Home energy upgrade
Home Insulation
Loft, cavity wall, and solid wall insulation reduce heat loss — lowering energy bills, improving comfort, and in many cases fully funded via ECO4 or GBIS for eligible households.
Step by step
How Home Insulation installation works
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An energy assessor or installer surveys your property to identify which insulation measures are viable and cost-effective.
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Eligibility for ECO4 or GBIS funding is checked — qualifying households may receive works at no cost.
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Cavity wall insulation is injected via small drill holes; loft insulation is laid between and over joists — both typically in one day.
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Solid wall insulation (internal or external) is a more involved project; scaffolding may be required for external systems.
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A completion certificate is issued; an updated EPC may be recommended post-installation to reflect improved ratings.
Why it's worth it
Benefits of Home Insulation
- Directly reduces heat loss — the single most cost-effective first step for most homes
- May be fully funded for eligible households via ECO4 or the Great British Insulation Scheme
- Improves your EPC rating, which may unlock further grants (e.g. BUS for a heat pump)
- Reduces draughts and cold spots, improving comfort throughout the year
- Lower heating bills from the moment installation is complete
- Cavity wall and loft insulation are typically installed in a single day with minimal disruption
What to budget
Typical cost
Loft insulation: typically £300–£700. Cavity wall: typically £500–£1,500. Solid wall (external): typically £8,000–£22,000. Many households pay nothing via ECO4/GBIS.
Costs vary significantly depending on property size, existing systems, and installer. A surveyor's assessment will give you an accurate figure. Available grants (listed below) can substantially reduce the net cost.
Is this right for you?
Ideal for
- Homes with uninsulated or under-insulated lofts (pre-2000 properties)
- Properties with unfilled cavity walls (typically built 1920–1990)
- Households receiving means-tested benefits — likely eligible for free insulation
- Any home with an EPC rating of D–G looking to reduce bills and carbon
Financial support
Grants you may qualify for
Great British Insulation Scheme (GBIS)
Free / subsidisedFunded by energy suppliers, GBIS provides free or subsidised insulation to homes in council tax bands A–D with an EPC rating of D–G. UK-wide.
Energy Company Obligation — ECO4
Up to 100% fundedLarge energy suppliers fund free insulation and heating upgrades for low-income and vulnerable households receiving means-tested benefits. Can cover 100% of costs.
Ready to go?
Find certified home insulation installers near you
Compare MCS-certified specialists in your area, check their credentials, and book a free assessment worth £380.
