An EWS1 — External Wall System form — isn't itself expensive. It's a single sheet, and once the assessor has done the work behind it, issuing the form and handing over a copy costs nothing. What costs money, and what people usually mean when they ask "how much does an EWS1 cost," is the fire-risk appraisal that has to happen first: a qualified professional examining the building's external wall construction, cladding, insulation and attachments, and reaching a documented conclusion about fire risk. In 2026 that typically runs £6,000–£20,000 per building for a fairly ordinary block, and can pass £28,000 or more for a larger building, a complex façade, or one that needs an intrusive investigation — physically opening up sample areas of wall to see what's actually inside it.
It's priced per building, not per flat, which matters because almost nobody pays it directly. A freeholder, right-to-manage company or managing agent commissions the assessment, and the cost is nearly always recovered from every leaseholder in the block through the service charge, whatever the size of their own flat. Split £12,000 across a 40-flat block and each lease is looking at roughly £300 before VAT; split the same figure across a smaller 12-flat conversion and it's closer to £1,000 each.
I'm a building surveyor, not a fire engineer or an EWS1-trained assessor — that's a distinct qualification I don't hold, and I don't do this work myself. But I survey a fair number of flats, and this question comes up often enough from buyers and leaseholders that it's worth setting out properly, including the part most guides skip: an EWS1 isn't a legal requirement at all. No statute says a building must have one. It was created by RICS and UK Finance in December 2019, in the aftermath of Grenfell, purely as a standardised way for lenders to decide whether they're comfortable lending against a flat in a building with cladding. Figures below were checked on 14 September 2026 against several fire-safety consultancies' published 2026 pricing, HomeOwners Alliance and Survey Merchant's guidance, cross-referenced against each other, plus RICS's own published guidance on scope.
The short answer
What you'll actually pay depends far more on the building's height and cladding than on the size of your own flat within it.
| Building profile | Typical cost (2026) | What's involved |
|---|---|---|
| Under 11m, no known combustible panels | £0 | Generally out of scope under current RICS guidance — an EWS1 shouldn't normally be needed |
| 11–18m, with cladding/balcony risk factors | £6,000–£12,000 | Desktop-led PAS 9980 review; usually aiming for an Option A conclusion |
| Over 18m, or known combustible cladding at any height | £12,000–£28,000+ | Intrusive investigation opening up sample wall areas, often needing a fire engineer's sign-off |
| Copy of an existing, valid EWS1 | £0 | If the building's already been assessed within the last five years, a copy should cost nothing |
What drives the price
Desktop review versus intrusive investigation. A documentary review of drawings and photographs is the cheaper end of this range. Physically opening up wall sections to check what insulation and cavity barriers are actually behind the façade — often the only way to reach a defensible conclusion — costs considerably more, and is increasingly what a careful assessor insists on rather than guessing from the outside.
Who has to sign it off. A RICS-trained chartered building surveyor can sign an Option A conclusion (materials unlikely to support combustion) on lower-risk buildings. Where combustible materials are confirmed and the outcome turns on a genuine fire-engineering judgement — an Option B1 or B2 conclusion — only a Chartered or Incorporated fire engineer can sign it, and that expertise costs more.
Access. Scaffolding, a cherry picker or rope access to reach and sample a tall or complex façade adds real cost on top of the assessment fee itself, and taller buildings usually need more of it.
How many different wall types the building has. A block with one consistent cladding system is simpler and cheaper to assess than one mixing render, brick slip panels, timber cladding and balconies, each of which may need its own sample and its own conclusion.
Region. As with the rest of this series, London and the South East trend above the national figures quoted here, partly because genuinely EWS1-trained assessors and fire engineers are in shorter supply relative to demand than in most trades.
Do you actually need one?
Less often than the scale of the cladding crisis suggests, and the rules have moved a lot since 2019. The form was introduced for buildings over 18 metres (roughly seven storeys or more). A government advice note in January 2020 then, controversially, extended the same caution to buildings of any height, which is largely why demand for EWS1s spread so far beyond the original tall-building scope and mortgage valuations on ordinary low-rise blocks started stalling. From 2021 onwards, government and then RICS pulled back from a blanket height rule in favour of a proportionate, risk-based approach set out in the technical standard PAS 9980:2022, which looks at cladding type, balconies and escape design rather than storey count alone.
The practical position in 2026: buildings under 11 metres are generally treated as out of scope unless they carry a known combustible panel system — ACM, MCM or HPL — in which case height stops being the deciding factor. Buildings between 11 and 18 metres depend on the specific cladding and balcony risk present; remediation for genuine problems in this band can draw on the government's Cladding Safety Scheme, run by Homes England. Buildings over 18 metres, where identified as needing remediation, fall to the separate Building Safety Fund. None of that funding covers the EWS1 assessment fee itself, only the remediation work that might follow it.
Lender policy varies more than most leaseholders expect, too. UK Finance's major lenders pledged in April 2025 not to demand a wholesale re-check of EWS1 forms more than five years old, and some lenders had already stopped asking for one at all on certain lower and mid-rise blocks. RICS itself published a second edition of its valuation guidance in May 2026, effective from 1 November 2026, setting out further proportionate criteria specifically for blocks of flats of four storeys or fewer — a continued narrowing, not a widening, of when one's genuinely needed. If a lender or a managing agent is telling you an assessment is required, it's worth asking exactly which risk factor is driving that, rather than assuming from the building's height or storey count.
Who pays — and the gap the Building Safety Act doesn't cover
The Building Safety Act 2022 gives real protection to "qualifying leaseholders" — broadly, someone whose lease was long (21+ years), on which they paid a service charge, in a building of at least 11 metres or five storeys, as at 14 February 2022, and which was either their only or principal home or one of no more than three UK properties they owned. For those leases, the Act stops the cost of cladding remediation works being passed on through the service charge at all.
What that protection doesn't reach is the diagnosis itself. The EWS1 assessment fee, any waking watch put in place while a building's status is unresolved, and increased buildings insurance are generally not covered by the remediation protection, nor by the Building Safety Fund or Cladding Safety Scheme, both of which fund the works identified as necessary rather than the appraisal that decides whether any are. It's a distinction worth understanding before assuming the Act shields you from every cladding-related bill: it protects you from paying to fix a problem you didn't cause, not from paying to find out whether one exists.
What I'd watch for in a quote
- Desktop or intrusive, stated plainly. An Option A "no problem here" conclusion reached without ever opening up the wall is worth questioning on any building where the cladding type isn't already well documented.
- The assessor's qualification matched to the conclusion being reached. A RICS-trained building surveyor can properly sign an Option A outcome; only a Chartered or Incorporated fire engineer can give a valid Option B1 or B2 judgement where combustible materials are confirmed.
- Written confirmation of who's paying and when it'll appear on a service charge demand, so it isn't a surprise months later.
- Whether your lender's current policy genuinely still requires this before committing to a fresh assessment — not every lender has the same stance, and some have eased since 2025.
- The building's actual measured height against the 11m/18m thresholds, not an assumption based on the number of floors, since floor-to-floor heights vary between buildings.
Questions I get asked
How much does an EWS1 form cost in 2026? The form itself is free once the fire-risk appraisal behind it is done, and a copy of an existing valid one should also be free. The appraisal typically costs £6,000–£20,000 per building, rising past £28,000 for a larger or more complex block needing intrusive investigation. It's priced per building and usually recovered through the service charge, not billed to a single flat.
Does my building actually need an EWS1? Less often than in 2019–2020. Under 11m is generally out of scope unless there's known combustible cladding; 11–18m depends on the specific cladding and balcony risk; over 18m, or with confirmed combustible panels at any height, an assessment is far more likely. Height alone hasn't decided this since 2021.
Who pays — can the freeholder bill me directly? The freeholder or managing agent commissions and initially pays, then usually recovers the cost from every leaseholder through the service charge. The Building Safety Act's leaseholder protections stop qualifying leaseholders paying for cladding remediation works, but that doesn't extend to the assessment fee itself, waking watch, or extra insurance.
My lender wants an EWS1 but my managing agent says it isn't needed — what now? Get the managing agent's position in writing, citing the specific PAS 9980 risk factors, and take it to your broker before paying for a fresh assessment. UK Finance's major lenders agreed in 2025 not to demand wholesale re-checks of EWS1s over five years old, and policies vary enough between lenders that a different one, or a clear written case, can resolve it without a new appraisal.
If you're buying a flat and a lender or the paperwork has raised a cladding question, my HomeBuyer survey and building survey work both cover flats as well as houses — and while I can't issue an EWS1 myself, a proper look at the building's construction, cladding and balconies before you commit tells you whether that question is likely to come up at all, rather than finding out after an offer's been accepted. It sits alongside fire risk assessment cost, which covers the separate statutory duty for a block's common parts — not the same thing as an EWS1, and easily confused with it. Call 07946 618203 or get in touch before you commit to a flat purchase in a building with cladding.
Small print. This guide is general information, not advice on a specific building or lease, and it doesn’t replace a written assessment from a suitably qualified EWS1 assessor or advice from a solicitor on your specific leaseholder protections. Prices were researched and correct to the best of my knowledge on 14 September 2026; costs move and vary by region, building and assessor. Always get at least three written quotes, and confirm your lender's current policy before commissioning a fresh assessment.