Solid wall insulation grants 2026
If your home has solid walls, you may be eligible for a government grant to cover the cost of insulation. Solid wall insulation can reduce heat loss significantly, but the upfront cost is often high.
The maximum solid wall insulation grant in 2026 is £7,500 under ECO4, but most households will not receive this full amount. Eligibility depends on income, property type, and energy performance, with grants paid directly to installers.
- Maximum ECO4 grant for solid wall insulation is £7,500 in 2026.
- Grant is paid to the installer, not as cash to you.
- Eligibility requires household income below £31,000 or certain benefits.
- Great British Insulation Scheme offers up to £1,500 for lower-income homes.
- Local authority schemes may provide £2,000–£10,000, varying by council.
The maximum grant you can get for solid wall insulation in 2026 is £7,500 under the ECO4 scheme, but most households will not receive this full amount. Eligibility depends on your income, property type, and current energy performance.
The maximum grant you can get for solid wall insulation in 2026 is £7,500 – but it is not available to everyone
The £7,500 figure is the maximum grant available under the ECO4 scheme for solid wall insulation, as stated in the DESNZ “Energy Company Obligation ECO4: Final Stage Impact Assessment” (2022), which sets the cap per household (DESNZ, 2022). This amount covers the full cost of internal or external solid wall insulation only if you meet all eligibility criteria. Partial grants are also possible if the work costs less than the cap.
The grant is not a cash payment. It is paid directly to the installer by your energy supplier, and you cannot receive the money yourself. Eligibility depends on your household income, property type, and current energy performance, so most homeowners will not qualify for the full amount. The scheme is designed for lower-income households and those in the least energy-efficient homes (GOV.UK, 2026).
Quick numbers what you need to know about solid wall insulation grants in 2026
| Grant type | Maximum grant amount | Who funds it | Typical eligibility requirement |
|---|---|---|---|
| ECO4 (energy supplier obligation) | Up to £7,500 | Energy suppliers (e.g., British Gas, E.ON, Octopus) | Household income below £31,000 or receiving certain benefits |
| Great British Insulation Scheme (GBIS) | Up to £1,500 | Energy suppliers | Lower-income households in lower council tax bands (England, Scotland, Wales) |
| Local authority schemes (e.g., LAD, HUG) | Varies by council (typically £2,000–£10,000) | Local councils with central government funding | Depends on local criteria (often income or property EPC rating) |
Source: Ofgem ECO4 Guidance, 2023, DESNZ Great British Insulation Scheme, 2023, GOV.UK Local Authority Delivery Scheme, 2022.
Who qualifies for solid wall insulation grants in 2026 – the exact eligibility rules
For ECO4, you must either be receiving a qualifying benefit (e.g., Pension Credit, Universal Credit, Income Support) or have a household income below £31,000 per year (before tax), as per the DESNZ eligibility criteria (Ofgem ECO4 Eligibility, 2023). Your property must have an Energy Performance Certificate (EPC) rating of D, E, F, or G. Homes rated A, B, or C are not eligible for ECO4 solid wall insulation.
The property must have solid walls, not cavity walls. This is confirmed by a surveyor during the application process. Local authority schemes often have different income thresholds, for example £30,000 to £40,000, and may prioritise homes in fuel poverty or with low EPC ratings (GOV.UK, 2026).
What is a solid wall insulation grant and how does it work?
A solid wall insulation grant is government-funded money that pays for external or internal wall insulation on homes with solid walls. These homes were usually built before 1920 in the UK. The work is installed by an accredited company.
You do not receive cash. The grant covers the installation cost directly, and you may pay nothing or a reduced amount depending on your circumstances. The grant is delivered through energy suppliers under ECO4 or GBIS, or through local councils, not directly from the government. To get the grant, you must apply through a participating installer or your energy supplier, who checks your eligibility and arranges the work (Energy Saving Trust, 2023).
How to verify your installer is accredited for solid wall insulation grants – MCS, TrustMark, and Gas Safe
Solid wall insulation installers under ECO4 must be certified by the Microgeneration Certification Scheme (MCS) or equivalent, and registered with TrustMark. This is a legal requirement for grant-funded work (Ofgem ECO4 Guidance, 2023).
Check the MCS Installer Database at mcscertified.com to confirm your installer is listed for “Solid Wall Insulation” (MCS, 2026). This ensures they meet technical standards. TrustMark registration at trustmark.org.uk is also mandatory for ECO4 and GBIS. It guarantees the installer follows consumer protection and quality standards (TrustMark, 2026). Gas Safe Register is not relevant for solid wall insulation unless the installer also works on gas heating systems.
What happens if you do not qualify for ECO4 – alternative grants and schemes for solid wall insulation
The Great British Insulation Scheme (GBIS) offers up to £1,500 for solid wall insulation, but only if your home is in council tax bands A to D in England or A to E in Scotland and Wales, and you have a low income (DESNZ, 2023). Local authority schemes, such as the Home Upgrade Grant (HUG) or Local Authority Delivery (LAD), can provide up to £10,000 for solid wall insulation, but funding is limited and depends on your council’s budget (GOV.UK, 2022).
Some energy suppliers offer “flexible eligibility” under ECO4. This means they may fund insulation for households just above the income threshold if referred by the local council. Check with your supplier (Ofgem, 2023). If you own a listed building or a property in a conservation area, you may need special permission for external insulation, but grants still apply. Check with your council first.
Compare solid wall insulation costs without grants
How to apply for a solid wall insulation grant in 2026 – the step-by-step process
First, check your eligibility online using a free tool on the GOV.UK website or the Energy Saving Trust’s “Grant Finder”. This will tell you which schemes you qualify for (GOV.UK, 2026). Contact your energy supplier or a local installer listed on the MCS database to start the application. They will handle the eligibility checks.
The installer will arrange a home survey to confirm your walls are solid and assess the property for insulation suitability. If approved, the installer will complete the work, and the grant is paid directly to them. You pay any remaining cost after the grant is applied (Energy Saving Trust, 2023).
Understanding EPC ratings and insulation grants
Frequently Asked Questions
The maximum grant under ECO4 is £7,500, as set by the DESNZ impact assessment (2022). Most households will not receive the full amount, as eligibility depends on income and property energy performance.
You typically qualify if your household income is below £31,000 or you receive certain benefits, per GOV.UK (2026). Property must have solid walls and poor energy efficiency.
Yes, the ECO4 scheme covers both internal and external solid wall insulation up to £7,500. The grant is paid directly to the installer by your energy supplier.
You apply through your energy supplier or a certified installer. They check your eligibility under ECO4 or the Great British Insulation Scheme, as outlined by Ofgem.
Yes, the Great British Insulation Scheme offers up to £1,500 for lower-income households in lower council tax bands, even if you do not receive benefits.
ECO4 provides up to £7,500 for low-income households, while GBIS offers up to £1,500 for a broader group. Both are funded by energy suppliers, per GOV.UK (2026).
You may get it fully covered if you meet ECO4 criteria and the work costs £7,500 or less. Otherwise, partial grants are available, but you cannot receive cash.
