EPC rating and sold prices in DH6 (County Durham)
In postcode district DH6 (County Durham), homes rated EPC C or better sold for 58% more per square metre than D–G homes (median £1,703 vs £1,077, 6,273 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 3.3% more (95% range +0.8% to +5.9%). 2 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 85 m² against 82 m² for D–G; the most common build period is 2012 onwards for C+ and 1950–1966 for D–G; 72% of C+ and 61% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +58% | — |
| Whole price, nothing held equal | +56.4% | +52.3% to +60.6% |
| Same floor area | +51.0% | +47.6% to +54.4% |
| + same property type | +37.0% | +34.3% to +39.8% |
| + same build period | +8.2% | +5.4% to +11.1% |
| + same year of sale | +3.3% | +0.8% to +5.9% |
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 DH6
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| DH6 1 | 1,170 | +31% | +0.5% | −3.6% to +4.8% |
| DH6 2 | 1,457 | +58% | +5.7% ▲ | +1.0% to +10.6% |
| DH6 3 | 953 | +94% | too few | — |
| DH6 4 | 1,278 | +69% | +1.6% | −3.3% to +6.7% |
| DH6 5 | 1,415 | +62% | +6.7% ▲ | +1.4% to +12.3% |
▲ 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 DH6
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 44 | £1,518 |
| B | 1,667 | £1,896 |
| C | 1,867 | £1,538 |
| D | 2,095 | £1,128 |
| E | 501 | £915 |
| F | 80 | £1,023 |
| G | 19 | £370 |
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.