Fire doors save lives. They also protect property and satisfy insurance requirements. Choosing the right fire rated office doors is not optional for commercial landlords. It is a legal duty under the Regulatory Reform (Fire Safety) Order 2005.
This guide explains exactly what to look for. It covers ratings, certification, installation, and common mistakes. For property owners in London and the South East, this is essential reading.
Understanding Fire Door Ratings
Fire doors are tested to withstand flames for a specific period. The two most common ratings are FD30 and FD60.
- FD30 doors resist fire for 30 minutes.
- FD60 doors resist fire for 60 minutes.
The rating determines where each door can be used. FD30 and FD60 fire doors for offices are tested in special furnaces where temperatures reach over 800 degrees Celsius. The door must remain intact, must not allow flames to pass through, and must not develop gaps around the edges. Every certified door carries a label proving it has passed these tests.
For most office corridors and standard escape routes, FD30 is sufficient. For doors between building compartments or near high risk areas, FD60 is required. A fire risk assessment will specify the rating needed for each location. Do not guess. Get a professional assessment.
Why Fire Door Ratings Matter for Compliance
UK building regulations are clear. Approved Document B covers fire safety. It states that fire doors must be installed in specific locations:
- Any door on an escape route
- Any door between different tenancies
- Any door protecting a stairwell or lobby
Using unrated doors in these locations is a criminal offence. The responsible person — usually the landlord or building owner — faces unlimited fines and potential imprisonment. Insurance companies also refuse claims when non-compliant doors are found after a fire.
Fire rated office doors from certified manufacturers provide legal protection. They come with traceable documentation. Every door has a unique identification number linked to its test report. This paper trail proves compliance during inspections.
How to Identify a Compliant Fire Door
Not every door that looks solid is fire rated. There are five key things to check.
1. The Certification Label
A genuine fire door has a manufacturer label — usually on the top edge or the side of the door leaf. The label shows the FD rating, the standard tested to, and a batch number. Do not accept a door without a label.
2. The Door Thickness
Most fire rated doors are 44mm thick. Standard domestic doors are 35mm. Thicker doors have more core material to resist heat penetration.
3. The Intumescent Seals
These are strips set into the door frame or the door edge. They expand when heated and block gaps around the door. Without seals, smoke and flames pass through within minutes.
4. The Hinges
Fire doors require three certified hinges. Each hinge must be fully intact with no missing screws. Domestic hinges fail under fire conditions.
5. The Gap Size
The gap between the door and the frame must be between 2mm and 4mm. A 3mm gap is ideal. Larger gaps let smoke through. Smaller gaps cause the door to stick.
Common Mistakes in Fire Door Installation
Mistake One: Using Non-Rated Doors in Rated Positions
The door looks similar. The cost is lower. But the performance is zero. Fire door installation must use the correct product.
Mistake Two: Fitting the Wrong Hardware
Standard handles melt. Standard hinges fail. Standard letter boxes create holes. Every component on a fire door must be fire rated — including handles, hinges, closers, locks, and signage.
Mistake Three: Trimming the Door
A fire door is factory made to exact dimensions. Cutting even 5mm from the bottom removes the intumescent seal groove, reduces the thickness, and voids the certification.
Mistake Four: Poor Frame Installation
A fire door is only as good as its frame. The frame must be fire rated too. It must be fixed to masonry or steel with approved fixings at the correct spacing.
Modern office door sets in South East are a smarter solution. A door set includes the door leaf, the frame, all seals, and all ironmongery — everything from one manufacturer, tested together. Installation is straightforward. Compliance is guaranteed.
The Installation Process for Fire Doors
Proper fire door installation follows a strict sequence:
- The existing door and frame are removed. The opening is checked for square and plumb.
- The new fire rated frame is installed. Fixing points are every 400mm.
- The door leaf is hung on three certified hinges.
- The intumescent seals are fitted into the groove.
- The door closer is installed and adjusted.
- The signage is fixed at the correct height.
After installation, every door is tested. The gap is measured with a feeler gauge. The closer is checked for slow and smooth operation. The latch engages fully. The certification label is photographed for records.
Fleet Office Interiors provides a full certification pack after every fire door installation. This includes photographs of each door, gap measurements, seal certificates, hinge specifications, and ironmongery listings. Building control accepts this pack as proof of compliance.
Maintaining Fire Doors Over Time
Fire doors are not fit and forget. They need regular inspection. The Regulatory Reform Order requires the responsible person to check fire doors at least every six months. Some buildings need more frequent checks.
Look for these signs of damage:
- Chipped edges that expose the core
- Worn or missing intumescent seals
- Loose hinges with missing screws
- Doors that do not close fully
- Altered or removed signage
Any damage requires immediate repair or replacement. FD30 and FD60 fire doors for offices can last for decades with proper maintenance — but one incorrect alteration ruins them. Painting a fire door is allowed. Adding a new lock without certification is not. Always consult a specialist before modifying any fire door.
Why Choose Fleet for Fire Door Installation
Fleet Office Interiors has installed thousands of fire rated office doors across London and the South East. The team holds current certificates for fire door installation. Every installer carries gap gauges and seal kits. No subcontractors. No shortcuts.
Fleet supplies modern office door sets in South East from leading UK manufacturers — white primed, oak veneer, grey foil, and glass panels. Each set arrives complete with frame, seals, hinges, handles, closer, and signage.
Fire door installation by Fleet includes full certification: photographs, measurements, traceable labels, and a complete compliance pack for your building file. Insurance approved. Building control approved.
Protect Your Building with Compliant Fire Doors
Choosing the right fire rated office doors protects lives, property, and legal compliance. Check the label. Check the thickness. Check the seals. Never trim a fire door. Use certified installers.
Fleet Office Interiors delivers complete door sets with full certification. 44+ years of experience. One team. One warranty.
Call Fleet today for a free fire door survey across London and the South East.