Mortgage lender refuses to lend
We remove the foam, document the wall condition and issue a certificate your lender and surveyor accept. Most London customers are back in the buying process within a week of the removal finishing.
We clear foam, restore walls and get your survey back on track
Cavity wall spray foam removal in London done right
Cavity wall spray foam removal in London is our core trade, and we handle it for homeowners, landlords and buyers across Greater London. If foam was pumped into your walls years ago and now a lender, surveyor or buyer has flagged it, we remove it cleanly, repair the wall ties and cavities, and leave you with a wall that can be surveyed and mortgaged. Same-day assessments across London.
Careful work. Honest options.
About this service
What Cavity wall spray foam removal in London involves
Cavity wall spray foam removal in London means cutting out and extracting the injected polyurethane foam that sits between your inner and outer brickwork, then cleaning the cavity so it can be inspected, re-insulated or simply left clear. Foam was often installed under government schemes, but many lenders now refuse mortgages on properties with it because it hides damp, rot and failed wall ties. We remove it in controlled sections, bag every scrap and vacuum the cavity so nothing is left behind.
London homes are hit hardest by this problem. Thousands of terraces in Camden, Islington and Hackney had cavity wall insulation pumped in during the 2000s and 2010s, and now buyers are finding mortgage rejection due to spray foam, reduced property value and difficulty obtaining surveys. If you are searching for cavity wall insulation removal London wide, we cover every borough from Westminster to Croydon. We also handle cavity wall foam removal London Greater London jobs where the foam has started to slump or smell.
- ✓ Unblock your mortgage
- ✓ Stop hidden damp and rot
- ✓ Restore property value
- ✓ Clear the way for new insulation
What's included
What our cavity foam removal includes
Every cavity wall spray foam removal in London job is priced as a complete package, not a list of extras. You get the survey, the removal, the clean-up and the paperwork in one fixed price. If we find failed wall ties or hidden damp during the work, we tell you before we do anything chargeable.
✓
Full cavity survey
We inspect the walls with a thermal imaging camera, drill small test holes and map the foam spread. You get a written report with photographs and a fixed removal price, usually the same day you call.
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Foam extraction and disposal
We remove open cell and closed cell foam from the cavity using vacuum, saw and blasting equipment. All foam is bagged and disposed of through licensed waste routes, with the paperwork included.
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Wall tie and damp check
With the cavity open we inspect every wall tie, check for corrosion and look for hidden damp and rot. Failed ties are reported, and we can replace them as part of the same visit.
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Cavity clean and airflow restore
We vacuum the cavity, clear any debris and confirm the air path is open. That stops the damp problems that trapped foam causes and leaves the wall ready for a compliant insulation system if you want one.
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Making good and certificate
Access holes are re-pointed with matching mortar, vents are refitted and the site is swept clean. You receive a removal certificate, before-and-after photographs and a written summary for your lender or surveyor.
How it works
How our cavity foam removal process works
01
Survey and quote
We attend your London property, drill small inspection holes and use a thermal imaging camera to map exactly where the foam sits and how far it has spread. You get a fixed written price the same day, usually within two hours of the visit, with no obligation to proceed.
02
Set up and protect
On the first morning we sheet floors, seal doorways and set up a negative air machine with HEPA filters so dust and foam particles stay inside the work zone. Our technicians wear full respirators and protective clothing. Setup takes around 45 minutes on a typical London terrace.
03
Remove the foam
We open the outer leaf at intervals and extract the foam using a combination of reciprocating saw, oscillating multi-tool and industrial vacuum. Stubborn sections are broken down with dry ice blasting or sand blasting media. A standard three-bedroom London house takes two to three days.
04
Clean and inspect
Once the foam is out we vacuum the cavity, check every wall tie and look for hidden damp and rot. Any failed ties are replaced and the cavity is left clear for airflow. We photograph each section so you have a full record for your lender or surveyor.
05
Make good and hand over
We re-point the access holes with matching mortar, refit any vents and leave the site swept. You get a removal certificate, before-and-after photographs and a written summary of what we found. Most London jobs are signed off within 24 hours of the last day on site.
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 on every survey to map foam spread and find cold spots that indicate trapped moisture or missing insulation. It lets us see inside the wall before we cut into it.
Dry ice blasting machine
Fires dry ice pellets at the foam to freeze and crack it away from brickwork. Ideal for delicate or historic London walls where sand blasting would be too aggressive.
Industrial vacuum and air scrubber
Extracts loose foam and dust from the cavity while the air scrubber and negative air machine keep the work zone under negative pressure, so nothing escapes into your home.
Reciprocating saw and oscillating multi-tool
Cuts through dense closed cell foam and opens access points in the outer leaf. Bosch and Makita cordless tools let us work neatly in tight London side returns and alleys.
Respirator and protective clothing
Every technician wears a fitted respirator, coveralls and gloves. Spray foam chemical hazards are real, and we treat every removal as a contaminated site until it is cleaned.
HEPA filters and disposal bags
HEPA filters capture fine particles, and heavy-duty disposal bags hold the removed foam for licensed waste transfer. Nothing is left on site or fly-tipped.
Moisture meter and inspection camera
Checks wall tie condition and timber moisture once the cavity is open. It confirms whether hidden damp and rot have taken hold before we make good.
Real results
Before and after.
Westminster terrace, mortgage unblocked
Before
A two-bed Victorian terrace in Westminster had cavity foam installed in 2013. The buyer's lender refused to lend, the sale had already fallen through once and the owner was facing another lost chain.
After
We removed the foam from all four elevations in three days, replaced two corroded wall ties and issued the removal certificate with dated photographs. The lender released the mortgage offer nine days later and the sale completed.
Croydon semi, damp resolved
Before
A 1930s semi in Croydon had closed cell foam in the cavity and a recurring damp patch on the hallway wall. Two previous contractors had told the owner the foam could not be removed without rebuilding the wall.
After
We used reciprocating saws and dry ice blasting to extract the foam over four days. The cavity was vacuumed clean, three failed wall ties were replaced and the damp source was eliminated. The hallway dried out within three weeks.
Islington loft and cavity, sale completed
Before
An Islington homeowner had foam in both the loft and the cavity walls. The surveyor flagged loft condensation and roof ventilation issues, and the buyer's lender wanted both areas cleared before valuing the property.
After
We removed the loft foam and cavity foam in five days, restored the roof ventilation path and replaced the contaminated loft insulation. The property was re-surveyed and valued at asking price, and the sale completed on schedule.
Problems we solve
Problems our London cavity foam removal solves
Cavity foam causes a small number of very specific problems, and they nearly always surface at the worst possible moment, usually during a sale or remortgage.
Ask a pro →↗
Surveyor flags hidden damp and rot
We open the cavity, remove the foam and inspect every wall tie and timber. Any damp source is identified and treated, and we photograph the dry cavity so you have proof the problem is resolved.
Property value drops below comparable stock
Once the foam is out and the wall is clear, your property is valued like any other on the street. We provide the evidence pack that estate agents and lenders need to market and mortgage the home normally.
Loft condensation and roof ventilation issues
We remove the foam, restore the ventilation path and check the roof space for condensation damage. Where needed we clear blocked vents and leave the loft ready for compliant insulation.
Proof you can check
Accredited and insured
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CHAS accreditationCHAS (Contractors Health and Safety Assessment Scheme)
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Constructionline registrationConstructionline
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SafeContractor approvalSafeContractor
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PAS 2035 retrofit trainingBritish Board of Agrément recognised training providers
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Public liability insuranceUK commercial insurer
Typical 2026 pricing in London runs from £1,800 to £4,500 for a standard house, depending on wall area and foam type. A small two-bed terrace may come in near £1,800, while a large detached property with dense closed cell foam can exceed £4,500. The survey and fixed quote are free, so you know the exact figure before we start.
Yes. We remove injected cavity foam from brick, block and rendered walls across every London borough. We open the outer leaf at intervals, extract the foam with vacuum and blasting equipment, then re-point the access holes with matching mortar. Most London cavity wall foam removal jobs are completed in two to four days.
It is necessary if you need a mortgage, a survey or a sale to proceed. Most high-street lenders refuse to lend on properties with injected cavity foam because it can hide damp, rot and failed wall ties. If you are staying put and have no damp or structural issues, removal is optional, but the foam will keep causing problems over time.
A typical London house takes two to four working days from setup to handover. Small terraces can be finished in two days, while larger semis and detached homes with thick foam may run to four or five. We give you a firm schedule at the survey and keep you updated each day.
More services
Related Services
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Book Cavity wall spray foam removal in London today
Call 02080885342 and we will book a free survey, usually the same day. We are insured, we work to PAS 2035 and Building Regulations Part L, and we leave every London property clean and documented. One call gets your walls clear and your sale moving.
Get a free quote 02080885342 →
Request an appointment
Book your spray foam removal
Call 02080885342 between 8am and 6pm Monday to Friday, or leave a message any time and we will call you back the next morning. Most surveys are booked within 48 hours and quotes go out the same day. Email works too if you have photos of the loft to send over.
Call anytime02080885342Email the officeinfo@sprayfoamremovallondon.store
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