EPC rating and sold prices in CF64 (Vale of Glamorgan)
In postcode district CF64 (Vale of Glamorgan), homes rated EPC C or better sold for 7% more per square metre than D–G homes (median £3,253 vs £3,042, 7,112 sales). Like for like — same size, type, build period and year — the difference is +1.1% (95% range −0.3% to +2.6%): the EPC band itself is not reflected in sale prices here. 1 of 5 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 86 m² against 97 m² for D–G; the most common build period is 2012 onwards for C+ and 1900–1929 for D–G; 47% of C+ and 53% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +7% | — |
| Whole price, nothing held equal | −7.9% | −10.1% to −5.7% |
| Same floor area | +6.3% | +4.9% to +7.6% |
| + same property type | +6.0% | +4.6% to +7.3% |
| + same build period | +5.4% | +3.7% to +7.1% |
| + same year of sale | +1.1% | −0.3% to +2.6% |
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 CF64
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| CF64 1 | 1,621 | +9% | +0.4% | −2.9% to +3.7% |
| CF64 2 | 1,480 | +3% | +2.3% | −0.5% to +5.2% |
| CF64 3 | 1,345 | −1% | −3.2% ▼ | −6.2% to −0.2% |
| CF64 4 | 1,419 | +14% | −1.2% | −3.8% to +1.5% |
| CF64 5 | 1,247 | +12% | +1.8% | −1.1% to +4.9% |
▲ 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 CF64
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 20 | £3,835 |
| B | 1,162 | £3,328 |
| C | 2,111 | £3,190 |
| D | 2,901 | £3,094 |
| E | 761 | £2,957 |
| F | 128 | £2,722 |
| G | 29 | £2,569 |
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.