Types of Fire Risk Assessments Explained

The phrase “type of fire risk assessment” is often used to describe several different things.

For purpose-built blocks of flats, Type 1, Type 2, Type 3 and Type 4 are commonly used industry classifications. They describe which parts of the building are inspected and whether the assessment involves opening up the construction.

For offices, warehouses, schools, care premises and most other buildings, fire risk assessments are not normally classified in this way. The scope is instead determined by the premises, its occupants, activities, hazards and the depth of inspection required.

This distinction matters when obtaining quotations. Unless the assessment type and inspection boundaries are clearly defined, one provider may price a visual common-parts inspection while another allows for access to flats, destructive investigation or specialist input.

This guide explains the different types of fire risk assessment, when Type 1–4 terminology is appropriate and what clients should include when tendering for the service.

For a broader overview of the legal duties, assessment process and reporting requirements, see Fire Risk Assessments in the UK: The Complete Guide.

There is no single fire risk assessment classification system that applies to every type of premises throughout the UK.

The term can refer to:

• the Type 1–4 classifications used for purpose-built blocks of flats
• the type of premises being assessed
• whether the inspection is destructive or non-destructive
• whether the commission is a new assessment, review or reassessment
• the specific risks or occupancy arrangements involved

Type 1–4 are not four separate categories created by legislation. They are industry classifications used to describe the extent and intrusiveness of an assessment in purpose-built blocks of flats.

Fire safety legislation and guidance also differ between England and Wales, Scotland and Northern Ireland. Type 1–4 terminology is particularly associated with the purpose-built flats guidance applying in England and Wales. Clients should therefore confirm that the terminology and scope are appropriate for the location and building concerned. Scottish fire safety legislation generally applies differently to common areas of domestic blocks, while Northern Ireland publishes assessment guidance by premises type.

Whatever description is used, the assessment should still identify hazards, consider people at risk, evaluate precautions, record findings and establish how the assessment will be reviewed.

A Type 1 fire risk assessment is the usual starting point for many purpose-built blocks of flats.

It is a non-destructive assessment focused principally on the common parts, which may include:

• entrance halls, corridors and stairs
• escape routes and final exits
• communal fire doors and flat entrance doors
• plant rooms, risers and service cupboards
• emergency lighting and signage
• smoke-control and alarm arrangements
• firefighting facilities
• testing, maintenance and management records

The assessor does not normally inspect inside the living accommodation beyond the entrance door. Building materials are not opened up, although accessible risers, cupboards and other readily available areas may be examined.

A Type 1 assessment will usually be suitable where there is no evidence suggesting serious hidden defects in the structural fire protection. Official guidance for purpose-built blocks states that this is the basic assessment normally required and that more intrusive investigation should be based on a specific reason.

The assessor may recommend further investigation if visible evidence, previous reports or the building’s alteration history raises concerns about compartmentation or fire stopping.

A Type 1 FRA should not be confused with a detailed door-by-door inspection. Where the client requires a condition schedule and repair recommendations, a separate fire door survey may be needed.

A Type 2 fire risk assessment covers the same general areas as Type 1 but includes destructive inspection on a sampling basis.

Selected areas of the building may be opened to examine hidden construction, including:

• voids above ceilings
• service penetrations
• riser enclosures
• wall and floor junctions
• construction separating flats from common areas
• areas where missing fire stopping is suspected

Type 2 assessments are not normally required as a routine recurring exercise. They are more likely to be appropriate where there is evidence suggesting serious deficiencies that could allow fire or smoke to spread beyond the flat or compartment of origin.

The client must define who is responsible for opening up and making good. The scope may also need to address asbestos information, permits, resident communication and access to concealed areas.

A quotation for “a Type 2 FRA” is therefore not sufficiently detailed on its own. The tender should state the proposed number of openings, how samples will be selected and what happens if the initial investigation identifies wider concerns.

A Type 3 fire risk assessment extends the inspection into a sample of flats while remaining non-destructive.

It includes the common-parts assessment associated with Type 1 and may consider the following inside selected flats:

• escape arrangements
• domestic smoke and heat alarms
• internal doors protecting escape routes
• layout changes affecting evacuation
• alterations that could affect compartmentation
• risks that could affect other residents or the common parts

Type 3 may be appropriate where there are concerns about the safety of residents within flats, widespread alterations or the adequacy of precautions beyond the communal areas.

Access is a significant practical issue. The building owner or manager may not have unrestricted rights to enter every leasehold flat. The commission should therefore define:

• the proposed number of flats
• how the sample will be selected
• who will arrange appointments
• how refused or missed access will be handled
• whether repeat visits are included
• whether rented, leasehold and adapted flats should be represented

A Type 3 instruction without an access plan may result in a report based on an inadequate or unrepresentative sample.

Further guidance is available in Fire Risk Assessments for Blocks of Flats.

A Type 4 fire risk assessment is the most intrusive of the four classifications.

It covers the common parts and a sample of flats, with destructive inspection in both areas. Construction may be opened to investigate hidden compartmentation, fire stopping and the separation between flats.

This type of assessment should be reserved for circumstances where the available evidence justifies extensive investigation. It may be considered where:

• the building’s alteration history is unclear
• previous works were poorly documented
• serious compartmentation failures are suspected
• there is evidence that defects extend into flats
• a new owner has inherited a building with insufficient fire-safety information

A Type 4 commission may require coordination between the assessor, residents, managing agent, asbestos consultant, opening-up contractor and the contractor responsible for reinstatement.

It is not automatically the same as a comprehensive compartmentation survey. A Type 4 FRA uses destructive sampling to inform the overall assessment of life risk. A separate compartmentation survey may be required to locate and record defects throughout the building or prepare a detailed remedial specification.

The highest-numbered assessment is not automatically the best option. The correct type is the one proportionate to the building, available evidence and risks requiring investigation.

Type 1–4 terminology should not normally be applied to offices, warehouses, factories, schools, healthcare buildings or other non-residential premises.

For these buildings, the assessment should be defined by the premises type and its relevant risks.

An office assessment may focus on escape routes, electrical equipment, staff training and multi-occupancy arrangements. An industrial assessment may need to examine machinery, hot works, hazardous substances and combustible storage.

Sleeping accommodation requires additional consideration because occupants may be asleep or unfamiliar with the premises. Care and healthcare buildings may require assessment of staffing, resident dependency, progressive horizontal evacuation and compartmentation.

Mixed-use buildings require particular care because different occupancies and Responsible Persons may share escape routes, service areas or structural fire precautions.

Government, Scottish Government and Northern Ireland guidance is organised by premises type because the expected precautions differ according to the building’s use and occupants.

Further context on non-residential assessments is available in Fire Risk Assessments in Commercial Buildings.

A fire risk assessment review is not necessarily the same service as a full reassessment.

A review may consider whether:

• the building or its use has changed
• previous actions have been completed
• occupancy or management arrangements have altered
• new hazards have been introduced
• an incident or defect affects the existing conclusions

A reassessment usually involves a new inspection and updated report.

Clients requesting an “annual FRA” should clarify whether they require a documented review, site revisit, updated action plan or full replacement assessment.

See How Often Should a Fire Risk Assessment Be Reviewed? for further guidance.

Specialist surveys may also be required where the FRA identifies concerns outside its inspection depth. These could include fire-door, compartmentation, alarm, emergency-lighting or smoke-control surveys.

Before contacting Fire Risk Assessment Companies, clients should gather enough information to define the likely scope.

Useful information includes:

• building type, use, height and construction
• number and characteristics of occupants
• ownership and management arrangements
• areas under the client’s control
• evacuation strategy
• previous assessments and fire strategies
• known compartmentation or fire-door concerns
• refurbishment and alteration history
• access rights to flats or tenant areas
• whether destructive investigation is justified
• required reporting and action-plan format

A competent assessor can advise whether the proposed approach is suitable, but the agreed scope should be recorded before appointment.

Where several providers are invited to quote, they must be given the same building information and inspection requirements. Otherwise, the submitted prices may represent materially different services.

The tender should clearly state:

• the premises and areas included
• whether Type 1–4 terminology applies
• whether the inspection is destructive or non-destructive
• the required sample of flats, voids or other areas
• access and appointment arrangements
• who will complete opening-up and reinstatement
• available plans, previous reports and fire strategies
• known defects or alteration concerns
• required photographs, ratings and action priorities
• required assessor qualifications and experience
• programme and reporting deadlines
• assumptions and exclusions to be priced separately

Assessors should explain their methodology, site time, sampling approach, proposed personnel, quality-control process and arrangements for inaccessible areas.

For the wider procurement framework, see Fire Protection Tenders in the UK: The Complete Guide and How Commercial Fire Protection Tendering Works.

Common procurement and scoping mistakes include:

• assuming Type 4 is automatically better than Type 1
• using Type 1–4 terminology for unrelated premises
• requesting a “full FRA” without defining the boundary
• assuming Type 1 includes access inside flats
• tendering Type 3 without confirming access rights
• omitting opening-up and making good from Type 2 or Type 4
• confusing an FRA with a compartmentation or fire-door survey
• comparing bids based on different sample sizes
• treating a review as automatically equivalent to reassessment
• failing to act when further specialist investigation is recommended

A structured tender prevents these problems by giving each assessor the same scope, access assumptions and expected deliverables.

For clients commissioning an assessment

Use Fire Risk Assessment Companies to identify providers with relevant experience for the building and required inspection type.

A defined enquiry allows competence, methodology, sampling, reporting and price to be compared against the same requirements.

For assessors and fire-safety consultancies

View Fire Risk Assessment Tenders for opportunities with clear building information, assessment boundaries and deliverables.

Better-defined scopes reduce pricing uncertainty and allow competent assessors to demonstrate the quality of their proposed approach rather than competing on fee alone.

Are Type 1–4 assessments used for every building?

No. They are industry classifications principally associated with purpose-built blocks of flats. Other premises are normally assessed according to their use, occupants, hazards and required inspection depth.

Is a Type 1 fire risk assessment usually sufficient?

A Type 1 assessment is the normal starting point for many purpose-built blocks where there is no evidence of serious hidden structural fire-safety deficiencies.

Does a Type 3 assessment include every flat?

Not normally. It usually involves a representative sample. The number of flats, selection method and access arrangements should be agreed before appointment.

Is a Type 4 FRA a compartmentation survey?

No. A Type 4 FRA uses destructive sampling to support an overall assessment of life risk. A wider compartmentation survey may still be needed to identify and schedule defects throughout the building.

Can an assessor decide which type is required?

An assessor can advise on the appropriate scope, but the client should ensure that the final inspection boundaries, access requirements, exclusions and deliverables are documented before the work begins.