Based on 14,785 Energy Performance Certificates, HA1 in Harrow has an average EPC score of 70 out of 100, placing it around the national average. To put this in context, the national average sits at 67. The most common rating band is C, with 25.5% of homes rated A or B and 63.1% in the C or D bands. Meanwhile, 1.6% 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.

Most of the housing stock here consists of flats. Flats alone account for 68% of all certificated properties — a distinctly urban profile. Around 46% of properties are owner-occupied , while 44% are privately rented . That high proportion of rental homes matters — landlords in HA1 must comply with the Minimum Energy Efficiency Standards (MEES), which currently require at least an EPC E rating. Properties rated F or G cannot legally be let. Gas central heating is the main fuel source for 67% 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 70 to 79 — a 9-point jump that would lift the typical rating to C. If you live in HA1 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.