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A complete guide to grants, schemes, and financial support for window improvements in 2026, including the Warm Homes Plan and local authority funding.
Improving your windows is one of the most effective ways to reduce energy bills and increase home comfort—but the upfront cost can be significant. Fortunately, 2026 brings several grant schemes and funding options that London homeowners can access. Here's your complete guide to what's available.
The government's flagship Warm Homes Plan, launched in 2025, continues to offer substantial support for energy efficiency improvements including glazing upgrades.
Processing typically takes 6-10 weeks. Approved installers must be used.
Major energy suppliers are required to fund energy efficiency improvements for eligible households under ECO4, running until 2026.
Contact your energy supplier or search for ECO4 installers in your area. Applications are processed through the installer.
Local authorities can refer households to ECO4 funding based on local criteria, even if they don't receive qualifying benefits.
James Whitfield
Conservation Planning Advisor
Improving your windows is one of the most effective ways to reduce energy bills and increase home comfort—but the upfront cost can be significant. Fortunately, 2026 brings several grant schemes and funding options that London homeowners can access. Here's your complete guide to what's available.
The government's flagship Warm Homes Plan, launched in 2025, continues to offer substantial support for energy efficiency improvements including glazing upgrades.
Processing typically takes 6-10 weeks. Approved installers must be used.
Major energy suppliers are required to fund energy efficiency improvements for eligible households under ECO4, running until 2026.
Contact your energy supplier or search for ECO4 installers in your area. Applications are processed through the installer.
Local authorities can refer households to ECO4 funding based on local criteria, even if they don't receive qualifying benefits.
Contact your local council's housing or environmental services team for details.
If you live under a Heathrow flight path, you may qualify for free or subsidised acoustic glazing.
Check eligibility and apply through the Heathrow Community Noise Forum website or call Heathrow's community relations team.
Period properties may access heritage-specific funding:
Some London boroughs offer small grants for listed building maintenance:
Certain energy-saving installations qualify for reduced VAT rates:
Secondary glazing typically attracts standard 20% VAT as it's classified as a window product rather than insulation material. However, some installations as part of wider energy efficiency packages may qualify for the reduced rate. Ask your installer for clarification.
While not grants, several schemes offer interest-free borrowing:
Private landlords face mandatory EPC requirements and can access:
While we don't process grant applications directly, we can:
Request a quote and let us know if you're applying for grant funding—we'll ensure our documentation supports your application.
Call 020 7060 1572 to discuss your options.
London's leading secondary glazing specialists for Grade I, Grade II, and Conservation Area properties. Every project begins with a complimentary heritage survey.
