Get free insulation for your home

90% of homes needing insulation will get it free from British Gas[1]

Check my home is suitable

What is home insulation?

Save money every single year with loft and cavity wall insulation

Insulation helps prevent heat escaping from your loft and walls in your home. A well insulated home can significantly reduce heat loss while lowering your heating bills.

Check my home is suitable

Why is it free?

As part of the Energy Companies Obligation, we're working with the government to reduce the UK's energy consumption - by giving free insulation to households like yours. You don't have to be a British Gas customer and you don't need to buy anything from us. You can get free insulation even if you're renting. Just ask your landlord first.


3 simple steps to free insulation

1. Check suitability

Answer a few simple questions to find out if your home is likely to be suitable.

2. Energy Expert visit

We will conduct a Home Insulation Survey to make sure your home will benefit from insulation.

3. Installing your insulation

If your home is suitable you can book your insulation appointment. The installation will take less than a day.

How much could I save every year?

Cavity wall insulation

Annual saving









Loft insulation (0-270mm)

Annual saving









(Source: This is what the Energy Saving Trust estimate. you can find out more at

Why choose British Gas?

We've already installed free insulation in over 2 million homes over the last 5 years, so we have plenty of experience.

  • All the work is carried out by qualified installers, approved by British Gas.
  • You don't have to be a British Gas customer, or buy anything from us.
  • You don't need to be on benefits or live in a certain area.
  • 90% of homes that need it will get it for free [1].
  • Hassle free installation and we tidy up after.

Check my home is suitable

Learn more about free insulation

British Gas home insulation - what to expect

Cavity wall insulation

Lisa talks about her experience of having cavity wall insulation fitted with British Gas.

Loft insulation

Alison describes how free loft insulation from British Gas has improved her welfare.

Home insulation service

Brodie talks about his experience of the home insulation service from British Gas.

Little extras with British Gas

During your installation our engineers can offer additional free insulation*depending on your home's needs. We can:

  • Insulate any hot water cylinder without a factory fitted jacket.
  • Draft proof the loft hatch.
  • Insulate any cold water tanks in the loft space using a 25mm tank jacket with a rigid lid.
  • Insulate any pipework in the loft space using 22mm pipe insulation.

*Dependent on survey

Check my home is suitable

Learn more about loft insulation

Loft insulation is a thick material that is usually rolled onto the loft floor. It acts like a blanket, helping to prevent up to 25% of heat escaping through the roof.

Reduce heat loss - up to 25% of heat is lost through uninsulated roofs.

The benefits of loft insulation

  • With loft insulation you could save as much as £140 [2] a year.
  • Insulating your home takes less than a day.
  • You could see the difference in your bills immediately.

Do I need loft insulation?

Homes built before 1991 may need loft insulation


If your loft looks like this we could insulate it.

Check suitability


If you can see your beams, your home might benefit from more insulation.

Check suitability

Learn more about cavity wall insulation

Cavity wall insulation is a filling blown into the gap between your interior and exterior walls. It acts as a blanket to help stop heat escaping through the walls of your home.

Reduce heat loss - up to 35% of heat is lost through uninsulated walls.

The benefits of cavity wall insulation

  • With cavity wall insulation you could save as much as £160 [2] a year
  • Saves around 600kg [2] of CO2 every year, reducing your impact on the environment.
  • Insulating your home takes less than a day.
  • You could see the difference in your bills immediately.

Do I need cavity wall insulation?

Any home built after 1st January 1983 should already have cavity wall insulation installed. If your property has solid walls then you would need external wall insulation.


If your walls looks like this we may be able to insulate them.

Check suitability


If your walls look like this they're already well insulated.

Energy saving tips

Find out more about other types of insulation

Solid wall insulation

Solid wall insulation is suitable for houses with solid walls which tend to let more heat escape than cavity walls. Houses built before 1920s usually have solid walls.

Solid wall insulation is a layer of insulation fixed to the outside walls of your home and covered with a special render. It helps reduce the heat travelling through your home's walls, keeping it warmer in winter and cooler in summer.

Find out more

Insulation for tenants

If you’re a tenant living in private, rented accommodation you could be eligible for free insulation.

Call us to check if you qualify:

0800 294 0237[3]

We're here to help

Frequently asked questions

Q.I already have some loft insulation - do I need any more?

A: If you already have some loft insulation then you may need to have it topped up. If you have less than 3 inches of insulation it's worthwhile having a survey carried out to make sure you have the right amount.

Q.Will I notice any changes once my home has been insulated?

A: You will notice an immediate difference within your home once you have had insulation carried out. Your home will be warmer in the winter and cooler in the summer.

Q.If I don't own my home, will I still be able to have insulation?

A: If you live in a rented property, you will need to obtain your landlord's permission in writing to confirm that they are happy for cavity wall insulation to be installed..

[1] There are a few areas of the country we can’t reach. Modern houses are built with insulation – check the details on our website. We give free insulation under the Energy Companies Obligation and we’ll need to do a survey to make sure your house qualifies. We’ll cover the cost of the insulation itself and some scaffolding and vents, but if your house needs specialist equipment, you may need to contribute to the cost. If you rent your house, you’ll need your landlord’s written permission.

[2] Savings figure source  and August 2014. Actual savings depend on individual circumstances.

[3] Phone lines are open 8am–8pm Monday to Friday and 8am–4pm on Saturday. Closed on Bank Holidays. Calls are free from a BT landline, however charges from mobile phones and other networks may vary. Calls may be monitored and/or recorded for quality assurance and compliance purposes.