greenhomesums
EPC B → A upgrade for EPC B → A
EPC A is rare in the UK — fewer than 1% of homes. Reaching it usually means a near-complete home-energy overhaul: heat pump, solar, battery, and top-tier insulation.
Upgrade measure stack
Cheapest-first ordering — calculator stops adding measures once the gap to A closes.
| Measure | Cost | SAP uplift |
|---|---|---|
| Full LED lighting retrofit | £250 | +1.0 |
| Thermostatic radiator valves + controls | £400 | +1.0 |
| Air-source heat pump (BUS-eligible) | £11000 | +10.0 |
| Total | £11650 | to band A |
What's specific about this archetype
The A-band threshold is a SAP of 92. At that level, the calculation effectively requires renewable on-site generation on top of zero-fossil heating. It's achievable on modern detached homes but rarely makes economic sense on running-cost alone — the buyers are climate-motivated, keen-resale-uplift, or buying a green mortgage product that pays for itself through the rate discount.
Model your exact property
The figures above use a reference archetype. Your real floor area, mortgage balance, current energy bill and exact current band will shift the numbers. Use the full EPC upgrade calculator for a customised version, the insulation savings calculator to choose between competing fabric measures, and BUS grant eligibility if a heat pump is on the shortlist.
Other premium upgrades
| Archetype | Start → Target | Net cost | Annual saving |
|---|---|---|---|
| EPC C → B (semi) | EPC C → B | £4150 | £90/yr |
| EPC B → A (this page) | EPC B → A | £4150 | £96/yr |