EPC rating and sold prices in ME9 (Swale)
In postcode district ME9 (Swale), homes rated EPC C or better sold for 1% less per square metre than D–G homes (median £3,393 vs £3,431, 3,677 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 3.4% less (95% range −5.0% to −1.8%). 1 of 3 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 91 m² against 93 m² for D–G; the most common build period is 2012 onwards for C+ and 1950–1966 for D–G; 63% of C+ and 69% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | −1% | — |
| Whole price, nothing held equal | −5.1% | −7.8% to −2.4% |
| Same floor area | −2.9% | −4.6% to −1.3% |
| + same property type | −1.2% | −2.6% to +0.4% |
| + same build period | +0.3% | −1.7% to +2.3% |
| + same year of sale | −3.4% | −5.0% to −1.8% |
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 ME9
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| ME9 0 | 279 | −13% | too few | — |
| ME9 7 | 1,191 | +4% | −1.4% | −4.0% to +1.3% |
| ME9 8 | 1,423 | −8% | −4.3% ▼ | −7.1% to −1.4% |
| ME9 9 | 784 | +1% | −1.7% | −4.4% to +1.0% |
▲ 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 ME9
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 14 | £4,010 |
| B | 710 | £3,426 |
| C | 1,011 | £3,333 |
| D | 1,266 | £3,398 |
| E | 495 | £3,467 |
| F | 138 | £3,640 |
| G | 43 | £4,037 |
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.