EWS1, cladding and the external wall review

The external wall of a residential block used to be something a manager rarely thought about. It kept the weather out and the heat in, and it was somebody else's problem during construction. That changed after Grenfell. The wall is now one of the first things a regulator, a lender, an insurer or a prospective leaseholder will ask about, and the paperwork that describes it has become a small industry of its own. EWS1 forms, external wall fire reviews and cladding remediation schedules now sit at the centre of how a building is valued, sold and managed. The trouble is that these documents are widely misunderstood, and the confusion costs leaseholders and managers real time and money.

What EWS1 actually is, and what it is not

EWS1, the External Wall System form, is not a statutory safety certificate. It was introduced by RICS, UK Finance and the Building Societies Association as a way for valuers and lenders to record, in a standard format, that the external wall of a building had been assessed by a suitably qualified professional. It exists to answer a mortgage lender's question, not a regulator's. A building does not need an EWS1 to be safe, and the absence of one does not mean a building is dangerous. It means a lender has not yet been given the assurance it wants before agreeing to lend against a flat in that block.

This distinction matters because EWS1 is often treated as the safety document for the external wall. It is not. The form is a summary, signed by a qualified professional, that points to the underlying assessment. The real engineering judgement lives in the fire risk appraisal of the external wall behind it.

Where the external wall review fits

The substantive assessment is the fire risk appraisal of external walls, carried out under PAS 9980, the code of practice published to give assessors a consistent method for judging the fire risk presented by a wall system. PAS 9980 moved the conversation on from a blunt pass or fail. Rather than asking only whether a wall contains a particular material, it asks the assessor to weigh the whole system: the cladding, the insulation, the cavity barriers, the attachments such as balconies, and how those interact with the building's height, layout and means of escape.

The Fire Safety Act 2021 made the relationship between this work and the wider fire risk assessment explicit. It clarified that the fire risk assessment required under the Regulatory Reform (Fire Safety) Order 2005 must cover the building's structure, its external walls including cladding and balconies, and the flat entrance doors. So the external wall is no longer a separate conversation that sits to one side of the FRA. It is part of the responsible person's assessment, and the PAS 9980 appraisal is how the external wall portion of that assessment is done properly. For the broader picture of what an FRA should achieve, our note on the fire risk assessment beyond a tick-box sets out the wider expectations.

Why so many buildings got stuck

When the EWS1 process arrived, demand for qualified assessors vastly outstripped supply, and a cautious market treated any building with any cladding as suspect until proven otherwise. Mid-rise blocks that posed little real risk were swept into the same queue as genuine higher-risk buildings, and flats became unsellable while owners waited for an assessment that might be years away. PAS 9980 was, in part, a response to that over-caution. By giving assessors a structured way to reach a proportionate judgement, it allowed more buildings to be cleared without remediation, and reserved intervention for the walls that genuinely warranted it.

For a building manager, the lesson is that the right answer is rarely a single yes or no. It is a documented, reasoned appraisal that a valuer, a lender and a regulator can each read and rely on.

What a manager should hold on file

Whatever the height of your building, the external wall is now part of the evidence trail you are expected to maintain. The records worth keeping in order include:

• The fire risk appraisal of the external wall, with the assessor's qualifications and the date it was carried out.
• Any EWS1 form issued, cross-referenced to the appraisal it summarises rather than floating on its own.
• The construction information you hold on the wall build-up: cladding type, insulation, cavity barriers and balcony attachments.
• Photographs and plans that show the elevations and any areas of concern.
• A record of any remediation carried out, by whom, and the sign-off that closed it.

This is, in effect, part of the golden thread for the building. An accurate, current digital record of how the wall is built and what has been assessed is exactly the kind of information that is meant to follow a building through its life. Plans and photographs of the elevations belong in the same place as the appraisal, not in a separate folder, which is why we have written separately on why floor plans belong in your compliance system, not a drawer.

Keeping the evidence current

The weakness in most cladding files is not that the appraisal was never done. It is that the appraisal sits in an email from two years ago, the EWS1 form is in a different inbox, and nobody can quickly say which version is current or what has changed since. When a lender, an insurer or the Building Safety Regulator asks, the manager spends a week assembling something that should take an afternoon.

The fix is to treat the external wall as a managed asset with its own living record. The appraisal, the form, the construction detail, the photographs and any remediation should sit together, dated and owned, and update as the building does. In SAMRISK, that evidence lives alongside the building's risk assessments and building plans, so the external wall story can be read in order without a guided tour.

None of this is legal advice, and the regime around external walls continues to move. What does not change is the underlying discipline: know how your wall is built, hold a proportionate and qualified appraisal of it, and keep that evidence somewhere a stranger could follow tomorrow.