How to Check Cladding Risk Before Making an Offer: 2026

TL;DR

Checking cladding risk before making an offer means confirming whether a flat’s building has external wall, balcony, or insulation problems that could affect your mortgage, insurance, service charges, or ability to resell. Ask the estate agent for building-level evidence (EWS1, FRAEW, Fire Risk Assessment, remediation status, and funding route) before you commit. An EWS1 is not a legal requirement and not a safety certificate, but missing paperwork can still block your lender. If the answers are vague, make your offer conditional or walk away.

What “Cladding Risk” Actually Means

Cladding risk is not just “does the building have cladding?” It covers the full external wall system: cladding panels, insulation, balconies, windows, doors, cavity barriers, fire-stopping, and hidden voids. According to GOV.UK’s FRAEW guidance, a Fire Risk Appraisal of External Walls examines all of these elements for fire spread risk.

When buyers talk about checking cladding risk before making an offer, they really mean four things:

1. Evidence risk. Is there clear documentation about the building’s external walls?
2. Mortgageability risk. Will your lender accept whatever evidence exists?
3. Cost and liability risk. If remediation is needed, who pays?
4. Resale and disruption risk. Even if you can buy, can you sell later without a loss?

You are checking the building, not just the flat. An EWS1 assessment covers the whole block and produces a single rating that applies to every unit inside it. You cannot commission a meaningful EWS1 just for one flat.

If you want cladding and EWS1 status checked alongside lease length, freeholder quality, service charges, and resale risk, BackStory produces a report for UK flats before exchange, delivered within 24 hours.

Why This Matters Before You Offer

Most buyers discover cladding problems too late. Practitioners on Reddit report that the typical pattern is: you make an offer, instruct a solicitor, pay for a valuation, and then the lender flags an issue with the external wall system or requests an EWS1 form that nobody can produce quickly. By that point you have spent money and weeks of time with no guarantee the deal will close.

This is not a rare edge case. As of August 2026, MHCLG was monitoring 4,724 residential buildings of 11m or more with unsafe cladding in England. Of those, 2,153 had not even started remediation. The government estimates between 5,900 and 7,400 residential buildings of 11m or above have or had unsafe cladding requiring work, representing 8% to 14% of that building stock. Estimated remediation costs run between £11.8 billion and £22.7 billion.

The message is straightforward. This is not a historic, post-Grenfell issue that has been resolved. It is a live market problem affecting thousands of buildings and tens of thousands of transactions right now.

The paperwork risk is separate from the fire-safety risk

Here is a distinction that trips up many buyers. A building can be perfectly safe but poorly documented, making it hard to mortgage. And a building can have a valid EWS1 form while still carrying wider fire-safety issues that the EWS1 does not cover.

Southwark Council states explicitly that not having an EWS1 does not mean a building is unsafe. But the absence of that form, or of equivalent evidence, can still derail your lending if the valuer or lender wants to see it.

EWS1, FRAEW, and Fire Risk Assessment: What’s the Difference?

These three terms get confused constantly. Here is what each one means and how buyers should use them.

Fire Risk Assessment (FRA). The building’s broader fire-safety assessment. Every block of flats should have one, and it should be kept up to date. It covers common areas, escape routes, fire doors, and, where relevant, external walls. Ask for the latest copy or at least a summary.

Fire Risk Appraisal of External Walls (FRAEW). A specialist assessment focused specifically on external wall fire risk. It examines cladding, insulation, balconies, cavity barriers, and fire-stopping using the PAS 9980:2026 methodology. GOV.UK says an EWS1 may use evidence from an FRAEW, but an EWS1 does not replace an FRAEW.

EWS1. A lender and valuer form that summarises external wall risk into a rating. RICS says a qualified professional conducts the fire-risk appraisal and then signs an EWS1 form that is valid for the whole building for five years. It is not a legal requirement. It is not a safety certificate. It exists primarily so that valuers and mortgage lenders can assess whether external wall remediation is likely to affect value.

A LinkedIn fire-safety practitioner recently drew the same distinction, noting market confusion where buildings request an EWS1 when a PAS 9980 appraisal would actually be more appropriate. The shift, according to that practitioner, is toward proportionality.

For a practical example of how cladding remediation status can determine whether to proceed on a flat, BackStory’s Acton W3 sample shows a modern two-bed where the entire decision hinged on who pays for live remediation works and whether the lender would accept the position.

When an EWS1 May Be Requested: The 2026 RICS Thresholds

RICS published the second edition of its secured-lending valuation standard in May 2026, effective from 1 November 2026. It gives valuers clearer criteria for when to request an EWS1 based on building height and cladding type.

The thresholds work roughly like this:

• Over six storeys. An EWS1 should be required where there is cladding, curtain wall glazing, or certain stacked combustible balcony conditions.
• Five or six storeys. An EWS1 should be required where there is a significant amount of cladding, or certain stacked combustible balcony conditions.
• Four storeys or fewer. An EWS1 should only be required where there is a significant amount of ACM, MCM, or HPL panels.

RICS defines “significant amount” as roughly one quarter of the entire facade, or roughly one quarter of one elevation where it links multiple floors or is concentrated around the main escape route. These details come from RICS’ 2026 valuation standard.

There is an important caveat. RICS says lender-specific guidance takes precedence over the professional standard. Your lender can still require an EWS1 even if the RICS criteria suggest one is not necessary, and vice versa. Always confirm with your broker before relying on these thresholds.

The 10-Minute Pre-Offer Cladding Check

Knowing how to check cladding risk before making an offer does not require a fire-engineering degree. It requires asking the right questions at the right time. Here are the ten checks to run before submitting an offer on any flat.

1. Count the storeys and estimate height

The 11-metre and five-storey thresholds matter for Building Safety Act protections and government remediation schemes. RICS also uses storey bands in its EWS1 valuation criteria. If you are viewing a flat above the fourth floor of a multi-storey block, cladding checks become more urgent, not less.

2. Look at the facade and balconies

Stand outside. Look for render panels, metal cladding, timber cladding, HPL-style panels, curtain wall glazing, or stacked timber balconies. RICS’ 2026 standard lists cladding types including ACM, brick slips, HPL, MCM, metal sheet panels, rendered external wall insulation, plastic, tiling systems, and timber.

3. Ask the estate agent for the EWS1

If one exists, request the complete form, including the rating, date, signatory name, qualifications, professional body, and organisation. RICS says the form should include all of this information. If pages are missing or the signatory details are absent, treat it as incomplete.

4. Ask for the Fire Risk Assessment and any FRAEW

GOV.UK says all blocks of flats should have an up-to-date Fire Risk Assessment. Where the external walls need specialist review, there should also be a supporting FRAEW. Ask for the latest versions of both, or at minimum a summary.

5. Check the EWS1 rating

If an EWS1 exists, understand what the rating means (covered in detail below). An A1 or B1 is generally easier to work with than a B2, but every rating still needs to be cross-checked against your specific lender’s appetite.

6. Ask about remediation status

Is remediation required, planned, underway, paused, or complete? A building with “funding agreed” may still create years of scaffolding, noise, access restrictions, and uncertainty. One Reddit user described a building where an EWS1 was issued in 2022, works started in 2025, paused, and were not expected to complete until 2028 or 2029. “Funded” does not mean “finished soon.”

7. Ask who is paying

Is the funding route developer-led, Cladding Safety Scheme, legacy Building Safety Fund, warranty, insurance, freeholder-funded, or unresolved? Since 1 September 2025, the Cladding Safety Scheme has been the single scheme for all 11m or above buildings in England. For under-11m buildings, the application window for new funding closed on 9 October 2026.

8. Check Building Safety Act protections

Confirm whether the seller’s lease qualifies for protections. This matters enormously for who bears remediation costs (covered in full below).

9. Ask your broker before applying for a mortgage

Show the broker whatever EWS1, FRAEW, or remediation documents you have gathered. Ask which lenders are viable. UK Finance confirms that mortgage lending remains subject to individual lender policy even where the industry statement applies.

10. Make your offer conditional

If there is any cladding uncertainty, the offer should be subject to satisfactory solicitor review of external wall documents, lender acceptance, remediation funding, leaseholder protection evidence, and insurance position.

What the EWS1 Ratings Mean for Buyers

The EWS1 form produces one of five ratings. Here is what each one means in practice.

A1. No combustible material in the external wall system, or the amount present is limited and unlikely to require remedial works. Generally the easiest rating for lending.

A2. Combustible materials present in attachments (like balconies) but assessed as not requiring remedial works.

A3. Combustible materials in attachments where remediation costs may arise. Some lenders will accept A3 with conditions. Others will not.

B1. Combustible materials present in the wall system itself, but the risk is sufficiently low that remedial works are not required. Most lenders treat B1 similarly to A ratings, though not all.

B2. Adequate standard of safety not achieved. Remedial or interim measures have been identified. This is the rating that causes the most difficulty with lending and resale.

The practical interpretation: A1, A2, and B1 are usually workable, but still lender-dependent. A3 and B2 require evidence of funding, leaseholder protection, and specific lender acceptance.

Do not assume B2 is impossible to buy. Practitioners on Reddit discuss B2-rated flats where mortgageability depends on the lender, the funding evidence, and the remediation status. But they consistently warn that a B2 flat needs a meaningful discount because the buyer inherits disruption, uncertainty, and real resale risk.

Building Safety Act Protections and Who Pays

This is the cost and liability piece of checking cladding risk before making an offer. If remediation work is needed, the critical question is whether you, as buyer, would be expected to pay.

Qualifying leaseholder protections

GOV.UK says leaseholder protections apply where:

• The building is above 11m or at least five storeys.
• There is a long lease of a single dwelling.
• The leaseholder is responsible for service charge.
• The lease was granted before 14 February 2022.
• On 14 February 2022, the property was the leaseholder’s main home, or the leaseholder owned no more than three UK residential properties.

Protections automatically transfer to future buyers of a property that was eligible on 14 February 2022. This is good news for buyers, but it means you need to verify that the original conditions were met.

What protections do not cover

Buildings below 11m are excluded from Building Safety Act leaseholder protections entirely. GOV.UK says lower-rise buildings are less likely to need costly works, but a small number will. If a building under 11m does need work and there is no government funding, leaseholders may face bills with no statutory cap.

Also, some non-cladding fire-safety defects have different cap rules. “Protected” does not always mean “zero cost.” It means capped or funded through specific routes, depending on the defect type and the building’s circumstances.

Documents to ask for

Before making an offer on any flat with suspected cladding risk, request the Landlord’s Certificate and the Leaseholder Deed of Certificate. These establish who is liable for what. If neither exists and the building has visible cladding on a block over 11m, that is a significant red flag.

For context on how fire-safety history and high service charges interact in real flats, BackStory’s Hatton Garden sample shows a case where a historic fire-safety flag had to be definitively cleared before price even mattered.

Green, Amber, Red: A Decision Framework

Most guides explain the EWS1 system and stop. They do not give buyers a framework for deciding whether to proceed. Here is one.

Green: proceed, but verify through your solicitor

The building has no visible cladding or risky balcony system. The Fire Risk Assessment and external wall assessment raise no concerns. The lender or valuer does not require an EWS1, or the EWS1/FRAEW evidence is satisfactory. Insurance premiums are normal and service charges show no fire-safety surcharges.

Even in a green scenario, your conveyancer should still review fire-safety documents before exchange.

Amber: proceed only with conditions or a price adjustment

The EWS1 is missing but may not be required. Or it exists but is old, and lender acceptance is uncertain. Or the building is in a remediation scheme but there is no clear start date or completion timeline. Or the agent gives verbal reassurance but cannot produce documents.

Forum users on MoneySavingExpert describe exactly this pattern: lenders raising cladding queries mid-transaction while buyers have never seen the actual EWS1 despite agent assurances that “it’s all fine.”

In amber territory, make the offer conditional. Specify that your solicitor must review all external wall documentation and that your lender must confirm acceptance before you exchange.

Red: pause, renegotiate hard, or walk away

The EWS1 is B2 or A3 with no confirmed remediation funding. Your lender has said it will not lend. Leaseholder protection status is non-qualifying or unknown. The freeholder or managing agent cannot answer basic document requests. There are planned cladding costs with unclear caps. Remediation is paused or disputed. Building insurance has been refused or carries unusual exclusions.

Also watch for this signal: if comparable flats in the same block are selling at large discounts or repeatedly falling through, the market is already pricing in the risk. You should too.

Questions to Ask the Estate Agent Before Offering

If you are serious about checking cladding risk before making an offer, send these questions to the agent in writing before you submit a number.

1. Does the building have any external wall system, cladding, render, timber, metal panels, curtain wall glazing, or combustible balconies?
2. How many storeys is the building, and is it over 11m or over 18m?
3. Is there an EWS1 form? If yes, provide the form, rating, date, and signatory page.
4. If there is no EWS1, has the building owner confirmed in writing that one is not required?
5. Is there a recent Fire Risk Assessment?
6. Has a Fire Risk Appraisal of External Walls been completed, and what did it recommend?
7. Are any cladding or external wall works planned, underway, paused, completed, or disputed?
8. Who is paying for any works: developer, government scheme, freeholder, warranty, insurer, leaseholders, or unknown?
9. Is there a Landlord’s Certificate and a Leaseholder Deed of Certificate?
10. Have recent buyers in the building obtained mortgages, and with which lenders?

Propertymark’s residential sales questionnaire now includes questions on flammable external wall systems, EWS1 status, cladding type, remediation works, and buyer costs. These are not unusual requests. They are standard property-information questions.

If the agent refuses to answer or says “the solicitor will deal with all that later,” treat it as an amber flag, especially if the building has visible cladding or stacked balconies.

Conditional Offer Wording

If you decide to proceed after your initial cladding risk check, protect yourself with conditional offer language. Have your conveyancer tailor it, but the substance should cover:

“This offer is subject to satisfactory review by my solicitor, broker, and lender of all building-safety and external wall documents, including any EWS1, FRAEW, Fire Risk Assessment, remediation plan, funding confirmation, Landlord’s Certificate, Leaseholder Deed of Certificate, insurance information, and confirmation that there are no undisclosed cladding or fire-safety costs that would pass to me as buyer.”

For buildings where remediation is already known:

“This offer assumes that any required cladding or external wall remediation is fully funded by a government scheme, developer remediation contract, warranty, insurer, freeholder, or other confirmed route, and that no uncapped remediation cost will fall to me as buyer. If that cannot be evidenced before exchange, I reserve the right to renegotiate or withdraw.”

Reddit buyers who have been through this process consistently stress one point: if you do not state your conditions upfront, you lose negotiating power once you are emotionally and financially invested in the transaction. Buyers on the HousingUK subreddit report that the risk of cladding complications often surfaces only after an offer is accepted and money has been spent on solicitors and surveys.

What About Cash Buyers?

Cash buyers should be more careful, not less. The ability to buy without a lender does not remove remediation costs, service-charge demands, insurance problems, or resale risk. You might be able to complete where a mortgage buyer cannot, but you inherit every problem the lender was trying to avoid.

A cash buyer still needs to ask: can a future buyer get a mortgage on this flat? If not, your resale pool shrinks to other cash buyers, and the price typically drops to reflect that.

Buyers on Reddit confirm this anxiety cuts both ways. One thread discussed a B1-rated building with no Building Safety Act protection, where the buyer could get a mortgage today but worried that future mortgageability and resale could still be affected. The concern was not the present transaction but the exit.

What About Buildings Under 11 Metres?

Many buyers assume that buildings under 11m carry no cladding risk at all. That is not quite right. GOV.UK says lower-rise buildings are less likely to need costly works, but a small number will require remediation. And critically, Building Safety Act leaseholder protections do not apply below 11m.

This means if a short building does need work, you could face uncapped costs with no government safety net. The under-11m funding window closed on 9 October 2026 and new applications can no longer be submitted. If the building missed that window, the liability may fall directly to leaseholders.

Cladding Risk Is Not the Only Flat Risk

Cladding is one part of pre-offer due diligence for a UK flat. Lease length, ground rent mechanisms, service-charge history, freeholder quality, planning constraints, flood risk, EPC band, and local market conditions all matter too. A flat can have a clean EWS1 and still be a bad buy because of a short lease or an escalating ground rent.

For a broader view of how a flat that looks perfect on a listing can hide material risks, this article on hidden property problems walks through what buyers commonly miss. And if the flat started life as commercial space, the implications of office-to-residential conversions can affect value and mortgageability in ways that have nothing to do with cladding.

BackStory checks all of these risks in a single report for £30, scored with a clear verdict: proceed, proceed with conditions, or walk away.

Frequently Asked Questions

Is an EWS1 legally required to sell a flat?

No. GOV.UK, RICS, and Southwark Council all confirm that an EWS1 is not a legal requirement. It is a lender and valuer tool. But a lender may still require one before approving a mortgage, which can effectively block a sale even though there is no legal mandate.

Can I buy a flat without an EWS1?

Yes, but it depends on your lender. Some lenders will accept alternative evidence such as a FRAEW executive summary, inclusion in a remediation scheme, or a valid Leaseholder Deed of Certificate. UK Finance says participating lenders may consider these alternatives, subject to individual policy.

Who pays for an EWS1?

The building owner or managing agent typically arranges and pays for the assessment, since the EWS1 covers the whole building. Individual flat owners cannot usually commission one for just their unit.

Is a B2 rating always unmortgageable?

Not always. Some lenders will consider B2-rated buildings if remediation is funded through a government scheme or developer contract, the lease qualifies for Building Safety Act protections, and the lender’s specific criteria are met. But expect to need a meaningful discount and accept higher resale risk.

Do Building Safety Act protections pass to a buyer?

Yes, for qualifying properties. GOV.UK says protections automatically transfer to future buyers where the property was eligible on 14 February 2022. Ask your solicitor to verify the qualifying status before exchange.

Should I worry about cladding on a three-storey building?

Probably less, but do not ignore it entirely. GOV.UK says a small number of buildings under 11m do need work. And because Building Safety Act protections do not cover buildings below 11m, any remediation costs could fall to leaseholders without a cap.

What is the difference between EWS1 and FRAEW?

An EWS1 is a one-page lender and valuer form that summarises external wall risk as a rating. A FRAEW is the detailed technical assessment that examines the actual wall system, cladding, insulation, balconies, and fire-stopping. The FRAEW provides the evidence; the EWS1 communicates a summary outcome to lenders. From November 2026, RICS’ updated standard allows valuers to accept a FRAEW executive summary instead of an EWS1 in certain circumstances.

What should I do if the estate agent cannot answer my cladding questions?

Go directly to the managing agent or freeholder. If they cannot answer either, that silence is itself a risk factor. Do not make a clean offer on a building where nobody can explain the external wall position. Make the offer conditional, reduce the price, or walk away.

If you want the cladding and EWS1 position checked independently before you spend on solicitors or surveys, get in touch with BackStory or see how the process works.