What insulation adds in EC4Y

63.0 → 77.0

Rating, now → potential

+14.1

Average uplift

£405

Avg saving / yr

321

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 321 certificates in EC4Y, the current rating of 63.0 could rise to about 77.0 out of 100. The estimated annual heating cost averages £768 now, and about £363 after the recommended work – an estimated saving of roughly £405 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) – 70.0%
Timber frame, as built, no insulation (assumed) – 10.0%
System built, as built, insulated (assumed) – 7.5%

Recorded as having no wall insulation: 82.5%.

Roofs

(another dwelling above) – 42.5%
Flat, no insulation (assumed) – 22.5%
Pitched, 250 mm loft insulation – 17.5%

Recorded as having no roof insulation: 30.0%.

Glazing

Single glazed – 48.5%
Fully double glazed – 24.2%
Full secondary glazing – 9.1%

Main heating

Boiler and radiators, mains gas – 65.0%
Room heaters, electric – 17.5%
Community scheme – 12.5%

Which streets need it most

See the streets in EC4Y with the highest share of homes rated band D or below.

Leakiest streets in EC4Y

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