EPC rating and sold prices in TS23 (Stockton-on-Tees)
In postcode district TS23 (Stockton-on-Tees), homes rated EPC C or better sold for 8% more per square metre than D–G homes (median £1,506 vs £1,393, 3,846 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 1.9% less (95% range −3.4% to −0.4%). 1 of 3 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 84 m² against 84 m² for D–G; both groups are most often built in 1950–1966; 62% of C+ and 68% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +8% | — |
| Whole price, nothing held equal | +4.3% | +1.7% to +6.9% |
| Same floor area | +5.3% | +3.0% to +7.6% |
| + same property type | +6.5% | +4.7% to +8.3% |
| + same build period | +2.3% | +0.6% to +4.0% |
| + same year of sale | −1.9% | −3.4% to −0.4% |
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 TS23
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| TS23 1 | 663 | +9% | −0.5% | −4.3% to +3.4% |
| TS23 2 | 1,120 | +13% | −1.3% | −3.8% to +1.2% |
| TS23 3 | 1,901 | +1% | −2.2% ▼ | −4.2% to −0.2% |
| TS23 4 | 162 | +18% | too few | — |
▲ 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 TS23
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 5 | too few |
| B | 74 | £1,443 |
| C | 1,311 | £1,506 |
| D | 2,053 | £1,420 |
| E | 374 | £1,250 |
| F | 23 | £1,235 |
| G | 6 | too few |
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.