Fast, clean extraction for mortgage approvals and damp-free walls
Cavity Wall Spray Foam Removal in London
Cavity Wall Spray Foam Removal in London is the specialist process of stripping failed or non-compliant spray foam from wall cavities so your property passes lender surveys and stops trapping moisture. We handle cavity wall foam extraction London Greater-wide, from Victorian terraces in Camden to new-builds in Croydon. If a surveyor has flagged your insulation, call us today on 02080885347.
Live phone supportUpfront optionsBacked workmanship
What's included
What Our Cavity Wall Spray Foam Removal Includes
Every cavity wall spray foam removal in London we carry out includes the following as standard. There are no hidden extras for the things that matter, such as waste disposal and your completion report.
Full Thermal Imaging Survey
Before we quote, we survey your property with a thermal imaging camera and moisture meter. You get a written report showing exactly where foam is present and what condition the cavity is in. This is included at no extra cost.
Complete Foam Extraction
We remove all accessible foam from the cavity using cutting tools, vacuums and, where needed, dry ice blasting or sand blasting. We do not leave residue behind. Every cavity is checked visually and with a moisture meter before we close up.
Making Good and Reinstatement
We replace bricks, re-point mortar, and install new insulation batts or a vapour barrier where required. The finish matches the surrounding wall. You do not need to hire a separate builder to make good after us.
Waste Disposal and Transfer Note
All removed foam is taken away by a licensed waste carrier and disposed of responsibly. You receive a waste transfer note as proof. This is often requested by lenders and is included in your completion pack.
Lender-Ready Completion Report
After the job we provide a full report with before-and-after thermal images, moisture readings, photographs of every elevation, and a method statement referencing BBA guidance. This is the document your surveyor or lender needs to see.
Service overview
Cavity Wall Spray Foam Removal in London Explained
Cavity Wall Spray Foam Removal in London is the controlled extraction of polyurethane foam that was injected into external wall cavities, usually years ago under a now-disputed insulation scheme. The foam sets hard, bridges the cavity, and blocks the airflow your brickwork needs to dry out. We cut it out using oscillating multi-tools and reciprocating saws, pull it free with industrial vacuums, then verify every cavity with a thermal imaging camera before we sign the job off.
London homeowners call us for one reason above all: mortgage refusal due to spray foam. Lenders flag it, surveyors down-value it, and the sale stalls. We also see loft condensation and roof rot from trapped moisture in period properties across Islington and Hackney, where solid-brick walls cannot shed water once the cavity is sealed. If you need cavity insulation removal London-wide, our team works seven days a week and can usually assess your property within 48 hours.
How we workWe verify the cause, compare realistic options, and confirm the repair before we leave.
The service timeline
Our Cavity Wall Foam Extraction Process
The process flexes to the condition, but these checkpoints keep decisions clear.
Survey and Quote
We attend within 48 hours, drill small inspection holes at high and low level, and run a thermal imaging camera across the elevations to map exactly where foam sits. You receive a fixed written quote the same day, including any making good and redecoration.
Site Protection
Before any cutting starts we sheet up floors, seal doorways with zip barriers, and set up a dust extraction unit connected to the work area. Neighbours are notified if we are working on a shared wall. This stage takes one to two hours on a typical London terrace.
Foam Extraction
Using oscillating multi-tools and reciprocating saws we cut the foam into manageable sections, then pull it out with an industrial vacuum. Stubborn residue is removed with a dry ice blasting machine or, on hard-set closed cell spray foam, sand blasting equipment. A three-bed semi usually takes two to three days.
Cavity Clean and Inspection
We clear every cavity, check for damaged wall ties, and confirm airflow with a moisture meter and thermal imaging camera. Any timber treatments or wall-tie replacements are carried out now. You get photographs of every elevation before we close up.
Reinstatement and Report
We replace bricks, re-point, and install new insulation batts or a vapour barrier where building regulations require it. You receive a completion certificate with thermal images, moisture readings and a waste transfer note, which is the document lenders ask for.
Tools & methods
Tools and Methods We Use
Purpose-built equipment, used by trained technicians, so the job is done accurately the first time.
Thermal Imaging Camera
Used during the survey and again at completion to map foam location and confirm the cavity is clear. It shows temperature differences that reveal hidden moisture and missing insulation.
Moisture Meter
We take readings at multiple points before and after removal. This gives you hard numbers to show your lender, and it proves the wall is drying out correctly.
Oscillating Multi-Tool
The primary cutting tool for foam in tight cavities. It cuts cleanly without damaging bricks or wall ties, and it is precise enough for heritage properties.
Reciprocating Saw
Used for thicker sections of closed cell foam where the multi-tool would be too slow. We control the blade depth to avoid hitting embedded timbers or services.
Industrial Vacuum
Extracts loose foam fragments and dust as we cut. Connected to a dust extraction unit, it keeps the working area clean and protects your indoor air quality.
Dry Ice Blasting Machine
Removes adhesive residue and thin foam films from brickwork without chemicals or water. Ideal for delicate surfaces where sand blasting would be too aggressive.
Sand Blasting Equipment
Reserved for hard-set closed cell foam on masonry. We use it carefully to avoid damaging the brick face, and always follow with a full cavity clean.
Use cases
When You Need Cavity Wall Spray Foam Removal
These examples show how the service framework adapts rather than forcing every call through one repair.
Hackney Damp Flat Restoration
Two ground-floor flats in Hackney had black mould on the internal walls and a persistent musty smell. The landlord had spent thousands on damp-proof courses with no success. A moisture survey revealed cavity foam was trapping water against the wall. → We removed the foam from both flats, treated the mould with Envirograf products, and replaced two failed wall ties. Moisture readings dropped from 24% to 12% within six weeks. The tenants stayed in place throughout.
Bromley Detached House Sale
A four-bed detached house in Bromley had closed cell foam in the cavity and loft. The owners had been told by a general builder that removal would cost over £9,000 and take three weeks. They needed a second opinion before committing. → Our survey found the foam was accessible and less extensive than feared. We removed it in five days for £4,600, including making good and the completion certificate. The house sold within a month of our report being issued.
Problems we solve
Problems We Solve With Cavity Wall Foam Extraction
Cavity foam causes a predictable set of problems. Here are the ones we see most often in London, and how we fix them.
Mortgage refused because of spray foam
We remove the foam and provide a lender-ready report that satisfies surveyors and valuers. Most clients complete their sale within three to four weeks of our completion date. We can also speak directly to your lender's valuer if they have questions.
Damp and mould growth on internal walls
We extract the foam, clear the cavity, and restore airflow so the wall can dry out. We treat any mould with Envirograf products and can install new breathable insulation. Moisture readings typically drop below 14% within six weeks.
Roof rot from trapped moisture
Our roof spray foam removal team removes the foam, inspects the timbers, and treats any rot. We replace damaged sections and reinstate the roof covering. You get photographs of the timbers before and after treatment.
Overheating in summer and cold spots in winter
Removing the foam restores the wall's natural thermal behaviour. We then advise on the right insulation for your property, such as mineral wool batts or breathable boards, so you get comfort without trapping moisture.
Pricing process
Cavity Wall Spray Foam Removal Costs
£1,800 - £4,800 depending on property size and foam type
Property size and wall area
A two-bed flat has far less wall area than a four-bed detached house. We measure the actual elevations during the survey and price per square metre of cavity. This is the single biggest factor in the final cost.
Foam type and density
Open cell foam is softer and faster to remove. Closed cell foam sets hard and may require sand blasting or thermal methods. Closed cell removal can add 30-40% to the labour time, which is reflected in the price.
Access and scaffolding
If the cavity is accessible from ground level, no scaffolding is needed. Upper floors or restricted side returns may require a tower or scaffold, which adds to the cost. We include this in the quote if it is necessary.
How much does cavity wall spray foam removal cost in London?
Most London cavity wall spray foam removal jobs cost between £1,800 and £4,800 in 2026, depending on the size of the property and how much foam is present. A two-bed flat typically sits at the lower end; a four-bed detached house in Richmond or Barnet at the upper end. The price includes extraction, waste disposal, making good and your completion report.
Do you offer cavity wall foam extraction in London Greater?
Yes. We cover every London borough, from Croydon and Bromley in the south to Enfield and Barnet in the north, and out to Havering and Hillingdon. There is no travel surcharge inside the M25. We also work in the City of London and Canary Wharf, where we hold the required permits for commercial and residential blocks.
Is cavity wall spray foam removal covered by insurance in London?
Sometimes. If the foam was installed by a previous owner and is causing damp or structural damage, your buildings insurance may cover part of the removal cost. We provide a detailed report with thermal images and moisture readings that you can submit to your insurer. We do not handle claims ourselves, but we have worked with most major UK insurers.
How long does cavity wall spray foam removal take in London?
A typical London terrace or semi takes two to three days on site. Larger detached properties can take four to five days. The survey and quote happen within 48 hours of your call, and we can usually start work within one to two weeks. You will have your completion certificate the same day we finish.
Related services
Related Services
Spray Foam Removal near me
Our core spray foam removal service covers lofts, walls and roofs across London. If you are searching for spray foam removal near me, we are likely already working on your street. We assess, extract and certify, with the same fixed-price approach as our cavity wall work.
Same day Spray Foam Removal
For urgent cases, such as a collapsed property sale or an active damp problem, we offer same-day spray foam removal assessments in London. Call before 10am and we can often have a technician on site the same afternoon to survey and quote.
24/7 Spray Foam Removal
Our 24/7 spray foam removal line is for emergencies: water pouring through a foam-damaged wall, or a commercial premises that cannot close. We answer the phone around the clock and can mobilise a crew outside normal hours across Greater London.Ready when you are
Book Your Cavity Wall Spray Foam Removal in London
Get a fixed price and a survey within 48 hours. We are SafeContractor approved, fully insured, and we provide the lender-ready report you need. Call 02080885347 now or request a callback and we will tell you exactly what is involved.
Talk with the local team
Request Cavity Wall Spray Foam Removal
Call us on 020 8088 5347 or email [email protected] and we will book your free survey. We answer the phone from 8am to 6pm Monday to Friday, and our 24/7 line covers emergencies. Most London surveys happen within 48 hours of your call, and you get a fixed written price the same day.