EPC rating and sold prices in LL53 (Gwynedd)
In postcode district LL53 (Gwynedd), homes rated EPC C or better sold for 8% less per square metre than D–G homes (median £2,189 vs £2,386, 2,244 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 6.2% less (95% range −11.7% to −0.3%). 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 109 m² against 94 m² for D–G; the most common build period is 2012 onwards for C+ and before 1900 for D–G; 55% of C+ and 66% 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 | +9.5% | +2.5% to +16.9% |
| Same floor area | −1.8% | −6.6% to +3.2% |
| + same property type | +8.1% | +2.7% to +13.8% |
| + same build period | −2.9% | −9.1% to +3.6% |
| + same year of sale | −6.2% | −11.7% to −0.3% |
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 LL53
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| LL53 5 | 564 | +14% | too few | — |
| LL53 6 | 710 | +4% | too few | — |
| LL53 7 | 672 | +7% | too few | — |
| LL53 8 | 298 | +9% | 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 LL53
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 8 | too few |
| B | 129 | £2,290 |
| C | 195 | £2,110 |
| D | 513 | £2,344 |
| E | 709 | £2,419 |
| F | 470 | £2,353 |
| G | 220 | £2,335 |
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.