Fire Door Closers Explained: Types, Problems and Adjustment

Does every fire door need a self-closer?

Almost every fire door in use needs one. Approved Document B expects fire doors to be self-closing, with the main exception being cupboard and riser doors that are kept locked shut.

A fire door only works when it is closed. That is why the closer matters as much as the door itself. In blocks of flats the Fire Safety (England) Regulations 2022 also require residents to be told not to tamper with self-closers on their flat entrance doors.

In HMOs, most councils follow the LACORS housing fire safety guidance. It usually expects self-closing fire doors on rooms that open onto the escape route, though some small, lower-risk shared houses of up to two storeys may need less. Check the council's HMO standards and the fire risk assessment. See fire doors for HMOs.

What power size closer does a fire door need?

Power size 3 is the minimum for a fire door under BS EN 1154. Sizes 1 and 2 are too weak to close a fire door reliably against its seals and latch.

The power size depends mainly on the width and weight of the leaf. Wide or heavy doors, and doors on windy or draughty landings, often need size 4 or more. An undersized closer is one of the most common reasons a door will not latch.

Look for the CE or UKCA mark and the BS EN 1154 classification on the closer body. If there is no marking, the closer cannot be confirmed as suitable for a fire door.

Which type of fire door closer is best?

For most fire doors an overhead surface-mounted closer is the most reliable choice, because it is strong, adjustable and easy to inspect.

The right choice depends on who uses the door and how often. A flat entrance door used by an elderly resident may suit a free-swing closer. A busy school corridor may suit hold-open devices linked to the fire alarm.

Why won't my fire door close or latch properly?

Most doors that will not latch have a closer set too weak, seals or hinges dragging, or a latch out of line with its keep. Few closers are actually broken.

Self-closers that were missing, not closing the door fully or leaking oil came up on 13% of 448 doors in our inspections. In one hotel, 12 escape-route doors had no self-closer at all. The figures are on our fire door inspection statistics page.

An unlatched fire door can be pushed open by the pressure of a fire, so a door that closes but does not latch still fails.

• Latch action too weak: the door slows down and stops just short of the frame.
• New seals: fresh smoke seals add friction and can stop a door that closed fine before.
• Dropped hinges: the leaf catches the frame or the floor.
• Latch and keep out of line: the door touches the frame but does not catch.
• Undersized closer: a size 2 or weak size 3 on a heavy door.
• Leaking closer: oil on the floor or the closer body means it needs replacing.

How do you adjust a fire door closer?

Most closers have two valves: one for sweep speed and one for latch action. Small turns, a quarter at a time, fix most slamming or hanging doors in about ten minutes.

A slamming door needs the sweep slowed, while keeping enough latch action to pull it onto the latch. A door that hangs open needs more latch action, unless the real cause is a binding seal or a dropped hinge. After any adjustment, open the door fully and let go, then open it to about 15 degrees and let go. It should latch both times.

Approved Document M says the force needed to open a door should be no more than 30 newtons at the leading edge in the first part of its swing. If residents say a door is too heavy, adjust it or fit a free-swing closer. Disconnecting the closer is never the answer.

Can a fire door closer be held open?

Yes, but only with a device that releases automatically when the fire alarm sounds, such as a hold-open magnet or free-swing closer to BS EN 1155. Wedges and hooks are not acceptable.

These devices need a working fire alarm and should be tested regularly. On the release test, use the test button or the alarm, not a pull on the door. Our guide can fire doors be held open? covers the options in more detail.

What does a new fire door closer cost?

A new overhead closer fitted typically costs £100 to £250 + VAT, depending on the closer and the door. Adjustment alone is usually part of a wider repair visit.

Repairs usually cost £150 to £900 a door + VAT, depending on the fault and how many doors are done on one visit. Free-swing and hold-open devices cost more because they need wiring to the fire alarm. See fire door repairs and fire door remedial costs.

We inspect and repair fire doors across Bedfordshire, Hertfordshire, London, the Thames Valley and the East Midlands.

Sources

• GOV.UK: Fire Safety (England) Regulations 2022, fire door guidance (updated 8 August 2025)
• Approved Document B: Fire safety
• Approved Document M: Access to and use of buildings
• BS EN 1154 closer coding explained (Fire Safe)
• Regulatory Reform (Fire Safety) Order 2005
• LACORS: Housing fire safety guidance
• DC Fire & Security: fire door inspection statistics

Updated October 2026 by Sebastian Grabowski, DC Fire & Security. We inspect and repair fire doors across Bedfordshire, Hertfordshire, London, the Thames Valley and the East Midlands. Our own figures: fire door inspection statistics 2026.