| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Floor insulation | — | £800 – £1,200 | £191 | 5.2 yrs | +5.2 pts · reaches D |
| Heating controls | — | £350 – £450 | £70 | 5.7 yrs | +1.9 pts |
| Cavity wall insulation | — | £500 – £1,500 | £143 | 7.0 yrs | +3.9 pts |
| Room-in-roof insulation | — | £1,500 – £2,700 | £264 | 8.0 yrs | +7.2 pts |
| Low energy lighting | — | £70 | £8 | 8.4 yrs | +0.2 pts |
| Solar photovoltaic panels | — | £5,000 – £8,000 | £177 | 36.7 yrs | +4.8 pts · reaches C |
| Solid wall insulation(optional, beyond C) | — | £4,000 – £14,000 | £207 | 43.6 yrs | +5.7 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 £852 a year — a 7.7% annual return on £11,070.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2017, states £1,666 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £320,389 HPI-indexed estimate, not a valuation
Knoll Street: 27 sales since 1995 · £196,667 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Brentnall Academy | Primary | 0.2 mi | — |
| St Boniface RC Primary School | Primary | 0.3 mi | — |
| Broughton Jewish Cassel Fox Primary School | Primary | 0.3 mi | — |
| Beis Yaakov High School | Secondary | 0.3 mi | Progress 8 +0.88 · well above average (2023/24) |
| The King David High School | Secondary | 1.0 mi | Progress 8 +0.50 · above average (2023/24) |
| The Albion Academy | Secondary | 1.0 mi | Progress 8 -0.04 · 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.
Knoll Street
How this home sits against its street.