| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Loft insulation | — | £100 – £350 | £112 | 2.0 yrs | +3.1 pts |
| Floor insulation | — | £800 – £1,200 | £235 | 4.3 yrs | +6.5 pts · reaches D |
| Heating controls | — | £350 – £450 | £86 | 4.7 yrs | +2.4 pts |
| Cavity wall insulation | — | £500 – £1,500 | £176 | 5.7 yrs | +4.8 pts |
| Low energy lighting | — | £110 | £10 | 10.7 yrs | +0.3 pts |
| Band A condensing boiler | — | £2,200 – £3,000 | £144 | 18.0 yrs | +4.0 pts |
| Solar water heating | — | £4,000 – £6,000 | £182 | 27.4 yrs | +5.0 pts · reaches C |
| Solar photovoltaic panels(optional, beyond C) | — | £9,000 – £14,000 | £218 | 50+ yrs | +6.0 pts |
Grants verified 20 August 2026. Costs are the register’s indicative ranges. 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 £945 a year — a 9.1% annual return on £10,335.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2013, states £1,577 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £1,110,426 HPI-indexed estimate, not a valuation
Blenheim Gardens: 91 sales since 1995 · £781,992 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Alexandra Primary School | Primary | 0.2 mi | — |
| St Paul's CofE Primary School, Kingston Hill | Primary | 0.3 mi | — |
| St Agatha's Catholic Primary School | Primary | 0.6 mi | — |
| Tiffin School | Secondary | 0.7 mi | Progress 8 +0.86 · well above average (2023/24) |
| Coombe Girls' School | Secondary | 0.9 mi | Progress 8 +0.70 · well above average (2023/24) |
| The Kingston Academy | Secondary | 1.0 mi | Progress 8 +1.16 · well above 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.
Blenheim Gardens
How this home sits against its street.