Does a C-or-better EPC sell for more in SP5 1 (Wiltshire)?
No premium here: C+ homes sold for slightly less. In postcode sector SP5 1 (Wiltshire), comparing like with like — same floor area, property type, build period and year of sale — homes rated C or better sold for 9.9% less (95% range −17.0% to −2.1%). The raw gap is different: C+ homes sold for 4% less per square metre than D–G homes (median £3,488 vs £3,631, 576 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 155 m² against 116 m² for D–G; the most common build period is 2012 onwards for C+ and 1950–1966 for D–G; 93% of C+ and 91% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | −4% | — |
| Whole price, nothing held equal | +10.1% | −3.4% to +25.4% |
| Same floor area | −3.8% | −11.2% to +4.2% |
| + same property type | −2.2% | −9.0% to +5.2% |
| + same build period | −9.3% | −18.3% to +0.7% |
| + same year of sale | −9.9% | −17.0% 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.
Sold prices by EPC band in SP5 1
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| B | 21 | £3,652 |
| C | 46 | £3,486 |
| D | 232 | £3,622 |
| E | 212 | £3,689 |
| F | 57 | £3,434 |
| G | 8 | too few |
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 | 46 | £3,476 | 352 | £3,750 |
| Semi-detached | 16 | £3,532 | 111 | £3,434 |
| Terraced | 4 | — | 45 | £3,333 |
| Flat / maisonette | 1 | — | 1 | — |
Compared with the wider area
| Area | Sales | Like-for-like | 95% range |
|---|---|---|---|
| Sector SP5 1 | 576 | −9.9% | −17.0% to −2.1% |
| District SP5 | 3,027 | −2.2% | −4.2% to −0.2% |
| England and Wales | 1,000,000 (sample) | +1.2% | +0.9% to +1.5% |
576 of 677 house and flat sales in the sector since 2015 (85%) 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.