What insulation adds in TW3

64.9 → 76.5

Rating, now → potential

+11.6

Average uplift

£172

Avg saving / yr

20068

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 20068 certificates in TW3, the current rating of 64.9 could rise to about 76.5 out of 100. The estimated annual heating cost averages £629 now, and about £457 after the recommended work – an estimated saving of roughly £172 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) – 55.0%
Cavity wall, as built, no insulation (assumed) – 15.0%
System built, as built, insulated (assumed) – 6.2%

Recorded as having no wall insulation: 71.2%.

Roofs

(another dwelling above) – 22.5%
Pitched, no insulation (assumed) – 21.2%
Pitched, 200 mm loft insulation – 7.5%

Recorded as having no roof insulation: 25.0%.

Glazing

Fully double glazed – 95.7%
Single glazed – 2.2%
High performance glazing – 2.2%

Main heating

Boiler and radiators, mains gas – 76.2%
Electric storage heaters – 8.8%
Community scheme – 7.5%

Which streets need it most

See the streets in TW3 with the highest share of homes rated band D or below.

Leakiest streets in TW3

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