Free Insulation & Energy Grants in London
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London is home to 3.6 million properties across 33 boroughs. According to EPC Register data, around 26% of recently assessed London homes are rated Band D or below — meaning over 900,000 properties could benefit from energy efficiency improvements. Three major government grant schemes are currently open to London residents, with ECO4 closing December 2026.
London has some of the highest fuel poverty rates in England, with around 12% of households estimated to be fuel-poor. The combination of high energy costs and older, poorly insulated housing stock — particularly Victorian and Edwardian terraces — means many London residents spend a disproportionate share of income on heating.
London's housing is dominated by Victorian and Edwardian terraces, post-war council estates, and purpose-built flats. Many properties have solid walls that are expensive to insulate without grant funding. Converted flats in older buildings often have poor energy ratings due to single glazing and limited insulation.
Similar government-funded energy grants are available in nearby areas including Southampton, Coventry and Leicester. Each council sets its own eligibility criteria, so it's worth checking the specific rules for your area.
Available grants in London
Warm Homes Local Grant
Up to £30,000Council-administered grant providing up to £15,000 for insulation and £15,000 for heating upgrades. Availability depends on your local council.
Boiler Upgrade Scheme
Up to £7,500Get up to £7,500 towards an air source or ground source heat pump, £2,500 for an air-to-air heat pump, or £5,000 for a biomass boiler. Available to homeowners replacing fossil fuel or electric heating.
ECO4 Insulation Grants
Varies by propertyFree cavity wall, loft, and solid wall insulation for qualifying households. Available if you receive benefits or have a low income.
Compare all UK energy grants side by side on our grant comparison page.
Could you get these grants in London?
Free 2-minute eligibility check — no obligation, no personal details needed
Check Your EligibilityLondon's 33 boroughs each publish their own ECO4 LA Flex Statement of Intent, setting local eligibility criteria. The Mayor of London's Warmer Homes programme has funded insulation and heating improvements for eligible households. Contact your borough council's housing or energy team for borough-specific grants and referrals.
Who qualifies in London?
You may qualify for free energy efficiency improvements if you:
- Receive benefits such as Universal Credit, Pension Credit, or Income Support
- Have a household income of £36,000 or less (Warm Homes Local Grant) or £31,000 (ECO4 LA Flex — varies by council)
- Live in a property with a poor EPC rating (D, E, F, or G)
- Are a homeowner, private tenant, or social housing tenant (tenants need landlord/housing provider consent)
Greater London Authority — ECO4 LA Flex Eligibility
Under ECO4 Local Authority Flexibility, Greater London Authority can refer households that don't receive qualifying benefits but meet local criteria:
- Live in a fuel-poor area (as identified by sub-regional fuel poverty data)
- Have a health condition made worse by cold housing (respiratory, cardiovascular, limited mobility)
- Have been referred by a GP, social worker, or health professional
- Receive Council Tax Reduction or Council Tax Support
- Have children under 5 or are pregnant
Source: Greater London Authority ECO4 Statement of Intent · Last checked 2026-02-15
EPC Ratings in London
Based on 35,000 energy performance certificates
Source: EPC Register (opendatacommunities.org) · Data as of 2026-02-14
Areas we cover in London
Free insulation and energy grants are available to eligible residents across London, including:
Hackney
Tower Hamlets
Lewisham
Newham
Haringey
Lambeth
Southwark
Islington
Camden
Brent
Ealing
Greenwich
Grants for tenants in London
London tenants can access free energy grants. Private renters may qualify for ECO4 insulation grants or the Warm Homes Local Grant — your landlord will need to agree to the installation. Social housing tenants should contact their housing association or local council about energy improvements. Many London boroughs also run their own tenant-specific energy advice services.
What happens after you're approved in London?
A qualified assessor visits your home (1–2 hours) to check your walls, loft, windows, and heating system.
Within 1–2 weeks, you receive a report detailing which improvements qualify for funding and your estimated energy savings.
Approved installers carry out the work free of charge. Cavity wall insulation typically takes 2–4 hours, loft insulation is usually done within a day, external wall insulation takes 1–2 weeks for a semi-detached house, and internal wall insulation takes 3–5 working days.
After installation, your property gets a new EPC certificate showing the improved energy rating.
Frequently asked questions — London
What energy grants are available in London?
London residents can access the Warm Homes Local Grant (up to £30,000), Boiler Upgrade Scheme (£7,500 for heat pumps), and ECO4 insulation grants. Several London boroughs also run their own additional programmes.
Can London renters get free insulation?
Yes, private and social housing tenants in London may qualify for free insulation through ECO4 or the Warm Homes Local Grant, provided they meet the income or benefits criteria. Your landlord will need to agree to the installation.
What is the ECO4 LA Flex income threshold in London?
ECO4 LA Flex thresholds in London vary by borough, as each borough council publishes its own Statement of Intent. Most boroughs set the household income threshold at £31,000 or below. Check with your local borough council for their specific criteria.
Is the ECO4 scheme available in London?
Yes, ECO4 is available across all London boroughs. The scheme funds free cavity wall, loft, and solid wall insulation for eligible households. ECO4 has been extended to 31 December 2026, but no successor scheme has been announced — apply while funding is available.
Can London council flat tenants get free insulation?
Yes, social housing tenants in London council flats can benefit from energy efficiency improvements. Your local council or housing association typically arranges ECO4-funded work for entire blocks. Private tenants in converted Victorian flats can also apply individually with landlord consent.
Can I get grants for a converted Victorian flat in London?
Yes, converted Victorian and Edwardian flats are common across London and are often strong candidates for grants. These properties typically have solid walls, single glazing, and poor insulation — resulting in low EPC ratings. ECO4 and the Warm Homes Local Grant can fund internal wall insulation, draught-proofing, and heating upgrades. Your landlord must consent if you are a tenant.
Do conservation area restrictions affect energy grants in London?
Conservation areas may restrict external wall insulation or window replacements that alter the building's appearance. However, internal wall insulation, loft insulation, and heating upgrades are generally unaffected. Many London conservation area properties can still benefit from ECO4 and Warm Homes Local Grant funding for internal improvements.
Which London boroughs have the highest fuel poverty?
Inner London boroughs including Hackney, Tower Hamlets, Newham, Haringey, and Lambeth consistently have higher fuel poverty rates due to older housing stock and lower household incomes. However, grants are available across all 33 boroughs — eligibility depends on your personal circumstances and property, not just your location.
Further reading
Energy grants in nearby areas
Check what grants are available in other locations near London.
Check your eligibility in London
Find out in 2 minutes which grants you qualify for — completely free, no obligation.
Check Your EligibilityFor official council information, visit Greater London Authority .
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