| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Flat roof insulation | — | £900 – £1,200 | £93 | 11.2 yrs | +3.2 pts |
| Loft insulation | — | £900 – £1,200 | £59 | 17.9 yrs | +2.0 pts |
| Floor insulation | — | £5,000 – £10,000 | £123 | 50+ yrs | +4.2 pts · reaches C |
| Solid wall insulation(optional, beyond C) | — | £7,500 – £11,000 | £133 | 50+ yrs | +4.6 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 £275 a year — a 2.9% annual return on £9,600.
Energy costs as modelled on the certificate, not a bill.
Sold prices
Estimated today: £317,537 HPI-indexed estimate, not a valuation
Chalfont Road: 132 sales since 1995 · £330,723 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| St Mark's Church of England Primary Academy | Primary | 0.3 mi | — |
| South Norwood Primary | Primary | 0.5 mi | — |
| Cypress Primary School | Primary | 0.5 mi | — |
| Harris Academy South Norwood | Secondary | 0.1 mi | Progress 8 +0.45 · above average (2023/24) |
| Harris City Academy Crystal Palace | Secondary | 0.7 mi | Progress 8 +0.24 · above average (2023/24) |
| Oasis Academy Arena | Secondary | 0.9 mi | Progress 8 -0.50 · 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.
Area context
Police-recorded crime for the wider neighbourhood, not this address. We grade homes, never neighbourhoods — so this is reported as a count, not a rating.
Police.uk street-level data for LSOA E01001142, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.
Chalfont Road
How this home sits against its street.