Government Grants for Windows & Doors in 2026: What's Available?

Replacing old windows and doors is one of the most effective ways to improve your home's energy efficiency, but the cost can be significant. The good news is that several government-backed schemes are available in 2026 to help UK homeowners reduce the financial burden. This guide explains every current grant, who qualifies, and how to access them.

Why the Government Funds Window Replacements

The UK government has committed to reaching net zero carbon emissions by 2050. Residential properties account for approximately 14% of the UK's total carbon output, and a significant proportion of that comes from heat loss through inefficient windows and doors. Single-glazed windows lose up to three times more heat than modern double glazing, while old uPVC units from the 1990s often have failed seals and U-values above 2.8 W/m2K.

By funding window and door replacements, the government reduces national energy consumption while lowering household bills. The average UK home can save between £100 and £235 per year on energy bills simply by upgrading from single glazing to A-rated double-glazed windows.

ECO4: The Energy Company Obligation Scheme

ECO4 is the largest and most widely available grant scheme for window and door replacements in 2026. It requires energy suppliers with over 150,000 customers to fund energy efficiency improvements in qualifying homes.

Who Qualifies for ECO4?

Eligibility is primarily based on household income and the property's current energy performance. You may qualify if:

• You receive means-tested benefits such as Universal Credit, Pension Credit, Child Tax Credit or Income Support
• Your property has an EPC rating of D, E, F or G
• You are referred through the ECO Flex route by your local authority, which allows councils to set their own eligibility criteria for fuel-poor households

What Does ECO4 Cover?

ECO4 can cover the full cost of replacement windows and doors, including installation. The scheme prioritises properties with the worst energy performance — those rated E, F or G typically receive the most comprehensive funding. The aim is to bring every qualifying property up to at least an EPC band D.

How to Apply

Contact your energy supplier directly or search the Simple Energy Advice website for approved installers in your area. Your local council's housing or energy team can also advise on ECO Flex eligibility. At Vitrum Solutions, we work with ECO-approved partners and can guide you through the process.

Boiler Upgrade Scheme (BUS) — Indirect Window Benefits

The Boiler Upgrade Scheme provides grants of up to £7,500 towards heat pump installations. While it does not directly fund windows, many homeowners combine a heat pump installation with window upgrades to maximise efficiency. A heat pump works best in a well-insulated home, and installers often recommend replacing old windows before or alongside the heating upgrade.

If you are planning a heat pump installation, upgrading to triple-glazed aluminium windows at the same time ensures the system operates at peak efficiency and reduces your payback period.

Warm Home Discount Scheme

The Warm Home Discount provides a one-off £150 rebate on electricity bills for eligible low-income households. While this is a bill discount rather than a window grant, it can help offset the ongoing costs associated with poor insulation. Eligibility is automatic for most Pension Credit recipients, and broader eligibility groups are determined by individual energy suppliers.

Local Authority Grants and Schemes

Many local councils operate their own energy efficiency programmes in addition to national schemes. These vary significantly by region:

• Greater London Authority: The Warmer Homes programme provides grants of up to £10,000 for insulation and glazing improvements in qualifying London homes
• Welsh Government: The Warm Homes Nest scheme covers window and door replacements for eligible households across Wales
• Scottish Government: Warmer Homes Scotland provides grants up to £7,500 for energy efficiency measures including window replacements
• Local discretionary funds: Many councils in the South East, including Buckinghamshire and Hillingdon, operate hardship funds that can contribute towards glazing improvements

Contact your local council's housing department to ask about available schemes. Eligibility criteria and funding levels change annually, so it is worth checking even if you have been turned down in the past.

Energy Performance Certificate (EPC) Requirements

From 2025, the government has tightened EPC requirements for rental properties, with a minimum rating of C now required for new tenancies. This has created significant demand for window replacements among landlords. If you are a landlord with properties rated D or below, investing in new windows is not just energy-efficient — it is a legal requirement.

Modern uPVC casement windows achieve A+ energy ratings as standard, while premium aluminium systems from Cortizo and Schuco deliver U-values as low as 1.0 W/m2K with double glazing. Either option can dramatically improve an EPC rating.

What If You Don't Qualify for a Grant?

Even if you do not meet the eligibility criteria for government grants, there are several ways to make window and door replacements more affordable:

• 0% finance: Many installers, including Vitrum Solutions, offer interest-free finance over 12-24 months on qualifying orders
• Green mortgages: Several UK lenders offer preferential rates or cashback for properties with high EPC ratings
• VAT reduction: Energy-saving materials including insulation and some glazing products currently benefit from a reduced 0% VAT rate (extended through 2027)
• Phased replacement: Replacing windows room by room spreads the cost over several months or years

How Much Can You Save with New Windows?

The savings depend on what you are replacing and what you install. Here are realistic annual energy savings based on Energy Saving Trust data:

• Single glazing to A-rated double glazing: £100-£235 per year
• Old double glazing to A-rated double glazing: £45-£110 per year
• Double glazing to triple glazing: £25-£55 per year additional saving
• Draughty doors to composite or aluminium doors: £30-£75 per year

Over a 20-year period, replacing all windows in a three-bedroom semi-detached house typically saves £2,000-£4,700 in energy bills alone, before accounting for the comfort improvement and property value increase.

How Vitrum Solutions Can Help

We install A-rated and A+-rated windows and doors across Buckinghamshire, West London and the surrounding areas. Whether you are looking at uPVC windows, aluminium casement windows or composite entrance doors, we provide fully itemised quotes with no hidden costs.

If you think you may be eligible for a government grant, we can advise on the process and connect you with the right scheme. Every installation we carry out meets current Building Regulations and comes with a FENSA certificate — which is a requirement for many grant schemes.

Frequently Asked Questions

Can I get a government grant for new windows in 2026?

Yes. The ECO4 scheme funds window and door replacements for qualifying households, typically those on means-tested benefits with properties rated EPC D or below. Local authority schemes and ECO Flex referrals can also provide funding for households that do not meet standard criteria.

How much is the ECO4 grant for windows worth?

ECO4 can cover the full cost of replacement windows and doors, including installation. The exact value depends on your property's current EPC rating and the scope of work required. Properties rated E, F or G typically receive the most comprehensive funding.

Do I have to pay anything towards a government-funded window replacement?

In most cases, ECO4 covers the entire cost for qualifying households. However, some schemes may require a contribution if you choose a higher specification than the standard offering. Always confirm the full terms before work begins.

Can landlords get grants for window replacements?

Landlords with qualifying tenants can access ECO4 funding. Given the new minimum EPC C requirement for rental properties, many landlords are using grants to meet their legal obligations while improving their properties.

What EPC rating do I need for a grant?

Most schemes target properties rated D, E, F or G. The worse your current rating, the more likely you are to qualify and the more comprehensive the funding tends to be. An EPC assessment costs around £60-£120 and is valid for 10 years.

Are there grants specifically for double glazing?

Double glazing falls under the broader category of energy efficiency improvements funded by ECO4 and local authority schemes. There is no standalone double glazing grant, but window replacements are a core part of most energy efficiency funding programmes.