EPC rating and sold prices in LL18 (Denbighshire)
In postcode district LL18 (Denbighshire), homes rated EPC C or better sold for 17% more per square metre than D–G homes (median £2,110 vs £1,802, 6,750 sales). Like for like — same size, type, build period and year — the difference is +0.5% (95% range −0.9% to +1.9%): the EPC band itself is not reflected in sale prices here. 1 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 85 m² against 81 m² for D–G; the most common build period is 2012 onwards for C+ and 1930–1949 for D–G; 82% of C+ and 86% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +17% | — |
| Whole price, nothing held equal | +20.9% | +18.4% to +23.5% |
| Same floor area | +17.8% | +15.9% to +19.8% |
| + same property type | +20.3% | +18.7% to +22.1% |
| + same build period | +8.1% | +6.2% to +10.1% |
| + same year of sale | +0.5% | −0.9% to +1.9% |
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 LL18
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| LL18 1 | 362 | +22% | too few | — |
| LL18 2 | 1,064 | +10% | −2.1% | −5.7% to +1.6% |
| LL18 3 | 862 | +15% | +3.8% | −0.4% to +8.1% |
| LL18 4 | 2,168 | +17% | +3.2% ▲ | +1.2% to +5.3% |
| LL18 5 | 1,668 | +4% | −1.8% | −4.4% to +0.9% |
| LL18 6 | 626 | +20% | 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 LL18
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 6 | too few |
| B | 477 | £2,187 |
| C | 1,434 | £2,039 |
| D | 3,306 | £1,847 |
| E | 1,165 | £1,714 |
| F | 266 | £1,723 |
| G | 96 | £1,513 |
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.