EPC rating and sold prices in NP26 (Monmouthshire)
In postcode district NP26 (Monmouthshire), homes rated EPC C or better sold for 14% more per square metre than D–G homes (median £2,966 vs £2,601, 4,102 sales). Like for like — same size, type, build period and year — the difference is +0.8% (95% range −0.4% to +2.1%): the EPC band itself is not reflected in sale prices here. 0 of 3 sectors with enough sales show a difference distinguishable from zero. Data: HM Land Registry to 30 September 2026, EPC register.
From the raw gap to like-for-like
The homes are not alike: C+ homes here have a median floor area of 97 m² against 95 m² for D–G; the most common build period is 2012 onwards for C+ and 1967–1975 for D–G; 78% of C+ and 83% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +14% | — |
| Whole price, nothing held equal | +12.3% | +9.7% to +15.0% |
| Same floor area | +13.0% | +11.1% to +14.8% |
| + same property type | +12.3% | +10.6% to +14.0% |
| + same build period | +9.6% | +7.6% to +11.6% |
| + same year of sale | +0.8% | −0.4% to +2.1% |
The first row compares median prices per m²; the second compares whole prices; each later row adds one more thing that must be equal, ending with the like-for-like premium (regression of log price; build period from the certificate, 12 bands). The raw gap per m² and the whole-price gap differ because C+ and D–G homes differ in size.
Postcode sectors in NP26
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| NP26 3 | 1,677 | +13% | +1.1% | −0.7% to +2.8% |
| NP26 4 | 1,197 | +19% | +1.8% | −0.2% to +3.8% |
| NP26 5 | 1,228 | +13% | +1.3% | −1.5% to +4.2% |
▲ green: premium distinguishable from zero; ▼ red: discount; plain: no measurable difference. Small areas have fewer sales, so their 95% ranges are wider.
Sold prices by EPC band in NP26
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 31 | £3,175 |
| B | 802 | £3,064 |
| C | 1,520 | £2,888 |
| D | 1,402 | £2,620 |
| E | 297 | £2,431 |
| F | 38 | £2,852 |
| G | 12 | £2,734 |
A median is shown when a band has at least 10 sales.
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.