EPC rating and sold prices in IP4 (Ipswich)
In postcode district IP4 (Ipswich), homes rated EPC C or better sold for 5% more per square metre than D–G homes (median £2,771 vs £2,651, 6,393 sales). Like for like — same size, type, build period and year — homes rated C or better sold for 1.3% more (95% range 0.0% to +2.7%). 1 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 86 m² for D–G; the most common build period is 2012 onwards for C+ and 1900–1929 for D–G; 47% of C+ and 61% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +5% | — |
| Whole price, nothing held equal | −0.4% | −3.0% to +2.2% |
| Same floor area | +1.6% | +0.1% to +3.1% |
| + same property type | +8.8% | +7.5% to +10.1% |
| + same build period | +4.2% | +2.7% to +5.7% |
| + same year of sale | +1.3% | 0.0% to +2.7% |
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 IP4
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| IP4 1 | 821 | +15% | +8.1% ▲ | +2.6% to +13.8% |
| IP4 2 | 1,499 | +1% | +1.3% | −2.2% to +4.9% |
| IP4 3 | 678 | −6% | +2.2% | −0.6% to +5.2% |
| IP4 4 | 1,387 | 0% | +2.1% | −0.2% to +4.4% |
| IP4 5 | 2,008 | +9% | +1.1% | −0.5% to +2.8% |
▲ 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 IP4
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 3 | too few |
| B | 474 | £2,667 |
| C | 1,697 | £2,803 |
| D | 2,908 | £2,711 |
| E | 1,063 | £2,515 |
| F | 205 | £2,381 |
| G | 43 | £1,987 |
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.