| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Draughtproofing | — | £150 – £250 | £142 | 1.4 yrs | +3.3 pts |
| Floor insulation | — | £5,000 – £10,000 | £168 | 44.6 yrs | +4.0 pts · reaches C |
| Solid wall insulation(optional, beyond C) | — | £7,500 – £11,000 | £182 | 50+ yrs | +4.3 pts |
| Double glazing(optional, beyond C) | — | £4,500 – £6,000 | £61 | 50+ yrs | +1.4 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 £310 a year — a 4.0% annual return on £7,700.
Energy costs as modelled on the certificate, not a bill.
Sold prices
Estimated today: £285,498 HPI-indexed estimate, not a valuation
Castle Terrace: 2 sales since 1995
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| William Gilbert Endowed Church of England Primary School | Primary | under 0.1 mi | — |
| Duffield the Meadows Primary School | Primary | 0.4 mi | — |
| Milford Primary School | Primary | 0.9 mi | — |
| The Ecclesbourne School | Secondary | 0.3 mi | Progress 8 +0.41 · above average (2023/24) |
| Allestree Woodlands School | Secondary | 2.6 mi | Progress 8 -0.21 · below average (2023/24) |
| Belper School and Sixth Form Centre | Secondary | 2.8 mi | Progress 8 -0.31 · below 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 E01019427, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.