What insulation adds in TW9

65.8 → 76.3

Rating, now → potential

+10.5

Average uplift

£153

Avg saving / yr

13581

Certificates

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 13581 certificates in TW9, the current rating of 65.8 could rise to about 76.3 out of 100. The estimated annual heating cost averages £575 now, and about £422 after the recommended work – an estimated saving of roughly £153 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

Solid brick, as built, no insulation (assumed) – 52.5%
Cavity wall, as built, insulated (assumed) – 15.0%
Timber frame, as built, insulated (assumed) – 7.5%

Recorded as having no wall insulation: 60.0%.

Roofs

(another dwelling above) – 37.5%
Pitched, no insulation (assumed) – 10.0%
Flat, insulated (assumed) – 7.5%

Recorded as having no roof insulation: 10.0%.

Glazing

Fully double glazed – 63.6%
Single glazed – 9.1%
Some multiple glazing – 4.5%

Main heating

Boiler and radiators, mains gas – 67.5%
Electric underfloor heating – 15.0%
Room heaters, electric – 5.0%

Which streets need it most

See the streets in TW9 with the highest share of homes rated band D or below.

Leakiest streets in TW9

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