| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| Cavity wall insulation | — | £500 – £1,500 | £44 | 22.8 yrs | +3.0 pts |
| Flat roof insulation | — | £850 – £1,500 | £45 | 26.3 yrs | +3.0 pts |
| Solar photovoltaic panels | — | £3,500 – £5,500 | £54 | 50+ yrs | +3.7 pts |
| Floor insulation | — | £4,000 – £6,000 | £59 | 50+ yrs | +4.0 pts · reaches C |
| Solar water heating(optional, beyond C) | — | £4,000 – £6,000 | £46 | 50+ yrs | +3.1 pts |
| Solid wall insulation(optional, beyond C) | — | £4,000 – £14,000 | £64 | 50+ yrs | +4.3 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
£1,317
per year at grade D
£1,006
per year at grade C
The full plan saves £202 a year — a 1.7% annual return on £11,675.
Restated at the fuel prices assumed in July 2026. This certificate, assessed in 2020, states £843 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
17 January 2025£335,000
29 June 2021£165,000
30 September 2010£130,000
Estimated today: £343,964 HPI-indexed estimate, not a valuation
Schools nearby
The DfE register covers England. Welsh schools are held in a separate Welsh Government register, which we have not ingested yet.