| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Draughtproofing | — | £80 – £120 | £132 | 0.8 yrs | +4.5 pts · reaches D |
| Low energy lighting | — | £35 | £7 | 5.1 yrs | +0.2 pts |
| Flue gas heat recovery | — | £900 | £153 | 5.9 yrs | +5.2 pts |
| Floor insulation | — | £800 – £1,200 | £157 | 6.4 yrs | +5.3 pts · reaches C |
| Heating controls | — | £350 – £450 | £57 | 7.0 yrs | +1.9 pts |
| Band A condensing boiler | — | £2,200 – £3,000 | £97 | 26.9 yrs | +3.3 pts |
| Solid wall insulation | — | £4,000 – £14,000 | £170 | 50+ yrs | +5.7 pts |
| Solar photovoltaic panels | — | £9,000 – £14,000 | £145 | 50+ yrs | +4.9 pts · reaches B |
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 £918 a year — a 3.6% annual return on £25,535.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2012, states £1,118 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £541,810 HPI-indexed estimate, not a valuation
West Street: 229 sales since 1995 · £446,397 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Harris Junior Academy Carshalton | Primary | under 0.1 mi | — |
| St Mary's RC Infants School | Primary | 0.3 mi | — |
| Victor Seymour Infants' School | Primary | 0.3 mi | — |
| Carshalton High School for Girls | Secondary | under 0.1 mi | Progress 8 +0.42 · above average (2023/24) |
| St Philomena's Catholic High School for Girls | Secondary | 0.4 mi | Progress 8 +0.68 · well above average (2023/24) |
| Carshalton Boys Sports College | Secondary | 0.6 mi | Progress 8 -0.14 · 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.
West Street
How this home sits against its street.