EPC rating and sold prices in SW9 (Lambeth)
In postcode district SW9 (Lambeth), homes rated EPC C or better sold for 1% less per square metre than D–G homes (median £7,727 vs £7,778, 4,061 sales). Like for like — same size, type, build period and year — the difference is +0.8% (95% range −1.0% to +2.6%): the EPC band itself is not reflected in sale prices here. 3 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 68 m² against 74 m² for D–G; the most common build period is 2012 onwards for C+ and before 1900 for D–G; 0% of C+ and 5% 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 | −17.3% | −19.6% to −14.9% |
| Same floor area | −5.9% | −7.6% to −4.2% |
| + same property type | −2.1% | −3.8% to −0.3% |
| + same build period | +1.4% | −0.4% to +3.3% |
| + same year of sale | +0.8% | −1.0% to +2.6% |
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 SW9
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| SW9 0 | 1,269 | −3% | −5.4% ▼ | −8.2% to −2.4% |
| SW9 6 | 678 | 0% | −3.2% | −7.0% to +0.8% |
| SW9 7 | 570 | +19% | +3.1% | −2.0% to +8.4% |
| SW9 8 | 464 | +3% | +7.1% ▲ | +1.4% to +13.3% |
| SW9 9 | 1,080 | +2% | +4.9% ▲ | +1.7% to +8.2% |
▲ 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 SW9
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 3 | too few |
| B | 1,309 | £7,868 |
| C | 1,288 | £7,442 |
| D | 1,061 | £7,762 |
| E | 350 | £7,884 |
| F | 39 | £7,362 |
| G | 11 | £7,763 |
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.