| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Loft insulation | — | £225typical | £58 | 3.9 yrs | +2.1 pts |
| High-retention storage heaters | — | £1,000 – £1,500typical | £242 | 5.2 yrs | +8.5 pts · reaches D |
| Wind turbine | — | £2,750typical | £102 | 27.0 yrs | +3.6 pts |
| Solar photovoltaic panels | — | £4,500 – £6,500typical | £114 | 48.4 yrs | +4.0 pts |
| Solar water heating | — | £5,000typical | £95 | 50+ yrs | +3.3 pts |
| Double glazing | — | £1,200 – £4,900typical | £44 | 50+ yrs | +1.6 pts · reaches C |
Grants verified 20 August 2026. Costs are the register’s indicative ranges, except where marked typical, which this certificate did not price and which are taken instead from comparable homes of the same type. Savings are restated at the fuel prices assumed in July 2026. Points per measure are estimated from 19.9 million certificates and rescaled to this home’s own certificate delta; the total is the register’s figure.
Running costs
The full plan saves £655 a year — a 3.7% annual return on £17,775.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2009, states £629 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £354,492 HPI-indexed estimate, not a valuation
Windmill Road: 142 sales since 1995 · £607,625 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Hampton Hill Junior School | Primary | 0.1 mi | — |
| Carlisle Infant School | Primary | 0.3 mi | — |
| Stanley Primary School | Primary | 0.8 mi | — |
| Hampton High | Secondary | 0.7 mi | Progress 8 -0.32 · below average (2023/24) |
| Waldegrave School | Secondary | 1.0 mi | Progress 8 +0.78 · well above average (2023/24) |
| Twickenham School | Secondary | 1.3 mi | Progress 8 +0.20 · average (2023/24) |
Schools from the DfE register, performance from the KS4 performance tables. Progress 8 is a GCSE measure, so primaries have none. Distance is straight-line from the postcode, not a catchment: admission is decided by the school, not by us.
Area context
Police-recorded crime for the wider neighbourhood, not this address. We grade homes, never neighbourhoods — so this is reported as a count, not a rating.
Police.uk street-level data for LSOA E01003815, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.
Windmill Road
How this home sits against its street.