Whole-house retrofit, Gosport: EPC E to A
This house cost too much to heat and scored an E on its Energy Performance Certificate. The existing cavity wall insulation had to come out before anything else made sense — there is no point putting a heat pump into a house that loses heat through its walls.
- EPC E to high A
- Cavity wall extraction and ThermaBead refill
- Solar PV and battery storage
- Heat pump installation
- Whole-system approach
Fabric first, then the technology
We tackled the house in the right order. Walls first: we extracted the old cavity wall insulation with our own Extract Vac system, cleared the cavity, and refilled it with ThermaBead bonded bead insulation. Solar panels went on the roof to generate the home's own electricity. A battery stores daytime solar power for the evening and can charge on cheaper overnight rates. A heat pump replaced the old heating system, running on electricity the house increasingly makes itself.
The result
The EPC rating went from E to a high A. That is one of the biggest jumps a home can make. It is the kind of result that only comes from treating the house as a whole system rather than adding one product at a time.
Why it matters
It is the same approach the government's Warm Homes Plan is built around: insulate first, then add solar, a battery and low-carbon heating. Homeowners can now fund the solar and battery parts through the Warm Homes Loan Scheme.
Thinking about a whole-house upgrade?
We survey the whole house and tell you what order to do things in. Insulation first, then solar and storage.