Does a C-or-better EPC sell for more in NN6 6 (West Northamptonshire)?
Too few comparable sales here for a reliable like-for-like figure. In postcode sector NN6 6 (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 NN6 as a whole the like-for-like difference is +0.7% (95% range −0.6% to +2.1%). The raw gap is bigger: C+ homes sold for 1% less per square metre than D–G homes (median £2,827 vs £2,843, 573 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 143 m² against 112 m² for D–G; the most common build period is 2012 onwards for C+ and before 1900 for D–G; 91% of C+ and 85% 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 NN6 6
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 2 | too few |
| B | 61 | £2,770 |
| C | 76 | £2,893 |
| D | 209 | £2,908 |
| E | 138 | £2,907 |
| F | 77 | £2,639 |
| G | 10 | £2,250 |
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 | 90 | £2,942 | 243 | £2,830 |
| Semi-detached | 36 | £2,416 | 125 | £2,788 |
| Terraced | 13 | £3,261 | 66 | £2,930 |
Compared with the wider area
| Area | Sales | Like-for-like | 95% range |
|---|---|---|---|
| Sector NN6 6 | 573 | too few | — |
| District NN6 | 7,106 | +0.7% | −0.6% to +2.1% |
| England and Wales | 1,000,000 (sample) | +1.2% | +0.9% to +1.5% |
Average gas use in NN6 6 (2024): meters vs certificates
A rough comparison: the certificate figure is an upper-bound estimate (primary energy including lighting, converted with one factor), so treat the share as an order of magnitude.
| Postcodes with published gas data (5+ meters) | 2 (37 meters) |
|---|---|
| Median gas use per meter (median of postcodes) | 9,648 kWh |
| Gas-heated homes with an EPC | 24 |
| Energy implied by their certificates (median) | 20,192 kWh |
| Metered gas as a share of the certificate figure (median of 1 postcodes) | 58% (middle half 58%–58%) |
Certificate energy = primary energy per m² × floor area ÷ 1.13, for homes whose latest certificate shows mains gas heating; it also covers lighting and other uses, so it is an upper bound for gas. DESNZ gas is weather-corrected and covers all meters in the postcode, with or without a certificate.
573 of 651 house and flat sales in the sector since 2015 (88%) 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.