Help reduce your energy bills by up to £135 a year[1]

Cavity wall insulation stops heat you’re paying for escaping through the walls of your home as well as keeping your home warmer in winter and cooler in summer. It helps you use less energy which could save you money on your heating bills – up to £135 a year[1].

It's quick and easy to install – we can do it from outside your home in just a few hours. We do this by fitting an insulating fibre blanket in the space between your inner and outer walls, reducing heat loss by up to a third. As well as keeping your home warmer in winter, it can keep it cooler in summer too.

Insulating your walls and saving money is easy

The benefits of fitting cavity wall insulation with us:

  • We’ll carry out a free survey so you’ll know what’s involved and how much it will be.
  • It’s quick, easy and hassle free, we can do it from outside your home in just a few hours.
  • You can collect 400 Nectar points[4] when you buy cavity wall insulation through us.
  • You could get it free if you're 70 or over[1] – or if you receive eligible benefits.
  • State Pension Credit
  • Child or Working Tax Credit (income no more than £16,190)
  • Council Tax Benefit
  • Disability Living Allowance
  • Disablement Pension (includes Constant Attendance Allowance)
  • Housing Benefit
  • Income Support
  • Income-based Job Seekers Allowance
  • Income-related Employment and Support Allowance
  • Attendance Allowance
  • War Disablement
  • Pension (which includes Mobility Supplement or Constant Attendance)

How much it costs and how much you could save

Cost of insulation Saving on your yearly heating bill Nectar points
£189[1] £135[1] 400[4]

Costs and savings are based on an average sized 3 bed semi-detached property with gas central heating and no existing loft insulation. Our Energy Experts will give you an accurate price based on the size and age of your property, and your own energy consumption as part of your initial survey.

Read our terms and conditions for home insulation

Ready to arrange an appointment or need more help?  Call 0800 077 3831[2]

Top tips to help you save energy

View simple ways to help cut down on your energy use and save money around your home.

Read our energy saving tips

Stop heat escaping through your roof

Loft insulation could save you up to £175[1] a year and takes just a few hours to install.

 

Find out more about loft insulation

[1] British Gas install in mainland GB only. Subject to availability and survey. Not all homes are suitable for loft and/or cavity wall insulation. Prices based on an average sized 3 bedroom semi-detached home. Prices may vary and exclude any scaffolding, vents or specialist equipment. Free insulation is subject to square meterage limitations, insulation beyond these limits is chargeable. Offer only applies where the thickness of existing insulation is less than 60mm. Offer excludes scaffolding and any specialist equipment. Customers will only be eligible for free measures where we can insulate a minimum of two thirds of the available loft space (when applied to the whole loft surface area) or available cavity wall space (when applied to the whole house). Applicants only eligible for measures recommended by appointed surveyor. Proof of age or receipt of benefits may be required Offer cannot be used in conjunction with any other offer. Savings figure source www.energysavingtrust.org.uk/Energy-saving-assumptions , October 2011. Actual savings depend on individual circumstances.

[2] Your calls may be recorded and /or monitored for quality assurance and compliance purposes. Phone lines are open Monday to Friday between 8am and 8pm and on Saturdays from 8am to 6pm. We’re closed on Sundays and Bank holidays.

[3] We’ll be in touch within 48 hours.

[4] You need to be an existing Nectar account holder and register with Sainsbury's Energy to collect points. 400 points for each loft or cavity wall installation will be applied to your Nectar account 7 working days after completion of the installation. Offer may be amended or withdrawn at any time without notice and cannot be used in conjunction with any other Sainsbury's Energy offer. Terms and conditions apply. See sainsburysenergy.com/nectarterms for details.