EPC rating and sold prices in N1 (Islington)
In postcode district N1 (Islington), homes rated EPC C or better sold for 6% less per square metre than D–G homes (median £9,812 vs £10,439, 8,139 sales). Like for like — same size, type, build period and year — the difference is −0.9% (95% range −2.4% to +0.6%): the EPC band itself is not reflected in sale prices here. 0 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 67 m² against 84 m² for D–G; the most common build period is 2012 onwards for C+ and before 1900 for D–G; 1% 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) | −6% | — |
| Whole price, nothing held equal | −28.3% | −30.1% to −26.3% |
| Same floor area | −6.1% | −7.4% to −4.8% |
| + same property type | −1.3% | −2.6% to +0.1% |
| + same build period | +0.2% | −1.3% to +1.7% |
| + same year of sale | −0.9% | −2.4% to +0.6% |
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 N1
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| N1 0 | 599 | −12% | +2.4% | −2.0% to +7.1% |
| N1 1 | 1,025 | 0% | −1.3% | −5.0% to +2.6% |
| N1 2 | 899 | −9% | +0.7% | −3.3% to +4.9% |
| N1 3 | 846 | −8% | −1.4% | −5.0% to +2.2% |
| N1 4 | 894 | −11% | −1.1% | −4.8% to +2.7% |
| N1 5 | 838 | +3% | −1.8% | −8.7% to +5.5% |
| N1 6 | 549 | +11% | +0.8% | −3.5% to +5.3% |
| N1 7 | 1,324 | −4% | +3.5% | −2.4% to +9.7% |
| N1 8 | 704 | −11% | +0.4% | −4.3% to +5.2% |
| N1 9 | 461 | +10% | −1.9% | −7.5% to +4.0% |
▲ 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 N1
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 5 | too few |
| B | 1,827 | £10,283 |
| C | 3,047 | £9,330 |
| D | 2,504 | £10,351 |
| E | 654 | £10,767 |
| F | 80 | £10,600 |
| G | 22 | £9,894 |
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.