EPC rating and sold prices in SW3 (Kensington and Chelsea)
In postcode district SW3 (Kensington and Chelsea), homes rated EPC C or better sold for 7% less per square metre than D–G homes (median £17,439 vs £18,750, 2,720 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 6.2% more (95% range +3.1% to +9.4%). 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 72 m² against 109 m² for D–G; both groups are most often built before 1900; 0% of C+ and 3% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | −7% | — |
| Whole price, nothing held equal | −34.2% | −38.8% to −29.2% |
| Same floor area | +3.5% | +0.5% to +6.7% |
| + same property type | +6.5% | +3.3% to +9.7% |
| + same build period | +5.7% | +2.5% to +8.9% |
| + same year of sale | +6.2% | +3.1% to +9.4% |
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 SW3
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| SW3 1 | 117 | −3% | too few | — |
| SW3 2 | 487 | 0% | +4.7% | −2.2% to +11.9% |
| SW3 3 | 589 | −10% | +0.6% | −4.5% to +5.9% |
| SW3 4 | 559 | 0% | too few | — |
| SW3 5 | 656 | −4% | +4.5% | −2.0% to +11.4% |
| SW3 6 | 312 | −13% | too few | — |
▲ 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 SW3
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| B | 56 | £21,519 |
| C | 923 | £17,218 |
| D | 1,208 | £18,670 |
| E | 440 | £19,312 |
| F | 79 | £18,068 |
| G | 14 | £16,373 |
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.