| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Draughtproofing | — | £80 – £120 | £181 | 0.6 yrs | +5.0 pts |
| Low energy lighting | — | £35 | £9 | 3.7 yrs | +0.3 pts |
| Cavity wall insulation | — | £500 – £1,500 | £161 | 6.2 yrs | +4.5 pts |
| Flat roof insulation | — | £850 – £1,500 | £163 | 7.2 yrs | +4.5 pts |
| Change of heating system | — | £3,000 – £7,000 | £614 | 8.1 yrs | +17.0 pts · reaches D |
| Floor insulation | — | £4,000 – £6,000 | £215 | 23.2 yrs | +6.0 pts |
| Solar water heating | — | £4,000 – £6,000 | £167 | 29.9 yrs | +4.6 pts |
| Solar photovoltaic panels | — | £5,000 – £8,000 | £199 | 32.6 yrs | +5.5 pts · reaches C |
| Solid wall insulation(optional, beyond C) | — | £4,000 – £14,000 | £233 | 38.7 yrs | +6.4 pts |
| Double glazing(optional, beyond C) | — | £3,300 – £6,500 | £78 | 50+ yrs | +2.2 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 £1,710 a year — a 7.2% annual return on £23,810.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2017, states £2,085 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £187,081 HPI-indexed estimate, not a valuation
Halstead Street: 54 sales since 1995 · £128,617 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| St Joseph and St Bede RC Primary School, a Voluntary Academy | Primary | 0.3 mi | — |
| St John with St Mark CofE Primary School | Primary | 0.3 mi | — |
| Chesham Primary Academy | Primary | 0.3 mi | — |
| Hazel Wood High School | Secondary | 0.8 mi | Progress 8 +0.02 · average (2023/24) |
| St Gabriel's RC High School, a Voluntary Academy | Secondary | 1.3 mi | Progress 8 -0.18 · average (2023/24) |
| Bury Church of England High School | Secondary | 1.4 mi | Progress 8 -0.31 · 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.
Halstead Street
How this home sits against its street.