EPC rating and sold prices in WA9 (St. Helens)
In postcode district WA9 (St. Helens), homes rated EPC C or better sold for 43% more per square metre than D–G homes (median £2,073 vs £1,448, 7,363 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 3.8% more (95% range +2.1% to +5.5%). 2 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 82 m² against 75 m² for D–G; the most common build period is 2012 onwards for C+ and 1950–1966 for D–G; 68% 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) | +43% | — |
| Whole price, nothing held equal | +52.5% | +49.1% to +55.9% |
| Same floor area | +37.1% | +34.6% to +39.7% |
| + same property type | +28.9% | +26.8% to +31.0% |
| + same build period | +11.5% | +9.2% to +13.8% |
| + same year of sale | +3.8% | +2.1% to +5.5% |
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 WA9
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| WA9 1 | 474 | +40% | +6.8% ▲ | +1.6% to +12.2% |
| WA9 2 | 639 | +41% | +3.8% | −0.3% to +8.1% |
| WA9 3 | 1,922 | +37% | +2.9% | −0.3% to +6.2% |
| WA9 4 | 2,102 | +33% | +0.8% | −1.7% to +3.4% |
| WA9 5 | 2,226 | +43% | +3.6% ▲ | +0.1% to +7.3% |
▲ 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 WA9
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 53 | £2,968 |
| B | 1,546 | £2,381 |
| C | 2,350 | £1,800 |
| D | 2,728 | £1,500 |
| E | 548 | £1,299 |
| F | 100 | £921 |
| G | 38 | £1,303 |
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.