| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| High-retention storage heaters | — | £1,200 – £1,800 | £388 | 3.9 yrs | +11.4 pts · reaches C |
| Cavity wall insulation | — | £500 – £1,500 | £147 | 6.8 yrs | +4.3 pts |
| Shower heat recovery | — | £585 – £725 | £32 | 20.2 yrs | +1.0 pts |
| Solid wall insulation | — | £4,000 – £14,000 | £213 | 42.3 yrs | +6.3 pts · reaches B |
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 £780 a year — a 6.4% annual return on £12,155.
Energy costs as modelled on the certificate, not a bill.
Sold prices
Estimated today: £337,588 HPI-indexed estimate, not a valuation
South Parade: 869 sales since 1995 · £299,155 average over 10 years
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| St Swithun's Catholic Primary School | Primary | 0.3 mi | — |
| Craneswater Junior School | Primary | 0.5 mi | — |
| Southsea Infant School | Primary | 0.5 mi | — |
| Priory School | Secondary | 1.1 mi | Progress 8 -0.55 · well below average (2023/24) |
| Ark Charter Academy | Secondary | 1.2 mi | Progress 8 -0.32 · below average (2023/24) |
| St Edmund's Catholic School | Secondary | 1.4 mi | Progress 8 +0.66 · 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.
South Parade
How this home sits against its street.