Secondary Glazing Grants UK 2026: Every Scheme You Can Apply For

Secondary glazing isn't cheap — but you might not have to pay the full cost yourself. In 2026, several UK government programmes, local council schemes, and heritage funding streams can subsidise or fully cover the cost of secondary glazing installation.

Here's every scheme currently available, who qualifies, and how to apply.

1. ECO4 (Energy Company Obligation)

The ECO4 scheme requires large energy suppliers to fund energy-efficiency improvements in eligible homes. Secondary glazing qualifies as a "glazing measure" under the scheme.

Who Qualifies?

• Homeowners or private tenants on certain means-tested benefits (Universal Credit, Pension Credit, Child Tax Credit, etc.)
• Homes with an EPC rating of D, E, F, or G
• Properties in England, Scotland, or Wales

What's Covered?

• Full cost of secondary glazing installation in most cases
• The scheme runs until March 2026 — applications are still being accepted but funding is limited

How to Apply

Contact your energy supplier directly or use the government's Simple Energy Advice service. An assessor will visit your property to confirm eligibility.

2. Great British Insulation Scheme (GBIS)

Launched in 2023 and extended through 2026, the GBIS specifically targets single-glazed properties in council tax bands A–D.

Who Qualifies?

• Homeowners in council tax bands A–D (England) or equivalent bands in Scotland and Wales
• No income requirements for the "general eligibility" route
• Properties must have identifiable glazing deficiencies

What's Covered?

• Grants of up to £6,000 toward glazing improvements
• Secondary glazing is explicitly listed as an eligible measure

How to Apply

Apply through your energy supplier or a TrustMark-registered installer. We can help check your eligibility during a free survey.

3. Local Authority Grants

Many London boroughs and UK councils offer their own grants for energy efficiency or heritage preservation:

London-Specific Schemes

• Westminster City Council: Discretionary grants for listed building improvements including secondary glazing
• RBKC (Royal Borough of Kensington & Chelsea): Heritage improvement fund for conservation area properties
• Camden Council: Energy efficiency top-up grants for owner-occupiers
• Hackney Council: Warm Homes Fund — secondary glazing eligible for qualifying households

How to Find Your Local Scheme

Check your council's website under "energy efficiency grants" or "home improvement grants." Schemes change annually, so it's worth calling directly.

4. Heritage Lottery Fund / Historic England Grants

If your property is Grade I or Grade II listed, you may qualify for heritage-specific funding:

Historic England Repair Grants

• Available for urgent repairs to listed buildings
• Secondary glazing can qualify as a "conservation-appropriate thermal improvement"
• Grants typically cover 50–80% of costs

Heritage Lottery Fund

• Community and individual grants for heritage preservation
• Larger properties (churches, community buildings) have higher success rates
• Individual homeowner applications are possible but competitive

5. Green Homes Grant (Local Authority Delivery — LAD)

While the original Green Homes Grant voucher scheme closed in 2021, the Local Authority Delivery (LAD) programme continues to fund energy improvements through councils.

Who Qualifies?

• Low-income households (typically below £31,000 household income)
• Properties with EPC ratings of E, F, or G
• Must be referred through your local council

What's Covered?

• Up to £10,000 per property for qualifying measures
• Secondary glazing qualifies as a "fabric improvement"

6. VAT Reduction on Energy-Saving Materials

Since April 2022, secondary glazing materials and installation qualify for 0% VAT (reduced from the standard 20%) when installed as an energy-saving measure.

Requirements

• The installer must be VAT-registered
• The work must be classified as an "energy-saving material installation"
• Applies to residential properties only

What This Saves You

On a £5,000 installation, the VAT saving is £1,000 — significant and available to everyone regardless of income.

7. Landlord Energy Efficiency Grants

If you're a landlord, additional incentives apply:

• Minimum EPC requirements: Since 2025, rental properties must achieve at least EPC Band C. Secondary glazing is one of the most cost-effective ways to achieve this.
• Tax deduction: The cost of secondary glazing can be claimed as a revenue expense against rental income.
• Enhanced Capital Allowances: Commercial properties can claim 100% first-year allowances on qualifying energy-efficient glazing.

How to Maximise Your Funding

1. Check eligibility for multiple schemes — they can often be combined. ECO4 funding plus the VAT reduction can cover 100% of costs for qualifying households.
2. Get your EPC first — most schemes require a recent Energy Performance Certificate. If your current rating is D or below, you're more likely to qualify.
3. Use a TrustMark installer — most government schemes require work to be done by TrustMark-registered professionals.
4. Apply early — funding is allocated on a first-come-first-served basis and many schemes run out before the deadline.

What If You Don't Qualify?

Even without grant funding, secondary glazing remains excellent value:

• 0% VAT saves 20% on materials and labour (available to all residential properties)
• Energy savings of £300–£500/year offset the investment within 8–12 years
• Property value increase of 1–3% in noise-affected London postcodes often exceeds the installation cost
• Monthly payment plans — many installers (including us) offer 0% interest finance over 12 months

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Not sure which grants you qualify for? Book a free survey and we'll check your eligibility as part of the consultation — no obligation, no hard sell.