| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Flue gas heat recovery | — | £400 – £900 | £106 | 6.1 yrs | +5.0 pts |
| Party wall insulation | — | £300 – £600 | £59 | 7.6 yrs | +2.8 pts |
| High-performance doors | — | £1,500 – £500 | £87 | 11.4 yrs | +4.1 pts |
| Cavity wall insulation | — | £500 – £1,500 | £82 | 12.2 yrs | +3.9 pts |
| Room-in-roof insulation | — | £1,500 – £2,700 | £151 | 13.9 yrs | +7.1 pts · reaches E |
| Band A condensing boiler | — | £2,200 – £3,000 | £67 | 38.7 yrs | +3.2 pts |
| Floor insulation | — | £4,000 – £6,000 | £109 | 45.8 yrs | +5.2 pts |
| Solar water heating | — | £4,000 – £6,000 | £85 | 50+ yrs | +4.0 pts · reaches D |
| Solar photovoltaic panels(optional, beyond D) | — | £5,000 – £8,000 | £101 | 50+ yrs | +4.8 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 £747 a year — a 4.2% annual return on £17,800.
Energy costs as modelled on the certificate, not a bill. This fuel has too few recent certificates to restate at today's prices.
Sold prices
Estimated today: £175,181 HPI-indexed estimate, not a valuation
Penrhiw: 18 sales since 1995 · £174,875 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 W01002003, to 2026-06. An LSOA holds about 1,500 people, so this covers far more than one street.
Penrhiw
How this home sits against its street.