| Measure | Grant | Net cost | Saving / yr | Payback | Grade effect |
|---|---|---|---|---|---|
| High-retention storage heaters | — | £1,200 – £1,600 | £438 | 3.2 yrs | +12.7 pts · reaches D |
| Floor insulation | — | £800 – £1,200 | £222 | 4.5 yrs | +6.5 pts |
| Cavity wall insulation | — | £500 – £1,500 | £166 | 6.0 yrs | +4.8 pts · reaches C |
| Solar water heating(optional, beyond C) | — | £4,000 – £6,000 | £173 | 29.0 yrs | +5.0 pts |
| Solar photovoltaic panels(optional, beyond C) | — | £9,000 – £14,000 | £206 | 50+ 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 the latest available month. 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 £827 a year — a 24.3% annual return on £3,400.
Restated at the fuel prices assumed in the latest available month. This certificate, assessed in 2013, states £1,258 a year at the prices assumed then. Modelled costs, not a bill.
Sold prices
No sale recorded for this address since 1995.
Blackberry Lane: 3 sales since 1995
Schools nearby
The schools’ own performance — Progress 8 shows value added, not just raw results.
| School | Phase | Distance | Progress |
|---|---|---|---|
| Pomphlett Primary School | Primary | 0.1 mi | — |
| Morley Meadow Primary School | Primary | 0.2 mi | — |
| Oreston Community Academy | Primary | 0.6 mi | — |
| Plymstock School | Secondary | 0.4 mi | Progress 8 0.00 · average (2023/24) |
| Coombe Dean School | Secondary | 1.2 mi | Progress 8 +0.16 · average (2023/24) |
| Lipson Co-operative Academy | Secondary | 1.2 mi | Progress 8 +0.40 · 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.