SO31 is around the national average for energy efficiency.
Across 15,581 assessed properties, SO31 achieves an average EPC score of 70 out of 100, placing it around the national average. For reference, the England and Wales average is 67 — so SO31 is around that benchmark. The most common rating band is C, with 20.8% of homes rated A or B and 70.4% in the C or D bands. Meanwhile, 1.4% 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 SO31 and you will mostly see houses. Around 73% of properties are owner-occupied . Gas central heating is the main fuel source for 89% 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 82 — a 12-point jump that would lift the typical rating to B. If you live in SO31 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.
EPC Rating Distribution
Energy Efficiency Score
Potential score if all improvements made: 82 (rating B)
Recommended Improvements
Government funding may be available for some of these improvements. Check grants →
More data — property types, tenure & fuel
Property Types
Tenure
Main Fuel Types
Frequently asked questions
What is the average EPC rating in SO31?
Homes in SO31 have an average EPC rating of C, scoring 70 out of 100 for energy efficiency. That figure comes from 15,581 certificates issued across the district.
This is broadly in line with the national average of 67 — neither particularly efficient nor particularly wasteful.
What percentage of homes in SO31 are rated F or G?
1.4% of homes in SO31 fall into the F or G bands — the lowest energy efficiency ratings. Nationally, the figure is 2.9%.
This is actually better than the national picture, suggesting the housing stock in SO31 is in relatively good shape — though any home rated F or G would still benefit enormously from basic upgrades. Landlords should note that F and G rated properties cannot legally be rented out under current MEES rules.