What is cavity wall insulation?
Cavity wall insulation fills the gap between your property's inner and outer walls with modern, breathable insulation material. This stops up to 35% of your home's heat from escaping through the walls, immediately making your home warmer and cutting energy bills by up to £200+ per year.
Our professional installation takes just 3-4 hours with minimal disruption. We drill small holes in the outer wall, inject high-quality insulation material, then seal everything perfectly. Most homes built between 1930-1990 are suitable for cavity wall insulation.
Why might you need cavity wall insulation?
If your home has cavity walls and no insulation, it could be leaking a third of its heat.
Cold rooms and bedrooms that never seem to warm up properly
High energy bills every winter despite having the heating on constantly
Your EPC certificate shows 'Cavity Wall – uninsulated' reducing your rating
No signs of previous insulation drilling around your property's exterior walls
Interior walls feel cold to the touch, especially on external-facing walls
The benefits of cavity wall insulation
Cavity wall insulation is one of the most cost-effective home improvements you can make. Transform your Yorkshire home's comfort and energy efficiency in just one day.
Stop 35% of heat loss through external walls permanently
Cut heating bills by £200-400 per year with immediate effect
Permanently improves your EPC rating and day-to-day comfort
Professional installation completed in just 3-4 hours with minimal disruption
25-year CIGA warranty provides complete peace of mind
Free Home Survey
We inspect your walls, check for previous installs, and confirm the right specification for your property.
Drilling & Injection
We drill small holes in the mortar joints and inject insulation into the cavity space.
Repoint & Clean Finish
Drill holes are refilled and cleaned to blend seamlessly with your brickwork.
Areas we cover
Our teams work across these areas from our head office in Beverley.
- Hull
- BeverleyHead office
- East Riding of Yorkshire
- Leeds
- Sheffield
- Doncaster
Over 89 5-star reviews from satisfied clients across the UK - and growing every month.
Fully accredited retrofit installer. Our work meets PAS2030 and TrustMark standards.
Every installation is covered by a third-party insurance-backed guarantee, giving you complete peace of mind.
We'll check your eligibility and provide expert guidance, with no hard sales and no hidden costs.
Excellent on Google
4.6out of 5 based on 89 reviews
- July 2026
The lad that came to do my bathroom have done an amazing job their customer service was spot on 10/10 so polite so professional and easy to talk I am over the moon with the bathroom well done for all your hard work to the both of you
- June 2026
Northern Retrofit put in high-quality cavity wall insulation for me as a private customer. Their survey was very thorough and the quote was very competitive. The install went perfectly, even though there was some tricky areas on my house, and the team answered all my questions.
- May 2026
Very speedy and professional service. Would highly recommend
- March 2026
Very happy with the quick service to get a new EPC for my property.
- February 2026
Excellent Team with professional services
- January 2026
Arrived promptly, great communication, inspection carried out of friday, EPC certificate issued on monday, no complaints
- January 2026
Brilliant service
- January 2026
EPC done with no problems
How do I know if I have cavity walls?
Most homes built after 1930 do. We can confirm with a free borescope survey.
How long does it take to install?
Usually less than a day.
Is it messy or disruptive?
Not at all. We tidy up fully and leave your walls looking untouched.
Do you work for councils, housing associations and contractors?
Yes. We deliver cavity wall insulation for councils, housing associations and main contractors, from single properties to larger programmes.
Can every cavity wall be insulated?
No. Some walls aren't suitable, for example where exposure to driving rain is high or the cavity is narrow or blocked. We check suitability with a survey before recommending anything.
What areas do you cover?
We cover Hull, Beverley and the East Riding of Yorkshire, along the M62 corridor to Leeds, and south to Sheffield and Doncaster.
Prefer to Call?
Mon-Fri 8am-6pm, Sat 9am-4pm
We respond within 2 hours
Based in Yorkshire, serving all of the UK
Hull, Leeds, Sheffield, York & the whole of the UK
What Happens Next?
We'll call you within 24 hours to confirm your appointment
Free 30-minute home assessment at your convenience
Instant quote and booking for installation
