Data from 20,932 property assessments shows SE15 averaging 69 out of 100, placing it around the national average. For reference, the England and Wales average is 67 — so SE15 is around that benchmark. The most common rating band is C, with 15.6% of homes rated A or B and 75.0% in the C or D bands. Meanwhile, 1% of homes sit in the F or G bands — the least efficient categories. In practical terms, a C rating suggests reasonably efficient homes, though there is still room for improvement on heating and insulation.

Walk through SE15 and you will mostly see flats. Flats alone account for 63% of all certificated properties — a distinctly urban profile. Around 39% of properties are owner-occupied , while 24% are privately rented and 37% are social housing. Gas central heating is the main fuel source for 86% of homes, which is typical for urban areas across England.

There is genuine room for improvement here. If every recommended upgrade were carried out, the average score could climb from 69 to 78 — a 9-point jump that would lift the typical rating to C. If you live in SE15 and want to reduce your energy bills, start with our guide to loft insulation — it is one of the most cost-effective upgrades you can make.