| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Hot water cylinder insulation | — | £15 – £30 | £179 | 0.1 yrs | +5.1 pts |
| High-retention storage heaters | — | £800 – £1,200 | £412 | 2.4 yrs | +11.8 pts · reaches C |
| Floor insulation(optional, beyond C) | — | £4,000 – £6,000 | £209 | 23.9 yrs | +6.0 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 £590 a year — a 57.7% annual return on £1,023.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2022, states £1,027 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £250,103 HPI-indexed estimate, not a valuation
Mercer Place: 31 sales since 1995 · £319,600 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Pinner Wood School | Primary | 0.1 mi | — |
| Harlyn Primary School | Primary | 0.4 mi | — |
| Hillside Junior School | Primary | 0.7 mi | — |
| Northwood School | Secondary | 0.4 mi | Progress 8 +0.76 · well above average (2023/24) |
| UTC Heathrow | Secondary | 0.4 mi | Progress 8 -1.61 · well below average (2023/24) |
| Haydon School | Secondary | 0.8 mi | Progress 8 -0.19 · 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.
Mercer Place
How this home sits against its street.