EPC rating and sold prices in SW1P (Westminster)
In postcode district SW1P (Westminster), homes rated EPC C or better sold for 19% more per square metre than D–G homes (median £13,462 vs £11,267, 1,505 sales). Like for like — same size, type, build period and year — the difference is +3.0% (95% range −0.3% to +6.4%): the EPC band itself is not reflected in sale prices here. 0 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 78 m² against 70 m² for D–G; the most common build period is 2012 onwards for C+ and before 1900 for D–G; 0% of C+ and 0% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +19% | — |
| Whole price, nothing held equal | +27.3% | +19.2% to +36.0% |
| Same floor area | +21.7% | +18.0% to +25.5% |
| + same property type | +23.0% | +19.1% to +26.9% |
| + same build period | +1.5% | −1.8% to +5.0% |
| + same year of sale | +3.0% | −0.3% to +6.4% |
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 SW1P
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| SW1P 1 | 266 | +3% | +4.6% | −1.8% to +11.5% |
| SW1P 2 | 328 | +10% | +1.4% | −5.5% to +8.9% |
| SW1P 3 | 198 | +37% | too few | — |
| SW1P 4 | 713 | +25% | +2.9% | −0.9% to +6.9% |
▲ 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 SW1P
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| B | 452 | £17,000 |
| C | 507 | £11,442 |
| D | 400 | £11,234 |
| E | 121 | £11,528 |
| F | 20 | £11,468 |
| G | 5 | too few |
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.