UK Cladding & EWS1 Costs: How to Protect Your Mortgage in 2026

EWS1, Cladding and Mortgageability: Why the Cladding Crisis Still Matters in 2026

It has been nearly a decade since the Grenfell Tower fire, and yet thousands of UK leaseholders are still trapped in flats they cannot sell, cannot remortgage, and in some cases cannot insure at a sensible price. The Building Safety Act 2022 was meant to fix this. In some ways it has. In others, it has created new layers of paperwork, new arguments about who counts as a "qualifying leaseholder", and new disputes between freeholders, developers and the government over who actually foots the bill.

By 2026, the immediate panic about EWS1 forms has cooled. Most major lenders will now lend on flats without an EWS1 in certain circumstances, particularly buildings under 11 metres. But the underlying problem has not gone away. If your building has dangerous cladding or compartmentation defects, your flat's value, your monthly service charge, and your ability to remortgage at a competitive rate are all on the line. For an average leaseholder in a flagged block, the cost of doing nothing can run to £200 to £500 a month in higher service charges, plus thousands of pounds in lost equity when remortgage time comes around.

This guide will walk you through how to estimate what an EWS1 assessment and any follow-up remediation will actually cost you, what protections you have as a leaseholder, and how to keep your mortgage options as open as possible while the dust settles.

Understanding the EWS1 Form and What It Costs

The External Wall System Fire Review, or EWS1, is a one-page form signed by a qualified fire engineer or chartered surveyor. It states whether the external wall system, including cladding, insulation and balconies, meets fire safety standards. There are two main ratings: A, meaning no combustible materials of concern, and B, meaning combustible materials are present. Within those are sub-ratings such as A1, A2, A3, B1 and B2, and only A1, A2, A3 and B1 are generally considered mortgageable without remediation.

Who Pays for the EWS1 Assessment

The cost of obtaining an EWS1 falls on the building owner or freeholder, not individual leaseholders. However, that cost is almost always passed through the service charge unless protections apply. In 2026, a typical EWS1 assessment for a mid-rise residential block costs between £6,000 and £15,000, depending on building height, complexity of the cladding system, and whether intrusive investigations are required.

For high-rise buildings over 18 metres, intrusive surveys involving opening up wall sections can push assessment costs to £25,000 or more. Spread across, say, 40 flats, that is several hundred pounds per leaseholder just to find out whether there is a problem.

What Affects the Final EWS1 Cost

Several factors drive the price of an EWS1 assessment and any follow-up work.

Building Height

Building height is the biggest one, because anything over 18 metres triggers stricter regulatory oversight under the Building Safety Regulator.

Cladding Type

Cladding type comes next, with aluminium composite material (ACM), high-pressure laminate (HPL) and certain types of insulation flagged as higher risk.

Compartmentation Defects

Compartmentation defects, meaning missing fire breaks between flats, often cost more to fix than the cladding itself.

Balcony Materials

Balcony materials such as timber decking and combustible substrates have become a major remediation category in their own right.

Surveyor Availability

Surveyor availability matters more than people expect, because a shortage of qualified fire engineers means waiting lists of six to twelve months in some regions.

Calculating Cladding Remediation Costs in 2026

If your building fails its EWS1 assessment, the next question is the bill for fixing it. This is where leaseholders need to pay close attention, because the rules on who pays have shifted dramatically since the Building Safety Act came into force.

The Three Funding Routes for Cladding Remediation

In 2026, remediation funding generally flows through one of three routes:

1. Developer-funded remediation. Around 50 large developers have signed legally binding contracts agreeing to fix buildings they built or refurbished in the last 30 years, at their own expense.
2. Government-funded schemes. The Building Safety Fund covers cladding on buildings over 18 metres, and the Cladding Safety Scheme covers buildings between 11 and 18 metres, where no developer can be held responsible.
3. Leaseholder contributions. For non-qualifying leaseholders, or for non-cladding defects in certain scenarios, leaseholders may still face capped contributions.

Leaseholder Protections Under the Building Safety Act

The Building Safety Act introduced statutory caps on what qualifying leaseholders can be charged for non-cladding defects. As of 2026, those caps stand at £10,000 outside London and £15,000 inside London, spread over ten years. For leaseholders whose property was worth under £325,000 outside London or £1 million inside London on 14 February 2022, and who owned it as their principal home, cladding remediation costs cannot be passed on at all.

Typical Cladding and Remediation Cost Ranges

The actual costs vary enormously, but typical 2026 figures for mid-rise blocks look like this:

• Full ACM cladding replacement: £40,000 to £80,000 per flat
• HPL or timber cladding replacement: £25,000 to £55,000 per flat
• Compartmentation and fire-stopping works: £8,000 to £20,000 per flat
• Balcony remediation: £6,000 to £18,000 per flat
• Waking watch (interim fire patrols): £150 to £500 per flat per month

These figures explain why a single defective building can trigger six-figure financial stress for unprotected leaseholders, and why getting your qualifying status confirmed early is so important.

Real-World Example

Take Priya, a leaseholder in a 14-storey block in Manchester. Her EWS1 came back B2 in 2023 with ACM cladding and timber balconies. As a qualifying leaseholder whose flat was worth £210,000 in February 2022, she paid nothing for the cladding works, hit the £10,000 cap for non-cladding defects spread over ten years, and successfully remortgaged in 2025 once the developer contract was signed. Her neighbour, who owned four buy-to-let flats across the country, faced an uncapped bill estimated at £62,000. The difference came down to one form: the leaseholder deed of certificate.

Protecting Your Mortgage Options on Cladding-Affected Flats

Here is where the practical pain often bites hardest. Even if your building is in a remediation programme and your liability is capped, lenders will still look hard at the certainty of the funding pathway before approving a mortgage or remortgage.

What Lenders Want to See for EWS1 and Cladding in 2026

Major UK lenders, including the high street banks and most building societies, now follow a fairly consistent checklist:

1. An EWS1 form, ideally rated A1, A2, A3 or B1, dated within the last five years.
2. Evidence of remediation funding if works are required, such as confirmation of a developer contract or government scheme acceptance.
3. A leaseholder deed of certificate confirming your qualifying status under the Building Safety Act.
4. A landlord's certificate from the freeholder confirming the building's status.
5. Reasonable service charge projections, including any waking watch costs, for affordability assessment.

Without those documents, even a technically safe building can be deemed unmortgageable.

Remortgaging Strategies for Cladding-Affected Properties

If you are coming off a fixed rate in 2026 and your building is mid-remediation, you have several practical options.

Product Transfer With Your Existing Lender

The simplest is to stay with your existing lender on a product transfer, which avoids a new valuation and EWS1 check entirely. Most lenders will still offer their existing customers a new rate even on a flagged building.

Use a Specialist Mortgage Broker

If that is not available, a specialist broker with experience in cladding-affected blocks will know which lenders are currently lending on which building types.

Subject to Remediation Valuation

Some lenders will now offer a "subject to remediation" valuation, lending at the post-remediation value if a funded works programme is in place.

Shorter Fixed Rate

And a shorter fix, such as a two-year deal, can make sense if remediation is expected to complete within that window, freeing you up to remortgage at full value later.

Common Mortgage Objections, Honestly Addressed

A few worries come up again and again.

Will Requesting Paperwork Annoy My Freeholder?

"Will requesting all this paperwork annoy my freeholder?" It might, but they are legally obliged to provide it, and a polite written request creates the paper trail you need.

Will Multiple Mortgage Applications Hurt My Credit?

"Won't applying with multiple lenders damage my credit?" A broker will run soft searches first, so only the final application leaves a hard footprint.

Is It Worth the Hassle for a Small Flat?

"Is it worth the hassle if my flat is small?" Yes, because the gap between a mortgageable and unmortgageable valuation is often 15 to 25 per cent of the flat's value, which dwarfs any short-term inconvenience.

Selling a Flat With Cladding or EWS1 Issues

Selling a flat in a cladding-affected building remains difficult, but it is no longer impossible. Buyers and their solicitors will want the full evidence pack: EWS1, leaseholder certificate, landlord's certificate, remediation contract details, and service charge history. Be realistic about pricing. Even a fully funded remediation programme often results in a 10 to 20 per cent discount on equivalent flats in unaffected buildings, because buyers price in the disruption and uncertainty.

If you are buying, take a careful look at our guide to choosing the right house survey level before committing, because a basic valuation will not catch the issues that matter in a cladding-affected block.

The Wider Property Risk Picture: Cladding, EWS1, and Mortgageability

Cladding is not the only structural or regulatory risk that can derail your mortgage and your finances. Smart leaseholders and landlords think about these issues together rather than in isolation.

Energy Efficiency and Landlord Obligations

If you let out a flat in a cladding-affected building, you also need to be on top of energy efficiency rules. The path to EPC C for rented properties has been bumpy, with consultation after consultation, but the direction of travel is unmistakable. Our breakdown of MEES, EPC C and the costs landlords keep missing covers what you should be budgeting for alongside any cladding contribution.

Flooding and Other Building Risks

Cladding is the headline risk, but climate-related risks like flooding can hit valuations just as hard. If your block is near a river or in a low-lying area, lenders increasingly want to see flood risk assessments alongside fire safety paperwork. Our guide to protecting your home finances using UK river level and flood alerts is worth reading if your block sits in or near a Flood Zone 2 or 3 area.

EWS1 and Cladding: A Practical Action Plan for 2026

If you own a leasehold flat in a building that might be affected, here is a sensible order of operations for 2026. The whole sequence should take you a few hours of admin spread over a couple of months, and most of it costs you nothing beyond your time.

Step-by-Step Action Plan

1. Confirm your qualifying leaseholder status by checking ownership records and your principal residence position on 14 February 2022.
2. Request the EWS1 form from your managing agent or freeholder, along with the date and rating.
3. Ask for the landlord's certificate under the Building Safety Act, which the freeholder must provide.
4. Submit your leaseholder deed of certificate to formalise your protections.
5. Check the building's remediation pathway, whether developer-funded, Cladding Safety Scheme, or Building Safety Fund.
6. Get current service charge projections in writing, including any waking watch or insurance premium loading.
7. Speak to a specialist mortgage broker about your refinance options well before your current fix ends.
8. Keep a paper trail of every email, certificate and assessment for future buyers and lenders.

That structured approach turns a fog of uncertainty into a defendable position, both with lenders and with potential buyers down the line. Start with step one today, ideally within the next week if your fixed rate ends in the next twelve months.

EWS1, Cladding, and Mortgageability: Key Takeaways for 2026

The cladding crisis in 2026 is less a single national emergency and more a long, grinding process of building-by-building remediation. The Building Safety Act has given many leaseholders genuine protection, but only if they take the steps to claim it. The biggest mistake we see is leaseholders assuming their freeholder or managing agent is handling everything. Often they are not, or not fast enough.

The financial stakes are real. Your mortgageability, your service charge, your insurance premium and your ability to ever sell your flat all hinge on having the right paperwork in place and understanding where your building sits in the funding pipeline. Spend an afternoon getting your qualifying status confirmed and your deed of certificate filed, and you put yourself ahead of most of your neighbours.

Before you make any decisions about remortgaging or selling, run your specific scenario through our UK Cladding EWS1 Cost and Mortgageability Calculator to see how the numbers stack up for your building height, your qualifying status, and your remaining mortgage term. A clear plan beats a vague worry every time.

Sources

• Building Safety Act 2022 — leaseholder protections guidance, GOV.UK
• Cladding Safety Scheme, GOV.UK