What insulation adds in HA5

59.8 → 74.8

Rating, now → potential

+15.0

Average uplift

£269

Avg saving / yr

18238

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 18238 certificates in HA5, the current rating of 59.8 could rise to about 74.8 out of 100. The estimated annual heating cost averages £855 now, and about £587 after the recommended work – an estimated saving of roughly £269 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) – 40.0%
Cavity wall, as built, no insulation (assumed) – 28.8%
Cavity wall, filled cavity – 17.5%

Recorded as having no wall insulation: 68.8%.

Roofs

Pitched, 100 mm loft insulation – 20.0%
Pitched, no insulation (assumed) – 12.5%
(another dwelling above) – 12.5%

Recorded as having no roof insulation: 13.8%.

Glazing

Fully double glazed – 80.9%
Partial double glazing – 8.5%
Mostly double glazing – 6.4%

Main heating

Boiler and radiators, mains gas – 87.5%
Electric storage heaters – 5.0%
Warm air, mains gas – 2.5%

Which streets need it most

See the streets in HA5 with the highest share of homes rated band D or below.

Leakiest streets in HA5

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