| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Flat roof insulation | — | £850 – £1,500 | £139 | 8.5 yrs | +5.9 pts · reaches C |
| Solar photovoltaic panels | — | £3,500 – £5,500 | £169 | 26.6 yrs | +7.1 pts · reaches B |
| Solar water heating(optional, beyond B) | — | £4,000 – £6,000 | £142 | 35.3 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 £307 a year — a 5.4% annual return on £5,675.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2024, states £1,562 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
Estimated today: £150,650 HPI-indexed estimate, not a valuation
Plas Islwyn: 17 sales since 1995 · £114,417 average over 10 years
Schools nearby
The DfE register covers England. Welsh schools are held in a separate Welsh Government register, which we have not ingested yet.
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 W01001519, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.
Plas Islwyn
How this home sits against its street.