EPC rating and sold prices in CF14 (Cardiff)
In postcode district CF14 (Cardiff), homes rated EPC C or better sold for 5% more per square metre than D–G homes (median £3,167 vs £3,030, 12,673 sales). Like for like — same size, type, build period and year — the difference is −0.2% (95% range −1.1% to +0.7%): the EPC band itself is not reflected in sale prices here. 2 of 9 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 90 m² against 96 m² for D–G; the most common build period is 2012 onwards for C+ and 1930–1949 for D–G; 49% of C+ and 63% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +5% | — |
| Whole price, nothing held equal | −3.9% | −5.6% to −2.1% |
| Same floor area | +3.5% | +2.4% to +4.6% |
| + same property type | +7.3% | +6.3% to +8.2% |
| + same build period | +5.7% | +4.6% to +6.9% |
| + same year of sale | −0.2% | −1.1% to +0.7% |
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 CF14
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| CF14 0 | 1,439 | +22% | +2.8% ▲ | +0.1% to +5.5% |
| CF14 1 | 1,619 | +3% | +2.9% ▲ | +0.9% to +5.0% |
| CF14 2 | 1,616 | +2% | +1.5% | −1.2% to +4.2% |
| CF14 3 | 1,102 | +14% | −0.9% | −4.4% to +2.7% |
| CF14 4 | 1,569 | −10% | +1.5% | −0.8% to +3.9% |
| CF14 5 | 1,576 | +13% | −1.3% | −3.9% to +1.4% |
| CF14 6 | 1,782 | −10% | −0.5% | −2.7% to +1.8% |
| CF14 7 | 636 | −7% | +1.1% | −2.5% to +4.9% |
| CF14 9 | 1,334 | +6% | +1.3% | −0.3% to +3.0% |
▲ 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 CF14
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 7 | too few |
| B | 1,104 | £3,701 |
| C | 3,853 | £3,031 |
| D | 5,997 | £3,077 |
| E | 1,488 | £2,890 |
| F | 176 | £2,802 |
| G | 48 | £2,789 |
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.