Expect a detailed inspection of the fire-resisting construction: compartment walls and floors, fire doors, fire stopping at service penetrations, cavity barriers in concealed spaces and the protected escape routes. The survey typically includes invasive inspection, such as lifting ceiling tiles and opening hatches, and the report provides a prioritised schedule of remedial works.
Why compartmentation matters
Fire compartmentation is the primary passive fire protection measure in residential blocks of flats. It prevents fire and smoke spreading from the flat of origin to other parts of the building, supporting the stay-put strategy that most purpose-built blocks rely upon. Deficiencies in compartmentation are common and can have serious life-safety implications.
The survey process
A compartmentation survey involves a detailed inspection of all fire-resisting construction: compartment walls and floors, fire doors, fire stopping at service penetrations, cavity barriers in concealed spaces, and the integrity of the protected escape routes. The survey typically includes invasive inspection, lifting ceiling tiles and opening hatches to check concealed areas where deficiencies are most commonly found.
Common deficiencies
The most frequent findings include missing or inadequate fire stopping around pipes, cables and ducts passing through compartment walls and floors; fire doors that fail to close properly, have missing seals or damaged glazing; gaps above suspended ceilings where compartment walls do not extend to the structural soffit; missing cavity barriers in roof voids; and breaches caused by subsequent building works or tenant alterations.
Remediation
Remediation is prioritised by risk and typically involves installing or replacing fire stopping, replacing non-compliant fire doors, extending compartment walls to full height, installing cavity barriers, and repairing breaches. The survey report provides a prioritised schedule of works that allows the building owner to plan remediation in a structured way.
Frequently asked questions
What is fire compartmentation?
The subdivision of a building into compartments using fire-resisting walls, floors and doors to prevent fire and smoke spreading. Fundamental to the stay-put strategy in residential blocks.
What does a compartmentation survey involve?
Detailed inspection of fire doors, fire stopping, compartment walls and floors, cavity barriers and concealed spaces, typically including invasive inspection above ceilings and within risers.
What are the most common deficiencies?
Missing fire stopping around service penetrations, non-compliant fire doors, gaps above suspended ceilings, missing cavity barriers and breaches from subsequent works.
How much does remediation cost?
Fire stopping: £10,000 to £50,000. Fire door replacement: £75,000 to £200,000 for a typical block. Costs vary by building size and extent of deficiencies.
How we can help
Fire Compartmentation
Comprehensive compartmentation surveys and remediation specifications.
View ServiceFire Door Inspections
Detailed fire door inspections in accordance with current standards.
View ServiceRequest a Consultation
Discuss compartmentation survey requirements for your building.
Contact UsPassive Fire Protection Surveys London
Surveys covering compartmentation, fire stopping, cavity barriers, risers and service penetrations.
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Savas Bulduk
BSc (Hons) MRICS, Director & Chartered Building Surveyor.
Writes on Building surveying, Fire safety and facade, External wall systems, Technical due diligence, Contract administration. See the full team profile.