What insulation adds in HA9

75.2 → 80.9

Rating, now → potential

+5.8

Average uplift

£100

Avg saving / yr

29709

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 29709 certificates in HA9, the current rating of 75.2 could rise to about 80.9 out of 100. The estimated annual heating cost averages £477 now, and about £377 after the recommended work – an estimated saving of roughly £100 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) – 22.5%
Cavity wall, as built, no insulation (assumed) – 10.0%
Average thermal transmittance 0.18 W/m²K – 10.0%

Recorded as having no wall insulation: 32.5%.

Roofs

(other premises above) – 42.5%
(another dwelling above) – 15.0%
Pitched, no insulation (assumed) – 5.0%

Recorded as having no roof insulation: 5.0%.

Glazing

Fully double glazed – 84.6%
Partial double glazing – 7.7%
High performance glazing – 7.7%

Main heating

Community scheme – 50.0%
Boiler and radiators, mains gas – 40.0%
Warm air, Electricaire – 2.5%

Which streets need it most

See the streets in HA9 with the highest share of homes rated band D or below.

Leakiest streets in HA9

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