EPC rating and sold prices in CB23 (South Cambridgeshire)
In postcode district CB23 (South Cambridgeshire), homes rated EPC C or better sold for 9% less per square metre than D–G homes (median £3,507 vs £3,835, 6,503 sales). Like for like — same size, type, build period and year — the difference is −0.6% (95% range −2.0% to +0.9%): the EPC band itself is not reflected in sale prices here. 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 101 m² against 98 m² for D–G; the most common build period is 2012 onwards for C+ and 1967–1975 for D–G; 64% of C+ and 79% 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 | −10.9% | −13.0% to −8.7% |
| Same floor area | −11.1% | −12.3% to −9.9% |
| + same property type | −6.6% | −7.8% to −5.5% |
| + same build period | +2.0% | +0.4% to +3.7% |
| + same year of sale | −0.6% | −2.0% to +0.9% |
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 CB23
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| CB23 1 | 336 | +5% | +5.8% | −0.1% to +12.0% |
| CB23 2 | 221 | +3% | too few | — |
| CB23 3 | 941 | −13% | −7.7% ▼ | −10.9% to −4.4% |
| CB23 4 | 122 | −10% | too few | — |
| CB23 5 | 508 | +11% | +4.7% | −0.1% to +9.9% |
| CB23 6 | 2,124 | +1% | −2.0% | −5.1% to +1.1% |
| CB23 7 | 1,421 | +2% | −0.8% | −3.9% to +2.4% |
| CB23 8 | 830 | −1% | −0.8% | −3.0% to +1.6% |
▲ 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 CB23
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 193 | £4,023 |
| B | 1,902 | £3,594 |
| C | 2,379 | £3,400 |
| D | 1,400 | £3,799 |
| E | 483 | £3,944 |
| F | 127 | £3,915 |
| G | 19 | £3,779 |
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.