| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| High-retention storage heaters | — | £1,200 – £200 | £430 | 1.6 yrs | +18.4 pts · reaches E |
| High-performance doors | — | £1,000 – £0 | £175 | 2.9 yrs | +7.5 pts |
| Flat roof insulation | — | £1,500 – £500 | £166 | 6.0 yrs | +7.1 pts · reaches D |
| Solid wall insulation(optional, beyond D) | — | £14,000 – £0 | £236 | 29.6 yrs | +10.1 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 £771 a year — a 35.0% annual return on £2,200.
Energy costs as modelled on the certificate, not a bill. This fuel has too few recent certificates to restate at today's prices.
Sold prices
Estimated today: £288,707 HPI-indexed estimate, not a valuation
The Oval: 45 sales since 1995 · £511,000 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Days Lane Primary School | Primary | 0.3 mi | — |
| Chatsworth Infant School | Primary | 0.4 mi | — |
| Sherwood Park Primary School | Primary | 0.4 mi | — |
| Blackfen School for Girls | Secondary | 0.5 mi | Progress 8 -0.14 · average (2023/24) |
| Hurstmere School | Secondary | 0.6 mi | Attainment 8 42.1 · no Progress 8 published |
| Chislehurst and Sidcup Grammar School | Secondary | 0.7 mi | Progress 8 +0.82 · well above 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 E01000350, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.
The Oval
How this home sits against its street.