EPC rating and sold prices in DL14 (County Durham)
In postcode district DL14 (County Durham), homes rated EPC C or better sold for 55% more per square metre than D–G homes (median £1,531 vs £985, 6,566 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 3.5% less (95% range −5.7% to −1.2%). 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 84 m² against 88 m² for D–G; the most common build period is 2012 onwards for C+ and 1900–1929 for D–G; 63% of C+ and 41% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +55% | — |
| Whole price, nothing held equal | +37.3% | +33.1% to +41.6% |
| Same floor area | +43.7% | +40.1% to +47.4% |
| + same property type | +18.4% | +15.9% to +20.9% |
| + same build period | +0.9% | −1.6% to +3.4% |
| + same year of sale | −3.5% | −5.7% to −1.2% |
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 DL14
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| DL14 0 | 1,131 | +13% | −7.6% ▼ | −11.0% to −4.0% |
| DL14 6 | 1,621 | +27% | −3.1% | −6.7% to +0.7% |
| DL14 7 | 890 | +74% | +3.0% | −3.5% to +10.0% |
| DL14 8 | 1,631 | +173% | +2.5% | −3.1% to +8.5% |
| DL14 9 | 1,293 | +71% | −1.3% | −6.2% to +3.7% |
▲ 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 DL14
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 16 | £2,196 |
| B | 659 | £1,855 |
| C | 2,041 | £1,407 |
| D | 2,738 | £1,047 |
| E | 837 | £862 |
| F | 199 | £769 |
| G | 76 | £500 |
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.