| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Low energy lighting | — | £55 | £21 | 2.7 yrs | +0.2 pts |
| Cavity wall insulation | — | £500 – £1,500 | £353 | 2.8 yrs | +3.8 pts |
| Room-in-roof insulation | — | £1,500 – £2,700 | £652 | 3.2 yrs | +7.0 pts |
| Band A condensing boiler | — | £2,200 – £3,000 | £290 | 9.0 yrs | +3.1 pts · reaches C |
| Solar photovoltaic panels(optional, beyond C) | — | £3,500 – £5,500 | £437 | 10.3 yrs | +4.7 pts |
| Floor insulation(optional, beyond C) | — | £4,000 – £6,000 | £472 | 10.6 yrs | +5.1 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 £1,316 a year — a 22.9% annual return on £5,755.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2021, states £2,826 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £306,981 HPI-indexed estimate, not a valuation
The Polygon: 11 sales since 1995 · £392,000 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Clarendon Road Community Primary School | Primary | 0.1 mi | — |
| St Mary's RC Primary School | Primary | 0.5 mi | — |
| St Andrew's CofE Primary School | Primary | 0.5 mi | — |
| Ellesmere Park High School | Secondary | 0.4 mi | Progress 8 -0.28 · below average (2023/24) |
| All Hallows RC High School | Secondary | 0.8 mi | Progress 8 +0.25 · above average (2023/24) |
| Buile Hill Academy | Secondary | 1.3 mi | Attainment 8 42.9 · no Progress 8 published |
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.
The Polygon
How this home sits against its street.