EPC rating and sold prices in BB1 (Blackburn with Darwen)
In postcode district BB1 (Blackburn with Darwen), homes rated EPC C or better sold for 28% more per square metre than D–G homes (median £1,905 vs £1,486, 7,257 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 2.7% more (95% range +0.8% to +4.6%). 1 of 6 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 86 m² against 86 m² for D–G; the most common build period is 2012 onwards for C+ and 1900–1929 for D–G; 62% of C+ and 53% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +28% | — |
| Whole price, nothing held equal | +24.4% | +21.2% to +27.6% |
| Same floor area | +24.5% | +22.0% to +27.0% |
| + same property type | +13.4% | +11.5% to +15.3% |
| + same build period | +7.8% | +5.6% to +10.1% |
| + same year of sale | +2.7% | +0.8% to +4.6% |
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 BB1
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| BB1 1 | 527 | +28% | +5.4% | −0.2% to +11.3% |
| BB1 2 | 1,034 | +5% | +0.8% | −3.4% to +5.2% |
| BB1 3 | 323 | +15% | too few | — |
| BB1 4 | 1,164 | +50% | −2.0% | −6.3% to +2.4% |
| BB1 5 | 619 | +11% | +4.8% | −0.9% to +10.9% |
| BB1 6 | 135 | +31% | too few | — |
| BB1 7 | 118 | +19% | too few | — |
| BB1 8 | 1,542 | +46% | +4.7% ▲ | +1.0% to +8.6% |
| BB1 9 | 1,795 | +12% | +3.6% | −0.1% to +7.4% |
▲ 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 BB1
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 11 | £2,571 |
| B | 715 | £2,314 |
| C | 1,363 | £1,610 |
| D | 3,685 | £1,554 |
| E | 1,175 | £1,341 |
| F | 240 | £1,282 |
| G | 68 | £958 |
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.