EPC rating and sold prices in CF24 (Cardiff)
In postcode district CF24 (Cardiff), homes rated EPC C or better sold for 7% more per square metre than D–G homes (median £2,437 vs £2,281, 6,130 sales). Like for like — same size, type, build period and year — the difference is +1.7% (95% range −0.1% to +3.5%): 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 68 m² against 88 m² for D–G; both groups are most often built in 1900–1929; 13% of C+ and 8% 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 | −14.0% | −16.1% to −11.9% |
| Same floor area | −0.2% | −2.0% to +1.6% |
| + same property type | +5.2% | +3.2% to +7.2% |
| + same build period | +7.6% | +5.4% to +9.8% |
| + same year of sale | +1.7% | −0.1% to +3.5% |
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 CF24
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| CF24 0 | 325 | +22% | −0.5% | −5.7% to +5.0% |
| CF24 1 | 707 | +18% | +3.3% | −1.6% to +8.4% |
| CF24 2 | 2,037 | +9% | 0.0% | −2.3% to +2.3% |
| CF24 3 | 1,462 | +8% | +1.6% | −1.7% to +5.0% |
| CF24 4 | 1,588 | +12% | +4.3% ▲ | +0.6% to +8.1% |
▲ 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 CF24
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| B | 125 | £2,200 |
| C | 1,166 | £2,478 |
| D | 3,531 | £2,363 |
| E | 1,134 | £2,051 |
| F | 127 | £1,824 |
| G | 47 | £1,781 |
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.