Years after Grenfell froze the market for thousands of flats, the position has genuinely improved, lenders now take a more risk-based approach and an EWS1 isn't always required. This guide covers exactly which buildings need one, what each rating actually means to a lender, the real scope (and real limits) of Building Safety Act leaseholder protections, and the practical documents to have ready when buying, selling, or remortgaging.
Figures below reflect the Building Safety Act 2022, RICS EWS1 valuation guidance, and published 2026 lender and legal guidance, current to mid-2026. This is general information, not legal or valuation advice; a specific building's position should be confirmed with the freeholder, managing agent, and your own solicitor.
1. What an EWS1 form actually is
The External Wall System review form, known as EWS1, exists purely for valuation and mortgage lending purposes. It is not a legal requirement and not a fire safety certificate, RICS is explicit on both points. One form covers the entire building; individual leaseholders don't obtain their own, and it's typically commissioned by the freeholder, right-to-manage company, or managing agent. The assessment looks at the whole external wall system: cladding panels, insulation, fire breaks, and balconies.
2. Do you actually need one: the height thresholds
| Building height | Likely EWS1 requirement |
|---|---|
| Over 18 metres, with cladding or balconies | Most likely to require one |
| 11 to 18 metres | Only where specific risk factors are present |
| Under 11 metres | Generally not required |
Government policy treats buildings under 11 metres as inherently lower risk and rarely requiring remediation, and the Building Safety Act's leaseholder protections don't currently extend to this band either. In practice, most low-rise blocks of four storeys or fewer don't need an EWS1 at all, though individual lender criteria still vary, and specific risk features such as ACM, MCM, or HPL cladding can still trigger a requirement even in a shorter building.
3. What each rating means to a lender
A B2 rating means the assessor has concluded remediation work is needed before the external wall system can be confirmed as low risk, and this will usually block mortgage lending until that remediation is evidenced, or a funded, agreed remediation plan is in place. Crucially, a B2 rating does not mean the building is unsafe for occupation, and it doesn't trigger evacuation or building closure. A1 to A3 and B1 ratings are generally acceptable to lenders without further conditions.
4. What the Building Safety Act actually protects you from
Under the Building Safety Act 2022, developers who built or refurbished a building with relevant defects within the past 30 years hold primary liability for remediation. Where a developer can't be pursued, the freeholder or landlord holds secondary liability, subject to means-tested caps. Qualifying leaseholders are protected from having cladding remediation costs passed through the service charge, and these protections apply retrospectively, a building owner cannot demand payment of invoices simply because they were issued before the protections existed.
5. The cost gap most guides don't mention
The leaseholder protections apply specifically to defined "relevant building safety defect" costs, and this is narrower than it first appears. An EWS1 assessment cost, a waking watch cost, or a fire door inspection programme cost may not fall within that specific definition, even though all three arise directly from the same underlying cladding problem. Whether a specific charge is protected is genuinely fact-sensitive and not always straightforward, legal advice is often needed to establish exactly what is and isn't covered in a particular block before challenging an individual service charge line.
Where remediation genuinely can't be funded by a developer or landlord, the government-funded Cladding Safety Scheme, administered by Homes England, provides grant funding specifically for eligible buildings between 11 and 18 metres.
6. How lenders actually approach it in 2026
Since RICS valuation guidance published in December 2022, and updated further since, several of the UK's biggest lenders have taken a more workable position: many will consider applications on buildings 11 metres and over even where cladding issues exist, provided there's evidence of an agreed, funded remediation plan from the developer or government. Some lenders go further and will lend irrespective of the building's height or whether remediation work has commenced, given the correct supporting evidence. RICS published a second edition of its EWS1 valuation guidance in May 2026, with an effective date of 1 November 2026, so this is a genuinely live area rather than a settled one, and worth checking for the current position before assuming either the strictest or the most lenient scenario applies to a specific building.
7. Documents to have ready
- The building's EWS1 form, if one exists, obtained from the freeholder or managing agent.
- The fire risk assessment for the building.
- A Leaseholder Deed of Certificate, where relevant, confirming your qualifying leaseholder status for the purposes of the Building Safety Act's cost protections.
- Evidence of any agreed, funded remediation plan, if the building has known cladding issues, since this is what unlocks lending from many mainstream lenders even before works are complete.
8. Frequently asked questions
Does my flat need an EWS1 form?
It depends mainly on the building's height. Buildings over 18 metres with cladding or balconies are most likely to need one; buildings of 11 to 18 metres only where specific risk factors are present; buildings under 11 metres generally don't, since government policy treats these as inherently lower risk. Individual lender criteria still vary even within these bands.
What does a B2 EWS1 rating mean for my mortgage?
A B2 rating means the assessor has concluded that remediation work is needed before the external wall system can be confirmed as low risk, and it will usually block mortgage lending until that remediation is evidenced or a funded, agreed remediation plan is in place. It does not mean the building is unsafe to live in or that evacuation is required; A1 to A3 and B1 ratings are generally acceptable to lenders without further conditions.
Am I protected from paying for cladding remediation as a leaseholder?
Qualifying leaseholders are protected from paying for cladding remediation costs under the Building Safety Act 2022, with developers holding primary liability and freeholders secondary liability subject to means-tested caps. However, these protections apply specifically to defined "relevant building safety defect" costs, and related costs such as an EWS1 assessment itself, a waking watch, or a fire door inspection programme may fall outside that definition even though they arise from the same underlying cladding problem.
Can I get a mortgage on a flat with unresolved cladding issues?
Often yes, more so than in the years immediately following the disruption. Since RICS valuation guidance from January 2023, many lenders will consider applications on buildings 11 metres and over even with cladding issues, provided there's evidence of an agreed, funded remediation plan from the developer or government, and some lenders will lend regardless of height or remediation status given the right documentation.
Continue your research
About the author
✓ Editorially reviewed — all Poqet guides are checked for factual accuracy before publication and updated when UK rates or legislation change. Editorial Policy