| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Flue gas heat recovery | — | £400 – £900 | £92 | 7.0 yrs | +3.8 pts |
| Floor insulation | — | £800 – £1,200 | £95 | 10.5 yrs | +3.9 pts · reaches D |
| Cavity wall insulation | — | £500 – £1,500 | £71 | 14.1 yrs | +2.9 pts |
| Band A condensing boiler | — | £2,200 – £3,000 | £58 | 44.6 yrs | +2.4 pts |
| Solar photovoltaic panels | — | £5,000 – £8,000 | £88 | 50+ yrs | +3.6 pts |
| Solid wall insulation | — | £4,000 – £14,000 | £103 | 50+ yrs | +4.3 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 £507 a year — a 2.4% annual return on £20,750.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2014, states £1,399 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £222,313 HPI-indexed estimate, not a valuation
Sumner Road: 57 sales since 1995 · £254,922 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| St Luke's RC Primary School | Primary | 0.2 mi | — |
| Summerville Primary School | Primary | 0.3 mi | — |
| St John's CofE Primary School | Primary | 0.3 mi | — |
| Buile Hill Academy | Secondary | 0.4 mi | Attainment 8 42.9 · no Progress 8 published |
| All Hallows RC High School | Secondary | 0.6 mi | Progress 8 +0.25 · above average (2023/24) |
| Ellesmere Park High School | Secondary | 1.0 mi | Progress 8 -0.28 · 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.
Sumner Road
How this home sits against its street.