Double Glazing Grants In The UK: A Complete Guide (2025)

• ECO4 upgrades your windows to double-glazed windows if you are…:
  • Replacing single-glazed windows with new double or triple glazing.
  • Replacing old or inefficient double glazing with new, better-performing sealed units.
• Additional ECO4 measures you may qualify for can be found from Ofgem’s ECO4 Guidance on New Measures and Products (see page 71).

Most households that qualify pay nothing at all. However, in some cases, the grant does not cover the full cost of the upgrade. Most often, payments are for properties that need extra work or repairs in preparation for the energy efficiency measures to be delivered.

You may be eligible for ECO4 if you meet the following requirements:

• You own your own home or have permission from your landlord
• You live in England, Scotland, or Wales
• You’re eligible to receive one of the benefits:
  • Child Benefit
  • Pension Guarantee Credit
  • Income-related Employment and Support Allowance (ESA)
  • Income-based Jobseeker’s Allowance (JSA)
  • Income Support
  • Universal Credit
  • Housing benefit
  • Pension Credit
  • Savings Credit

The ECO4 Scheme is intended for properties that require energy efficiency upgrades. This is determined by an assessment from an installer. This means you cannot apply for this grant yourself. An accredited installer must apply on your behalf.

Don’t receive one of those benefits? You could still qualify for ECO4 Flex if you:

• You live in a property that requires energy efficiency upgrades and:
  • You have a combined gross annual household income under £31,000
  • OR A person in your household has a severe or long-term health condition that is adversely affected by living in a cold home, and is due to one of the following:
    • a cardiovascular condition,
    • a respiratory disease,
    • limited mobility
    • Immunosuppression
• Local Authorities (LAs) or Devolved Administrations (DAs) can also use other criteria to identify low-income, vulnerable, and fuel-poor households who qualify for ECO4 Flex.

LAs and DAs can refer vulnerable households who don’t qualify for ECO4 but may still benefit from energy efficiency improvements. If the referral is picked up by an accredited installer, an assessment still must be carried out to see what specific measures are needed.

The Warm Homes Local Grant offers a grant for 2 types of upgrades:

1. £15,000 for energy performance upgrades (e.g. double/triple glazing, draught-proofing, insulation, solar panels, battery storage, etc)
2. An additional £15,000 for installing low-carbon heating (e.g. heat pumps)

You must meet the following requirements to be eligible for the Warm Homes Local Grant:

• Are in England
• Are privately owned (owner-occupied or privately rented)
• Have an Energy Performance Certificate (EPC) between D and G
• Are low-income and meet one of the following criteria:
  • Earn a gross annual household income of £36,000 or less
  • Live in deprived areas (ranked in the lowest income deciles)
  • Receive means-tested benefits (like Universal Credit or Housing Benefit)

Do you meet the eligibility criteria? Or are you unsure if your circumstances match the requirements? You can check your eligibility on the Warm Homes Local Grant website. If eligible, your application will automatically be sent to your Local Authority to handle the next steps.

The amount of grant or loan you can receive depends on the energy upgrade measures you want to make.
The maximum grant you can receive is £15,000. The 2 main types of upgrades you can receive are:

1. Up to £7,500 for 75% of the cost of energy efficiency improvements (e.g. insulation)
2. Up to £7,500 for clean heating systems (e.g. heat pumps)

Tip! If you live in a rural area, you can apply for extra grant funding to receive an extra £1,500 per upgrade type.

Do your costs go above the grant amounts? Home Energy Scotland also offers an interest-free loan to help you pay the additional costs. Some improvement measures, like improving single-glazing windows to double glazing, are only eligible for a loan. In this case, you can get a loan up to £8,000 for improving single-glazing windows. This does not cover the double glazing cost of replacing or improving existing double glazing.

Window upgrade loans cover 75% of costs, while homeowners contribute 25%. Draught-proofing is eligible for £500 in combined funding but must accompany a primary measure like cavity wall insulation or heat pump installation.

You must meet the following criteria to be eligible for Home Energy Scotland:

• You’re a homeowner in Scotland
• The upgrade measures you want to take are recommended in one of the following reports for your home:
  • Energy Performance Certificate (EPC)
  • Home Energy Improvement Report
  • Home Renewable Selector Report

You are NOT eligible if you any of the following:

• A private landlord
• A business
• A property developer

To participate, homeowners must secure a written loan offer and quotes from approved installers before starting work. The scheme categorises upgrades as primary or secondary measures, with funding determined case-by-case.

Do you meet the eligibility criteria? You can apply by contacting Home Energy Scotland by phone (0808 808 2282) or using their contact form on their website. An adviser will ask you questions about you and your home to evaluate what measures you’re eligible for. Then you will receive a personalised application form to fill in.

In most cases, the improvements you receive are free. In some rare cases, you may need to pay for costs that exceed the programme. In these cases, an interest-free loan from Energy Saving Trust is available for you.

This programme offers grants of up to £10,000 for eligible households to make energy-saving home improvements. For instance, you could get funding for:

• Wall insulation
• Loft insulation
• Draught-proofing
• Heat pumps
• Gas boilers

Note: It does not cover new windows or double glazing in Scotland or new windows, but it does cover secondary glazing and uPVC door replacements.

To be eligible for Warmer Homes Scotland, you must meet the following eligibility criteria:

• A resident of Scotland
• A homeowner
  • OR private sector tenant in Scotland who has lived in their home for at least 6 months
• In receipt of benefits and over 16 years old
  • OR if the benefit recipient is under 16 years, then you’re the main householder
  • OR you over 75 years of age and have no working central heating
  • OR you’re in recipient of SR1/DS1500/BASRiS (issued to people with a terminal illness)

While free double glazing isn’t directly offered, the scheme contributes to other energy-saving measures like loft and wall insulation, central heating system upgrades, and renewable energy systems. Interested homeowners can check their eligibility through the Warmer Homes Scotland self-assessment tool or by contacting the scheme directly. Once you confirm your eligibility with the tool or an adviser, your details are referred to a Warmworks assessor who will assess your home and recommend which energy-saving home improvements are right for your home.

With the Affordable Warmth Scheme, you may receive up to £7,500 for energy efficiency measures (including new windows in Northern Ireland) and up to £10,000 if your home is of solid wall construction and needs insulation.

This scheme takes a whole-house approach. This scheme should not be thought of as a “windows-only” scheme. While you can have your single-glazed windows replaced and your doors/windows can get draught-proofing, you must get the improvement measures in the Affordable Warmth Scheme’s priority order:

• Priority 1: insulation and draught proofing
• Priority 2: heating systems
• Priority 3: windows
• Priority 4: solid walls

You will be offered energy efficiency measures for more than one priority group, and the measures need to be carried out in order of priority.

To qualify for the Affordable Warmth Scheme, you must meet the following criteria:

• Live in Northern Ireland
• Own and occupy your property as your main home
  • OR rent from a private landlord
• Have your day/life interest in the house
• Have a total annual gross income of less than £23,000

To apply, homeowners contact NI Energy Advice Service (NIEAS) by phone (0800 111 44 55) or email ([email protected]). You must provide supporting documents that prove the following:

• Ownership or private tenancy at the property
• The landlord’s consent for work to take place on the property
• That you occupy the property as your main residence
• Your income

Yes, in the UK there are multiple schemes that could qualify you for a grant. These include ECO4, the Home Upgrade Grant, and the Home Energy Scotland Grant.

While it depends on the specific scheme, most grants in the UK are means-tested for low-income residents. Many are contingent on being a recipient of benefits such as Income Related Employment & Support Allowance (ESA) or Income Support (IS), or living in social housing.

Yes, landlords can apply for many Many are window grants. All grants require the permission of the landlord before moving forward.

You may not qualify for a window grant if you already have double-glazed windows. Most grants are for replacing single-glazed windows or upgrading old windows to double-glazed.