EPC rating and sold prices in CB9 (West Suffolk)
In postcode district CB9 (West Suffolk), homes rated EPC C or better sold for 9% more per square metre than D–G homes (median £3,176 vs £2,917, 5,458 sales). Like for like — same size, type, build period and year — the difference is −0.3% (95% range −1.4% to +0.8%): the EPC band itself is not reflected in sale prices here. 1 of 4 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 87 m² against 85 m² for D–G; the most common build period is 2012 onwards for C+ and 1967–1975 for D–G; 53% of C+ and 58% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +9% | — |
| Whole price, nothing held equal | +7.2% | +5.2% to +9.3% |
| Same floor area | +6.7% | +5.4% to +8.1% |
| + same property type | +8.4% | +7.2% to +9.6% |
| + same build period | +2.9% | +1.6% to +4.2% |
| + same year of sale | −0.3% | −1.4% to +0.8% |
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 CB9
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| CB9 0 | 1,098 | +2% | −0.7% | −2.4% to +1.0% |
| CB9 7 | 2,119 | +5% | −2.0% ▼ | −3.7% to −0.2% |
| CB9 8 | 780 | +19% | +1.9% | −1.2% to +5.0% |
| CB9 9 | 1,461 | +8% | +1.3% | −0.8% to +3.5% |
▲ 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 CB9
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 77 | £3,437 |
| B | 980 | £3,426 |
| C | 1,786 | £3,000 |
| D | 2,089 | £2,940 |
| E | 435 | £2,812 |
| F | 79 | £2,917 |
| G | 12 | £2,185 |
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.