CWI INSTALL

Cavity wall insulation

We are the largest manufacturer of eps bonded bead CWI in the UK. Our superbead is designed and manufactured to make your home as thermally efficient as possible.

energystore has been manufacturing and installing cwi insulation in Northern Ireland for over 40 years. We are the largest installer of cavity wall insulation (cwi) throughout Northern Ireland and the Republic of Ireland providing services to existing homeowners and new build customers. We only employ NVQ2 qualified insulation specialists to carry out installs of our own product, energystore superbead.

We also manage grant funding for homeowners in Northern Ireland under the Northern Ireland Sustainable Energy Programme (NISEP), ensuring affordable cavity wall and loft insulation is available to people throughout the Province. To find out if you are eligible for NISEP grant support, please click here to see the eligibility criteria.
Mr. F
Londonderry/ Derry
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It was a great job. The Workmen were neat, tidy, quick and professional and loved a wee cup of tea. Heat in the house is fantastic. We only need it on for half an hour and the house is lovely and warm . Many thanks to energystore.
Mr. B
Craigavon
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Absolutely brilliant. I can come into the house at anytime of the day now and the house will be warm and cosy. The heat doesn't need to be on for long and it holds the heat from the previous time. Really appreciated the work and a big thank you to energystore.
Mrs. T
Belfast
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Job couldn't have been better. Only problem now is the house is so warm and cosy, then you go outside and its freezing. I would recommend energystore to everyone!.
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Is my house suitable for CWI?

If your wall has a cavity it may be suitable if there is at least a 40mm gap in the cavity, the cavity is free from debris and the walls have been well maintained.

How long will it take to install CWI?

It usually takes our trained operatives around two hours on site to complete an installation but, it can take longer for large houses.

How much will I save on heating?

The amount saved on your heating bill depends on the size of your house and heating type but, typical homes can save up to £250 a year.

Are there grants available?

In Northern Ireland there are grants available through the NISEP scheme. Contact us to see if you may be eligible.

Get in touch with us

To find out about grants and to see if you are eligible call 0800 0283 046 or send us a message below.


"There had been a lot of damp in the rooms and a smell in the house. It was quite hard to heat, making it an uncomfortable home. The house is warm now, no sign of damp and we're looking forward to seeing a difference in our fuel bills."

Ms M, Belfast