Does a C-or-better EPC sell for more in SA3 1 (Swansea)?
Too few comparable sales here for a reliable like-for-like figure. In postcode sector SA3 1 (Swansea), 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 SA3 as a whole the like-for-like difference is +3.4% (95% range +1.3% to +5.5%). The raw gap is different: C+ homes sold for 5% more per square metre than D–G homes (median £3,293 vs £3,139, 356 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 154 m² against 128 m² for D–G; the most common build period is 2012 onwards for C+ and before 1900 for D–G; 92% of C+ and 93% 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 SA3 1
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| B | 14 | £3,545 |
| C | 34 | £3,178 |
| D | 87 | £3,058 |
| E | 120 | £3,198 |
| F | 81 | £3,352 |
| G | 20 | £3,017 |
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 | 40 | £3,450 | 242 | £3,336 |
| Semi-detached | 4 | — | 45 | £2,250 |
| Terraced | 2 | — | 14 | £3,191 |
| Flat / maisonette | 2 | — | 7 | — |
Compared with the wider area
| Area | Sales | Like-for-like | 95% range |
|---|---|---|---|
| Sector SA3 1 | 356 | too few | — |
| District SA3 | 4,706 | +3.4% | +1.3% to +5.5% |
| England and Wales | 1,000,000 (sample) | +1.2% | +0.9% to +1.5% |
356 of 436 house and flat sales in the sector since 2015 (82%) 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.