Does a C-or-better EPC sell for more in SA40 9 (Carmarthenshire)?
Too few comparable sales here for a reliable like-for-like figure. In postcode sector SA40 9 (Carmarthenshire), 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 SA40 as a whole the like-for-like difference is +10.4% (95% range −1.0% to +23.1%). The raw gap is bigger: C+ homes sold for 20% more per square metre than D–G homes (median £1,823 vs £1,518, 377 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 130 m² against 105 m² for D–G; the most common build period is 2007–2011 for C+ and before 1900 for D–G; 85% of C+ and 84% 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 SA40 9
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 1 | too few |
| B | 10 | £1,785 |
| C | 22 | £1,792 |
| D | 79 | £1,902 |
| E | 163 | £1,512 |
| F | 71 | £1,287 |
| G | 31 | £1,257 |
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 | 26 | £1,831 | 184 | £1,830 |
| Semi-detached | 2 | — | 106 | £1,351 |
| Terraced | 5 | — | 53 | £1,257 |
| Flat / maisonette | 0 | — | 1 | — |
Compared with the wider area
| Area | Sales | Like-for-like | 95% range |
|---|---|---|---|
| Sector SA40 9 | 377 | too few | — |
| District SA40 | 377 | +10.4% | −1.0% to +23.1% |
| England and Wales | 1,000,000 (sample) | +1.2% | +0.9% to +1.5% |
377 of 420 house and flat sales in the sector since 2015 (90%) 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.