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Updated: 20 May 2022

Free insulation deals from energy suppliers

Can you get free insulation? Insulating your home is one of the most effective ways to cut your energy bills. Find out how your energy supplier could help.
Which?Editorial team
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Some energy suppliers offer free insulation and free boilers to eligible households. Read on to find out if you qualify.

You could save up to £150 a year on your energy bills by insulating your loft, and £165 with cavity wall insulation if you live in a semi-detached house. Both can cost hundreds of pounds upfront to install, so it's worth checking whether you can get free insulation from your energy supplier first.

Read about the different types of insulation available to make your home more cosy.

What free insulation can I get?

Some suppliers offer free insulation if you're eligible under the ECO scheme. For example, you may be eligible if you're on government benefits. But suppliers will also take into account how much your home will benefit from insulation.

The Green Homes Grant scheme will also provide free insulation to households in the lowest-income groups (you will need to be in receipt of certain government benefits). If you don't qualify for this, the scheme will also provide vouchers for at least two thirds of the cost of some types of insulation for homeowners in England. Find out more about the Green Homes Grant, available from September 2020.

If you're concerned about your energy bills, it's worth seeing how much you could save by comparing gas and electricity prices using our free energy comparison price website, Which? Switch. If you're on a standard tariff at the level of the price cap with one of the Big Six energy suppliers, you could save more than £200 a year by switching to a better deal. 

EDF Energy: free insulation or subsidised boiler for customers

What can I get? Loft insulation, cavity wall insulation or a replacement A-rated gas boiler if yours is broken.

Who is eligible? EDF customers who either own their home or rent it privately and have an EPC rating of A-E. You, or someone in your household, must also receive one of the qualifying benefits (see EDF’s website for the full list).

Subsidised boilers are only available for homeowners. Your home will be assessed for suitability for insulation and whether you qualify for a boiler. You will need to contribute £240 towards fitting the new boiler.

How can I apply? Call 0333 200 5119.

Eon: free insulation or discounted boiler if on selected benefits

What can I get? Free loft insulation and/or cavity wall insulation. A boiler for £395 if yours is broken or faulty.

Who is eligible? Eligibility is based on whether you or someone else living at your property receive certain benefits (and therefore qualify for the Affordable Warmth Scheme). You must own your home to get a boiler replacement. You don’t have to be an Eon customer.

How can I apply? Online or call 0330 400 1083.

Npower: free or subsidised insulation and boilers

What can I get? Free loft insulation, cavity wall insulation, or a boiler for £395 through Eon (Npower is part of the Eon Group).

Who is eligible? You'll need to own your home and receive certain benefits to be eligible, but you don't have to be an Npower customer.

How can I apply? Online.

British Gas, SSE and Scottish Power

Neither British Gas, SSE nor Scottish Power currently offers free insulation or boilers.

Some companies’ schemes are currently on hold while the legislation behind them changes. They are backed by the Energy Companies Obligation (ECO).

Discounts on DIY insulation products

If you decide to install your own loft insulation, look out for the Energy Saving Trust logo to ensure you're buying insulation products that have been through a quality-control process and comply with building regulations. 

You can buy loft insulation from shops such as B&Q and Homebase, and it typically costs between £16 and £30 for a roll. 

Find out how B&Q and Homebase fare in our rankings of the best and worst high street shops and best and worst online shops .

What type of insulation do I need?

To work out which type of insulation is right for your home, read our guides to loft insulation and cavity wall insulation.

Before taking up any deal, you'll need to read the small print for each insulation offer to make sure both you and your home are eligible. Companies typically need to be able to insulate at least two thirds of your loft space, and exclude properties with more than 100mm of loft insulation already in place. 

You may not be eligible if you live in a rented property, flat or maisonette, or a housing association or council property. Most deals also only apply only to people living in mainland Britain. You may need to pay towards the cost of your 'free' insulation if you live in a particularly large or unusual house.

Heating alternatives

You could also take a look at our guides to wood-burning stoves, underfloor heating and solar panels to find out more about these alternative - and potentially cheaper, -forms of heating. 

If you only need to heat a specific area – your living room while you watch TV in the evening, for example – you could consider an electric heater. Make sure you get one that doesn't rack up your energy bills using our guide on the best electric heaters.