Can You Get a Grant for Double Glazing UK 2026
The search for a free or subsidised double glazing grant is one of the most common energy-saving queries UK homeowners make. Rising heating costs and stricter energy performance standards mean many households are looking for financial help to upgrade their windows. However, the funding landscape is more restricted than many expect.
No, there is no standalone double glazing grant in 2026. Funding is available only through whole-house schemes like ECO4 or the Great British Insulation Scheme, which require additional measures such as insulation. Check if you qualify for a package worth up to £10,000.
- No standalone grant exists for double glazing in 2026.
- Funding is tied to ECO4 or GBIS whole-house packages only.
- Eligibility requires low income or poor EPC rating.
- Double glazing must be part of a fabric-first upgrade plan.
- Maximum funding per household reaches £10,000 under ECO4.
As of 2026, there is no standalone government grant that pays for double glazing alone; all available funding is tied to broader whole-house energy-efficiency schemes that require additional measures such as insulation or a heat pump (GOV.UK Energy Grants, 2026). Your eligibility depends entirely on your household income, your property’s Energy Performance Certificate (EPC) rating, and the condition of your existing windows.
The Single Most Important Thing to Know About Double Glazing Grants in 2026
The primary source of funding is the Great British Insulation Scheme (GBIS), which covers double glazing only when it is part of a whole-house upgrade package for low-income or fuel-poor households (GOV.UK Great British Insulation Scheme, 2026). Separately, the Energy Company Obligation (ECO4) may fund double glazing for eligible households, but only if the property has no existing double glazing and the windows are part of a fabric-first approach that prioritises insulation and draught-proofing before glazing (Ofgem ECO4 Guidance, 2026). No universal grant exists for double glazing for all homeowners. Eligibility is means-tested or property-specific, and you cannot simply apply for windows alone; they must be part of a larger energy-efficiency package.
How Much Funding Is Available for Double Glazing Under ECO4 and the Great British Insulation Scheme in 2026
Under ECO4, the total funding per household can reach up to £10,000 for a package of measures, but double glazing typically accounts for between £2,000 and £5,000 of that total, depending on property size, number of windows, and frame material (Ofgem ECO4 Scheme Details, 2026). The Great British Insulation Scheme covers 100% of the cost of eligible measures for qualifying households, but double glazing is only funded if the property currently has single glazing and the windows are part of a wider insulation package (GOV.UK Great British Insulation Scheme, 2026). The actual amount you receive depends on the number of windows, the frame material (uPVC, timber, or aluminium), and whether the property is in a hard-to-treat area. There is no fixed per-window grant; the funding is calculated on a case-by-case basis by the installer and scheme administrator.
Who Qualifies for a Double Glazing Grant in 2026 (Eligibility Rules)
You must be a homeowner or a private tenant with landlord permission in England, Scotland, or Wales. Northern Ireland has separate schemes under the Northern Ireland Energy Strategy (GOV.UK Energy Grants, 2026). Your household income must be below £31,000 per year under ECO4, or you must receive certain means-tested benefits such as Universal Credit, Pension Credit, Child Tax Credit, or Income Support (GOV.UK ECO4 Eligibility, 2026). The property must have an EPC rating of D, E, F, or G; properties rated A to C are not eligible for grant-funded double glazing. The windows must be single-glazed or have failed double glazing (e.g., blown seals or condensation between panes). New double glazing replacing existing functional double glazing is not funded under any scheme.
How to Apply for a Double Glazing Grant Step by Step
Step 1: Check your EPC rating and income eligibility using the online tool on the GOV.UK Energy Grants page (GOV.UK, 2026). Step 2: Contact your energy supplier (the one you pay your bills to) and ask if they are running an ECO4 or Great British Insulation Scheme programme that covers windows. Step 3: If your supplier does not offer the scheme, search for a local authorised installer on the TrustMark or MCS websites who can assess your property and apply on your behalf (TrustMark, 2026). Step 4: The installer will conduct a home survey, submit a funding application to Ofgem or the scheme administrator, and arrange installation if approved. Step 5: Installation is typically completed within 4 to 8 weeks of approval. You do not pay upfront; the installer claims the grant from the energy company.
Quick Numbers Double Glazing Grant UK 2026
| Scheme name | Funding amount | Household cost | Income cap | EPC minimum |
|---|---|---|---|---|
| ECO4 | £2,000–£5,000 (part of up to £10,000 package) | £0 for eligible households | Below £31,000/year or on benefits | D, E, F, or G |
| Great British Insulation Scheme | 100% of eligible window cost (package only) | £0 for qualifying households | Below £31,000/year or on benefits | D, E, F, or G |
| No grant (self-funded) | £0 | Full cost (typically £3,000–£7,000 for an average home) | No cap | None |
Can You Get a Grant for Double Glazing If You Have a Heat Pump Installed?
Yes, but only if the double glazing is part of a whole-house upgrade funded by ECO4 or a rare top-up arrangement with the Boiler Upgrade Scheme (BUS). The BUS itself provides £7,500 toward a heat pump installation in 2026, but it does not cover windows (GOV.UK Boiler Upgrade Scheme, 2026). If you receive a heat pump grant through ECO4, double glazing may be included as a complementary measure to improve the property’s thermal efficiency and reduce heat loss. Installing double glazing alongside a heat pump is not mandatory for the heat pump grant, but it is strongly recommended to maximise efficiency and reduce running costs. heat pump grants and eligibility in 2026
How to Verify an Installer and Ensure Your Grant Application Is Legitimate
All installers claiming grant funding must be registered with MCS (Microgeneration Certification Scheme) for heat pumps or TrustMark for general energy-efficiency measures, including windows (MCS Certified, 2026). For double glazing specifically, check that the installer is FENSA or CERTASS registered, as these bodies certify compliance with Building Regulations Part L (conservation of fuel and power) (FENSA, 2026). Always confirm that the installer is on the Ofgem-approved list for ECO4 or the Great British Insulation Scheme; you can search the Ofgem public register online (Ofgem ECO Register, 2026). Never pay an upfront fee for a grant application. Legitimate schemes are fully funded by energy suppliers, and installers should not ask for money before work begins. If an installer claims to offer a “free double glazing grant” without checking your income or EPC rating, it is likely a scam. Report suspicious offers to Citizens Advice or Action Fraud. how to spot energy grant scams
Frequently Asked Questions
No, there is no standalone free grant for double glazing in 2026. Funding is only available through schemes like ECO4 or the Great British Insulation Scheme, which require a whole-house energy efficiency package (Ofgem ECO4 Guidance, 2026).
You qualify if you are on a low income or receive means-tested benefits, and your property has an EPC rating of D or below. Eligibility also depends on your existing windows being single glazed or in poor condition (GOV.UK Energy Grants, 2026).
Under ECO4, double glazing typically accounts for £2,000 to £5,000 of the total package, which can reach up to £10,000 per household. The exact amount depends on property size and number of windows (Ofgem ECO4 Guidance, 2026).
No, all schemes require a fabric-first approach, meaning insulation and draught-proofing must be installed before or alongside double glazing. You cannot apply for windows alone (GOV.UK Great British Insulation Scheme, 2026).
The Great British Insulation Scheme covers double glazing only as part of a whole-house upgrade for low-income households. It prioritises insulation and draught-proofing before glazing (GOV.UK Great British Insulation Scheme, 2026).
