CF23 is around the national average for energy efficiency.
Energy efficiency in CF23 (Cardiff) sits at an average score of 67 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 6.3% of homes rated A or B and 82.9% 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.
Most of the housing stock here consists of houses. Flats make up a notable 26% of homes here. Around 64% of properties are owner-occupied , while 21% are privately rented . Gas central heating is the main fuel source for 92% 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 67 to 80 — a 13-point jump that would lift the typical rating to C. If you live in CF23 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: 80 (rating C)
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 CF23?
Homes in CF23 have an average EPC rating of D, scoring 67 out of 100 for energy efficiency. That figure comes from 13,430 certificates issued across the district.
This is broadly in line with the national average of 67 — neither particularly efficient nor particularly wasteful. A D rating typically means higher-than-necessary heating bills, especially in older properties without adequate insulation.
What percentage of homes in CF23 are rated F or G?
1.4% of homes in CF23 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 CF23 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.