Leakiest streets in TW4

47.8%

Band D or below

10697

Certificates

67.8

Average rating

£142

Avg potential saving / yr

What this means

Across 10697 energy certificates in TW4, 5116 (47.8%) are rated band D or below. The average current rating is 67.8 out of 100, which the recommended improvements on those certificates would lift to about 78.4. The average estimated annual heating cost is £525, falling to about £383 after the recommended work – a saving of roughly £142 a year.

A B C D E F G

A 0.1% B 10.6% C 41.5% D 37.1% E 9.1% F 1.3% G 0.4%

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

How TW4 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 47.8%, 3.9 points lower (more efficient).
The average current rating here is 67.8, level with 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) – 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%

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 TW4

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