Is there a government grant for double glazing in 2026?

No dedicated grant exists. ECO4 can fund double glazing as part of a whole-house energy upgrade for households on qualifying benefits, but you can't apply specifically for a window grant. The 0% VAT on energy-saving materials does apply to all window installations, saving you 20% automatically.

Can I get free windows through ECO4?

Possibly, but not guaranteed. ECO4 prioritises insulation and heating upgrades first. If your home already has decent insulation but still has single glazing, windows are more likely to be included. Contact your energy supplier to find out what measures they'd fund for your property.

Do I pay VAT on new windows?

Not until March 2027. Energy-saving glazing installed in residential properties carries 0% VAT. On a £5,000 installation, that saves you £1,000 compared to the standard 20% rate. Your installer should apply the zero rate automatically.

Are triple-glazed windows worth the extra cost?

For most UK homes, no. Double glazing captures 80% to 90% of the thermal benefit at 60% to 70% of the cost. Triple glazing makes more sense in new builds designed around it, or in very exposed locations. The extra SAP points gained are small relative to the price increase.

Do new windows add value to my home?

Yes. Double glazing is one of the improvements most commonly cited by estate agents as adding value, typically 5% to 10% of property value according to industry surveys. A better EPC rating from new windows also helps, as buyers and tenants increasingly factor energy costs into their decisions.

Window and Door Grants UK 2026

Window and Door Grants UK 2026 | Eco Home Check

You've seen the ads. "Free double glazing from the government!" "Window grants for all UK homeowners!" They're everywhere, on Facebook, in your inbox, on those websites that look vaguely official but aren't.

Here's the truth: there is no dedicated government grant for windows and doors. Not in 2026. See our guide on energy efficient windows grants for more detail. Not through any scheme. The ads are misleading.

What does exist is ECO4, which sometimes includes double glazing as part of a bigger package of energy efficiency improvements. And there's 0% VAT on energy-saving glazing, which knocks a meaningful chunk off the price. But a standalone "window grant" where you apply and get money towards new windows? That doesn't exist. Let's talk about what actually does.

ECO4 and Windows

ECO4 is the closest thing to a window grant in the UK, but it doesn't work the way the ads suggest.

The Energy Company Obligation scheme funds energy efficiency improvements for households on qualifying benefits (Universal Credit, Pension Credit, Child Tax Credit and others) with an EPC rating of D or below. The scheme is delivered through energy suppliers and runs until December 2026, according to GOV.UK.

Here's the catch. ECO4 prioritises measures that deliver the biggest energy savings per pound spent. That means insulation and heating upgrades come first. Double glazing is included in the scheme, but only when it makes sense as part of a whole-house approach. If your loft is uninsulated and your boiler is ancient, your supplier will fund those before touching your windows.

In practice, ECO4-funded glazing happens most often in homes that already have decent insulation and heating but still have single-glazed windows dragging down their EPC. The assessor evaluates your property and recommends the measures that will bring it closest to band C. If windows are the weak link, they get funded.

The honest picture: don't apply to ECO4 expecting free windows. Apply expecting a free energy efficiency upgrade. If windows are part of that upgrade, great. If not, you'll still get valuable improvements to your home.

To check, contact your energy supplier directly and ask about ECO4 measures for your property. Don't pay anyone a fee to "check your eligibility." Legitimate ECO4 assessments are free.

Warm Homes and Windows

The Warm Homes: Local Grant, part of the government's £13.2 billion Warm Homes Plan, is delivered through local councils. It targets homeowners with household income under £36,000 and a property rated D or below.

Some councils include glazing in their funded measures. Others don't. It depends entirely on your local authority's priorities and budget. There's no national list of which councils fund windows, so you need to check directly.

Search for "energy efficiency grants" plus your council name, or call your council's housing or energy team. Ask specifically whether their Warm Homes allocation covers glazing. The scheme runs from 2025 to 2028, per GOV.UK.

If your council does fund windows, the process is similar to ECO4: an assessor visits, evaluates your home, and recommends measures. You don't choose what gets funded. The assessor decides based on what will improve your EPC the most.

0% VAT on Energy-Saving Materials

This one applies to everyone, regardless of income or benefits.

Since April 2022, energy-saving materials installed in residential properties carry 0% VAT instead of the standard 20%, per GOV.UK. Double glazing qualifies. So do secondary glazing panels, draught-proofing materials and insulated doors.

On a £5,000 window installation, the VAT saving is £1,000. On a £10,000 whole-house replacement, you save £2,000. Your installer applies the zero rate automatically. You don't need to apply for anything.

The relief is guaranteed until 31 March 2027. If your installer charges you 20% VAT on energy-efficient glazing, challenge it. The law is clear.

One thing to watch: the 0% rate applies to the supply and installation of energy-saving materials. If you're buying windows and fitting them yourself, the VAT treatment may differ. For most homeowners using a professional installer, the saving is automatic.

How Much Do New Windows Cost Without Grants?

Let's look at realistic 2026 pricing. These figures are based on Energy Saving Trust data and industry averages, with 0% VAT already applied.

Window Type	Per Window	Whole House (10 windows)
uPVC double glazing	£300 to £600	£3,000 to £6,000
Timber double glazing	£400 to £800	£4,000 to £8,000
Aluminium double glazing	£500 to £900	£5,000 to £9,000
Triple glazing (uPVC)	£450 to £800	£4,500 to £8,000

Doors add to the bill. A new uPVC front door costs £600 to £1,200 installed. A composite door runs £800 to £1,500. French or patio doors range from £1,200 to £3,000.

Those prices already reflect the 0% VAT saving. Without the relief, a £5,000 job would cost £6,000 at the standard rate.

Always get at least three quotes. Price differences of 30% to 40% between installers are common, and a higher price doesn't always mean better quality. Check that every quote specifies the window energy rating (look for A+ or A++ rated units) and includes a FENSA or CERTASS certificate, which is required by building regulations.

Do New Windows Improve Your EPC?

Yes, but not as much as you might hope.

Replacing single glazing with double glazing adds 5 to 10 SAP points to a typical home, according to the Energy Saving Trust. That's often enough to jump one band, say from a low D to a high C, or from E to D.

Triple glazing adds a few more points on top, but the cost difference is significant. For most homes, double glazing delivers the bulk of the improvement.

The EPC impact depends on how many windows you replace and what you're replacing. Swapping ten single-glazed windows makes a big difference. Replacing ten-year-old double glazing with newer double glazing? Barely moves the needle.

If your goal is the best EPC improvement per pound spent, windows aren't the place to start. Loft insulation at £300 to £600 gives you a similar SAP improvement to a £5,000 window replacement. Our guide on how to improve your EPC rating ranks every upgrade by cost per SAP point.

That said, if you're already replacing windows for comfort, noise or security reasons, the EPC improvement is a genuine bonus. And a better EPC rating can qualify you for additional grants. A home that jumps from E to D might unlock ECO4 eligibility for further measures — you can find out more about what this means in our EPC Rating D guide.

What About Secondary Glazing?

If you live in a listed building or conservation area where replacing windows isn't allowed, secondary glazing is the alternative. It involves fitting a second pane inside your existing window frame.

Secondary glazing costs £100 to £300 per window, making it far cheaper than full replacement. It adds 2 to 5 SAP points for a whole house and qualifies for 0% VAT. The thermal improvement is less than double glazing but still meaningful, and it's often the only option for period properties. If you're weighing up the full range of ways to reduce heat loss through your walls and floors, our guide to cavity wall insulation covers another cost-effective option worth considering alongside glazing.

Some ECO4 suppliers include secondary glazing in their measures for homes where full replacement isn't practical.

Cutting Through the Ads

If you see an ad promising "free windows" or "government window grants," here's what's actually happening. The company is a lead generator. They collect your details, check whether you qualify for ECO4, and if you do, pass your information to an installer who delivers the work under the scheme. If windows happen to be part of your ECO4 package, you get them. If not, you've just given your phone number to a company that will sell it to someone else.

The red flags:

Any ad that doesn't name a specific scheme (ECO4, Warm Homes) is vague for a reason
Anyone asking for an upfront fee to "check your eligibility" is charging for something that's free
Claims that "all homeowners" qualify are false. ECO4 is means-tested
Websites that look like government sites but aren't (check the URL, genuine government sites end in .gov.uk)

The legitimate route: contact your energy supplier directly about ECO4, check your council's website for Warm Homes funding, and use our eligibility checker to see what you actually qualify for. You may also want to review what's available through the Warm Homes Local Grant, which some councils are using to fund glazing upgrades alongside other improvements.

Open the eligibility checker. Two minutes. You'll see every grant available for your home, including whether ECO4 covers glazing in your area.