What insulation adds in EN1

63.7 → 79.1

Rating, now → potential

+15.4

Average uplift

£214

Avg saving / yr

21986

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 21986 certificates in EN1, the current rating of 63.7 could rise to about 79.1 out of 100. The estimated annual heating cost averages £659 now, and about £445 after the recommended work – an estimated saving of roughly £214 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) – 42.5%
Cavity wall, as built, no insulation (assumed) – 17.5%
Cavity wall, as built, insulated (assumed) – 15.0%

Recorded as having no wall insulation: 60.0%.

Roofs

Pitched, 100 mm loft insulation – 15.0%
(another dwelling above) – 15.0%
Pitched, no insulation (assumed) – 10.0%

Recorded as having no roof insulation: 12.5%.

Glazing

Fully double glazed – 65.4%
Single glazed – 11.5%
Mostly double glazing – 11.5%

Main heating

Boiler and radiators, mains gas – 70.0%
Electric storage heaters – 17.5%
Room heaters, electric – 5.0%

Which streets need it most

See the streets in EN1 with the highest share of homes rated band D or below.

Leakiest streets in EN1

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In this area

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