What insulation adds in TW10

67.1 → 77.4

Rating, now → potential

+10.3

Average uplift

£155

Avg saving / yr

10499

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 10499 certificates in TW10, the current rating of 67.1 could rise to about 77.4 out of 100. The estimated annual heating cost averages £751 now, and about £596 after the recommended work – an estimated saving of roughly £155 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) – 21.2%
Cavity wall, as built, insulated (assumed) – 20.0%
Cavity wall, as built, no insulation (assumed) – 18.8%

Recorded as having no wall insulation: 42.5%.

Roofs

Average thermal transmittance 0.11 W/m²K – 18.8%
(another dwelling above) – 17.5%
Pitched, 100 mm loft insulation – 13.8%

Recorded as having no roof insulation: 11.2%.

Glazing

Fully double glazed – 73.3%
Some double glazing – 10.0%
Single glazed – 10.0%

Main heating

Boiler and radiators, mains gas – 81.2%
Boiler and underfloor heating, mains gas – 10.0%
Community scheme – 3.8%

Which streets need it most

See the streets in TW10 with the highest share of homes rated band D or below.

Leakiest streets in TW10

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