What is a fire compartmentation survey and do I need one?

If you manage a building in the UK, you've probably heard the term "fire compartmentation" but what does it actually mean, and when do you need a survey?

This guide explains exactly what a fire compartmentation survey involves, who needs one, and what happens if you don't have one.

What is fire compartmentation?

Fire compartmentation is the process of dividing a building into separate fire-resistant sections called compartments using walls, floors, ceilings, and doors that are designed to contain fire and smoke for a defined period.

The idea is simple: if fire breaks out in one area of a building, compartmentation limits how quickly it can spread to other areas. This buys time for occupants to evacuate and for the fire service to respond.

Every element of a compartment the walls, the ceiling, the floor, the doors, the seals around pipes and cables must work together. A single gap, damaged seal, or ill-fitting door can compromise the entire compartment.

What is a fire compartmentation survey?

A fire compartmentation survey is a systematic inspection of a building's passive fire protection systems. It assesses every element that contributes to the integrity of fire compartments, including:

• Fire doors and frames - condition, gaps, seals, ironmongery, self-closing function

• Fire-rated walls and ceilings - visible damage, penetrations, unauthorised modifications

• Service penetrations - where pipes, cables and ducts pass through compartment walls or floors, these must be correctly fire-stopped

• Cavity barriers - concealed barriers within roof spaces, voids and wall cavities that prevent fire travelling through hidden spaces

• Intumescent seals and collars - around pipework and service entries

The survey produces a detailed report identifying any deficiencies, with photographs, locations, and recommendations for remediation.

Who needs a fire compartmentation survey?

Under the Regulatory Reform (Fire Safety) Order 2005, the Responsible Person for any non-domestic building or any building containing two or more domestic premises must ensure the building's fire safety measures are maintained and regularly assessed.

The Building Safety Act 2022 strengthened these duties significantly, particularly for higher-risk buildings (those over 18 metres or 7 storeys with residential use).

A fire compartmentation survey is typically required in the following circumstances:

• High-rise residential buildings - mandatory under the Building Safety Act 2022 for higher-risk buildings

• Care homes and hospitals - where occupants may have limited ability to self-evacuate

• HMOs and blocks of flats - landlords and managing agents have a legal duty to maintain compartmentation

• Commercial premises - offices, retail, warehouses and mixed-use buildings where the fire risk assessment identifies compartmentation as a key control measure

• Following building works - any refurbishment, fit-out or maintenance work that involves penetrating fire-rated elements must be followed by verification that compartmentation has been restored

• Change of use - when a building or part of a building changes its use, compartmentation must be reassessed

  
  

How is it different from a fire door inspection?

A fire door inspection focuses specifically on fire doors; their condition, compliance with BS 8214, self-closing function, gaps and seals.

A fire compartmentation survey is broader. It covers fire doors as one element, but also assesses the entire passive fire protection strategy of the building walls, floors, service penetrations, cavity barriers and more.

In practice, many buildings need both. A fire door inspection confirms the doors themselves are compliant; a compartmentation survey confirms the wider system they sit within is intact.

What happens if compartmentation is compromised?

Compromised fire compartmentation is one of the most common and most dangerous building safety failures. The consequences are serious:

• Regulatory action - the Fire and Rescue Service has powers to issue enforcement notices, prohibition notices, and prosecute under the Fire Safety Order

• Insurance implications - insurers may decline claims or void policies if compartmentation deficiencies are found following a fire

• Civil liability - building owners and managing agents can face significant civil claims if inadequate compartmentation contributes to injuries or deaths

• Reputational damage - particularly for care home operators, housing associations, and managing agents with duty-of-care obligations

  
  

How often should a compartmentation survey be carried out?

There is no single statutory frequency — it depends on the type of building, its risk profile, and the outcomes of your fire risk assessment.

As a general guide:

• Higher-risk buildings (under the Building Safety Act 2022) - at least every five years, or following any significant works

• Care homes and hospitals - annually or in line with the fire risk assessment review cycle

• Standard commercial and residential - every three to five years, or following refurbishment

  
  

Any time significant building works are carried out a new fit-out, a new service run, a loft conversion, an extension; compartmentation should be surveyed in the affected areas before the works are signed off.

What should I look for in a surveyor?

Fire compartmentation surveys require specialist knowledge of passive fire protection systems, building construction, and current legislation. When appointing a surveyor, look for:

• Third-party accreditation - BAFE, FIRAS, or FDIS registration demonstrates competence and independence

• BMTRADA Q-Mark certification - the gold standard for fire door and passive fire protection inspection

• Experience with your building type - care homes, HMOs, and commercial buildings each have their own compliance considerations

• Detailed reporting - a good survey report includes photographs, precise locations of deficiencies, and prioritised remediation recommendations

How can Fire Door Surveys Ltd help?

At Fire Door Surveys Ltd, we carry out fire compartmentation surveys across Manchester, Liverpool, Leeds, Sheffield, and London.

We provide clear, photographic reports with prioritised action lists, and we can carry out any remediation works identified from fire door replacement to intumescent seal installation and fire-stopping of service penetrations.

If you're unsure whether your building needs a compartmentation survey, contact us for a no-obligation conversation.

📞 0161 706 0766 📧 info@firedoor-surveys.com 🌐 firedoor-surveys.com