Life After a Failed EWS1: Common Remedial Works and What They Actually Involve

A failed EWS1 assessment can feel like a major setback for building owners, managing agents, and residents alike. Suddenly, concerns around safety, compliance, funding, and timelines all come sharply into focus.

While every building is different, the reality is that many EWS1 failures lead to very similar remedial requirements. Understanding what these works typically involve can help you plan more effectively, set realistic expectations, and avoid unnecessary delays.

This guide breaks down the most common remedial works following a failed EWS1 assessment and explains what they actually mean in practice — helping building owners and managing agents understand the next steps.

Common Remedial Works After a Failed EWS1

1. Removal and Replacement of Combustible Cladding

One of the most significant remedial measures is the removal of combustible cladding materials.

This may involve:

• Full or partial strip-out of existing cladding systems
• Replacement with non-combustible or limited-combustibility materials
• Temporary weather protection while works are carried out

These works are often complex, require specialist contractors, and can have a substantial impact on programme and cost.

2. Installation or Correction of Cavity Barriers

Missing, incorrectly installed, or poorly maintained cavity barriers are a frequent cause of EWS1 failure.

Remedial works typically include:

• Opening up the façade to expose cavities
• Installing compliant horizontal and vertical cavity barriers
• Ensuring correct fixing, compression, and continuity
• Fire stopping around window heads, sills, and interfaces 

Proper cavity barrier installation is critical to preventing unseen fire spread within external wall cavities.

3. Slab Edge and Compartmentation Fire stopping

The junction between floor slabs and external walls is a high-risk area and is closely scrutinised during EWS assessments.

Common remedial actions include:

• Reinstating missing or damaged slab edge fire stopping
• Replacing non-compliant materials with tested systems
• Ensuring continuity between internal compartmentation and the external wall system

This work often involves coordination between façade specialists and passive fire protection contractors.

4. Remediation of Service Penetrations and Interfaces

Services passing through external walls can compromise fire performance if not correctly sealed.

Typical works include:

• Upgrading fire stopping around pipes, cables, and ductwork
• Correcting poorly sealed penetrations
• Addressing interface details between cladding, fire stopping, and internal walls

Even small defects in these areas can contribute to EWS1 failure.

5. Removal of Non-Compliant Insulation Materials

Some buildings fail due to combustible insulation hidden behind otherwise compliant cladding.

Remedial works may require:

• Removing façade sections to access insulation
• Replacing insulation with compliant alternatives
• Rebuilding parts of the external wall system

This can be particularly disruptive but is essential for achieving compliance.

6. Improving Access and Inspection Provisions

In some cases, buildings fail not solely due to defects, but because inspectors cannot verify what is present.

Remedial measures may include:

• Creating inspection openings
• Improving record-keeping and as-built documentation
• Providing photographic and installation evidence

Clear evidence can be just as important as the physical works themselves.

Temporary Fire Safety Measures While Remediation Is Planned

Where immediate remediation is not possible, temporary measures may be required to manage risk, such as:

• Enhanced fire detection or alarm systems
• Waking watch arrangements (where appropriate)
• Interim fire risk assessments

These measures should always be reviewed regularly and must not be seen as a long-term solution.

What to Expect During the Remediation Process

Following an EWS1 failure, building owners and managing agents should expect:

• Detailed intrusive surveys to confirm the full scope of issues
• A phased remediation programme
• Coordination between multiple specialist contractors
• Ongoing communication with residents
• Regular liaison with fire engineers and assessors

Early engagement with experienced contractors can significantly reduce delays and rework.

Preparing for an EWS Re-Assessment

Once remedial works are complete, preparation for re-assessment is essential. This includes:

• Ensuring all works are fully documented
• Retaining test evidence and product certifications
• Photographing installations before areas are closed up
• Carrying out internal quality inspections

A well-prepared building stands a far better chance of achieving a positive EWS outcome.