Professional PAS 2035 retrofit coordination and carbon advice for UK homeowners. Calculate your home’s carbon savings, check funding eligibility, and get a personalised retrofit plan.
Loft Insulation — Top-up or new insulation in the roof space to reduce heat loss through the ceiling. Typical cost £300–£800. Saves up to 530kg of CO2 per year and around 8% on energy bills.
Cavity Wall Insulation — Filling the gap between external and internal walls with insulating material. Typical cost £500–£1,500. Saves up to 680kg of CO2 per year and around 10% on energy bills.
Solid Wall Insulation — Internal or external wall insulation for solid-wall properties (pre-1920s builds). Typical cost £5,000–£15,000. Saves up to 1,900kg of CO2 per year and around 25% on energy bills.
Floor Insulation — Insulation under suspended timber floors to reduce ground heat loss. Typical cost £800–£2,500. Saves up to 320kg of CO2 per year.
Air Source Heat Pump — Replace gas or oil boilers with an efficient electric heat pump for heating and hot water. Typical cost £7,000–£13,000. Saves up to 2,200kg of CO2 per year. Eligible for the Boiler Upgrade Scheme grant of up to £7,500.
Ground Source Heat Pump — Highly efficient heating using stable ground temperatures via boreholes or trenches. Typical cost £12,000–£25,000. Saves up to 2,800kg of CO2 per year.
Smart Heating Controls — Thermostatic radiator valves, smart thermostats, and zoning for efficient heating. Typical cost £200–£800. Saves up to 220kg of CO2 per year.
Solar PV Panels — Generate renewable electricity from rooftop solar panels to power the home. Typical cost £4,000–£8,000. Saves up to 1,200kg of CO2 per year. Excess electricity can be sold back to the grid via the Smart Export Guarantee.
Solar Thermal Hot Water — Use solar energy to heat hot water, reducing reliance on gas or electric heating. Typical cost £3,000–£6,000. Saves up to 450kg of CO2 per year.
Mechanical Ventilation with Heat Recovery (MVHR) — Whole-house ventilation with heat recovery to maintain air quality without losing heat. Typical cost £4,000–£9,000. Essential when adding insulation under PAS 2035.
Draught Proofing — Seal gaps around doors, windows, and chimneys to prevent uncontrolled air leakage. Typical cost £100–£400. Saves up to 140kg of CO2 per year.
Double or Triple Glazing — Upgrade windows to reduce heat loss and improve comfort and acoustic performance. Typical cost £3,000–£10,000. Saves up to 410kg of CO2 per year.
Requires large energy suppliers to fund energy efficiency improvements for low-income and vulnerable households. Covers insulation, heating upgrades, and renewable technologies. Grants up to £25,000. Eligibility: households on means-tested benefits or low income, EPC rating E/F/G, owner-occupier or private tenant.
Helps households not on benefits but still struggling with energy costs. Focuses on single insulation measures. Grants up to £15,000. Eligibility: homes in EPC bands D-G, Council Tax bands A-D in England (A-E in Scotland and Wales).
Provides upfront grants of up to £7,500 towards the installation of air source heat pumps, ground source heat pumps, or biomass boilers. Eligibility: homeowners in England or Wales replacing fossil fuel heating systems.
Requires electricity suppliers to pay homeowners for renewable electricity they generate but do not use, exported back to the grid. An income stream for solar PV owners.
Provides funding for energy efficiency and low-carbon heating upgrades for low-income households in inefficient homes. Grants up to £10,000. Eligibility: income under £31,000, EPC rating E or below.
Our calculations are based on official UK data from Ofgem (energy price cap), Energy Saving Trust (installation costs and savings), DESNZ/BEIS (government energy consumption data), and BRE (SAP methodology for EPC calculations). Results are never influenced by commercial relationships.
PAS 2035:2021 is the UK government-recognised standard for the retrofit of dwellings, ensuring energy efficiency improvements are properly designed, specified, and installed.
Select retrofit measures to instantly see your potential annual CO2 savings, energy bill reductions, and estimated costs based on typical UK home data.
Yes — schemes like ECO4, the Great British Insulation Scheme, and the Boiler Upgrade Scheme can cover part or all of your retrofit costs. Use our free funding checker to see what you qualify for.
Book a retrofit assessment or get in touch through our contact form. We cover England, Wales, Scotland, and Northern Ireland.