Free Insulation & Energy Grants in Cardiff
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Cardiff residents can access free home energy upgrades through the Welsh Government's Nest scheme, ECO4, and the Boiler Upgrade Scheme. With approximately 155,000 homes across the capital (ONS 2021) and significant areas of Victorian and Edwardian housing in inner-city wards, Cardiff has some of the highest concentrations of fuel poverty in urban Wales. The Nest scheme — Wales's equivalent of England's Warm Homes Local Grant — provides free insulation, heat pumps, solar panels, and boiler replacements for eligible households. ECO4 has been extended to 31 December 2026, meaning Cardiff residents should check eligibility while funding is still available.
The Warm Homes Local Grant is not available in Wales. Instead, Wales offers the Nest Warm Homes Programme for eligible households. The Boiler Upgrade Scheme and ECO4 are available in Wales.
Cardiff has some of the highest fuel poverty levels in urban Wales, with one in four Welsh households unable to heat their homes adequately (Welsh Government, 2024) (Welsh Government fuel poverty modelled estimates, Oct 2024 data, published Aug 2025). However, fuel poverty is concentrated in inner-city wards including Splott, Adamsdown, Ely, Caerau, and Grangetown, where older housing stock, lower household incomes, and poor thermal efficiency combine to create acute energy hardship. The Welsh Government's Nest scheme is the primary route for Cardiff households to access free energy efficiency improvements.
Cardiff's housing stock ranges from Victorian and Edwardian bay-fronted terraces in Splott, Canton, Grangetown, and Roath, to large post-war council estates in Ely, Caerau, Llanrumney, and St Mellons. The inner-city terraces typically have solid brick or stone walls with minimal insulation, single-glazed bay windows, and draughty suspended timber floors — making them strong candidates for cavity wall insulation, loft insulation, and solid wall insulation through Nest or ECO4. Newer suburbs like Pontprennau and parts of Llanishen tend to have better thermal performance, but 1960s–1980s homes with unfilled cavity walls are still common and can benefit from free cavity wall insulation.
Similar government-funded energy grants are available in nearby areas including Swansea, Bristol and Southampton. Each council sets its own eligibility criteria, so it's worth checking the specific rules for your area.
Available grants in Cardiff
Nest Warm Homes Programme
Free improvementsWales's energy efficiency scheme providing free home improvements including insulation and heating for eligible households with an EPC rating of E or below.
Boiler Upgrade Scheme
Up to £7,500Get up to £7,500 towards an air source or ground source heat pump, or £2,500 for an air-to-air heat pump. Available to homeowners in England and Wales.
ECO4 Insulation Grants
Varies by propertyFree cavity wall, loft, and solid wall insulation for qualifying households across Great Britain.
Heating upgrades available in Cardiff
Cardiff residents may qualify for free heating system upgrades through Nest or ECO4. The Nest scheme can provide heat pumps, boiler repair or replacement (if your home is without heating or hot water), and solar panels. The Boiler Upgrade Scheme offers up to £7,500 towards an air source heat pump for homeowners replacing fossil fuel heating — this is available across Wales. ECO4 can fund boiler replacements and heating system upgrades for households on qualifying benefits. Cardiff homes with old gas boilers, electric storage heaters, or no central heating should check eligibility for these programmes.
Compare all UK energy grants side by side on our grant comparison page.
Could you get these grants in Cardiff?
Free 2-minute eligibility check — no obligation, no personal details needed
Check Your EligibilityCardiff residents can access the Welsh Government's Nest scheme for free home energy efficiency improvements — including insulation, heat pumps, solar panels, and boiler repair or replacement. Call Nest free on 0808 808 2244 (Mon–Fri 9am–6pm) or request a callback at gethomeenergyadvice.service.gov.wales. Cardiff Council also provides energy advice through its housing team and signposts residents to Nest and ECO4. The Cardiff Capital Region City Deal includes commitments to energy efficiency and decarbonisation across South East Wales. ECO4 (a GB-wide scheme) is also available and has been extended to 31 December 2026.
Who qualifies in Cardiff?
You may qualify for free energy efficiency improvements if you:
- Nest scheme: receive means-tested benefits OR live in a home with EPC rating E, F, or G
- Boiler Upgrade Scheme: any homeowner replacing fossil fuel or electric heating (no income test)
- ECO4: receive qualifying benefits (Universal Credit, Pension Credit, etc.)
- Are a homeowner or private tenant (with landlord consent). Social housing is not eligible for Nest.
Areas we cover in Cardiff
Free insulation and energy grants are available to eligible residents across Cardiff, including:
Canton
Splott
Ely
Caerau
Grangetown
Butetown
Adamsdown
Cathays
Roath
Riverside
Llanrumney
Rumney
St Mellons
Llanishen
Whitchurch
Pontprennau
Fairwater
Pentwyn
Trowbridge
Heath
Grants for tenants in Cardiff
Private tenants in Cardiff can access free energy improvements through the Nest scheme, provided their landlord gives written consent. Nest is available to homeowners and private tenants — you do not need to be on benefits if your home has an EPC rating of E, F, or G. Social housing tenants are NOT eligible for Nest (housing associations manage improvements for their own stock), but may benefit from ECO4 — contact your housing association directly. Private tenants can also access ECO4 grants with landlord consent. Cardiff has a significant private rented sector, particularly in Cathays, Roath, and Adamsdown, and many of these properties have poor EPC ratings that make them eligible for free upgrades.
How to apply for free home energy upgrades in Cardiff
There are several ways to apply for free home energy upgrades in Cardiff.
Check your eligibility in 2 minutes. We'll show you which grants you may qualify for based on your postcode, property type, and circumstances.
Start now →Nest is the primary route for free energy improvements in Wales. Call free on 0808 808 2244 (Mon–Fri, 9am–6pm) for a free assessment, or request a callback online. Nest can arrange insulation, heat pumps, solar panels, and boiler repair at no cost to eligible households.
Visit website →ECO4 is a separate GB-wide scheme available in Wales. If you receive qualifying benefits, your energy supplier may refer you directly for ECO4-funded insulation or heating measures. Contact their customer service team and ask about ECO4.
Homeowners in Cardiff can get up to £7,500 towards an air source heat pump through the Boiler Upgrade Scheme. This is available regardless of income — you just need to be replacing a fossil fuel heating system. Your installer applies on your behalf.
Visit website →Once you contact Nest, a qualified assessor will visit your home to determine which improvements are suitable. If eligible, Nest arranges everything — from surveying to installation — at no cost. For ECO4, an approved installer handles the application and installation process.
If you don't qualify for grants
If you're not eligible for Nest or ECO4, you can still get free energy advice from Nest by calling 0808 808 2244 — they can help you find the best energy tariff, check benefit entitlements, and advise on low-cost energy saving measures. The Boiler Upgrade Scheme (£7,500 for heat pumps) is available to all homeowners regardless of income. You can also contact Cardiff Council's housing team for signposting to other local support.
What happens after you're approved in Cardiff?
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 — Cardiff
How do I get free insulation in Cardiff?
Free insulation in Cardiff is available through two main schemes: the Welsh Government's Nest scheme and ECO4. Nest provides free insulation (loft, cavity wall, solid wall) for homeowners and private tenants who receive means-tested benefits or live in a home with an EPC rating of E, F, or G. ECO4 is a separate GB-wide scheme for households on qualifying benefits. Use our eligibility checker or call Nest free on 0808 808 2244.
What is the Nest scheme and can I get it in Cardiff?
Nest is the Welsh Government's energy efficiency scheme providing free home improvements including insulation, heat pumps, solar panels, and boiler repair or replacement. Yes, Cardiff residents are fully eligible. To qualify, you typically need to receive means-tested benefits (Universal Credit, Pension Credit, etc.) or live in a home with an EPC rating of E, F, or G. Nest is for homeowners and private tenants — social housing is not eligible. Call 0808 808 2244 for a free assessment.
What ECO4 grants are available in Cardiff?
ECO4 is available across Cardiff and all of Wales. It provides free cavity wall insulation, loft insulation, solid wall insulation, underfloor insulation, and heating upgrades for eligible households. You may qualify if you receive benefits such as Universal Credit, Pension Credit, Child Tax Credit, Income Support, JSA, or ESA. ECO4 has been extended to 31 December 2026 — check your eligibility while funding is still available.
Can I get a free boiler in Cardiff?
Free boiler repair or replacement in Cardiff is available through the Nest scheme if your home is without heating or hot water. Nest can also install heat pumps as an alternative to gas boilers. ECO4 may fund boiler replacements for households on qualifying benefits. The Boiler Upgrade Scheme provides £7,500 towards an air source heat pump for any homeowner replacing fossil fuel heating. Call Nest on 0808 808 2244 to check your eligibility.
What energy grants are available in Wales?
Wales has three main energy grant schemes: (1) Nest — the Welsh Government scheme providing free insulation, heat pumps, solar panels, and boiler repair for eligible households; (2) ECO4 — a GB-wide scheme providing free insulation and heating upgrades for households on qualifying benefits, extended to December 2026; (3) Boiler Upgrade Scheme — £7,500 towards heat pumps for homeowners. Note: The Warm Homes Local Grant is England-only and does NOT apply in Wales.
Can tenants get free insulation in Cardiff?
Yes, private tenants in Cardiff can access free insulation through Nest or ECO4, provided their landlord gives written consent. The installation is free for both tenant and landlord, and it improves the property's EPC rating. Social housing tenants should contact their housing association directly, as Nest does not cover social housing — housing associations arrange improvements for their own stock.
What home improvements can Nest provide in Cardiff?
Nest can provide a range of free home energy improvements for eligible Cardiff households, including: air source heat pumps, loft insulation, cavity wall insulation, solid wall insulation, solar panels, and boiler repair or replacement (if your home is without heating or hot water). A qualified assessor visits your home to determine which measures are most suitable.
How do I apply for Nest in Cardiff?
To apply for Nest in Cardiff, call free on 0808 808 2244 (Monday to Friday, 9am to 6pm) or request a callback at gethomeenergyadvice.service.gov.wales. You can also use our eligibility checker to see which schemes you qualify for. Nest will arrange a free home assessment and, if eligible, coordinate the installation of energy efficiency improvements at no cost to you.
Further reading
Energy grants in nearby areas
Check what grants are available in other locations near Cardiff.
Check your eligibility in Cardiff
Find out in 2 minutes which grants you qualify for — completely free, no obligation.
Check Your EligibilityFor official council information, visit Cardiff Council .
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