What insulation adds in EN8
The realistic uplift
Each energy certificate lists the improvements an assessor recommends and the rating the home would reach if they were done. Averaged across 913 certificates in EN8, the current rating of 61.6 could rise to about 78.0 out of 100. The estimated annual heating cost averages £645 now, and about £434 after the recommended work – an estimated saving of roughly £211 a year.
These are the register's own estimates, averaged across many homes; the figure for any one property depends on its fabric and how it is heated.
What the certificates say about the fabric
The most common construction descriptions recorded across these certificates. Percentages are of certificates where the field was recorded.
Walls
- Cavity wall, as built, no insulation (assumed) – 32.5%
- Solid brick, as built, no insulation (assumed) – 25.0%
- Cavity wall, filled cavity – 17.5%
Recorded as having no wall insulation: 62.5%.
Roofs
- (another dwelling above) – 30.0%
- Pitched, no insulation (assumed) – 12.5%
- Pitched, 100 mm loft insulation – 12.5%
Recorded as having no roof insulation: 15.0%.
Glazing
- Fully double glazed – 100.0%
Main heating
- Boiler and radiators, mains gas – 77.5%
- Electric storage heaters – 15.0%
- Room heaters, electric – 5.0%
Which streets need it most
See the streets in EN8 with the highest share of homes rated band D or below.
Leakiest streets in EN8Keep exploring
Biggest average savings nearby
- What insulation adds in RM11 ~£463/yr average saving
- What insulation adds in TN14 ~£444/yr average saving
- What insulation adds in EC4Y ~£405/yr average saving
- What insulation adds in KT8 ~£391/yr average saving
- What insulation adds in N14 ~£379/yr average saving
- What insulation adds in RM4 ~£371/yr average saving
- What insulation adds in HA7 ~£342/yr average saving
- What insulation adds in CR3 ~£328/yr average saving