NN1 is around the national average for energy efficiency.
Looking at the energy data for NN1, this West Northamptonshire district scores an average of 66 out of 100, placing it around the national average. Compared to the national average of 67, that puts NN1 around the norm for England and Wales. The most common rating band is D, with 8.8% of homes rated A or B and 76.8% in the C or D bands. Meanwhile, 1.9% of homes sit in the F or G bands — the least efficient categories. In practical terms, a rating of D means many homes here lose more heat than average — potentially adding £200-400 per year to energy bills compared to a C-rated home.
The area is characterised by flats. Flats alone account for 51% of all certificated properties — a distinctly urban profile. Around 40% of properties are owner-occupied , while 43% are privately rented and 17% are social housing. That high proportion of rental homes matters — landlords in NN1 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 74% 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 66 to 78 — a 12-point jump that would lift the typical rating to C. If you live in NN1 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: 78 (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
Over 35% of homes in NN1 are privately rented — private rental properties often have lower EPC ratings.
Main Fuel Types
Frequently asked questions
What is the average EPC rating in NN1?
Homes in NN1 have an average EPC rating of D, scoring 66 out of 100 for energy efficiency. That figure comes from 13,562 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 NN1 are rated F or G?
1.9% of homes in NN1 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 NN1 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.