How much does attic spray foam removal cost in London
Attic spray foam removal in London costs £1,800-£6,500 in 2026. Here are the real per-square-metre rates, what pushes a quote up, and how long the job takes.
Attic spray foam removal in London costs between £1,800 and £6,500 for most homes in 2026, with the average job landing around £3,200. The final figure comes down to three things: how many square metres of foam are up there, which type of foam was sprayed, and how hard it is to reach the loft.
Attic spray foam removal is the process of cutting, scraping or blasting cured spray foam out of a loft space so the roof can breathe again and a mortgage lender will lend against the property. Below we break down real London pricing, what pushes a quote up or down, and how long you should expect your house to be a building site.
What attic spray foam removal costs in London in 2026
Attic spray foam removal in London is priced per square metre of foam, not per hour, and 2026 rates sit between £28 and £55 per square metre depending on access and foam type. A typical 60 m² London loft with open cell foam comes in at £1,800-£2,600. The same loft with closed cell foam is £3,000-£4,500.
Here is how the numbers shake out across the sizes we see most weeks:
- Small loft, 30-40 m² (Victorian terrace, open cell): £1,200-£2,000
- Medium loft, 50-70 m² (1930s semi, mixed foam): £2,200-£3,800
- Large loft, 80-120 m² (detached or converted): £3,800-£6,500
- Rafters plus ceiling joists (foam sprayed both ways): add 25-40%
Those figures include labour, sheeting, extraction, waste disposal and a post-removal clean. They do not include re-insulating the loft afterwards, which usually adds £900-£2,000 for mineral wool or a breathable board system.
What affects the cost of attic spray foam removal in London?
Five variables move a London attic spray foam removal quote more than anything else, and every one of them is visible on a first visit.
Foam type: open cell versus closed cell
Open cell foam is soft, spongy and comes out in handfuls. Closed cell foam cures hard like expanding glue and has to be cut or blasted off in chunks. Closed cell takes roughly twice as long, which is why closed cell spray foam removal London jobs cost 40-60% more than open cell on the same footprint.
Access and roof pitch
A loft hatch you can climb through with a mask on is easy. A 1930s semi in Spray foam removal in Wandsworth with a 1.2 m hatch, a low pitch and foam pushed into the eaves takes longer, and time is what you are paying for. Tight eaves and dormer cheeks add £300-£700 on their own.
Contamination and hidden damage
Foam that has trapped moisture against the felt often leaves rotten battens or damp rafters behind. We have to expose that, treat it, and let it dry before anyone re-insulates. Structural repairs are quoted separately and can run £500-£2,500.
Method: scraping, dry ice or sand blasting
Hand scraping is cheapest but slowest. dry ice blasting spray foam removal London is faster and leaves a cleaner timber surface, but the kit and the dry ice cost more to run. On hard closed cell foam the speed usually pays for itself.
Waste and disposal
Cured spray foam is bulky and cannot go in a standard skip. We bag it, sheet the loft and cart it to a licensed transfer station. Disposal is baked into our per-square-metre rate - expect £150-£400 of it on a mid-size job.
How much does attic spray foam removal cost in London?
For a standard London loft of 50-70 m², you should budget £2,200-£3,800 in 2026, with the median job at £3,200. Anything under £1,500 for a full loft usually means someone is scraping the surface and leaving the rest behind - which will not satisfy a lender.
We quote from a site visit, not from a photo. Foam depth, coverage and the state of the timbers underneath are impossible to judge from a phone picture, and guessing is how homeowners end up with a second bill halfway through.
How long does attic spray foam removal take in London?
A typical 60 m² London loft takes two to three working days to clear, with larger or closed cell jobs running four to five days. Open cell foam on a small terrace can be done in a single day.
The schedule usually looks like this:
- Day 1 - sheeting, extraction of loose foam, cutting back the bulk
- Day 2 - detail work around rafters, purlins and eaves; bagging waste
- Day 3 - clean-down, timber inspection, moisture readings
If we find rot or the roof needs attention, that adds time. We tell you the same day we find it, not at the end of the job.
Is attic spray foam removal worth it in London?
Yes, if a lender has flagged it, if the roof is sweating, or if you are selling in the next two years. The cost of removal is almost always less than the value knocked off a London property that cannot get a standard mortgage.
Spray foam sprayed directly onto the underside of roof felt traps heat and moisture against the timber. Over a few winters that shows up as damp patches, musty smells in the back bedroom, and in bad cases soft rafters. Lenders know this, which is why surveyors flag it and valuers down-value the property until it is gone.
Removing the foam does not automatically mean a colder loft. Once the timbers are dry and clean, we can fit a breathable insulation system that keeps the roof ventilated and the U-value where it needs to be. That is the part most homeowners actually want.
If you are working through a lender's conditions, our mortgage lender spray foam removal London service is built around producing the paperwork and photographic evidence a surveyor will accept.
What to watch out for before you book
The spray foam removal market in London has filled up with one-van operators who quote low and disappear mid-job. Here is what we see go wrong.
- Quotes given over the phone. Nobody can price foam removal without seeing the loft. If a firm gives you a firm number from a photo, it is a guess.
- Surface scraping only. If foam is left in the rafter bays, the surveyor will still flag it and you have paid for nothing.
- No waste paperwork. Ask where the foam is going. Licensed disposal comes with a waste transfer note.
- No post-removal moisture readings. You want to know the timbers are drying, not just that the foam is gone.
- Pressure to re-insulate on the same visit. The roof needs to dry first. Anyone spraying new insulation onto damp timber the next morning is creating the same problem again.
One more thing: check the firm carries proper insurance for working at height and inside a roof void. It is a small ask, and it matters if a tile goes through a ceiling.
When to call a professional
Call us when a surveyor has flagged spray foam, when your loft smells damp, or when you can see daylight through the felt and the foam is holding water against it. Those are the three situations where waiting costs more than fixing.
At Serenity Spray Foam Installers we handle the whole job - survey, removal, timber inspection, waste disposal and a written report you can hand to your lender. We work across Spray foam removal in Camden, Islington, Hackney and the rest of Greater London, and we can usually get a survey booked within a few days.
If you are not sure whether the foam in your loft is a problem, start with a proper look rather than a guess. Our insulation assessment London service tells you exactly what is up there, what condition the timbers are in, and what removal would realistically cost.
Frequently Asked Questions
How much does attic spray foam removal cost in London?
Most London lofts cost £1,800-£6,500 in 2026, with a 60 m² job averaging around £3,200. Open cell foam sits at the lower end, closed cell at the upper end. Access, roof pitch and any hidden timber damage push the figure up.
What affects the cost of attic spray foam removal in London?
Foam type, total square metres, loft access, roof pitch and whether the timbers underneath are damp or rotten. Closed cell foam costs 40-60% more than open cell. Tight eaves, dormers and waste disposal each add a few hundred pounds.
Is attic spray foam removal worth it in London?
Yes when a lender has flagged it or the roof is trapping moisture. Removal typically costs less than the value a London property loses when it cannot get a standard mortgage. It also stops further rot in the rafters and felt.
How long does attic spray foam removal take in London?
A typical 60 m² loft takes two to three working days. Small open cell jobs can be done in a day. Large or closed cell lofts run four to five days, plus extra time if we uncover rot that needs treating.
Can I remove spray foam from my attic myself?
No. Cured foam has to be cut or blasted out, the dust is a respiratory irritant, and the waste cannot go in a normal skip. DIY removal also leaves no paperwork, so a lender will still flag the loft when you come to sell.
Get help with Spray foam removal in London
If you want a straight answer on what your loft will cost to clear, book a survey with Serenity Spray Foam Installers and we will tell you the number on the day. We cover the whole of Greater London and we leave the loft clean, dry and ready for new insulation.
Call us on 020 8088 5342 to book your attic spray foam removal survey.