Whole-House Energy Retrofit
Insulation, heat pump, underfloor heating, solar, battery, and ventilation. One company, one project plan, one point of contact. The complete fabric-first approach to slashing your energy bills by up to 80%.
The Fabric-First Approach
Most installers sell individual products. A solar company sells you solar. A plumber sells you a heat pump. Nobody looks at the whole picture. The result is oversized equipment, wasted money, and performance gaps.
Green Hat Renewables takes a different approach. With roots in construction and expertise across all five core building services, we design your retrofit as a single, coordinated project. Every element is sized and sequenced to complement the others, delivering the lowest possible energy bills with the highest possible comfort.
The Five Steps to a Zero-Carbon Home
Insulate the Envelope
Up to 70% heat loss reductionExternal wall insulation reduces heat loss by up to 70% in solid-walled homes common across East Anglia. By wrapping your home first, every subsequent system works more efficiently and can be sized smaller, saving you money.
Learn more about External Wall InsulationUpgrade the Heating
£7,500 BUS grant availableWith insulation in place, a smaller heat pump delivers the same comfort at lower running costs. The £7,500 BUS grant makes the switch affordable, and a well-insulated home means the heat pump operates at peak efficiency year-round.
Learn more about Air Source Heat PumpDistribute Efficiently
25% more efficient than radiatorsUnderfloor heating operates at 35-45 degrees C, precisely where heat pumps are most efficient. The result is even warmth throughout your home with no cold spots and no radiators taking up wall space.
Learn more about Underfloor HeatingGenerate Your Own Power
60-80% heat pump electricity offsetSolar panels offset the electricity your heat pump consumes. Paired with battery storage, you store daytime generation for evening use and earn from smart export tariffs. A 4kW system typically covers 60-80% of a heat pump's annual electricity needs.
Learn more about Solar Panels + BatteryVentilate Properly
95% heat recovery from exhaust airAn airtight, insulated home needs controlled ventilation to maintain fresh air quality. MVHR recovers up to 95% of the heat from extracted air, delivering fresh filtered air without the energy penalty of opening windows.
Learn more about MVHRIndicative Costs and Grants
Every retrofit is different. These ranges are based on a typical 3-bed detached home in East Anglia. Your free survey will provide exact figures.
| Component | Cost Range | Available Grant / Relief |
|---|---|---|
| External Wall Insulation | £5,000-£15,000 | ECO4 may cover full cost |
| Air Source Heat Pump | £10,000-£18,000 | £7,500 BUS grant |
| Underfloor Heating | £4,000-£7,000 | Included in BUS quote |
| Solar Panels (4kW) | £5,000-£8,000 | 0% VAT |
| Battery Storage (5kWh) | £2,500-£5,000 | 0% VAT |
| MVHR System | £4,000-£8,000 | Part of retrofit coord. |
| Total before grants | £30,500-£61,000 | £7,500+ in grants |
Phased Payment, Not Lump Sum
Most homeowners spread their retrofit over 6-24 months. You pay for each phase as it happens, not the full amount upfront. We also offer finance options on individual elements. Start with insulation and a heat pump (net cost from £7,500 after BUS grant), then add solar and battery when ready.
Why One Company Matters
One person coordinates every trade, every delivery, every inspection. No chasing multiple contractors.
We size your heat pump based on the insulated building, not the current one. Smaller pump, lower cost, better efficiency.
If anything goes wrong with any element of your system, you call one number. No finger-pointing between trades.
15+ years in construction means we understand building fabric. We do not just bolt renewables onto walls, we understand the walls themselves.
We apply for BUS, check ECO4 eligibility, ensure 0% VAT, and explore local authority funding. All paperwork handled.
Every phase is designed with the complete system in mind. Nothing gets ripped out or replaced when the next phase begins.
Typical Retrofit Timeline
Frequently Asked Questions
Related Guides
Learn about costs, grants, and the technology behind each element of a whole-house retrofit.
Ready to Start Saving on Energy?
Get your free, no-obligation survey and personalised quote. Our MCS-certified team is ready to help you switch to clean, affordable energy.