| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Draughtproofing | — | £120 | £125 | 1.0 yrs | +7.2 pts |
| Low energy lighting | — | £40 | £6 | 6.2 yrs | +0.4 pts |
| Flue gas heat recovery | — | £900 | £144 | 6.3 yrs | +8.3 pts |
| Band A condensing boiler | — | £3,000 – £0 | £91 | 16.5 yrs | +5.2 pts · reaches D |
| Floor insulation | — | £6,000 – £0 | £148 | 20.3 yrs | +8.5 pts |
| Solar photovoltaic panels | — | £8,000 – £0 | £137 | 29.2 yrs | +7.9 pts · reaches C |
| Solid wall insulation | — | £14,000 – £0 | £160 | 43.8 yrs | +9.2 pts · reaches B |
| Double glazing | — | £6,500 – £500 | £53 | 50+ yrs | +3.1 pts |
| Wind turbine | — | £25,000 – £0 | £122 | 50+ yrs | +7.1 pts · reaches A |
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 £986 a year — a 3.0% annual return on £32,560.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2015, states £1,560 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £362,830 HPI-indexed estimate, not a valuation
Cave Hill: 11 sales since 1995 · £360,000 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Archbishop Courtenay Primary School | Primary | 0.4 mi | — |
| South Borough Primary School | Primary | 0.5 mi | — |
| St Michael's Church of England Infant School Maidstone | Primary | 0.7 mi | — |
| Maidstone Grammar School | Secondary | 0.8 mi | Progress 8 +0.50 · above average (2023/24) |
| Oakwood Park Grammar School | Secondary | 1.1 mi | Progress 8 +0.62 · well above average (2023/24) |
| New Line Learning Academy | Secondary | 1.1 mi | Progress 8 -0.79 · well below 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.
Cave Hill
How this home sits against its street.