EPC rating and sold prices in DA1 (Dartford)
In postcode district DA1 (Dartford), homes rated EPC C or better sold for 5% less per square metre than D–G homes (median £3,945 vs £4,137, 11,220 sales). Like for like — same size, type, build period and year — the difference is −0.3% (95% range −1.2% to +0.6%): the EPC band itself is not reflected in sale prices here. 2 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 71 m² against 77 m² for D–G; the most common build period is 2012 onwards for C+ and 1930–1949 for D–G; 17% of C+ and 39% 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 | −10.4% | −11.6% to −9.3% |
| Same floor area | −6.7% | −7.5% to −6.0% |
| + same property type | +2.0% | +1.2% to +2.8% |
| + same build period | +3.0% | +1.9% to +4.1% |
| + same year of sale | −0.3% | −1.2% to +0.6% |
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 DA1
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| DA1 1 | 1,956 | +9% | +1.8% ▲ | +0.1% to +3.5% |
| DA1 2 | 1,863 | −2% | +0.2% | −1.7% to +2.1% |
| DA1 3 | 1,616 | +1% | −0.4% | −2.1% to +1.4% |
| DA1 4 | 1,612 | +3% | +4.0% ▲ | +1.9% to +6.1% |
| DA1 5 | 4,173 | −4% | 0.0% | −1.7% to +1.7% |
▲ 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 DA1
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 8 | too few |
| B | 3,798 | £3,783 |
| C | 2,298 | £4,193 |
| D | 3,722 | £4,200 |
| E | 1,187 | £3,972 |
| F | 173 | £4,044 |
| G | 34 | £3,372 |
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.