Quotes for taking spray foam off a roof are built on a rate per square metre, yet the total seldom ends with the foam. Behind the insulation sit rafters and battens that nobody has seen since the day it was sprayed, and what they look like decides how much work follows. A clean strip on sound timber is one job. A strip that uncovers damp rafters, rusted nail tips or a perished underlay is another. Below you will find the figures that a published cost guide reports for the UK, a worked example for a small and a larger roof, and a list of what a sound quotation names. Those figures are national, which makes them a yardstick for judging an offer and not an offer in themselves. On a Bath house we price from the roof in front of us, after a survey with photographs of it. Our spray foam insulation service covers the whole process. If you are still weighing up whether to take the foam out at all, our guide on whether to remove spray foam covers that decision first.
What spray foam removal costs per square metre
The published ranges come from MyBuilder's spray foam removal cost guide (2026), which reports typical UK figures rather than prices from any one firm. They are summarised below.
| Item | Typical UK range |
|---|---|
| Removal of spray foam | £20 to £50 per m² |
| Average whole job | About £1,500 |
| Assessment before removal | £100 to £200 |
| Disposal of the waste | £150 to £400 |
The spread inside the per-metre figure is wide because foam is not one product. It is sprayed on wet, it expands, and it bonds to whatever it lands on. In one loft it may sit in a thin, even layer that lifts cleanly. In another it may be piled deep between rafters, over wiring and around the tail of every slate. Removal time follows the foam, and the labour follows the time.
Treat the average of about £1,500 with care. It describes a typical job, and typical here means a modest area with no complications. Your own roof may sit well below or well above it, and the survey is what tells us which. Once the survey is done, the quote we fix lists every item separately instead of folding them into a single line.
Why the price moves: foam type, depth and bond
Four factors explain why one roof lands near the bottom of the range and another near the top.
Open-cell or closed-cell
The two types come off in different ways. Open-cell foam is softer and can often be cut and pulled away in pieces. Closed-cell foam is dense and rigid, and it is usually taken off in stages with scrapers and hand tools, which takes longer. Our guide to open-cell and closed-cell foam explains the difference, and each method is walked through in the step-by-step removal guide.
Thickness and how it was applied
A thin coat against the underside of the tiles is quicker than a deep fill between the rafters. Where the foam has been sprayed hard against the back of slates or tiles, every slate has to be freed without cracking it, and that is slow, careful work.
Adhesion to the timber
Foam sticks hardest to rough, dry softwood. Old rafters that have never been planed give it plenty to grip, and removal then leaves a residue that needs further work to bring the timber back to a state a surveyor can inspect.
Access and loft height
A tall, open loft is easy to work in. A low pitched roof with a narrow eaves zone is not, because the person doing the work may be on their knees for most of the day. Access affects the labour, the dust control and the speed at which waste can be carried out.
Added together, these four factors explain why a cost guide can only give a spread. They also explain why we would rather see the loft than quote over the phone: a photograph of the foam from the hatch tells us the type and the rough depth, but not how firmly it has stuck to the timber beneath.
What you find behind the foam
The part of the job nobody can price from a distance is the timber behind the foam. Spray foam hides rafters, battens, the underlay and the reverse of every slate or tile, and it does so completely. The first time anyone sees those parts is when the foam comes off.
Often the timber is sound and needs only cleaning. Sometimes it shows staining, softness or signs of old moisture, and that changes the plan. A rafter with a damp or decayed section may need a new piece fixed alongside it. A batten that has rotted at a nail may need replacing. Slate nails that have rusted through can leave slates held by very little, and an older roof may need fresh fixings where we expose them.
None of this is a given. Plenty of roofs come out of the foam in good order. But a quote that assumes the best and says nothing about the worst leaves you exposed to a price change halfway through, which is why we describe in writing what the survey could and could not see. For the inspection itself, read spray foam and roof timbers, which covers what we look for and what repairing those timbers involves.
Costs that sit outside the removal rate
A per square metre rate for removal covers the work of taking the foam off. Other items are normally separate, and a clear quote shows each of them on its own line.
The first is the assessment. In MyBuilder's guide it appears at £100 to £200 as a typical UK range, and it is the look at the foam, the loft and the timbers before any price is agreed. Disposal is the second, reported at £150 to £400. Waste from foam is bulky and light, which fills skips quickly, and the waste leaves with us, with the loft and the site left clear at the end.
The third is the work that follows removal. Once the foam is out, the roof has no insulation, so most households want it re-insulated, usually with a form that lets the roof structure breathe and dry. That has its own materials and labour, and the cost depends on the loft area, the insulation chosen and whether the roof also needs a ventilated gap or a new membrane under the covering. The detail sits in our page about insulation after spray foam. Re-insulating can touch Building Regulations, because a roof is a thermal element. Our guide to spray foam and Building Regulations explains when approval applies, and we handle the paperwork where the work is notifiable.
Finally, there are timber repairs, covered above. Because they depend on what is found, a sensible arrangement is a provisional sum agreed in advance, with a photographed record of anything that triggers it. You then see the problem before you pay for the fix, and the sum is spent only if the timber needs it.
Working a total out for your own roof
Here is how the typical ranges combine. The roof sizes below are examples only, picked to show the arithmetic, and they are not a quote for any house.
Take a roof where 40 m² of foam is to come off. At £20 to £50 per m², the removal itself comes to £800 to £2,000. Add the assessment at £100 to £200 and disposal at £150 to £400, and the whole sits between £1,050 and £2,600. Now take a larger roof of 60 m². The removal alone comes to between £1,200 and £3,000, and with the same assessment and disposal added, the total is £1,450 to £3,600.
Neither figure includes timber repairs, scaffold if the covering needs work from outside, re-insulation or any ventilation changes. Those are the items that make two quotes for the same house differ, so ask each firm to list them separately. If one quote includes re-insulation and another stops at the stripped loft, the cheaper one may be the more expensive in the end.
Finally, remember what the ranges are. They are typical UK figures reported by a third-party guide in 2026. They do not describe a Bath price, and they do not describe ours. What binds us is the written fixed price that follows a visit to your loft and a good look at the foam.
Survey, quote and what to check on a Bath house
A removal survey starts in the loft and moves to the roof. We look at the foam type and depth, check the rafters and battens where they can be seen, photograph the underside of the covering and note any signs of past leaks. You receive pictures of the roof you own, a written fixed price and a clear description of the work, including what we will do if the timber turns out to be worse than it looks. The workmanship carries a written 10-year guarantee.
On a Bath house there are a few extra questions. B&NES Council should hear about any change to the roof structure of a listed house before work starts, since the consent for listed buildings is applied for separately from planning permission. Bath is a World Heritage Site throughout, and the conservation area covers about half the city, so a house may sit inside one boundary and outside the other. Where the street can see the roof, ask the council early how repairs that match the original are treated, and keep the reply with your paperwork. A written answer from the council is worth having if you sell later and a buyer's solicitor asks what was done to the roof.
If the reason for removal is a mortgage or a sale, read our guide to spray foam and mortgages first, because the evidence a lender asks for may shape what you need done. If you are not sure that removal is the right answer, our guide to alternatives to removing spray foam sets out other routes, and our piece on whether spray foam is bad explains why the foam itself is not always the problem.