Fire Door Signs: Keep Shut or Keep Locked?

A fire door sign can give a clear instruction in seconds, but the wording matters. Fire door signs reading “Keep Shut” and “Keep Locked” apply to different doors and different fire safety arrangements.

Using the wrong mandatory signage can confuse staff, visitors, and contractors. It may also suggest that a fire door is being managed incorrectly. The difference becomes clear once you look at how the door operates, where it leads, and what your fire risk assessment requires.

Key Takeaways

• A fire door keep shut sign applies to a self-closing fire door that must remain closed during normal use.
• A fire door keep locked sign applies to doors that must stay locked, often plant rooms and other higher-risk service areas.
• Keep-shut signs normally belong on both sides of the door, while keep-locked signs are generally fixed to the external face.
• A sign doesn’t replace a working door closer, suitable fire-resisting construction, regular inspections, or a clear evacuation plan.
• The responsible person should choose signage after reviewing the building’s fire risk assessment.

What Fire Door Signs Mean in Practice

Fire doors divide a building into fire-resistant compartments. When closed, they can slow the movement of flames and smoke, giving people more time to leave and allowing firefighters to work more safely.

A fire safety sign tells people how to use that door. It doesn’t improve the door’s fire rating, repair damage, or make an unsuitable lock compliant. The notice works alongside the door hardware and the building’s fire safety procedures.

FIRE DOOR KEEP SHUT is used for a self-closing fire door that people may open during normal movement around the building. The door must close after use, so the closer needs to operate correctly and the leaf must meet the frame without obstruction.

FIRE DOOR KEEP LOCKED gives a different instruction. It tells authorised staff that the door must remain locked when access isn’t required. This wording often appears on plant room doors, service cupboards, electrical rooms, and other areas where equipment or stored materials may add to fire risk.

The terms shouldn’t be swapped for convenience. A locked plant room door may need a fire door keep locked sign, while a corridor door used by staff may need a fire door keep shut sign. The building’s fire strategy should decide the arrangement.

The sign should match the door’s intended use and the fire risk assessment.

UK fire safety signage draws on several sources rather than one single sign law. Health and safety regulations, including the Health and Safety (Safety Signs and Signals) Regulations 1996, alongside BS 5499 guidance and BS EN ISO 7010, all influence the design and use of safety notices. You can also compare the two common wordings in this guide to fire door signage, which aligns with broader fire safety regulations.

Keep Shut or Keep Locked: Which Sign Do You Need?

The easiest way to choose is to ask what happens after someone uses the door.

Sign wording	Typical door or location	Main instruction	Usual position
FIRE DOOR KEEP SHUT	Self-closing door on a corridor, stairwell, or compartment boundary	Allow the door to close fully after passage	Both sides of the door
FIRE DOOR KEEP LOCKED	Plant room, service room, or other restricted fire-risk area	Keep the door locked when unauthorised access isn’t needed	External face of the door

A keep-shut sign doesn’t mean that people must never open the door. Staff may pass through it, provided they don’t wedge it open and allow it to close immediately afterwards. If the door needs to stay open for access, install an approved hold-open or release device designed for the fire alarm system. A hook, wedge, bin, or piece of timber isn’t a safe substitute. For automated entrances, an automatic fire door keep clear notice ensures that people do not obstruct the operating arc of the panels.

The sign is especially important on self-closing doors that people regularly prop open. This happens in offices, warehouses, schools, care settings, and retail premises when staff want easier access. However, an open fire door cannot perform its compartmentation role properly.

A keep-locked sign has a narrower purpose. It usually appears where everyday access isn’t needed and where the contents or activities behind the door could increase the danger of fire. The door should still allow lawful escape where the fire strategy requires it. A lock must never create a dangerous obstruction on an escape route.

The wording also needs to match the access control system. Keypads, electronic locks, magnetic retainers, and automatic operators require a competent review. When dealing with an escape route, hardware such as an emergency door release or a simple push bar to open mechanism must function reliably. A sign cannot correct a lock that prevents escape or releases incorrectly during an alarm.

Where Should Fire Door Signs Be Fitted?

Visibility matters because people need to read the instruction before they use the door. Guidance commonly places signs at eye level, often around 1.5 to 2 metres above the finished floor, making proper signage height essential for compliance. The exact position depends on the door design and the mounting surface.

For a self-closing fire door, fit the keep-shut notice on both faces. Someone approaching from either side should see the instruction. On a plant room or similar restricted door, the keep-locked sign normally goes on the outside, where it addresses the person trying to enter.

Keep the notice clear of door handles, vision panels, panic hardware, glazing, and frame edges. Do not position it where an open door, furniture, stock, or a temporary display will hide it. A damaged or peeling notice should be replaced rather than left in place.

The colour and layout should follow suitable safety sign guidance. Mandatory signage commonly uses a blue background with white text or symbols, which may sometimes be paired with related prohibition signs or warning signs depending on the specific hazards of the area. Fire door notices should use short, direct wording that can be understood quickly.

Some older buildings still have text-only notices. Existing signs may remain acceptable in certain settings, but missing or damaged signs should be replaced with the format selected for the current fire safety arrangements. Avoid mixing different styles across the same door set because inconsistent notices can create doubt.

A sign also needs to suit the environment. Kitchens, workshops, loading bays, and external plant areas may need hard-wearing, moisture-resistant, or high-visibility materials. In environments with low lighting or emergency escape routes, photoluminescent signs are often utilized so they remain visible in the dark. For a busy industrial site, a small paper label will not last long or remain readable.

How to Check the Door Beyond the Sign

A correctly worded notice is only one part of fire door management. The responsible person should check the whole door set during routine inspections and record faults for repair to maintain proper fire safety across all commercial premises.

Look for:

• A door leaf that closes fully into the frame without sticking.
• A working self-closing device with no signs of damage or tampering.
• Intact hinges, seals, glazing, handles, and locks.
• No excessive gaps, impact damage, missing screws, or damaged edges.
• Clear access around both sides of the door to ensure safe building evacuation.
• A sign that is readable, secure, and positioned where users can see it.
• No wedges, hooks, bins, or other items holding the door open.

A failed closer is a common reason for a keep-shut door to remain open. Misalignment, worn hinges, a damaged frame, or a faulty latch can cause the same problem. Staff may then prop the door open because it feels difficult to use.

The regulatory reform fire safety order places duties on the responsible person to manage fire safety in relevant non-domestic premises. Signage should form part of the fire risk assessment, not a separate decoration exercise.

In England, the Fire Safety (England) Regulations 2022 also give residents clear guidance that fire doors should stay shut when not in use and that faults should be reported. Other parts of the UK operate under their own arrangements, so building owners should follow the requirements that apply to their location.

Fire Doors, Security Doors, and Shutters

Commercial premises often contain several door types, and each one needs a clear role. A fire exit door may provide escape, security, and controlled access, while emergency exits ensure safe evacuation routes across the building. A fire-rated roller shutter may protect an opening between compartments, and a steel personnel door may secure a plant room or service area.

These products shouldn’t receive the same sign automatically. A fire-resistant roller shutter, for example, may close through an alarm interface or fusible link rather than a standard self-closing arm. Its signage, operating instructions, and inspection routine should match the manufacturer’s instructions and the site’s fire strategy.

UK Doors & Shutters supplies and installs compliant fire exit doors for commercial and industrial premises. A site survey can identify whether the door needs improved hardware, clear fire exit signs, access control, closer adjustment, replacement signage, or wider repair work.

The same approach applies when a door connects to a busy warehouse or loading area. High-speed doors, roller shutters, crash doors, and pedestrian fire doors may work together, but they don’t all have the same fire function. Clear identification helps staff use each system correctly.

If a fire door won’t close, has suffered impact damage, or has a faulty lock, isolate the problem and arrange a competent inspection. For installation, repair, or maintenance support, Contact Us to discuss the door or shutter system at your premises.

A Practical Signage Review for Facilities Managers

Start by walking every fire-resisting door route during normal working hours. While checking these doors, facilities managers should also audit broader safety information, including the position of every fire action notice, the clarity of fire assembly points, the visibility of fire alarm call points, and the proper labeling for fire fighting equipment and fire extinguisher signs. Note which doors people use frequently, which doors lead to restricted rooms, and where staff have added wedges or temporary notices.

Next, compare each sign with the door’s intended operation. A self-closing corridor door usually needs a keep shut label. A locked plant room usually needs a keep locked label. If the answer isn’t clear, ask the fire risk assessor, door manufacturer, or competent installer to review it.

Then inspect the physical condition of each door. A new sign won’t solve a door that drags across the floor or fails to latch. Record the fault, identify who will fix it, and check the repair after completion.

Finally, explain the instruction to employees and contractors. People often prop doors open for deliveries, ventilation, or convenience without understanding the effect on fire separation. Short toolbox talks and visible signs can prevent that behavior, but managers must also deal with the underlying access problem.

Frequently Asked Questions

What is the difference between a Fire Door Keep Shut sign and a Fire Door Keep Locked sign?

A keep shut sign is used on self-closing fire doors that people use during normal movement around the building and must remain closed when not in use. A keep locked sign is placed on restricted service areas, such as plant rooms or electrical cupboards, which must stay locked to prevent unauthorised access.

Should fire door signs be fitted to both sides of the door?

A Fire Door Keep Shut sign should normally be fitted to both faces of the door so it is clearly visible to anyone approaching from either side. In contrast, a Fire Door Keep Locked sign is generally fixed only to the external face of the door where it addresses individuals attempting to enter.

Can I use a wedge or hook to hold open a fire door with a Keep Shut sign?

No, wedges, timber, or hooks must never be used to hold open a fire door, as an open door cannot slow the movement of smoke and flames during a fire. If a door needs to remain open for daily access, you should install an approved automatic release device linked to the building’s fire alarm system.

Conclusion

Keep shut and keep locked signs give different instructions, so choosing between them requires more than matching a label to a fire door. Keep shut notices suit self closing doors in regular use, while keep locked notices suit restricted areas that must remain secured.

Good fire door signs should be visible, correctly positioned, and supported by working hardware and regular checks as part of your overall fire safety management. When the sign, door, lock, and fire risk assessment all agree, people receive a clear instruction regarding fire safety signs and escape routes when it matters most.