What insulation adds in SW20

69.4 → 77.9

Rating, now → potential

+8.5

Average uplift

£119

Avg saving / yr

15406

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 15406 certificates in SW20, the current rating of 69.4 could rise to about 77.9 out of 100. The estimated annual heating cost averages £503 now, and about £384 after the recommended work – an estimated saving of roughly £119 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, insulated (assumed) – 10.0%
Average thermal transmittance 0.18 W/m²K – 10.0%

Recorded as having no wall insulation: 46.2%.

Roofs

(other premises above) – 22.5%
(another dwelling above) – 17.5%
Pitched, 100 mm loft insulation – 11.2%

Recorded as having no roof insulation: 7.5%.

Glazing

Fully double glazed – 86.1%
Mostly double glazing – 8.3%
Some double glazing – 2.8%

Main heating

Boiler and radiators, mains gas – 62.5%
Room heaters, electric – 30.0%
Electric storage heaters – 2.5%

Which streets need it most

See the streets in SW20 with the highest share of homes rated band D or below.

Leakiest streets in SW20

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