Close-up view of cavity wall insulation material being injected into wall cavity during professional installation

Cavity Wall Insulation Hull

Professional cavity wall insulation for Yorkshire homes.

Many homes lose over a third of their heat through uninsulated walls. Our cavity wall insulation service seals that gap, reducing your bills and keeping your home warm.

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4.6

89+ Reviews

Close-up view of cavity wall insulation material being injected into wall cavity during professional installation

Cavity Wall Insulation Hull

Professional cavity wall insulation for Yorkshire homes.

Many homes lose over a third of their heat through uninsulated walls. Our cavity wall insulation service seals that gap, reducing your bills and keeping your home warm.

Google icon

4.6

89+ Reviews

25-year guarantee

Thousands of UK homes insulated

TrustMark accredited installer

25-year CIGA guarantee

25-year guarantee

Thousands of UK homes insulated

TrustMark accredited installer

25-year CIGA guarantee

25-year guarantee

Thousands of UK homes insulated

TrustMark accredited installer

25-year CIGA guarantee

25-year guarantee

Thousands of UK homes insulated

TrustMark accredited installer

25-year CIGA guarantee

Accredited by the UK's Most Trusted Retrofit Schemes

Accredited by the UK's Most Trusted Retrofit Schemes

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.

Close-up view of cavity wall insulation material being injected into wall cavity during professional installation
Close-up view of cavity wall insulation material being injected into wall cavity during professional installation

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

Our Simple 3-Step Process

Our Simple 3-Step Process

We keep the process simple and hassle-free:

We keep the process simple and hassle-free:

1

1

Home Survey

We inspect your walls, check for previous installs, and confirm the right specification for your property.

2

2

Drilling & Injection

We drill small holes in the mortar joints and inject insulation into the cavity space.

3

3

Repoint & Clean Finish

Drill holes are refilled and cleaned to blend seamlessly with your brickwork.

Trusted by Industry Leaders Across the UK

Serving homeowners, landlords, contractors, councils and housing associations

  • CLC Group Logo
  • Cocuun Logo
  • Hull City Council Logo
  • Energy Store logo
  • Hull City Council Logo

Trusted by Industry Leaders Across the UK

Serving homeowners, landlords, contractors, councils and housing associations

  • CLC Group Logo
  • Cocuun Logo
  • Hull City Council Logo
  • Energy Store logo
  • Hull City Council Logo

Trusted by Industry Leaders Across the UK

Serving homeowners, landlords, contractors, councils and housing associations

  • CLC Group Logo
  • Cocuun Logo
  • Hull City Council Logo
  • Energy Store logo
  • Hull City Council Logo

Trusted by Industry Leaders Across the UK

Serving homeowners, landlords, contractors, councils and housing associations

  • CLC Group Logo
  • Cocuun Logo
  • Hull City Council Logo
  • Energy Store logo
  • Hull City Council Logo

Why people trust Northern Retrofit

Why people trust Northern Retrofit

Rated 4.6 by homeowners, landlords and housing providers across the UK.

Rated 4.6 by homeowners, landlords and housing providers across the UK.

Reviewed & Trusted
Reviewed & Trusted

Rated 4.6 out of 5 on Google by our satisfied clients across the UK, and growing every month.

Certified & Compliant
Certified & Compliant

Fully accredited retrofit installer. Our work meets PAS2030 and TrustMark standards.

Insurance-backed Guarantee
Insurance-backed Guarantee

Every installation is covered by a third-party insurance-backed guarantee, giving you complete peace of mind.

Free, No-Obligation Assessment
Free, No-Obligation Assessment

We'll check your eligibility and provide expert guidance, with no hard sales and no hidden costs.

  • Cavity wall insulation
    After receiving a letter from Northern Retrofit informing me of the government scheme to improve insulation and that it was a free service, I was initially sceptic but decided to look into it further and, after a very pleasant phone conversation, I was assured it was ‘legit’ and went ahead with arranging cavity wall insulation which was carried out efficiently by a couple of very pleasant workers who made sure I had everything in place to keep my property sufficiently insulated also checking whether or not I needed ventilation/extractor fans which they were only too pleased to supply and fit at zero cost to me! Excellent service and I would not hesitate to recommend Northern Retrofit.
    Jim Tigernuts2025
  • EPC
    Very happy with the quick service to get a new EPC for my property.
    Chris Lambert-DowellMarch 2026
  • EPC
    Arrived promptly, great communication, inspection carried out of friday, EPC certificate issued on monday, no complaints
    Ellie ShreeveJanuary 2026
  • Room in roof insulation
    From initial contact to completion, the room-in-roof work done by Northern Retrofit on my house was completed to my total satisfaction. The workforce was efficient, friendly, and cooperative throughout the entire process. I would highly recommend this company to anyone considering similar work. One point to note is that, as with any plastering work, dust can get into the air, so it’s important to adequately cover furniture and belongings beforehand.
    Malcolm Broadbent2025
  • Cavity wall insulation
    Highly recommended this company to anyone. We had Cavity Wall insulation, window vents and an extractor fan installed. The process was seamless from the beginning through to the end. Work undertaken was to a high standard. Friendly, reliable and efficient staff who kept us fully informed at all times.
    sally townend2025
  • Loft & cavity wall
    Amazing service from Northern Retrofit, from enquiry to completion of loft and cavity wall insulation 7 days ! Great helpful staff and the installation engineers were courteous and efficient, well done to Northern Retrofit !!
    Tom Rush2025
  • Internal wall insulation
    Great company. Staff were fantastic. Very efficient. Work carried out was amazing. Don’t have many pictures but the finish was great. Would recommend without a doubt. We had internal insulation done
    Lisa Smith2025
  • Cavity wall insulation
    Free cavity wall insulation and extractor fan in bathroom fitted quickly and professionally. Small leakage of beads in the cellar which they came back and sorted the same day I rang. No complaints whatsoever, rare to get a worthwhile service for free! Thank you
    Bella GK.2025
  • Cavity wall extraction
    First class service from Northern Retrofit. We had our old cavity wall insulation taken out, and replaced with new. We were happy from start to finish, and found them to be both friendly and efficient. A special thanks must be given to Lucy in the office, and Kelby and Elliott who carried out the work. We are very happy with the result, it has made the house so much warmer. Thank you.
    Frances Sugden2025

Areas we cover

Our teams work across the north of England, the Midlands, the East of England and Wales.

  • North East
  • North West
  • Yorkshire and the Humber
  • East Midlands
  • West Midlands
  • East of England
  • Wales

Head offices in Beverley and Warrington

Not sure if we cover you? Ask about your area
We cover this regionOutside our usual areaHead office

Ready to Start Your Retrofit Project?

Ready to Start Your Retrofit Project?

Get expert guidance and a detailed quote from Yorkshire's most trusted retrofit specialists

Get expert guidance and a detailed quote from Yorkshire's most trusted retrofit specialists

Prefer to Call?

Mon-Fri 8am-6pm, Sat 9am-4pm

We respond within 2 hours

Head offices in Beverley and Warrington

Covering the North, the Midlands, the East of England and Wales

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

Frequently Asked Questions

Frequently Asked Questions

How do I know if I have cavity walls?

Most homes built after 1930 do. We confirm it with a borescope survey before any work starts.

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 the North East, North West, Yorkshire and the Humber, the East and West Midlands, the East of England and Wales, from our head offices in Beverley and Warrington.