EPC rating and sold prices in NP13 (Blaenau Gwent)
In postcode district NP13 (Blaenau Gwent), homes rated EPC C or better sold for 32% more per square metre than D–G homes (median £1,385 vs £1,051, 2,599 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 5.4% more (95% range +2.1% to +8.9%). 1 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 85 m² against 83 m² for D–G; both groups are most often built in 1900–1929; 33% of C+ and 17% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +32% | — |
| Whole price, nothing held equal | +35.0% | +28.0% to +42.3% |
| Same floor area | +26.2% | +21.3% to +31.3% |
| + same property type | +18.1% | +14.0% to +22.3% |
| + same build period | +16.5% | +11.8% to +21.3% |
| + same year of sale | +5.4% | +2.1% to +8.9% |
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 NP13
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| NP13 1 | 1,078 | +20% | +2.6% | −2.2% to +7.7% |
| NP13 2 | 924 | +21% | +5.8% | 0.0% to +11.9% |
| NP13 3 | 597 | +35% | +7.0% ▲ | +0.6% to +13.8% |
▲ 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 NP13
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| B | 22 | £1,860 |
| C | 436 | £1,369 |
| D | 1,384 | £1,122 |
| E | 609 | £923 |
| F | 125 | £900 |
| G | 23 | £646 |
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.