EPC rating and sold prices in PO1 (Portsmouth)
In postcode district PO1 (Portsmouth), homes rated EPC C or better sold for 29% more per square metre than D–G homes (median £3,188 vs £2,472, 3,238 sales). Like for like — same size, type, build period and year — the difference is −0.1% (95% range −2.5% to +2.3%): the EPC band itself is not reflected in sale prices here. 3 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 69 m² against 78 m² for D–G; both groups are most often built in 1900–1929; 1% of C+ and 2% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +29% | — |
| Whole price, nothing held equal | +5.6% | +2.4% to +9.0% |
| Same floor area | +17.9% | +14.9% to +20.9% |
| + same property type | +14.9% | +11.8% to +18.1% |
| + same build period | +3.2% | +0.6% to +5.9% |
| + same year of sale | −0.1% | −2.5% to +2.3% |
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 PO1
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| PO1 1 | 136 | +6% | too few | — |
| PO1 2 | 666 | +6% | +1.4% | −1.9% to +4.7% |
| PO1 3 | 599 | +1% | −8.7% ▼ | −15.9% to −0.9% |
| PO1 4 | 158 | +2% | +8.5% ▲ | +1.5% to +15.9% |
| PO1 5 | 1,679 | +9% | +2.2% ▲ | +0.3% 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 PO1
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 1 | too few |
| B | 311 | £3,333 |
| C | 1,097 | £3,103 |
| D | 1,445 | £2,534 |
| E | 331 | £2,312 |
| F | 39 | £2,188 |
| G | 14 | £2,100 |
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.