EPC rating and sold prices in SL6 (Windsor and Maidenhead)
In postcode district SL6 (Windsor and Maidenhead), homes rated EPC C or better sold for 2% less per square metre than D–G homes (median £5,082 vs £5,202, 12,757 sales). Like for like — same size, type, build period and year — the difference is −0.6% (95% range −1.5% to +0.2%): the EPC band itself is not reflected in sale prices here. 3 of 10 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 94 m² for D–G; the most common build period is 2012 onwards for C+ and 1950–1966 for D–G; 36% of C+ and 66% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | −2% | — |
| Whole price, nothing held equal | −11.5% | −13.1% to −9.9% |
| Same floor area | −3.4% | −4.2% to −2.6% |
| + same property type | +3.1% | +2.2% to +3.9% |
| + same build period | +0.8% | −0.1% to +1.7% |
| + same year of sale | −0.6% | −1.5% to +0.2% |
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 SL6
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| SL6 0 | 1,069 | +2% | −0.6% | −5.0% to +3.9% |
| SL6 1 | 1,465 | +2% | −0.6% | −4.6% to +3.6% |
| SL6 2 | 1,502 | −3% | −2.6% ▼ | −4.6% to −0.5% |
| SL6 3 | 1,367 | −1% | −2.6% ▼ | −4.5% to −0.7% |
| SL6 4 | 1,176 | −1% | +0.4% | −1.8% to +2.7% |
| SL6 5 | 814 | −5% | −3.0% | −6.1% to +0.2% |
| SL6 6 | 1,480 | −3% | −0.1% | −2.2% to +1.9% |
| SL6 7 | 1,615 | −4% | +1.1% | −0.9% to +3.2% |
| SL6 8 | 1,404 | −3% | +2.1% | −0.7% to +4.9% |
| SL6 9 | 865 | −10% | −5.9% ▼ | −9.0% to −2.7% |
▲ 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 SL6
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 7 | too few |
| B | 2,101 | £5,156 |
| C | 3,510 | £5,031 |
| D | 4,974 | £5,204 |
| E | 1,784 | £5,181 |
| F | 336 | £5,249 |
| G | 45 | £5,277 |
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.