EPC rating and sold prices in SA10 (Neath Port Talbot)
In postcode district SA10 (Neath Port Talbot), homes rated EPC C or better sold for 31% more per square metre than D–G homes (median £2,000 vs £1,524, 4,676 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 6.9% more (95% range +4.6% to +9.2%). 3 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 93 m² against 90 m² for D–G; the most common build period is 2012 onwards for C+ and 1900–1929 for D–G; 78% of C+ and 72% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +31% | — |
| Whole price, nothing held equal | +37.0% | +33.5% to +40.6% |
| Same floor area | +33.6% | +31.0% to +36.2% |
| + same property type | +25.6% | +23.4% to +27.9% |
| + same build period | +13.7% | +10.8% to +16.6% |
| + same year of sale | +6.9% | +4.6% to +9.2% |
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 SA10
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| SA10 6 | 2,031 | +36% | +4.0% ▲ | +0.5% to +7.7% |
| SA10 7 | 1,276 | +13% | +3.9% ▲ | +0.7% to +7.2% |
| SA10 8 | 875 | +26% | +10.6% ▲ | +5.8% to +15.6% |
| SA10 9 | 494 | +23% | too few | — |
▲ 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 SA10
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 1 | too few |
| B | 606 | £2,000 |
| C | 1,177 | £1,993 |
| D | 1,968 | £1,634 |
| E | 734 | £1,355 |
| F | 157 | £1,143 |
| G | 33 | £1,167 |
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.