Fire Risk Assessment Types: 1, 2, 3 and 4

If a managing agent asks for a "Type 3" and you quote for a Type 1, you have priced the wrong job. If they ask for a Type 1 and you deliver something that opened up construction, you have done work nobody agreed to pay for and possibly disturbed asbestos on the way.

The Type 1 to Type 4 classification is the language blocks-of-flats instructions are written in. It is worth knowing precisely, including the two things about it that most summaries leave out: where it actually comes from, and what its source now says about its own currency.

This article summarises UK fire safety guidance for educational purposes and is not legal advice. The responsible person carries the legal liability for fire safety in the premises. For specific compliance questions, consult a competent fire risk assessor or your local fire and rescue authority.

Where the Classification Comes From

The four types are not in the Fire Safety Order. They are not a statutory classification, and they do not apply to offices, factories, care homes or any other premises type — they exist specifically for purpose-built blocks of flats.

They come from the guide Fire safety in purpose-built blocks of flats, commissioned in 2011 by the Local Government Group (from October 2011 the Local Government Association), which entrusted it to a sector-led group of stakeholders, and now published on GOV.UK by the Home Office. Section 35 of the guide sets the four types out.

Section 35.1 explains what the classification is actually varying:

"The scope of a fire risk assessment needs to be relevant to the nature of the premises and the amount known in respect of the structural protection. There are, in principle, four different types of fire risk assessment that can be carried out for a purpose-built block of flats. They differ in the extent to which the building is inspected."

That last sentence is the whole idea. The types are not tiers of quality or thoroughness of thought. They are scopes of inspection, varying on two axes: how far into the building you go, and whether you open anything up.

The caveat worth knowing before you cite it

The GOV.UK page carries a status note that is easy to miss and awkward to discover from a client:

"The guide was originally produced in 2011 and summarised the legislation, guidance and best practice at the time of writing and should be viewed as no longer comprehensive. The Home Office is working on a revised version of this guide which we intend to publish in 2025. In the interim, it is continued to be made available to fire safety professionals as it contains relevant and useful information for purpose-built blocks of flats."

The page also flags that the position in the guide on vulnerable persons is subject to developing policy following the Personal Emergency Evacuation Plans consultation — which has since produced its own Regulations, covered in our guide to PEEPs and who needs one.

The practical reading: the type definitions themselves are sound and still the sector's common language. The guide's summary of the surrounding legislation is fifteen years old and predates the Fire Safety Act 2021, the Fire Safety (England) Regulations 2022, section 156 of the Building Safety Act 2022 and the 2025 residential evacuation plan Regulations. Check the law against current legislation, not against the 2011 summary.

The Four Types

Type 1 — Common parts only, non-destructive

The guide's own characterisation:

"A Type 1 fire risk assessment is the basic fire risk assessment required for the purpose of satisfying the FSO."

Non-destructive does not mean superficial, and this is where quotes most often go wrong. A Type 1 still includes examination of at least a sample of flat entrance doors, and it considers the separating construction between the flats and the common parts so far as reasonably practicable — without opening anything up. Where there are demountable false ceilings in the common parts it may be appropriate to lift a sample of readily accessible tiles, and it will normally be appropriate to open a sample of service risers where access is practicable at the time.

So a Type 1 involves getting to the flat entrance doors and into the risers. It does not involve going beyond the flat entrance door into the flat.

On when it is enough, the guide is direct:

"Unless there is reason to expect serious deficiencies in structural fire protection – such as inadequate compartmentation, or poor fire stopping – a Type 1 inspection will normally be sufficient for most blocks of purpose-built flats."

And on escalating from it, there is a warning worth quoting to any assessor who has inherited a template:

"However, this should not be a generic recommendation of all Type 1 fire risk assessments; the recommendation should be based on identification of issues that justify reason for doubt."

A boilerplate "we recommend a Type 4 assessment" at the end of every Type 1 report is not a cautious habit. It is the specific thing the guide tells you not to do.

Type 2 — Common parts only, destructive

Same scope and objectives as a Type 1, except that construction is opened up on a sampling basis. That practically means a contractor on site to open up and make good afterwards, which is why it is priced and programmed differently rather than being a slightly longer Type 1.

To check the integrity of separating construction, the destructive inspection might sometimes include a sample of flats — but because of the nature of the work, that can often only be done in vacant flats.

The guide describes Type 2 as usually a one-off exercise, carried out only where there is good reason to suspect serious structural deficiencies that could lead to fire spreading beyond the flat of origin. And it closes off the most common shortcut explicitly: the age of the block alone is not generally sufficient to warrant a Type 2 inspection.

Type 3 — Common parts and flats, non-destructive

Type 3 includes everything in a Type 1 and then goes inside at least a sample of the flats, looking at means of escape and fire detection within them. The inspection inside is non-destructive, but the fire resistance of doors to rooms is considered. Measures to prevent fire are not considered unless they are within someone's control — the guide's example is maintenance of the electrical and heating installations where that sits with the landlord.

Two limits matter when scoping.

It goes beyond the Fire Safety Order. The guide says a Type 3 "goes beyond the scope of the FSO (though not the scope of the Housing Act)". Inside a flat is domestic premises, which Article 6 of the Order excludes. The reason a Type 3 is coherent at all is that housing legislation reaches where the Order does not — Part 1 of the Housing Act 2004 provides the HHSRS system for assessing the condition of residential premises. So a Type 3 sits across two legal regimes, and the report should say which duty each finding answers to.

Tenure decides whether it is even possible. The guide is blunt:

"This type of fire risk assessment will not be possible in the case of long leasehold flats, as there is normally no right of access for freeholders."

If the block is long leasehold, a Type 3 instruction cannot be delivered as specified regardless of budget or competence. That is a conversation to have before quoting, not after the first refused entry.

Where a Type 3 is appropriate: rented flats where there is reason to suspect serious risk to residents in the event of a fire in their own flats — the guide's examples are the age of the block, or grounds to suspect widespread unauthorised material alterations.

Type 4 — Common parts and flats, destructive

Same scope as a Type 3, with destructive inspection in both the common parts and the flats on a sampling basis. Contractor on site to open up and make good; and as with Type 2, destructive work inside flats can often only be done in vacant ones.

The guide calls this the most comprehensive of the four and immediately narrows it: it "will only be appropriate in limited circumstances". Its worked example is a new landlord taking over a block where the history of works carried out is unknown and there is reason to suspect serious risk to residents from both a fire in their own flats and a fire in neighbours'.

There is also a safety note attached specifically to the destructive types, which belongs in any scoping conversation:

"Note: Before destructive inspection is to be carried out, the risk of disturbing asbestos should be considered (eg by examination of the asbestos register)."

Choosing the Scope

The decision is not "which type is best". It is "what do we already know, and what would opening up actually resolve?"

1. Default to Type 1. It satisfies the Order for the common parts and it is sufficient for most purpose-built blocks. Start here unless something displaces it.
2. Ask what the doubt is about. Doubt about structural fire protection — compartmentation, fire stopping, separating construction — points at the destructive types. Doubt about conditions inside flats points at Type 3.
3. Check the tenure before promising Type 3 or 4. Long leasehold usually rules them out on access.
4. Check whether the flats can be vacated. Destructive work inside flats is often only practicable in vacant ones, which constrains programme more than price.
5. Name the trigger in the report. If you are recommending an escalation, the recommendation has to rest on identified issues. "The block is old" is expressly not enough for a Type 2.
6. Check the asbestos register before any destructive inspection.

Scope also drives price, and the four types are why "how much is a fire risk assessment for a block of flats" has no single answer — a Type 1 and a Type 4 on the same building are different jobs with a contractor attached to one of them. Our guide to fire risk assessment costs covers what drives the fee, and the free FRA cost calculator will give an estimate by building type and complexity.

What the Types Do Not Tell You

Three things the classification is silent on, and each of them gets assumed.

It says nothing about competence. A Type 4 by someone out of their depth is worth less than a Type 1 by someone who is not. Competence is a separate duty under Article 18 of the Order.

It says nothing about frequency. No type carries a review interval. The review duty comes from Article 9(3) and turns on the building and what has changed — see how often a fire risk assessment should be reviewed, and the free FRA review date calculator for setting the next date.

It says nothing about report quality. The type fixes what you looked at, not how well you recorded it. Two Type 1 reports on the same block can differ enormously in whether the findings are traceable, risk-rated and actionable. The free FRA report quality scorer flags the common gaps.

Summary

Type 1 to Type 4 are inspection scopes for purpose-built blocks of flats, from the Home-Office-hosted guide Fire safety in purpose-built blocks of flats, section 35. They vary on how far into the building you go and whether construction is opened up: Type 1 common parts non-destructive, Type 2 common parts destructive, Type 3 common parts and flats non-destructive, Type 4 common parts and flats destructive.

Type 1 is the default and is normally sufficient. The other three follow identified doubt, and the guide is explicit that escalation must be based on issues justifying that doubt rather than recommended as a matter of course. Long leasehold usually forecloses Types 3 and 4 on access alone, and destructive inspection carries an asbestos check before it starts.

One caveat to carry: GOV.UK itself says the guide should be viewed as no longer comprehensive and that a revised version is in preparation. The type definitions hold; the guide's 2011 summary of the surrounding law does not.

For assessors running blocks-of-flats work, AssessKit keeps the scope, the findings and the action plan together per site, and holds review dates so nothing lapses unnoticed. Start free — the Free plan covers two assessments a month, no card required. See pricing or read about who is building it.

Sources

• Fire safety in purpose-built blocks of flats (GOV.UK, Home Office)
• Fire safety in purpose-built blocks of flats — full guide PDF, section 35 "Types of fire risk assessment" (GOV.UK)
• Regulatory Reform (Fire Safety) Order 2005, Article 6 — Application to premises (legislation.gov.uk)
• Regulatory Reform (Fire Safety) Order 2005, Article 9 — Risk assessment (legislation.gov.uk)
• Housing Act 2004, section 1 — the HHSRS system (legislation.gov.uk)