What insulation adds in KT8

57.5 → 72.0

Rating, now → potential

+14.6

Average uplift

£391

Avg saving / yr

226

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 226 certificates in KT8, the current rating of 57.5 could rise to about 72.0 out of 100. The estimated annual heating cost averages £1227 now, and about £836 after the recommended work – an estimated saving of roughly £391 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) – 57.5%
Cavity wall, as built, insulated (assumed) – 15.0%
Solid brick, with internal insulation – 5.0%

Recorded as having no wall insulation: 65.0%.

Roofs

(another dwelling above) – 37.5%
Pitched, no insulation (assumed) – 12.5%
Roof room(s), insulated – 5.0%

Recorded as having no roof insulation: 20.0%.

Glazing

Fully double glazed – 40.0%
Single glazed – 36.0%
Partial secondary glazing – 12.0%

Main heating

Boiler and radiators, mains gas – 70.0%
Room heaters, electric – 15.0%
Boiler and underfloor heating, mains gas – 7.5%

Which streets need it most

See the streets in KT8 with the highest share of homes rated band D or below.

Leakiest streets in KT8

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