EPC rating and sold prices in SL1 (Slough)
In postcode district SL1 (Slough), homes rated EPC C or better sold for 1% more per square metre than D–G homes (median £4,576 vs £4,528, 7,701 sales). Like for like — same size, type, build period and year — the difference is +0.4% (95% range −0.6% to +1.5%): the EPC band itself is not reflected in sale prices here. 0 of 8 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 65 m² against 77 m² for D–G; the most common build period is 2012 onwards for C+ and 1930–1949 for D–G; 19% of C+ and 48% of D–G sales are detached or semi-detached houses.
| Comparing C+ with D–G homes… | Difference | 95% range |
|---|---|---|
| Raw gap per m² (medians) | +1% | — |
| Whole price, nothing held equal | −10.9% | −12.6% to −9.2% |
| Same floor area | −0.8% | −1.9% to +0.3% |
| + same property type | +6.4% | +5.4% to +7.5% |
| + same build period | +2.4% | +1.3% to +3.5% |
| + same year of sale | +0.4% | −0.6% 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 SL1
| Sector | Sales | Raw gap | Like-for-like | 95% range |
|---|---|---|---|---|
| SL1 1 | 749 | +9% | +3.5% | 0.0% to +7.3% |
| SL1 2 | 1,388 | +17% | +2.2% | −0.7% to +5.2% |
| SL1 3 | 1,130 | +8% | +2.4% | −0.6% to +5.5% |
| SL1 4 | 134 | −37% | too few | — |
| SL1 5 | 1,618 | −1% | −0.8% | −2.8% to +1.2% |
| SL1 6 | 947 | −5% | +2.0% | −0.2% to +4.2% |
| SL1 7 | 660 | 0% | −0.6% | −3.8% to +2.8% |
| SL1 8 | 527 | −14% | −4.0% | −8.6% to +0.8% |
| SL1 9 | 548 | +1% | +1.4% | −1.0% to +3.8% |
▲ 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 SL1
| EPC band (last certificate before sale) | Sales | Median £ per m² |
|---|---|---|
| A | 8 | too few |
| B | 1,032 | £4,563 |
| C | 2,660 | £4,592 |
| D | 2,958 | £4,587 |
| E | 842 | £4,386 |
| F | 159 | £4,295 |
| G | 42 | £4,042 |
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.