Does a C-or-better EPC sell for more in DL4 1 (County Durham)?
Too few comparable sales here for a reliable like-for-like figure. In postcode sector DL4 1 (County Durham), comparing like with like — same floor area, property type, build period and year of sale — there are too few comparable sales in each group for a reliable figure; for district DL4 as a whole the like-for-like difference is +4.6% (95% range −0.5% to +9.9%). The raw gap is bigger: C+ homes sold for 59% more per square metre than D–G homes (median £1,106 vs £696, 709 sales 2015–2026), mostly because they are different homes. Across England and Wales the like-for-like figure is +1.2%. Data: HM Land Registry Price Paid to 30 September 2026 matched to the 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 85 m² for D–G; both groups are most often built in 1900–1929; 43% of C+ and 25% of D–G sales are detached or semi-detached houses.
This sector has fewer than 150 matched sales, fewer than 30 in one group, or an estimate too imprecise or implausibly large to trust, so the like-for-like comparison is not shown; the district figure is above.
Sold prices by EPC band in DL4 1
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 1 | too few |
| B | 18 | £1,418 |
| C | 155 | £1,051 |
| D | 354 | £739 |
| E | 153 | £667 |
| F | 19 | £620 |
| G | 9 | too few |
A median is shown when a band has at least 10 sales.
C or better vs D–G, by property type
| Type | C+ sales | C+ £/m² | D–G sales | D–G £/m² |
|---|---|---|---|---|
| Detached | 34 | £1,692 | 44 | £1,612 |
| Semi-detached | 40 | £1,380 | 91 | £1,136 |
| Terraced | 92 | £859 | 399 | £641 |
| Flat / maisonette | 8 | — | 1 | — |
Compared with the wider area
| Area | Sales | Like-for-like | 95% range |
|---|---|---|---|
| Sector DL4 1 | 709 | too few | — |
| District DL4 | 1,698 | +4.6% | −0.5% to +9.9% |
| England and Wales | 1,000,000 (sample) | +1.2% | +0.9% to +1.5% |
Average gas use in DL4 1 (2024): meters vs certificates
A rough comparison: the certificate figure is an upper-bound estimate (primary energy including lighting, converted with one factor), so treat the share as an order of magnitude.
| Postcodes with published gas data (5+ meters) | 112 (2,185 meters) |
|---|---|
| Median gas use per meter (median of postcodes) | 10,624 kWh |
| Gas-heated homes with an EPC | 1,649 |
| Energy implied by their certificates (median) | 17,968 kWh |
| Metered gas as a share of the certificate figure (median of 110 postcodes) | 53% (middle half 45%–68%) |
Certificates by band imply: B 7,096 kWh (53 homes) · C 13,728 kWh (608 homes) · D 20,040 kWh (752 homes) · E 31,175 kWh (212 homes) · F 43,781 kWh (18 homes). Across England and Wales, real use is much closer to the certificate for A–C homes than for D–G homes, so the saving an upgrade promises is usually smaller than the certificate suggests.
Certificate energy = primary energy per m² × floor area ÷ 1.13, for homes whose latest certificate shows mains gas heating; it also covers lighting and other uses, so it is an upper bound for gas. DESNZ gas is weather-corrected and covers all meters in the postcode, with or without a certificate.
Can the local grid take heat pumps in DL4 1?
About 1,360 of the 1,517 gas-heated homes with an energy certificate in DL4 1 (90%) could switch to a heat pump before their local substations run out of spare capacity, on Northern Powergrid's figures. 6 of the 18 local substations would fill up before every gas-heated home they supply could switch.
| Local (street) substations serving homes in the sector | 18 |
|---|---|
| Already at or over capacity | 0 (0%) |
| Their combined spare capacity (demand headroom) | ≈ 5,940 kVA |
| Heat pumps that spare capacity could take, at 1.7 kW each | ≈ 3,500 |
| Gas-heated homes with an EPC on these substations | 1,517 (92% of the sector's) |
| Of them, could switch within the spare capacity | ≈ 1,360 (90%) |
| …if each heat pump adds 3 kW (a cold snap) | ≈ 1,110 (73%) |
How: each substation's spare capacity (transformer headroom in kW, from last year's maximum demand) is divided by 1.7 kW, the extra winter peak one heat pump adds once many are spread over a street; a substation can take as many heat pumps as that allows, shared among the gas-heated homes on all its postcodes listed by Northern Powergrid as fed by the substation. Some substations also serve neighbouring sectors, so their whole capacity is counted here and there. Spare capacity is Northern Powergrid's figure as published on 3 August 2026; network operators must still be told about each heat pump, and a full substation means reinforcement (usually a delay), not a refusal. Homes without an energy certificate are not counted. All areas and the method.
Supported by Northern Powergrid Open Data.
709 of 747 house and flat sales in the sector since 2015 (95%) were matched to a certificate.
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.