What insulation adds in TW4

67.8 → 78.4

Rating, now → potential

+10.6

Average uplift

£142

Avg saving / yr

10697

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 10697 certificates in TW4, the current rating of 67.8 could rise to about 78.4 out of 100. The estimated annual heating cost averages £525 now, and about £383 after the recommended work – an estimated saving of roughly £142 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) – 31.2%
Cavity wall, as built, insulated (assumed) – 17.5%
Cavity wall, filled cavity – 11.2%

Recorded as having no wall insulation: 51.2%.

Roofs

(another dwelling above) – 32.5%
Pitched, 100 mm loft insulation – 13.8%
Pitched, 300 mm loft insulation – 7.5%

Recorded as having no roof insulation: 10.0%.

Glazing

Fully double glazed – 80.9%
Mostly double glazing – 8.5%
High performance glazing – 6.4%

Main heating

Boiler and radiators, mains gas – 83.8%
Room heaters, electric – 7.5%
Electric storage heaters – 5.0%

Which streets need it most

See the streets in TW4 with the highest share of homes rated band D or below.

Leakiest streets in TW4

Keep exploring

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