Keep the Heat In. Keep the Bills Down.

You may be entitled to a full or partial grant for cavity wall insulation.

Cavity Wall Insulation is one of the most cost-effective ways to improve your home’s energy efficiency — with minimal disruption and immediate impact.

Rear exterior view of a brick house featuring a modern paved patio area, a wooden pergola with seating, glass French doors, and a small brick outbuilding under a clear blue sky.

Why choose Cavity Wall Insulation?

Instant Comfort
Keeps heat inside and cold air out
Energy Savings
Cut heating costs by up to 25–30% beads
Eco-Friendly
Reduce carbon emissions and improve your BER
A BlueBuild installer using specialized equipment to inject cavity wall insulation into a property.
A side view of a dark grey BlueBuild flatbed service truck driving on a rural road, with two technicians visible in the cab against a backdrop of rolling green hills and a cloudy blue sky.
A BlueBuild technician wearing a protective respirator mask, safety glasses, red ear defenders, and a high-visibility vest operating a heavy-duty Hilti rotary hammer drill to core an openings in a concrete block wall.

Our Installation Process

Our expert installation is fast, clean, and typically completed in just one day.
Here’s how it works:

  • We carry out a detailed wall assessment to confirm suitability
  • Small, discreet holes are drilled in the external wall
  • High-performance insulation beads are injected to fully fill the cavity
  • All drill points are carefully sealed to match the original finish
A smiling woman wearing a headset takes notes with a pen while looking toward her open laptop at a wooden desk in a bright office environment.

Northern Ireland Grants for Cavity Wall Insulation

Homeowners in Northern Ireland may be eligible for support through a range of government-backed energy efficiency schemes — helping to reduce or even fully cover the cost of installation.

Available support can include:

  • NISEP (Northern Ireland Sustainable Energy Programme) – including fully funded options for eligible households
  • Affordable Warmth Scheme for lower-income homes
  • Potential support through local council or energy supplier initiatives

Grant levels and eligibility vary depending on your property type, household income, and current energy efficiency rating.

Our team will:

Assess your eligibility during your free survey
Guide you through the most suitable funding options
Handle the application process where applicable

👉 Find out if you qualify for fully funded insulation on our Residential Grants page.

Hear from Our Customers

  • We decided we wanted to get a solar system for the house. So first things first did a bit of research online on local solar companies I had three different companies give me a quote. One of these companies was Bluebuild. First I had a call from a lovely guy called Ian Millar he came to have a look round my property then he sent me through a full layout of what would take place should I go with them. After speaking to the other two companies I found Ian to make the most sense plus I wanted to go with panels on the front and back of the house but Ian insisted that I ONLY needed 12 on the front. This in its self proved that they weren’t money grabbers they told you the truth this is VERY hard to get in this day and age. Anyway I decided that bluebuild was the guys to go with and I’m so glad I did … what a genuine top company I would have given them ten stars… from the guys with the scaffolding arrived to the full install was carried out all totally professional people and all nice guys to boot. Saving on my electric already…I am a very sceptical person and find it hard to trust anyone honestly if your thinking about going down the solar route please don’t go anywhere else this company has to be the best in the six counties. Thanks again Bluebuild👍👍😃👍👍
    Alan McClintock
  • Bluebuild Energy recently insulated my house and upgraded my heating system. I would highly recommend Jason and his team. They were so efficient and professional. 5 stars from me.
    Martin Byrne
  • From the very beginning, we have had excellent communication with Bluebuild. Vassily and his team are very hard workers and Fionn did a great job in the attic. Jason ensured that everything was reinstated perfectly. We are delighted with the job....... Michael and Jenny, Co. Wicklow
    Michael Purcell
  • From start to finish,the team were all excellent. All work done was completed to a really high standard. Jason went above and beyond in ensuring that the work was done quickly and professionally. I cannot recommend Bluebird enough.
    Theresa McLoughlin
  • Just had Bluebuild install a new solar PV and Battery system at our home on North Coast. The process was fantastic from start to finish. Competitive pricing, simple admin and speedy installation. 16 panels over two adjacent roof sections with 2 Dyness 5Kw batteries and a Solis Inverter. Everything is up and running, I’m looking forward to the spring to see it at its full potential. Would definitely recommend Bluebuild Energy Ltd. I had received quotes from a number of companies before settling on Bluebuild who were the most competitive and research recommended them as one of the most experienced and longest established.
    Noel Sargent
Google Reviews
Rated 4.7 out of 5 stars on over 100+ reviews

Accreditations & Partnerships

soltherm logo
Dublin City Council logo
sustainable energy authority of Ireland logo
nsai logo
bba logo
iwa logo
msc logo
terraco logo
utility regulator logo
constructionline logo
Installation Assurance Authority Logo
NQA certification badges for ISO 9001 Quality Management, ISO 14001 Environmental Management, and ISO 45001 Health and Safety Management.

​​Your trusted partner in energy efficiency

​​Your trusted partner in energy efficiency

Cavity Landing Form