What is an inner room?

In fire safety, an inner room is usually a room where the only way out is through another room, called the access room.

For example, if someone is in a small back office and the only way to leave is through a front shop area, the back office may be an inner room.

This matters because if a fire starts in the access room, the person inside the inner room may not be able to escape safely.

Simple example of an inner room

A small shop has:

• A front sales area
• A small rear office
• No rear exit from the office
• The only escape route from the office goes through the shop

In this example, the rear office could be an inner room because someone in the office must pass through the shop to escape.

That does not automatically mean the premises is unsafe, but it does mean the arrangement needs to be considered carefully in the fire risk assessment.

What is not usually an inner room?

Not every room that opens into another space is an inner room concern.

Normal circulation spaces do not usually count as access rooms in the same way. For example, it is normal for rooms to open into:

• A corridor
• A hallway
• A lobby
• A protected staircase
• A final exit route

If a room opens directly into a proper escape route, such as a corridor or hallway leading to an exit, that is usually different from having to escape through another working room.

This is why the wording in a fire risk assessment is important. The question is not simply “does this room connect to another space?” The real question is whether someone must escape through another room rather than through a normal escape route.

Why do inner rooms matter?

Inner rooms matter because a fire in the access room can block the only escape route.

The Regulatory Reform (Fire Safety) Order 2005 says emergency routes and exits must lead as directly as possible to a place of safety, and that people must be able to evacuate as quickly and safely as possible. Read Article 14 of the Fire Safety Order.

If a person inside an inner room would not know about a fire early enough, or would not be able to get past the fire safely, the risk may be unacceptable.

Common places where inner rooms appear

Inner rooms are common in small and altered premises, especially where rooms have been added or layouts have changed over time.

Examples include:

• A stockroom accessed only through a shop floor
• A rear office accessed only through a workshop
• A treatment room accessed only through another treatment room
• A staff room accessed only through a kitchen
• A small store accessed only through a workroom
• A basement room where the only exit route passes through another risk area

Some of these may be low risk. Others may need changes or professional review, depending on the layout, fire hazards and who uses the room.

When an inner room may be lower risk

An inner room arrangement may be less concerning where the room is small, low risk and used only occasionally.

For example:

• The inner room is used by staff only
• People are awake and familiar with the building
• The access room is low fire risk
• There is no sleeping accommodation
• There are no vulnerable occupants
• The travel distance is short
• There is suitable fire detection or early warning
• The access route is kept clear

Even then, the arrangement should still be recorded in the fire risk assessment and reviewed sensibly.

If your premises is simple and low risk, our online fire risk assessment can help you record escape route issues and create a structured action plan.

When an inner room is more serious

You should be more cautious if the inner room arrangement could delay escape or leave someone trapped.

Get professional advice if:

• The inner room is regularly occupied
• The inner room is used by members of the public
• The access room contains higher fire hazards
• The access room is a kitchen, workshop, plant room or storage area
• There is only one escape route
• People in the inner room may not notice a fire quickly
• The route is long, narrow, locked, cluttered or confusing
• There is sleeping accommodation
• Vulnerable people use the premises
• There is no suitable fire detection or alarm

In these situations, a simple self-assessment may not be enough. You may need a competent fire risk assessor to review the layout.

You can read more in our guide: When to Use a Professional Fire Risk Assessor.

What should you check in a low-risk premises?

If you are completing a low-risk fire risk assessment, look at each room and ask:

• Can someone leave this room without passing through another working room?
• Does the route lead to a corridor, hallway, staircase or final exit?
• Could a fire in the access room block the only way out?
• Would someone in the inner room know about a fire quickly?
• Is the access route clear and easy to use?
• Are exit doors easy to open?
• Is there enough lighting, including emergency lighting where needed?
• Are staff familiar with the escape route?

GOV.UK’s fire safety checklist also highlights practical checks such as keeping exit routes clear, making sure fire exits are easily openable, and maintaining emergency escape lighting where required. Read the GOV.UK fire risk assessment checklist.

What actions might be needed?

The right action depends on the layout and level of risk. Do not make building changes without understanding the wider fire strategy, especially in larger or more complex premises.

Possible actions may include:

• Keeping the access room clear of combustible storage
• Improving housekeeping along the escape route
• Adding or improving fire detection
• Making sure staff understand the escape route
• Keeping doors unlocked and easy to open when occupied
• Adding signage where appropriate
• Reviewing emergency lighting
• Changing how the room is used
• Restricting use of the inner room
• Getting professional advice on layout changes

For low-risk premises, small management actions may be enough. For anything involving layout, doors, alarms, compartmentation or escape design, professional advice is sensible.

How to answer an inner room question in a fire risk assessment

If your fire risk assessment asks whether there are inner rooms, answer “Yes” only where someone must escape through another room, rather than directly into a corridor, hallway, lobby, staircase or final exit route.

Answer “No” where rooms open onto normal escape routes, such as corridors or hallways, and people do not need to pass through another working room to get out.

If you are not sure, record the uncertainty and get competent advice before relying on the assessment.

When to use a professional assessor

Use a professional fire risk assessor if the escape arrangement is not straightforward or if people could be placed at risk if the access room is affected by fire.

This is especially important where:

• The building is large or complex
• There is sleeping accommodation
• The public use the premises
• Vulnerable people may be present
• The access room contains higher fire hazards
• There are fire door, alarm or emergency lighting concerns
• You are unsure whether the escape route is acceptable

A guided online assessment is best suited to simple, low-risk premises. It should not be used to justify a complex or uncertain escape arrangement.

Complete a fire risk assessment online

If your premises is simple and low risk, our guided fire risk assessment tool helps you review key areas such as escape routes, fire exits, fire detection, extinguishers, housekeeping and action planning.

You can start an online fire risk assessment here.

Quick checklist: inner rooms and escape routes

Lower-risk signs

• The room opens onto a normal corridor, hallway or final exit route
• The route is short and clear
• The premises is simple and low risk
• People are awake, familiar with the building and able to escape unaided
• The access area has low fire hazards
• There is suitable fire detection or early warning

Higher-risk signs

• The only way out is through another working room
• The access room contains cooking, plant, storage or workshop hazards
• The inner room is regularly occupied
• Members of the public or vulnerable people use the inner room
• There is sleeping accommodation
• The escape route is long, locked, cluttered or unclear
• You are not confident judging whether the arrangement is safe

Frequently asked questions

Is an inner room automatically unsafe?

No. An inner room is not automatically unsafe, but it does need to be considered carefully. The risk depends on how the room is used, the hazards in the access room, the escape distance, the people present and whether there is suitable early warning.

Does a room off a corridor count as an inner room?

Usually no. A room opening onto a normal corridor, hallway, lobby, staircase or final exit route is different from a room where the only way out is through another working room.

What if a stockroom is only accessed through the shop?

It may be an inner room arrangement. If the stockroom is small, staff-only and low risk, it may be manageable. If it is regularly occupied, contains combustible storage, or escape could be blocked by a fire in the shop, you should review it carefully and consider professional advice.

Can I complete my own fire risk assessment if I have an inner room?

Possibly, if the premises is simple, low risk and you are competent to judge the escape arrangement. If the layout is complex, the room is regularly occupied, or you are unsure, use a professional fire risk assessor.

What should I record in the assessment?

Record where the inner room is, how it is used, who uses it, how people escape, whether the access route is clear, whether there is suitable early warning, and any action needed to reduce the risk.