What is cavity wall extraction?
Cavity wall extraction is the process of removing old or faulty insulation material from between the external and internal walls of your home. Over time, certain types of insulation can absorb moisture, slump, or degrade — causing damp, mould, cold spots, and skyrocketing energy bills.
At Northern Retrofit, we safely extract failed insulation and prepare your walls for fresh, high-performance cavity wall insulation — so your home stays warm, dry, and energy-efficient for years to come.
Why you might need cavity wall extraction
If your home had insulation installed more than 20 years ago — or if it was poorly installed — there’s a chance it may be doing more harm than good.
Signs you may need cavity wall extraction include:
Cold spots on interior walls that weren't there before insulation
Persistent damp or mould appearing after insulation was installed
Wet or slumped insulation discovered during property surveys or renovations
Previous insulation installed in unsuitable properties with exposed walls or solid construction
High heating bills despite having cavity wall insulation installed
The benefits of cavity wall extraction & reinstallation
Removing failed insulation and installing modern, high-quality materials transforms problem properties into comfortable, energy-efficient homes.
Eliminate damp and mould problems at the source permanently
Transform your home's energy efficiency with modern insulation materials
Cut monthly energy bills by £200-400 with proper insulation performance
Increase property value and EPC rating with compliant, warrantied installation
Enjoy a warm, dry, comfortable home year-round without cold spots
Survey & Inspection
Our qualified team inspects your walls using borescope cameras and thermal imaging to assess the insulation’s condition.
Safe Extraction
We remove insulation by blowing high pressure air into drill holes in the mortar joints — with minimal disruption to your property.
Make Good & Prepare
Once extraction is complete, we refill the holes, make good any surfaces, and prep your walls for new insulation — often installed the same day.
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
Is extraction messy?
Not at all. We use specialist vacuum systems and repair any holes we drill.
Do I need new insulation afterwards?
Yes. Removing faulty cavity wall insulation is only the first step. Once the cavity is clear, we'll recommend the right replacement insulation for your property.
How long does it take?
Most cavity wall extractions are completed in a day, depending on property size and condition.
Do you work for councils, housing associations and contractors?
Yes. We deliver cavity wall extraction for councils, housing associations and main contractors, from single properties to larger programmes.
How do I know if my cavity wall insulation has failed?
Common signs are damp or mould on internal walls, cold spots that appeared after the insulation went in, and heating bills that never came down. We confirm it with a borescope inspection before any work starts.
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
