EWS1 stands for External Wall System 1. It is a standardised process introduced by the Royal Institution of Chartered Surveyors (RICS), UK Finance and the Building Societies Association to provide lenders with confidence regarding the fire safety of a building’s external wall system.

Not every building requires an EWS1 assessment. Whether one is needed depends on factors such as:

• Building height
• External wall construction
• Presence of cladding or combustible materials
• Balconies and attachments
• Individual lender requirements

A qualified fire engineer can advise whether an assessment is appropriate for your building.

No. An EWS1 form is not a legal requirement and is not required by fire safety legislation. It is a valuation tool developed primarily for mortgage lenders to help assess lending risk on certain residential properties.

EWS1 assessments should only be undertaken by suitably qualified professionals with the appropriate fire engineering competence and professional indemnity insurance. Choosing an experienced fire engineering consultancy helps ensure the assessment is completed accurately and efficiently.

An EWS1 form is generally valid for five years, provided no significant changes have been made to the external wall system during that period. If substantial alterations are carried out, a new assessment may be required.

During an EWS1 assessment, the fire engineer may review:

• External wall construction
• Cladding materials
• Insulation systems
• Balconies and attachments
• Cavity barriers
• Fire stopping measures
• Available construction information
• Previous fire safety documentation

Where necessary, intrusive investigations may be recommended.

Following the assessment, the building receives one of several outcomes indicating whether remedial works are required before the external wall system can be considered acceptable for lending purposes.

The site inspection itself can often be completed within a day for many buildings, although larger or more complex developments may require additional time. The overall programme depends on document availability, access arrangements and whether intrusive investigations are necessary.

Yes. Many buyers and mortgage lenders request an EWS1 form before proceeding with a purchase. Having a completed assessment available can help reduce delays and provide reassurance during the conveyancing process.

If fire safety concerns are identified, the report will outline the findings and may recommend further investigations or remedial works. Once these have been completed, the building may be reassessed where appropriate.

The cost varies depending on factors including:

• Building size
• Height
• Complexity
• Number of elevations
• Availability of construction information
• Whether intrusive inspections are required

Please contact us for a tailored quotation based on your building.

Yes. Our experienced fire engineers provide professional EWS1 fire safety assessments for residential buildings across the UK, supporting developers, managing agents, freeholders, housing associations and property owners.

Our experienced fire engineers deliver clear, professional and impartial EWS1 assessments, helping clients understand the fire performance of external wall systems while supporting property transactions and regulatory compliance. We provide practical advice, detailed reporting and responsive service throughout the assessment process.