EPC rating and sold prices in NW11 (Barnet)
In postcode district NW11 (Barnet), homes rated EPC C or better sold for 13% less per square metre than D–G homes (median £7,168 vs £8,207, 2,675 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 5.0% less (95% range −8.4% to −1.4%). 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 91 m² against 130 m² for D–G; the most common build period is 2012 onwards for C+ and 1900–1929 for D–G; 20% of C+ and 62% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | −13% | — |
| Whole price, nothing held equal | −24.8% | −29.1% to −20.2% |
| Same floor area | −8.6% | −11.1% to −6.0% |
| + same property type | +3.0% | −0.2% to +6.3% |
| + same build period | −3.8% | −7.3% to −0.2% |
| + same year of sale | −5.0% | −8.4% to −1.4% |
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 NW11
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| NW11 0 | 328 | −4% | too few | — |
| NW11 6 | 809 | −28% | too few | — |
| NW11 7 | 599 | −13% | −4.1% | −10.0% to +2.1% |
| NW11 8 | 473 | +11% | +3.0% | −2.7% to +8.9% |
| NW11 9 | 466 | −5% | −5.5% | −11.8% to +1.2% |
▲ 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 NW11
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 2 | too few |
| B | 232 | £8,215 |
| C | 487 | £6,783 |
| D | 1,171 | £8,065 |
| E | 657 | £8,404 |
| F | 107 | £8,622 |
| G | 19 | £8,497 |
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.