Does a C-or-better EPC sell for more in NN11 7 (West Northamptonshire)?
Too few comparable sales here for a reliable like-for-like figure. In postcode sector NN11 7 (West Northamptonshire), comparing like with like — same floor area, property type, build period and year of sale — there are too few comparable sales in each group for a reliable figure; for district NN11 as a whole the like-for-like difference is −4.0% (95% range −5.1% to −2.9%). The raw gap is different: C+ homes sold for 3% less per square metre than D–G homes (median £2,797 vs £2,882, 267 sales 2015–2026), mostly because they are different homes. Across England and Wales the like-for-like figure is +1.2%. Data: HM Land Registry Price Paid to 30 September 2026 matched to the EPC register.
From the raw gap to like-for-like
The homes are not alike: C+ homes here have a median floor area of 78 m² against 96 m² for D–G; the most common build period is 2007–2011 for C+ and 1950–1966 for D–G; 39% of C+ and 77% of D–G sales are detached or semi-detached houses.
This sector has fewer than 150 matched sales, fewer than 30 in one group, or an estimate too imprecise or implausibly large to trust, so the like-for-like comparison is not shown; the district figure is above.
Sold prices by EPC band in NN11 7
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 1 | too few |
| B | 7 | too few |
| C | 23 | £2,692 |
| D | 114 | £2,778 |
| E | 84 | £3,070 |
| F | 29 | £2,717 |
| G | 9 | too few |
A median is shown when a band has at least 10 sales.
C or better vs D–G, by property type
| Type | C+ sales | C+ £/m² | D–G sales | D–G £/m² |
|---|---|---|---|---|
| Detached | 5 | — | 95 | £3,012 |
| Semi-detached | 7 | — | 87 | £2,812 |
| Terraced | 3 | — | 46 | £2,727 |
| Flat / maisonette | 16 | £2,433 | 8 | — |
Compared with the wider area
| Area | Sales | Like-for-like | 95% range |
|---|---|---|---|
| Sector NN11 7 | 267 | too few | — |
| District NN11 | 7,495 | −4.0% | −5.1% to −2.9% |
| England and Wales | 1,000,000 (sample) | +1.2% | +0.9% to +1.5% |
267 of 298 house and flat sales in the sector since 2015 (90%) were matched to a certificate.
How this is calculated
- Every standard sale (HM Land Registry Price Paid, category A) since January 2015 is matched to the latest energy certificate of the same address (postcode + house number or name + flat) lodged from 10 years before to 3 months after the sale; sales with no certificate or an ambiguous match are left out. Across England and Wales 92% of sales match.
- Price per m² uses the certificate's total floor area (15–1,000 m²).
- Like-for-like premium: regression of the log of price on “C or better”, log floor area, property type, the certificate's build period and the year of sale. The 95% range shows how precise the estimate is; when it includes zero, the data cannot tell the premium apart from none.
Caveats
- The band is the one on the certificate before the sale; certificates are a median 0.8 years old at the sale, but a quarter are over 4 years old and some homes were improved since.
- Condition, garden, parking, views and the exact position within the sector are not known; a premium could hide in them, or they could hide one.
- Individual sales and addresses are not shown.