What insulation adds in WC1B

65.9 → 74.8

Rating, now → potential

+8.9

Average uplift

£243

Avg saving / yr

845

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 845 certificates in WC1B, the current rating of 65.9 could rise to about 74.8 out of 100. The estimated annual heating cost averages £722 now, and about £479 after the recommended work – an estimated saving of roughly £243 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) – 67.5%
Cavity wall, as built, no insulation (assumed) – 10.0%
Timber frame, as built, no insulation (assumed) – 2.5%

Recorded as having no wall insulation: 82.5%.

Roofs

(another dwelling above) – 75.0%
Flat, no insulation (assumed) – 7.5%
Pitched, no insulation (assumed) – 2.5%

Recorded as having no roof insulation: 12.5%.

Glazing

Single glazed – 40.9%
Fully double glazed – 18.2%
Partial secondary glazing – 13.6%

Main heating

Boiler and radiators, mains gas – 57.5%
Community scheme – 15.0%
Room heaters, electric – 7.5%

Which streets need it most

See the streets in WC1B with the highest share of homes rated band D or below.

Leakiest streets in WC1B

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