| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Loft insulation | — | £100 – £350 | £38 | 5.9 yrs | +2.1 pts |
| High-retention storage heaters | — | £800 – £1,200 | £158 | 6.3 yrs | +8.7 pts · reaches C |
| Party wall insulation(optional, beyond C) | — | £300 – £600 | £44 | 10.3 yrs | +2.4 pts |
| Shower heat recovery(optional, beyond C) | — | £585 – £725 | £13 | 49.6 yrs | +0.7 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 £196 a year — a 16.0% annual return on £1,225.
Energy costs as modelled on the certificate, not a bill.
Sold prices
Estimated today: £202,672 HPI-indexed estimate, not a valuation
Chiswell Court: 147 sales since 1995
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Parkgate Junior School | Primary | 0.2 mi | — |
| Knutsford Primary Academy | Primary | 0.3 mi | — |
| Parkgate Infants' and Nursery School | Primary | 0.4 mi | — |
| Queens' School | Secondary | 1.4 mi | Progress 8 +0.20 · average (2023/24) |
| Watford Grammar School for Girls | Secondary | 1.4 mi | Progress 8 +0.74 · well above average (2023/24) |
| Watford Grammar School for Boys | Secondary | 1.5 mi | Progress 8 +0.72 · 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 E01023858, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.
Chiswell Court
How this home sits against its street.