What insulation adds in SW17

64.8 → 76.0

Rating, now → potential

+11.2

Average uplift

£178

Avg saving / yr

3156

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 3156 certificates in SW17, the current rating of 64.8 could rise to about 76.0 out of 100. The estimated annual heating cost averages £689 now, and about £510 after the recommended work – an estimated saving of roughly £178 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) – 65.0%
Average thermal transmittance 0.15 W/m²K – 10.0%
Cavity wall, as built, insulated (assumed) – 7.5%

Recorded as having no wall insulation: 70.0%.

Roofs

(another dwelling above) – 25.0%
Pitched, no insulation (assumed) – 17.5%
Pitched, 100 mm loft insulation – 10.0%

Recorded as having no roof insulation: 20.0%.

Glazing

Fully double glazed – 66.7%
Some double glazing – 9.5%
Single glazed – 9.5%

Main heating

Boiler and radiators, mains gas – 82.5%
Community scheme – 10.0%
No system present: electric heaters assumed – 2.5%

Which streets need it most

See the streets in SW17 with the highest share of homes rated band D or below.

Leakiest streets in SW17

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