EPC rating and sold prices in CF63 (Vale of Glamorgan)
In postcode district CF63 (Vale of Glamorgan), homes rated EPC C or better sold for 37% more per square metre than D–G homes (median £2,266 vs £1,656, 3,576 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 1.7% more (95% range +0.2% to +3.3%). 0 of 4 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 79 m² against 89 m² for D–G; the most common build period is 2012 onwards for C+ and 1900–1929 for D–G; 39% of C+ and 27% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +37% | — |
| Whole price, nothing held equal | +16.2% | +13.3% to +19.2% |
| Same floor area | +28.5% | +25.8% to +31.3% |
| + same property type | +24.1% | +21.6% to +26.5% |
| + same build period | +10.3% | +7.9% to +12.7% |
| + same year of sale | +1.7% | +0.2% to +3.3% |
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 CF63
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| CF63 1 | 1,331 | +29% | +2.3% | −0.1% to +4.7% |
| CF63 2 | 726 | +28% | +1.4% | −1.5% to +4.4% |
| CF63 3 | 245 | +24% | +3.9% | −2.7% to +11.0% |
| CF63 4 | 1,274 | +44% | +2.4% | −0.6% to +5.5% |
▲ 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 CF63
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 2 | too few |
| B | 412 | £2,502 |
| C | 1,021 | £2,160 |
| D | 1,647 | £1,753 |
| E | 429 | £1,436 |
| F | 52 | £1,343 |
| G | 13 | £1,210 |
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.