| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Cavity wall insulation | — | £100 – £300 | £143 | 1.4 yrs | +3.5 pts |
| Loft insulation | — | £100 – £300 | £91 | 2.2 yrs | +2.3 pts · reaches D |
| Low energy lighting(optional, beyond D) | — | £45 | £8 | 5.4 yrs | +0.2 pts |
| Band A condensing boiler(optional, beyond D) | — | £1,500 – £3,500 | £118 | 21.3 yrs | +2.9 pts |
| Solar water heating(optional, beyond D) | — | £4,000 – £6,000 | £149 | 33.7 yrs | +3.7 pts |
| Solar photovoltaic panels(optional, beyond D) | — | £11,000 – £20,000 | £177 | 50+ yrs | +4.4 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 £234 a year — a 58.5% annual return on £400.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2012, states £1,182 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £927,140 HPI-indexed estimate, not a valuation
Richmond Drive: 47 sales since 1995 · £873,125 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Cassiobury Junior School | Primary | 0.2 mi | — |
| Cassiobury Infant and Nursery School | Primary | 0.3 mi | — |
| Lanchester Primary School | Primary | 0.5 mi | — |
| Watford Grammar School for Boys | Secondary | 0.7 mi | Progress 8 +0.72 · well above average (2023/24) |
| Croxley Danes School | Secondary | 1.0 mi | Progress 8 +0.10 · average (2023/24) |
| Westfield Academy | Secondary | 1.2 mi | Progress 8 -0.03 · 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.
Richmond Drive
How this home sits against its street.