EPC rating and sold prices in NP20 (Newport)
In postcode district NP20 (Newport), homes rated EPC C or better sold for 18% more per square metre than D–G homes (median £2,200 vs £1,860, 7,605 sales). Like for like — same size, type, build period and year — the difference is 0.0% (95% range −1.4% to +1.5%): the EPC band itself is not reflected in sale prices here. 2 of 5 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 88 m² for D–G; the most common build period is 2012 onwards for C+ and 1900–1929 for D–G; 56% of C+ and 54% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +18% | — |
| Whole price, nothing held equal | +8.8% | +6.5% to +11.2% |
| Same floor area | +17.2% | +15.5% to +19.0% |
| + same property type | +11.4% | +9.9% to +13.0% |
| + same build period | +5.5% | +3.6% to +7.4% |
| + same year of sale | 0.0% | −1.4% to +1.5% |
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 NP20
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| NP20 1 | 54 | +15% | too few | — |
| NP20 2 | 1,296 | +73% | too few | — |
| NP20 3 | 1,677 | +3% | +3.0% ▲ | +0.4% to +5.7% |
| NP20 4 | 961 | +18% | +2.8% | −2.0% to +7.8% |
| NP20 5 | 1,694 | +20% | +0.4% | −2.7% to +3.5% |
| NP20 6 | 1,134 | +2% | −4.0% ▼ | −6.5% to −1.4% |
| NP20 7 | 789 | +32% | +3.1% | −0.1% to +6.3% |
▲ 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 NP20
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 42 | £3,385 |
| B | 1,225 | £2,292 |
| C | 2,041 | £2,055 |
| D | 3,223 | £1,910 |
| E | 921 | £1,684 |
| F | 128 | £1,681 |
| G | 25 | £1,401 |
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.