| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Hot water cylinder insulation | — | £15 – £30 | £84 | 0.3 yrs | +3.4 pts |
| High-performance doors | — | £1,000 – £0 | £78 | 6.4 yrs | +3.2 pts |
| Change of heating system | — | £3,000 – £7,000 | £279 | 17.9 yrs | +11.5 pts · reaches D |
| Solar photovoltaic panels | — | £3,500 – £5,500 | £91 | 49.7 yrs | +3.7 pts |
| Floor insulation | — | £4,000 – £6,000 | £98 | 50+ yrs | +4.0 pts |
| Solar water heating | — | £4,000 – £6,000 | £76 | 50+ yrs | +3.1 pts · reaches C |
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 £705 a year — a 3.5% annual return on £20,023.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2021, states £1,332 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £237,329 HPI-indexed estimate, not a valuation
Crown Drive: 69 sales since 1995 · £186,558 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| St Paul's Community Primary and Nursery School, Spalding | Primary | 0.2 mi | — |
| Spalding Parish Church of England Day School | Primary | 1.2 mi | — |
| Spalding Primary Academy | Primary | 1.2 mi | — |
| Spalding Academy | Secondary | 0.8 mi | Progress 8 +0.42 · above average (2023/24) |
| Spalding High School | Secondary | 1.1 mi | Progress 8 +0.63 · well above average (2023/24) |
| Spalding Grammar School | Secondary | 1.3 mi | Progress 8 +0.30 · 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.
Crown Drive
How this home sits against its street.