A typical household can save up to £590 a year on heating bills with free or subsidised loft insulation through the Great British Insulation Scheme (GBIS).
If your home has less than 100mm of loft insulation, you could be losing up to a quarter of your heating through the roof. The Great British Insulation Scheme (GBIS) is the primary government-funded route for free or heavily subsidised loft insulation in 2026.
The scheme operates a two-tier structure. The “broader group” targets households in Council Tax bands A–D in England and A–E in Scotland and Wales, with an Energy Performance Certificate (EPC) rating of D or below. The “low-income group” is for households receiving specific means-tested benefits. Energy Saving Trust figures show a typical semi-detached home can save around £590 annually on heating bills after insulation is installed (Energy Saving Trust, 2026).
Quick numbers, loft insulation grant values and energy savings in 2026
| Measure | Value (with source) |
|---|---|
| Typical grant value for a 3-bed semi-detached house (GBIS) | £1,500–£2,000 (full cost covered) (GOV.UK, Great British Insulation Scheme, 2026) |
| Average annual energy saving | £590 per year (Energy Saving Trust, 2026) |
| Typical cost without a grant | £500–£1,200 depending on property size and access (TrustMark, 2026) |
| Average loft area covered | 50–70 m² for a typical 3-bed semi-detached home (GOV.UK, Great British Insulation Scheme, 2026) |
| Typical installation time | 4–8 hours for a standard loft (Energy Saving Trust, 2026) |
The Great British Insulation Scheme (GBIS) is the main grant for loft insulation in 2026.
This is the direct answer to the question of which grant covers loft insulation in 2026. GBIS replaced the Energy Company Obligation (ECO4) as the primary scheme for loft insulation, though ECO4 still runs for low-income households in hard-to-treat properties.
Eligibility hinges on your property’s Energy Performance Certificate (EPC) rating and your Council Tax band (for the broader group) or receipt of qualifying benefits (for the low-income group). The grant covers the full cost of installation for eligible households. There is no upfront payment required (GOV.UK, Great British Insulation Scheme, 2026).
Eligibility for free loft insulation, Council Tax bands, EPC ratings, and benefits
The broader group includes households in Council Tax bands A–D in England and A–E in Scotland and Wales, with an EPC rating of D, E, F, or G. The low-income group requires receipt of at least one qualifying means-tested benefit. These benefits include Universal Credit, Pension Credit, Income Support, Child Tax Credit (with a gross annual income below £20,000), and Working Tax Credit (GOV.UK, Great British Insulation Scheme, 2026).
The property must have an existing loft insulation depth of less than 100mm, or be completely uninsulated, to qualify for a full top-up or new installation. If your loft already has 100mm or more, you will not qualify for a grant under GBIS (GOV.UK, Great British Insulation Scheme, 2026).
How to verify a loft insulation installer, MCS certification and TrustMark registration
All installers working under GBIS must be certified by the Microgeneration Certification Scheme (MCS) for insulation work. MCS certification ensures the installer meets technical standards for quality and safety (MCS, 2026).
Installers must also be registered with TrustMark, the government-endorsed quality scheme. TrustMark provides consumer protection, including access to dispute resolution if something goes wrong (TrustMark, 2026).
Homeowners can check the MCS Installer Database and TrustMark website to confirm a contractor’s credentials before agreeing to any work. Do not proceed with an installer who cannot provide both MCS and TrustMark certification.
The installation process, what happens from survey to completion
A certified surveyor will assess your loft space, measure current insulation depth, and check for damp or ventilation issues. If the loft has existing insulation that is less than 100mm, it may need to be removed and replaced (Energy Saving Trust, 2026).
The installer clears the loft, removes old insulation if necessary, and lays new mineral wool or sheep’s wool insulation to the required depth. The standard depth for optimal U-value is 270mm to 300mm. The installer will also fit insulation around loft hatches, pipes, and water tanks to prevent heat loss and freezing risks.
The entire installation typically takes 4–8 hours for a standard loft. After completion, the surveyor will check the work meets building regulations and provide a certificate of installation.
Loft insulation grants for non-eligible households, ECO4 alternatives and local authority schemes
Households that do not qualify for GBIS may still access loft insulation through the Energy Company Obligation (ECO4) if they are on a low income or live in a hard-to-treat property. ECO4 targets households with an EPC rating of E, F, or G and those receiving qualifying benefits (GOV.UK, ECO4, 2026).
Some local authorities in England, Scotland, and Wales offer discretionary grants for loft insulation. These are often funded through the Home Upgrade Grant (HUG) or the Social Housing Decarbonisation Fund (GOV.UK, Home Upgrade Grant, 2026).
Private homeowners who do not qualify for any grant can still apply for a 0% VAT rate on insulation materials and installation. This rate is valid until March 2027 (HMRC, VAT Notice 708/6, 2026).
The timeline, how long it takes from application to installation in 2026
From application to survey, the process typically takes 2–4 weeks. From survey to installation, the wait is usually 4–8 weeks, depending on installer availability and property access.
Ofgem data for the 2025/26 period shows the total process from application to completion averages 6–12 weeks (Ofgem, GBIS quarterly reports, 2025/26).
How to check your EPC rating and Council Tax band before applying
Comparing loft insulation grants with cavity wall and solid wall insulation grants
Frequently Asked Questions
The Great British Insulation Scheme (GBIS) is the main government grant for loft insulation in 2026. It covers full or subsidised costs for eligible households, with typical grant values of £1,500–£2,000 for a 3-bed semi-detached home according to GOV.UK.
You qualify if your home is in Council Tax bands A–D in England or A–E in Scotland and Wales, with an EPC rating of D or below. Low-income households receiving specific benefits also qualify under the scheme's low-income group.
You can save up to £590 per year on heating bills after installing loft insulation, based on Energy Saving Trust figures for a typical semi-detached home. Savings depend on your current insulation level and property size.
Yes, the Great British Insulation Scheme (GBIS) is the primary grant for loft insulation in 2026. It replaced ECO4 as the main scheme, though ECO4 still runs for low-income households in hard-to-treat properties.
Apply through an approved TrustMark installer who will assess your property and submit the grant application. You can also check eligibility on the GOV.UK Great British Insulation Scheme page.
