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Cavity Wall Insulation Grants

Check To See If You’re Eligible For Cavity Wall Insulation Grants Below

Check your eligibility - it only takes 60 seconds


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What Cavity Wall Insulation Grants Are Available?

Stick with ZOA Energy Solutions, and we’ll guide you through all of the grant options that might be relevant to you. As insulation grant experts, we’re always keeping on top of any changes to the various grant schemes out there. So contact us today for the latest grant information, or else read on below for a brief overview of each insulation grant.

Cavity Wall Insulation Grant/Funding List

  • Great British Insulation Scheme
  • ECO4
  • LA Flex
  • 0% VAT

Get Cavity Wall Insulation Installed With Eco Grants

Unfilled cavity walls could be costing you £100s each year. Cavity wall insulation can help your home stay warmer for longer and therefore significantly reduce the amount you spend on energy to heat your house up.

But did you know there are grants out there that could mean you qualify for a free cavity wall insulation government grant (or at the very least, have the majority of the cost covered by a grant)?

To find out if there are any grants out there for you, all you need to do is fill out our quick 60 second form.

After that, a member of our expert team will be in touch to discuss the eligibility criteria you meet for different grants and to advise you further about your next steps. If you qualify, we can also carry out the installation for you!

Is Cavity Wall Insulation Worth It?

For most people, yes! Insulation in your cavity walls will bring plenty of benefits your way, and it’s much cheaper than installing insulation on your external walls, for example. But there’s no denying that there are certain things you’ll need to consider before opting for this type of insulation over loft insulation or insulation for solid walls, etc, so it’s worth weighing the options up against one another to see if cavity wall insulation is the right eco home improvement for you.

pros and cons of cavity wall insulation


  • Makes your home moreenergy efficient.
  • Lowers energy bills.
  • Helps control rising energy prices.
  • Greener way to live with less carbon emissions from your home.
  • Relatively cheap to install (and even cheaper/free insulation with cavity wall insulation grants).
  • Gives you a more comfortable home to live in.
  • Quick and easy to install.


  • Not suitable for all homes – especially if you live in a property that was built before the mid 1920s. During this time, solid walls were used rather than cavity walls, so there was no gap between your inner and outer wall that could be filled with insulation materials. Check your energy performance certificate if you’re unsure – it will usually mention whether cavity wall insulation has been installed or not.
  • Cavity wall insulation that gets damp won’t work so you’ll need to ensure the insulation is professionally installed.

If cavity wall insulation is right for you, then you’ll want to learn more about the different grants available below.

Does This Apply To You?



Find out in 60 seconds if you qualify!

What Is The Great British Insulation Scheme (GBIS)?

Formerly known as ECO+, GBIS began in summer 2023, and will last until March 2026. It aims to help over 300,000 homes in Great Britain with £1 billion in funding to support the least energy efficient homes. Free cavity wall insulation is possible here, but how much you’ll receive towards the cost of your installation will be decided on a case by case basis. For most, it will be free. For some, you may have to pay a little towards the cost yourself.

The Great British Insulation Scheme Eligibility Criteria

As the aim of the scheme is to support the most vulnerable households in Great Britain living in energy inefficient homes, you’ll need to meet criteria that reflect that. You must be:

  • Living in a home with an Energy Performance Certificate (EPC) rating of D-G, AND
  • Living in council tax band A-D in England, A-E in Scotland and Wales


  • Be receiving means tested benefits AND
  • Have an EPC rating of D or below

How Much Can GBIS Save Me?

Because the UK government is targeting the least energy efficient homes, the savings you could see with proper cavity wall insulation are much higher – around £300 to £400 annually according to the government’s own estimates.

That could significantly improve your financial situation and help control the amount you spend on energy bills each year.

What Is The ECO4 Cavity Wall Insulation Grant?

ECO4 covers a range of eco home improvements made on energy inefficient homes with low income occupants to better support them in bringing their energy bills back under control and reduce the carbon emissions produced by these homes. First introduced in April 2022, the scheme will offer £4 billion in total between then and March 2026 – and cavity wall insulation is part of what’s being funded. In order to qualify you’ll need to meet the following criteria.

ECO4 Eligibility Criteria

  • You’re in receipt of government benefits OR someone in your household/a tenant is (a list of applicable benefits can be found below)
  • You have an inefficient heating system with a D-G energy efficiency rating
  • You receive child benefit AND your household income falls below a specific threshold (more on this below)

Applicable Government Benefits

  • Income-Based Jobseekers Allowance
  • Income-Related Employment & Support Allowance
  • Income Support
  • Pension Credit Guarantee 
  • Working Tax Credit
  • Child Tax Credits 
  • Universal Credit
  • Housing Benefit
  • Pension Credit Savings
Cavity wall insulation funding list

Child Benefit Household Income Thresholds

If you’re in receipt of child benefit and have a household income less than the numbers shown below then you should be eligible for ECO4 funding for your cavity wall insulation:


1 Child

2 Children

3 Children

4+ Children

Single-Parent Households





Two-Parent Households





Does This Apply To You?



Find out in 60 seconds if you qualify!

What Is The LA Flex Cavity Wall Insulation Grant?

LA Flex (or the Local Authority Flexible Eligibility Scheme) is designed to give local authorities and councils greater flexibility when offering insulation grants, so they can better target the homes in their communities that need the most support – even if they don’t qualify for support under ECO4 or the Great British Insulation Scheme.

The aim is still to target the most vulnerable households in the least energy efficient homes, so there are still some eligibility criteria that must be met in order to qualify for cheaper or free cavity wall insulation here.

LA Flex Eligibility Criteria

The eligibility criteria can be different from one council or local authority to the next, but generally if you have a household income of less than £31,000 and you’re living in a house with an EPC rating of E or less, then you’ll probably qualify.

Alternatively, any of the following may also mean you’re eligible for cavity wall insulation support under LA Flex – you must meet 2, whilst also living in a home with an energy rating of E or less:

  • Live in LSOA 1-3 area (an area recognised as an area of deprivation in the UK)
  • Receive Council Tax rebates due to low income
  • You, or someone you live with, are considered vulnerable to living in a cold home according to NICE guidance
  • Referred to LA Flex by the Local Authority Delivery (LAD) Scheme
  • Members of the household are in receipt of free school meals
  • Citizens Advice, your energy supplier, or your mortgage lender have advised you to seek support from government schemes to control mortgage/utility bills

How Does 0% VAT On Insulation Help You?

The UK government has applied 0% VAT on all Energy Saving Materials in the UK – and this applies to cavity wall insulation, too. First introduced in April 2022, 0% VAT on insulation is set to last until the end of March 2027.

This is automatically applied on any qualifying purchase, so you don’t have to apply through a scheme or anything – you just get to enjoy cheaper cavity wall insulation, which will help stretch those government grants even further.

Why Trust Eco Grants By ZOA Energy Solutions?

We’re a team of eco home improvement installers, but more than that, we’re passionate about saving our customers money. That’s why, in addition to being experts at installing a range of eco home improvements, we’ve become experts in grants, too.

Work with us, and we’ll be able to advise you further about the different cavity wall insulation grants that may be available to you. All you need to do is fill out our quick form, and we’ll be back in touch with some more information. If you’re thinking about installing cavity wall insulation anyway, then it just makes sense to check if a grant could cover it for you, right?

And all you need to do? Fill out a quick form and we’ll be in touch as soon as possible!

Cavity Wall Insulation Grants FAQs:

No. Not everybody will be eligible for a grant, and even those that are might not have the full cost of cavity wall insulation covered. 

Still, it’s worth bearing in mind that cavity wall insulation is one of the cheapest and quickest ways to make your home more energy efficient. So even if you have to pay, it hopefully won’t break the bank!

As long as the building is standing. Or, that’s how long it’s supposed to last. If the home falls into disrepair and the cavity wall insulation gets damp, then you’ll need to replace it. Cared for properly, though, it will last for the entire lifespan of the building. 

Each grant is different. But if you contact us today, our friendly expert team will be able to guide you further and advise you about the specific grant application process that’s relevant to you. 

It’s difficult to say how much insulation for cavity walls will cost in the UK, because it all depends on things like the size of your property and the type of your property. A large detached property will cost significantly more to insulate than a small mid terrace, for example.

On average, though, cavity wall insulation will cost around £1000-£4600 (prices correct as of October 2023) according to Energy Saving Trust.

Remember, with the support of free cavity wall insulation government grants, the Energy Saving Trust estimates may be irrelevant to you because it could cost even less – or nothing at all! It’s also worth remembering the significant savings you’ll be making on your energy costs, too, meaning anything you do spend on cavity insulation will be recuperated in savings on your heating bills.