What insulation adds in TW5

67.3 → 79.0

Rating, now → potential

+11.7

Average uplift

£157

Avg saving / yr

9766

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 9766 certificates in TW5, the current rating of 67.3 could rise to about 79.0 out of 100. The estimated annual heating cost averages £574 now, and about £417 after the recommended work – an estimated saving of roughly £157 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) – 37.5%
Cavity wall, as built, no insulation (assumed) – 20.0%
Cavity wall, as built, insulated (assumed) – 15.0%

Recorded as having no wall insulation: 60.0%.

Roofs

(another dwelling above) – 30.0%
Pitched, 200 mm loft insulation – 10.0%
Pitched, 100 mm loft insulation – 10.0%

Recorded as having no roof insulation: 10.0%.

Glazing

Fully double glazed – 92.0%
Multiple glazing throughout – 4.0%
Fully triple glazed – 4.0%

Main heating

Boiler and radiators, mains gas – 85.0%
Community scheme – 10.0%
Boiler and radiators, electric – 2.5%

Which streets need it most

See the streets in TW5 with the highest share of homes rated band D or below.

Leakiest streets in TW5

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