What insulation adds in TW1

64.6 → 73.3

Rating, now → potential

+8.8

Average uplift

£111

Avg saving / yr

14558

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 14558 certificates in TW1, the current rating of 64.6 could rise to about 73.3 out of 100. The estimated annual heating cost averages £472 now, and about £361 after the recommended work – an estimated saving of roughly £111 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, insulated (assumed) – 46.2%
Solid brick, as built, no insulation (assumed) – 25.0%
Cavity wall, as built, no insulation (assumed) – 8.8%

Recorded as having no wall insulation: 33.8%.

Roofs

(another dwelling above) – 53.8%
Pitched, 100 mm loft insulation – 11.2%
Pitched, insulated (assumed) – 7.5%

Recorded as having no roof insulation: 10.0%.

Glazing

Fully double glazed – 76.3%
Single glazed – 13.2%
Partial double glazing – 5.3%

Main heating

Electric storage heaters – 40.0%
Boiler and radiators, mains gas – 37.5%
Room heaters, electric – 12.5%

Which streets need it most

See the streets in TW1 with the highest share of homes rated band D or below.

Leakiest streets in TW1

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