| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Low energy lighting | — | £55 | £9 | 6.5 yrs | +0.4 pts |
| Cavity wall insulation | — | £500 – £1,500 | £145 | 6.9 yrs | +6.2 pts |
| Floor insulation | — | £4,000 – £6,000 | £194 | 25.7 yrs | +8.3 pts · reaches C |
| Solar water heating | — | £4,000 – £6,000 | £151 | 33.1 yrs | +6.4 pts |
| Solar photovoltaic panels | — | £5,000 – £8,000 | £180 | 36.1 yrs | +7.7 pts · reaches B |
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 £679 a year — a 3.9% annual return on £17,555.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2016, states £1,144 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £241,069 HPI-indexed estimate, not a valuation
Chalfont Close: 16 sales since 1995 · £206,500 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Alexandra Park Junior School | Primary | 0.3 mi | — |
| Roundthorn Primary Academy | Primary | 0.4 mi | — |
| Glodwick Infant and Nursery School | Primary | 0.4 mi | — |
| Oasis Academy Leesbrook | Secondary | 0.6 mi | Progress 8 +0.12 · average (2023/24) |
| The Hathershaw College | Secondary | 1.0 mi | Progress 8 -0.23 · below average (2023/24) |
| The Blue Coat CofE School | Secondary | 1.3 mi | Progress 8 +0.50 · 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.
Chalfont Close
How this home sits against its street.