% 28% 43% 68% 83% 100%
Number carried out among OO 4,118 6,563 11,195 20,203 40,405 77,980 102,172 128,680
%age carried out among OO 3% 5% 9% 16% 31% 61% 79% 100%
Number carried out among PRS 13,953 19,669 23,157 27,402 32,530 38,077 39,969 42,028
%age carried out among PRS 33% 47% 55% 65% 77% 91% 95% 100%
Number carried out in rural areas 11,171 16,186 21,063 28,948 43,864 69,093 84,278 100,909
%age carried out in rural areas 11% 16% 21% 29% 43% 68% 84% 100%
Number carried out in urban areas 6,900 10,046 13,289 18,657 29,071 46,964 57,862 69,799
%age carried out in urban areas 10% 14% 19% 27% 42% 67% 83% 100%
Number carried out in EPC Band G 4,520 6,476 8,104 10,550 14,792 21,554 25,431 29,676
%age carried out in EPC Band G 15% 22% 27% 36% 50% 73% 86% 100%
Number carried out in EPC Band F 13,551 19,756 26,249 37,055 58,143 94,503 116,709 141,032
%age carried out in EPC Band F 10% 14% 19% 26% 41% 67% 83% 100%
Overall capital cost £23.8 m £34.4 m £44.7 m £61.2 m £92.2 m £144.5 m £175.9 m £210.2 m
Overall reduction in annual fuel costs £9.2 m £13.3 m £17.2 m £23.4 m £35.0 m £54.5 m £66.2 m £79.0 m
Overall reduction in annual CO2e (thousand tons) 41.9 k tons 60.5 k tons 78.3 k tons 106.7 k tons 160. k tons 249.5 k tons 303. k tons 361.7 k tons
Overall reduction in Delivered Energy (kWh pa) 142 m 206 m 267 m 367 m 555 m 873 m 1064 m 1273 m
Overall reduction in Primary Energy (kWh pa) 197 m 284 m 368 m 501 m 749 m 1166 m 1416 m 1689 m
Average SAP point increase among improved dwellings 15.7 15.6 15.3 14.9 14.3 13.8 13.6 13.4

Table A8.12: Progress towards Scenario 3 - all dwellings to reach D - based on estimated turnover rates.

  After
Year 1
After
Year 2
After
Year 3
After
Year 5
After
Year 10
After
Year 20
After
Year 30
All Dwellings
Number of dwellings improved 39,227 57,205 75,908 107,699 171,407 278,445 344,620 400,548
%age carried out 10% 14% 19% 27% 43% 70% 86% 100%
Number carried out among OO 11,107 18,018 29,058 52,821 107,584 205,542 269,148 322,838
%age carried out among OO 3% 6% 9% 16% 33% 64% 83% 100%
Number carried out among PRS 28,119 39,187 46,850 54,877 63,823 72,903 75,472 77,710
%age carried out among PRS 36% 50% 60% 71% 82% 94% 97% 100%
Number carried out in rural areas 17,379 25,262 33,212 46,441 72,379 115,934 142,597 167,057
%age carried out in rural areas 10% 15% 20% 28% 43% 69% 85% 100%
Number carried out in urban areas 21,847 31,944 42,696 61,257 99,028 162,511 202,023 233,491
%age carried out in urban areas 9% 14% 18% 26% 42% 70% 87% 100%
Number carried out in EPC Band G 4,520 6,476 8,104 10,550 14,792 21,554 25,431 29,676
%age carried out in EPC Band G 15% 22% 27% 36% 50% 73% 86% 100%
Number carried out in EPC Band F 13,551 19,756 26,249 37,055 58,143 94,503 116,709 141,032
%age carried out in EPC Band F 10% 14% 19% 26% 41% 67% 83% 100%
Number carried out in EPC Band E 21,155 30,973 41,555 60,094 98,472 162,388 202,480 229,840
%age carried out in EPC Band E 9% 13% 18% 26% 43% 71% 88% 100%
Overall capital cost £113 m £164 m £215 m £299 m £462 m £737 m £905 m £1070 m
Overall reduction in annual fuel costs £19.7 m £28.6 m £37.7 m £52.8 m £82.4 m £132.4 m £163.0 m £193.0 m
Overall reduction in annual CO2e (thousand tons) 103 k tons 150 k tons 199 k tons 281 k tons 442 k tons 715 k tons 883 k tons 1046 k tons
Overall reduction in Delivered Energy (kWh pa) 340 m 497 m 661 m 939 m 1490 m 2430 m 3008 m 3569 m
Overall reduction in Primary Energy (kWh pa) 497 m 725 m 958 m 1351 m 2127 m 3444 m 4251 m 5030 m
Average SAP point increase among improved dwellings 18.1 18.0 17.7 17.3 16.8 16.4 16.2 16.4

Table A8.13: Progress towards Scenario 4 - all EFG dwellings to move up one band - based on estimated turnover.

  After
Year 1
After
Year 2
After
Year 3
After
Year 5
After
Year 10
After
Year 20
After
Year 30
All Dwellings
Number of dwellings improved 39,227 57,205 75,908 107,699 171,407 278,445 344,620 400,548
%age carried out 10% 14% 19% 27% 43% 70% 86% 100%
Number carried out among OO 11,107 18,018 29,058 52,821 107,584 205,542 269,148 322,838
%age carried out among OO 3% 6% 9% 16% 33% 64% 83% 100%
Number carried out among PRS 28,119 39,187 46,850 54,877 63,823 72,903 75,472 77,710
%age carried out among PRS 36% 50% 60% 71% 82% 94% 97% 100%
Number carried out in rural areas 17,379 25,262 33,212 46,441 72,379 115,934 142,597 167,057
%age carried out in rural areas 10% 15% 20% 28% 43% 69% 85% 100%
Number carried out in urban areas 21,847 31,944 42,696 61,257 99,028 162,511 202,023 233,491
%age carried out in urban areas 9% 14% 18% 26% 42% 70% 87% 100%
Number carried out in EPC Band G 4,520 6,476 8,104 10,550 14,792 21,554 25,431 29,676
%age carried out in EPC Band G 15% 22% 27% 36% 50% 73% 86% 100%
Number carried out in EPC Band F 13,551 19,756 26,249 37,055 58,143 94,503 116,709 141,032
%age carried out in EPC Band F 10% 14% 19% 26% 41% 67% 83% 100%
Number carried out in EPC Band E 21,155 30,973 41,555 60,094 98,472 162,388 202,480 229,840
%age carried out in EPC Band E 9% 13% 18% 26% 43% 71% 88% 100%
Overall capital cost £36 m £53 m £70 m £101 m £163 m £269 m £334 m £388 m
Overall reduction in annual fuel costs £11.1 m £16.2 m £21.4 m £30.2 m £47.7 m £77.1 m £95.3 m £111.6 m
Overall reduction in annual CO2e (thousand tons) 58 k tons 85 k tons 112 k tons 160 k tons 256 k tons 417 k tons 517 k tons 606 k tons
Overall reduction in Delivered Energy (kWh pa) 186 m 272 m 364 m 524 m 849 m 1400 m 1742 m 2044 m
Overall reduction in Primary Energy (kWh pa) 283 m 414 m 550 m 784 m 1254 m 2046 m 2537 m 2968 m
Average SAP point increase among improved dwellings 10.1 10.0 9.9 9.8 9.6 9.4 9.4 9.4

Table A8.14: Scenarios by rurality

  Scenario 1 Scenario 2 Scenario 3 Scenario 4
All dwellings to reach Band F All dwellings to reach Band E All dwellings to reach Band D ALL EFG dwellings to improve one band
Rural Urban Rural Urban Rural Urban Rural Urban
Number of dwellings improved 19,910 9,767 100,909 69,799 167,057 233,491 167,057 233,491
Mean SAP base 12.9 11.2 27.8 29.3 35.4 42.3 35.4 42.3
Mean SAP increase 11.4 18.5 13.2 13.8 20.2 13.8 9.5 9.3
Mean EI score base 24.3 23.6 24.3 24.9 28.9 34.9 28.9 34.9
Mean EI score increase 7.3 8.3 7.5 7.7 14.5 10.1 6.9 6.9
Mean capital cost of improvements £673 £532 £1,523 £811 £4,092 £1,656 £1,166 £828
Overall capital cost of improvements £13.4 m £5.2 m £153.7 m £56.6 m £683.6 m £386.7 m £194.8 m £193.3 m
Banded capital cost: %age (n) £0-£200 17%
(3,330)
6%
(607)
13%
(12,678)
12%
(8,663)
8%
(13,397)
23%
(54,681)
18%
(29,405)
27%
(63,951)
Banded capital cost: %age (n) £201-£500 51%
(10,194)
53%
(5,202)
28%
(28,655)
45%
(31,314)
6%
(9,335)
19%
(43,354)
29%
(47,990)
31%
(73,343)
Banded capital cost: %age (n) £501-£1,000 15%
(2,893)
32%
(3,107)
14%
(13,875)
16%
(11,227)
9%
(14,949)
7%
(15,238)
18%
(30,285)
11%
(26,802)
Banded capital cost: %age (n) £1,001-£2,000 12%
(2,415)
9%
(851)
10%
(10,414)
14%
(10,103)
10%
(17,321)
19%
(45,404)
16%
(26,132)
17%
(39,914)
Banded capital cost: %age (n) £2,001-£5,000 5%
(1,002)
0%
(-)
32%
(32,653)
12%
(8,492)
42%
(69,452)
27%
(63,549)
18%
(30,063)
12%
(28,111)
Banded capital cost: %age (n) £5,001-£10,000 0%
(76)
0%
(-)
2%
(2,160)
0%
(-)
13%
(21,861)
3%
(7,252)
2%
(3,183)
1%
(1,369)
Banded capital cost: %age (n) >£10,000 0%
(-)
0%
(-)
0%
(473)
0%
(-)
12%
(20,743)
2%
(4,013)
0%
(-)
0%
(-)
Mean fuel cost pre improvement £2,653 £2,077 £2,170 £1,907 £1,896 £1,461 £1,896 £1,461
Mean reduction in fuel costs £525 £578 £498 £412 £644 £367 £326 £246
Overall fuel cost pre improvement £52.8m £20.3m £218.9 m £133.1 m £316.7 m £341.2 m £316.7 m £341.2m
Overall reduction in fuel costs £10.5 m £5.6 m £50.2 m £28.7 m £107.6 m £85.4 m £54.5 m £57.1 m
Mean CO2e consumed pre improvement 12,322 kg 8,904 kg 12,166 kg 10,792 kg 10,815 kg 8,248 kg 10,815 kg 8,248 kg
Mean reduction in CO2e consumed 2,366 kg 1,597 kg 2,302 kg 1,854 kg 3,488 kg 1,992 kg 1,770 kg 1,333 kg
Overall CO2e consumed pre improvement 245 k
tons
87 k
tons
1,228 k
tons
753 k tons 1,807 k tons 1,926 k tons 1,807 k tons 1,926 k tons
Overall reduction in CO2e 47.1 k
tons
15.6 k tons 232.3 k
tons
129.4 k tons 582.7 k tons 463.4 k tons 295.7 k tons 310.1 k tons
Mean Primary Energy consumed pre improvement 58,127 50,737 54,112 59,016 48,797 45,259 48,797 45,259
Mean reduction in PE 11,313 8,274 9,821 10,000 15,165 10,729 7,792 7,159
Overall PE consumed before package 1,157 m 496 m 5,460 m 4,119 m 8,152 m 10,567 m 8,152 m 10,567 m
Overall reduction in PE 225 m 81 m 991 m 698 m 2,533 m 2,497 m 1,302 m 1,666 m
Mean Delivered Energy consumed pre improvement 42,919 23,256 38,170 36,610 33,315 29,523 33,315 29,523
Mean reduction in DE 8,237 4,130 8,361 6,157 11,462 7,107 5,695 4,697
Overall DE consumed before package 854 m 227 m 3,852 m 2,555 m 5,566 m 6,893 m 5,566 m 6,893 m
Overall reduction in DE 164 m 40 m 844 m 430 m 1,915 m 1,654 m 951 m 1,093 m
Median payback period 1.11 .98 2.97 1.61 5.06 3.24 2.59 2.46
Mean payback period 1.28 0.92 3.06 1.97 6.36 4.51 3.58 3.37
Mean capital cost per SAP point increase £59 £29 £115 £59 £203 £120 £122 £89

Table A8.15: Scenarios by tenure (Owner-occupied compared to Private Rented Sector)

  Scenario 1 Scenario 2 Scenario 3 Scenario 4
All dwellings to reach Band F All dwellings to reach Band E All dwellings to reach Band D ALL EFG dwellings to improve one band
OO PRS OO PRS OO PRS OO PRS
Number of dwellings improved 17,776 11,900 128,680 42,028 322,838 77,710 322,838 77,710
Mean SAP score pre improvement 12.2 12.4 29.4 25.6 40.3 35.8 40.3 35.8
Mean SAP score increase 12.9 15.0 12.4 16.7 15.5 20.2 9.1 10.6
Mean EI score pre improvements 24.0 24.3 25.2 22.7 32.8 30.8 32.8 30.8
Mean EI score increase 6.7 9.1 7.1 9.1 11.6 13.2 6.8 7.0
Mean capital cost of improvements £710 £502 £1,192 £1,353 £2,538 £3,230 £992 £873
Overall capital cost of improvements £12.6 m £6.0 m £153.4 m £56.9 m £819.2 m £251.0 m £320.2 m £67.9 m
Banded capital cost: %age (n) £0-£200 16%
(2,931)
8%
(1,005)
14%
(17,815)
8%
(3,526)
17%
(54,537)
17%
(13,541)
23%
(75,284)
23%
(18,072)
Banded capital cost: %age (n) £201-£500 39%
(6,908)
71%
(8,488)
35%
(45,234)
35%
(14,736)
14%
(44,104)
11%
(8,585)
29%
(92,318)
37%
(29,015)
Banded capital cost: %age (n) £501-£1,000 24%
(4,312)
14%
(1,688)
17%
(21,469)
9%
(3,633)
7%
(24,195)
8%
(5,993)
15%
(47,379)
12%
(9,708)
Banded capital cost: %age (n) £1,001-£2,000 16%
(2,817)
4%
(449)
10%
(12,548)
19%
(7,969)
16%
(52,447)
13%
(10,278)
17%
(55,331)
14%
(10,715)
Banded capital cost: %age (n) £2,001-£5,000 4%
(769)
2%
(234)
23%
(29,592)
27%
(11,553)
34%
(109,833)
30%
(23,168)
15%
(48,794)
12%
(9,380)
Banded capital cost: %age (n) £5,001-£10,000 0%
(39)
0%
(37)
1%
(1,820)
1%
(340)
6%
(20,592)
11%
(8,521)
1%
(3,733)
1%
(819)
Banded capital cost: %age (n) >£10,000 0%
(-)
0%
(-)
0%
(202)
1%
(271)
5%
(17,131)
10%
(7,625)
0%
(-)
0%
(-)
Mean fuel cost pre improvement £2,535 £2,357 £2,097 £1,957 £1,656 £1,587 £1,656 £1,587
Mean reduction in fuel costs £547 £535 £442 £527 £466 £554 £274 £299
Overall fuel cost pre improvement £45.1 m £28.0 m £269.8 m £82.2 m £534.5 m £123.3 m £534.5 m £123.3 m
Overall reduction in fuel costs £9.7 m £6.4 m £56.8 m £22.2 m £149.9 m £43.0 m £88.4 m £23.2 m
Mean CO2e consumed pre improvement 11,434
kg
10,843 kg 11,807
kg
10,983 kg 9,429
kg
8,861
kg
9,429
kg
8,861
kg
Mean reduction in CO2e consumed 2,075
kg
2,169
kg
2,027
kg
2,401
kg
2,560
kg
2,852
kg
1,516
kg
1,513
kg
Overall CO2e consumed pre improvement 203 k
tons
129 k tons 1,519 k tons 462 k tons 3,044 k tons 689 k tons 3,044 k tons 689 k
tons
Overall reduction in CO2e 36.9 k
tons
25.8 k tons 260.8 k tons 100.9 k tons 824.5 k tons 221.6 k tons 488.2 k tons 117.6 k tons
Mean Primary Energy consumed pre improvement 57,353 53,218 56,874 53,798 47,266 44,525 47,266 44,525
Mean reduction in PE 10,026 10,740 9,430 11,314 12,305 13,734 7,428 7,407
Overall PE consumed before package 1,019 m 633 m 7,319 m 2,261 m 15,259 m 3,460 m 15,259 m 3,460 m
Overall reduction in PE 178 m 128 m 1,214 m 476 m 3,963 m 1,067 m 2,392 m 576 m
Mean Delivered Energy consumed pre improvement 36,863 35,827 38,807 33,630 31,991 27,422 31,991 27,422
Mean reduction in DE 6,788 7,031 7,275 8,024 8,845 9,265 5,209 4,717
Overall DE consumed before package 655 m 426 m 4,994 m 1,413 m 10,328 m 2,131 m 10,328 m 2,131 m
Overall reduction in DE 121 m 84 m 936 m 337 m 2,849 m 720 m 1,678 m 367 m
Median payback period 1.06 .74 2.21 2.39 3.75 3.75 2.56 1.85
Mean payback period 1.30 0.94 2.70 2.57 5.45 5.83 3.61 2.92
Mean capital cost per SAP point increase £55 £34 £96 £81 £164 £160 £109 £82

Table A8.16: Scenario 2 by EPC band pre-improvements

  Scenario 2
All dwellings to reach Band E
  Dwellings in EPC band G Dwellings in EPC band F All dwellings
Number of dwellings improved 29,676 141,032 170,708
Mean SAP score pre improvement 12.3 31.8 28.5
Mean SAP score increase 29.5 10.0 13.4
Mean EI score pre improvements 24.1 24.7 24.6
Mean EI score increase 11.5 6.7 7.5
Mean capital cost of improvements £2,863 £888 £1,232
Overall capital cost of improvements £85.0 m £125.3 m £210.2 m
Banded capital cost: %age (n)
£0-£200
0%
(-)
15%
(21,341)
13%
(21,341)
Banded capital cost: %age (n)
£201-£500
3%
(935)
42%
(59,035)
35%
(59,970)
Banded capital cost: %age (n)
£501-£1,000
12%
(3,611)
15%
(21,491)
15%
(25,102)
Banded capital cost: %age (n)
£1,001-£2,000
12%
(3,504)
12%
(17,012)
12%
(20,517)
Banded capital cost: %age (n)
£2,001-£5,000
64%
(18,993)
16%
(22,152)
24%
(41,145)
Banded capital cost: %age (n)
£5,001-£10,000
7%
(2,160)
0%
(-)
1%
(2,160)
Banded capital cost: %age (n)
>£10,000
2%
(473)
0%
(-)
0%
(473)
Mean fuel cost pre improvement £2,464 £1,978 £2,062
Mean reduction in fuel costs (£ per annum) £1,053 £338 £463
Overall fuel cost pre improvement £73.1 m £278.9 m £352.0 m
Overall reduction in fuel costs £31.3 m £47.7 m £79.0 m
Mean CO2e consumed pre improvement 11,197 kg 11,690 kg 11,604 kg
Mean reduction in CO2e consumed 3,317 kg 1,867 kg 2,119 kg
Overall CO2e consumed pre improvement 332k tons 1,649k tons 1,981k tons
Overall reduction in CO2e 98.4k tons 263k tons 362k tons
Mean Primary Energy consumed pre improvement 55,695 56,206 56,117
Mean reduction in PE (kWh per annum) 14,956 8,829 9,894
Overall PE consumed before package 1,653 m 7,927 m 9,580 m
Overall reduction in PE 444 m 1,245 m 1,689 m
Mean Delivered Energy consumed pre improvement 36,447 37,760 37,532
Mean reduction in DE (kWH per annum) 13,574 6,173 7,460
Overall DE consumed before package 1,082 m 5,325 m 6,407 m
Overall reduction in DE 403 m 871 m 1,273 m
Median payback period 2.72 1.99 2.32
Mean payback period 2.72 2.63 2.66
Mean capital cost per SAP point increase £97 £88 £92

Table A8.17: Scenario 3 by EPC band before package of improvements

  Scenario 3
All dwellings to reach Band D
  Dwellings in EPC band G EPC band F EPC band E All Dwellings in EFG
Number of dwellings improved 29,676 141,032 229,840 400,548
Mean SAP score pre improvement 12.3 31.8 47.6 39.4
Mean SAP score increase 43.4 23.8 8.4 16.4
Mean EI score pre improvements 24.1 24.7 38.2 32.4
Mean EI score increase 20.3 18.5 6.9 11.9
Mean capital cost of improvements £8,430 £4,083 £1,062 £2,672
Overall capital cost of improvements £250.2 m £575.9 m £244.2 m £1070.2 m
Banded capital cost: %age (n)
£0-£200
0%
(-)
0%
(-)
29%
(68,078)
17%
(68,078)
Banded capital cost: %age (n)
£201-£500
0%
(-)
4%
(5,787)
21%
(46,902)
13%
(52,689)
Banded capital cost: %age (n)
£501-£1,000
0%
(-)
0%
(591)
13%
(29,597)
8%
(30,187)
Banded capital cost: %age (n)
£1,001-£2,000
8%
(2,472)
10%
(14,485)
20%
(45,768)
16%
(62,725)
Banded capital cost: %age (n)
£2,001-£5,000
25%
(7,318)
64%
(90,662)
15%
(35,020)
33%
(133,000)
Banded capital cost: %age (n)
£5,001-£10,000
26%
(7,618)
12%
(17,018)
2%
(4,477)
7%
(29,113)
Banded capital cost: %age (n)
>£10,000
41%
(12,268)
9%
(12,488)
0%
(-)
6%
(24,756)
Mean fuel cost pre improvement £2,464 £1,978 £1,331 £1,642
Mean reduction in fuel costs (£ per annum) £1,398 £735 £209 £483
Overall fuel cost pre improvement £73.1 m £278.9 m £305.8 m £657.8 m
Overall reduction in fuel costs £41.5 m £103.7 m £47.8 m £193.0 m
Mean CO2e consumed pre improvement 11,197 kg 11,690 kg 7,622 kg 9,319 kg
Mean reduction in CO2e consumed (kg per year) annum) 5,036 kg 4,374 kg 1,222 kg 2,617 kg
Overall CO2e consumed pre improvement 332 k tons 1,649 k tons 1,752 k tons 3,733 k tons
Overall reduction in CO2e 149 k tons 617 k tons 280 k tons 1046 k tons
Mean Primary Energy consumed pre improvement 55,695 56,206 39,765 46,734
Mean reduction in PE (kWh per annum) 25,267 20,305 6,184 12,583
Overall PE consumed before package 1,653 m 7,927 m 9,140 m 18,719 m
Overall reduction in PE 750 m 2,864 m 1,416 m 5,030 m
Mean Delivered Energy consumed pre improvement 36,447 37,760 26,330 31,104
Mean reduction in DE (kWh per annum) 19,511 14,325 4,232 8,927
Overall DE consumed before package 1,082 m 5,325 m 6,052 m 12,459 m
Overall reduction in DE 579 m 2,020 m 969 m 3,569 m
Median payback period 6.20 4.86 3.08 3.75
Mean payback period 6.03 5.55 5.09 5.54
Mean capital cost per SAP point increase £194 £171 £126 £163

Table A8.18: Scenario 4 by EPC band before package of improvements

  Scenario 4
All dwellings to increase one band
  Dwellings in band G Dwellings in band F Dwellings in band E All EFG Dwellings
Number of dwellings improved 29,676 141,032 229,840 400,548
Mean SAP score pre improvement 12.3 31.8 47.6 39.4
Mean SAP score increase 13.7 10.1 8.4 9.4
Mean EI score pre improvements 24.1 24.7 38.2 32.4
Mean EI score increase 7.6 6.7 6.9 6.9
Mean capital cost of improvements £627 £888 £1,062 £969
Overall capital cost of improvements £18.6 m £125.3 m £244.2 m £388.1 m
Banded capital cost: %age (n)
£0-£200
13%
(3,936)
15%
(21,341)
30%
(68,078)
23%
(93,335)
Banded capital cost: %age (n)
£201-£500
52%
(15,396)
42%
(59,035)
20%
(46,902)
30%
(121,333)
Banded capital cost: %age (n)
£501-£1,000
20%
(6,000)
15%
(21,491)
13%
(29,597)
14%
(57,087)
Banded capital cost: %age (n)
£1,001-£2,000
11%
(3,266)
12%
(17,012)
20%
(45,768)
16%
(66,046)
Banded capital cost: %age (n)
£2,001-£5,000
3%
(1,002)
16%
(22,152)
15%
(35,020)
15%
(58,174)
Banded capital cost: %age (n)
£5,001-£10,000
0%
(76)
0%
(-)
2%
(4,477)
1%
(4,553)
Banded capital cost: %age (n)
>£10,000
0%
(-)
0%
(-)
0%
(-)
0%
(-)
Mean fuel cost pre improvement £2,464 £1,978 £1,331 £1,642
Mean reduction in fuel costs (£ per annum) £542 £338 £209 £279
Overall fuel cost pre improvement £73.1 m £278.9 m £305.8 m £657.8 m
Overall reduction in fuel costs £16.1 m £47.7 m £47.8 m £111.6 m
Mean CO2e consumed pre improvement 11,197 kg 11,690 kg 7,622 kg 9,319 kg
Mean reduction in CO2e consumed (kg per annum) 2,113 kg 1,867 kg 1,222 kg 1,515 kg
Overall CO2e consumed pre improvement 332 k tons 1,649 k tons 1,752 k tons 3,733 k tons
Overall reduction in CO2e 62.7 k tons 263.3 k tons 279.8 k tons 605.8 k tons
Mean Primary Energy consumed pre improvement 55,695 56,206 39,765 46,734
Mean reduction in PE (kWh per annum) 10,313 8,829 6,184 7,424
Overall PE consumed before package 1,653 m 7,927 m 9,140 m 18,719 m
Overall reduction in PE 306 m 1,245 m 1,416 m 2,968 m
Mean Delivered Energy consumed pre improvement 36,447 37,760 26,330 31,104
Mean reduction in DE (kWh per annum) 6,885 6,173 4,232 5,114
Overall DE consumed before package 1,082 m 5,325 m 6,052 m 12,459 m
Overall reduction in DE 204 m 871 m 969 m 2,044 m
Median payback period 1.06 1.99 3.08 2.48
Mean payback period 1.16 2.63 5.09 3.47
Mean capital cost per SAP point increase £46 £88 £126 £103

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