EPC rating and sold prices in SO19 (Southampton)
In postcode district SO19 (Southampton), homes rated EPC C or better sold for 4% more per square metre than D–G homes (median £3,027 vs £2,899, 8,872 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 2.0% more (95% range +1.2% to +2.9%). 5 of 9 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 73 m² against 81 m² for D–G; the most common build period is 2012 onwards for C+ and 1930–1949 for D–G; 33% of C+ and 64% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +4% | — |
| Whole price, nothing held equal | −7.7% | −9.1% to −6.2% |
| Same floor area | −0.3% | −1.4% to +0.9% |
| + same property type | +8.7% | +7.7% to +9.8% |
| + same build period | +5.1% | +4.1% to +6.2% |
| + same year of sale | +2.0% | +1.2% to +2.9% |
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 SO19
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| SO19 0 | 442 | +5% | +5.4% ▲ | +1.7% to +9.3% |
| SO19 1 | 470 | +3% | +3.6% ▲ | +1.0% to +6.3% |
| SO19 2 | 1,089 | +6% | +2.2% ▲ | +0.1% to +4.3% |
| SO19 4 | 253 | +2% | +0.8% | −4.1% to +5.9% |
| SO19 5 | 295 | −4% | −2.7% | −7.3% to +2.3% |
| SO19 6 | 811 | −6% | +1.5% | −1.0% to +4.1% |
| SO19 7 | 1,154 | +1% | +3.2% ▲ | +0.5% to +6.0% |
| SO19 8 | 1,516 | +3% | +4.1% ▲ | +2.2% to +6.1% |
| SO19 9 | 2,842 | +11% | +1.1% | −0.6% to +2.9% |
▲ 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 SO19
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 14 | £3,500 |
| B | 997 | £3,098 |
| C | 2,701 | £3,000 |
| D | 3,984 | £2,942 |
| E | 987 | £2,770 |
| F | 145 | £2,604 |
| G | 44 | £2,379 |
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.