Leakiest streets in SW20

57.7%

Band D or below

15406

Certificates

69.4

Average rating

£119

Avg potential saving / yr

What this means

Across 15406 energy certificates in SW20, 8883 (57.7%) are rated band D or below. The average current rating is 69.4 out of 100, which the recommended improvements on those certificates would lift to about 77.9. The average estimated annual heating cost is £503, falling to about £384 after the recommended work – a saving of roughly £119 a year.

A B C D E F G

A 1.0% B 10.1% C 31.2% D 39.2% E 14.7% F 3.0% G 0.8%

Every figure is computed across the certificates in this area – no individual property is identified or listed.

How SW20 compares

Set against the average across the 3,339,357 energy certificates in our dataset (average current rating 67.8, with 51.7% band D or below):

Band D or below here is 57.7%, 6.0 points higher (leakier).
The average current rating here is 69.4, 1.6 points above the wider-dataset average.

Indicative comparison against the certificates we hold, not an official national statistic. Check the official source for area statistics.

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%

Retrofit measures for this housing stock

Based on the construction recorded on the certificates here, these guides cover the measures that most often apply, with typical UK costs and savings cited to public sources.

All retrofit guides

What insulation adds in SW20

See the average current-to-potential uplift and the estimated heating-cost saving for this area.