FD30 provides 30 minutes of fire resistance and is the standard for flat entrance doors and residential escape routes. FD60 provides 60 minutes and is used where higher fire loads or stricter compartmentation apply, such as protected stairwells and plant rooms.
The “FD” in FD30 and FD60 stands for “fire door”, while the number shows the minimum time the certified doorset has been tested to resist fire under standardised UK conditions. That rating is only part of the decision. Where the fire door will be installed determines whether an FD30 or FD60 fire door is the appropriate choice.
Key Takeaways
- FD30 provides a minimum of 30 minutes of fire resistance; FD60 provides a minimum of 60 minutes.
- FD30S (with smoke seals) is the standard specification for most flat entrance doors, and both ratings are tested to BS EN 1634-1 with requirements set out in Approved Document B.
- Correct installation and ongoing maintenance matter just as much as the certified rating (a large share of inspected fire doors fail due to defects rather than the door’s classification).
What Is an FD30 Fire Door?
An FD30 fire door is a certified fire doorset designed to slow the spread of fire and smoke for a minimum of 30 minutes. By helping to contain a fire within one part of a building, it provides valuable time for occupants to evacuate and for emergency services to respond. It is one element of a wider fire protection strategy rather than a standalone safety measure.
FD30 is the most commonly specified fire door rating in the UK. You will typically find it on flat entrance doors, within communal areas of residential buildings, and throughout offices, schools and hotels.
It is also widely used along protected escape routes and in other parts of a building. These are locations where a 30-minute fire resistance period is considered appropriate for the building’s overall fire safety design.
How Long Does an FD30 Fire Door Provide Protection?
The 30-minute rating does not mean a fire door will fail as soon as the clock reaches 30 minutes. It means the certified doorset has demonstrated that it can continue meeting the required fire resistance performance for at least that long under controlled fire test conditions.
Actual performance during a real fire can vary depending on factors such as the fire’s intensity, the condition of the doorset and whether it has been installed and maintained correctly.
To achieve an FD30 classification, the complete doorset is tested as a single assembly to BS EN 1634-1. That certification only applies to the tested specification, so replacing components or carrying out poor quality repairs can affect the doorset’s fire resisting performance.
What Is an FD60 Fire Door?
An FD60 fire door is a certified fire doorset designed to resist the spread of fire and smoke for at least 60 minutes. It provides a higher level of fire protection than an FD30 doorset and is typically specified where a longer period of containment is needed.
Rather than replacing FD30 fire doors, it is used in parts of a building where the fire risk, occupancy or evacuation strategy calls for additional protection. You are most likely to find FD60 fire doors in:
- Protected stairwells
- Plant rooms
- Boiler rooms
- Service risers
- Firefighting shafts
- Higher-risk areas.
They are also used in buildings where maintaining compartmentation for longer is an important part of the overall fire safety strategy.
An FD60 door should only be specified where the building requires that higher level of fire resistance.
How Long Does an FD60 Fire Door Provide Protection?
The 60-minute rating is a certified minimum performance achieved under controlled fire test conditions. It does not mean a fire door will automatically fail after one hour. Instead, it confirms that the tested doorset continued to meet the required fire resistance performance for at least 60 minutes during testing.
As with any certified fire door, that classification only applies to the tested doorset.
Altering the specification, replacing approved components with non-compatible alternatives or carrying out poor-quality installation or repairs can affect its certified performance.
FD30 vs FD60 Fire Doors (Key Differences)
When people compare FD30 and FD60, the question is rarely about which door looks better. It comes down to the specific location of the door, what the building is used for, and the level of fire resistance that location legally demands.
Both ratings apply to the complete certified doorset, not only the door leaf. Also, both rely on every component being correctly installed and compatible with the tested assembly.
It is also worth noting that FD60 doors generally cost more due to their more robust construction, so a project-specific quotation will give you the most accurate figure.
Should You Choose an FD30 or FD60 Fire Door?
You can choose either an FD30 or FD60 fire door, but only if it is suitable for the location where it will be installed. The correct rating is generally set by a combination of building regulations, the building’s layout and use, and the findings of a fire risk assessment.
That said, understanding which rating tends to apply where will help you ask the right questions.
Residential Properties
For most standard houses and flats, FD30 is sufficient for internal fire doors and entrance doors. Unless a fire risk assessment identifies a specific reason to go higher, FD30S is the typical requirement.
Flats and Apartment Buildings
Flat entrance doors sit at the dividing line between a private flat and a shared communal escape route. That position makes them particularly important. If a fire starts in one flat, the entrance door is what keeps it contained while residents in the corridor can get out safely.
FD30S is the standard specification for these doors. Both fire resistance and smoke control are critical in this location. Landlords, managing agents and Responsible Persons for blocks of flats have legal duties under the Fire Safety (England) Regulations fire door guidance. These include checking, maintaining and replacing fire doors that are found to be non compliant.
For buildings over 11 metres, communal fire doors must be checked at least every three months, and flat entrance doors must be checked at least once a year.
HMOs
Houses in Multiple Occupation require fire doors on escape routes and between certain rooms. But the exact specification depends on the property’s fire risk assessment and the licensing conditions set by the local authority. FD30S is common, though a higher rating may be required depending on the layout and risk level.
Commercial Buildings
Commercial buildings often need a mix of FD30 and FD60 fire doors, depending on the layout, the number of occupants and the findings of the fire risk assessment. Building regulations set minimum fire door requirements for different parts of commercial buildings.
For example, a single office floor might only need FD30 doors, while the plant room in the same building may require FD60.
Plant Rooms and High-Risk Areas
Plant rooms, boiler rooms and service risers contain equipment that can fuel a fire quickly. FD60 is commonly required in these areas because the higher fire load means a 30-minute door may not provide enough time for safe evacuation or fire service intervention.
Are FD30 and FD60 Fire Doors a Legal Requirement?
Yes, but only where they are required by law. The required fire door rating depends on the building and its intended use. Building owners and managers must ensure the correct fire doors are installed and maintained to remain compliant.
Building Regulations
The Building Regulations decide whether a building needs an FD30 or FD60 fire door. They do not require the same fire door rating everywhere. Instead, the required rating depends on where the door is located, how the building is used and how long that area needs to resist the spread of fire.
The official guidance is set out in Approved Document B. It explains the minimum fire resistance expected for different parts of residential and commercial buildings. For example, a flat entrance door may require a different fire rating from a plant room or a protected stairwell.
Rather than choosing the highest fire rating available, the correct approach is to install the rating specified for that location so the building’s fire safety measures work as intended.
Fire Risk Assessments
Building regulations provide the baseline, but a fire risk assessment fills in the detail for a specific property. The assessment looks at how the building is actually used, where people sleep or work, and how quickly an evacuation could realistically be carried out. It may result in a higher specification than the minimum set out in Approved Document B.
Fire Compartmentation
Fire doors do not work in isolation. They are part of a building’s overall compartmentation strategy, working together with walls, floors and ceilings to stop fire from spreading between sections of a building.
This matters a great deal in residential settings. In the year ending December 2025, dwelling fires accounted for 71% of all fire-related fatalities in England, which is 201 deaths. Compartmentation, including properly installed and maintained fire doors, is one of the most effective ways to reduce that number.
The fire door legal maintenance duties outlined by the Fire Door Inspection Scheme make clear that this is an ongoing legal obligation, not a one-off box-ticking exercise.
Can an FD30 Fire Door Be Replaced with an FD60 Fire Door?
Yes, upgrading from FD30 to FD60 is generally possible, but it is not as simple as swapping the door leaf. The FD60 rating belongs to the complete tested doorset, so the frame, seals and ironmongery all need to be compatible with the certified FD60 assembly. In most cases, a full doorset replacement is required.
This decision should always be guided by the building’s fire risk assessment and Approved Document B, rather than done on a whim. Upgrading without proper guidance could create gaps in your overall compartmentation strategy or result in non-compliant work.
Why Professional Fire Door Installation Matters
A fire door’s certified rating means nothing if it has not been fitted correctly. Fire doors are designed to help keep fire contained within separate parts of a building and protect escape routes, but they can only do that if the complete doorset performs as tested. The gap around the frame, the condition of the smoke seals and the way the self closer operates all affect whether the door will work when it matters.
The numbers from the Fire Door Inspection Scheme (FDIS) are stark. In 2025, 72% of fire doors inspected across the UK did not meet the required standard. The most common faults were excessive gaps around the door, smoke sealing failures and general maintenance defects. Notably, 70% of those non compliant doors only needed minor remedial work to bring them up to standard.
A BRE report found installation and maintenance defects serious enough that it could not confirm some certified fire doors would still achieve their expected 30 minute fire resistance. This highlights an important point. Certification alone is not enough. A fire door must also be installed, inspected and maintained correctly throughout its service life.
The certified rating on the label is only the starting point. Proper installation is what allows the doorset to perform as intended in a fire. If you want a fire door that works as tested, our fire doors supply, installation and quote service ensures everything is fitted to the required standard from day one.
FAQs
Is an FD60 fire door better than an FD30 fire door?
No. FD60 is only better where a 60-minute fire rating is required. Otherwise, an FD30 fire door is the correct choice.
Do flats require FD30 or FD60 fire doors?
Most flat entrance doors require FD30S fire doors. Other parts of the building may require FD60, depending on the fire safety requirements.
What is the difference between FD30 and FD30S?
FD30S includes smoke seals in addition to the fire resistance. The “S” confirms that the doorset has also been tested for smoke control, which is the standard requirement for flat entrance doors.
Can you trim a fire door?
Yes, but only within the manufacturer’s permitted limits. Trimming beyond those limits can invalidate the fire door’s certification.
Can you upgrade an FD30 fire door to FD60?
Not by modifying the existing door. An FD60 rating requires a fully tested FD60 doorset, including a compatible frame, seals and hardware.
Conclusion
FD30 and FD60 fire doors are designed for different levels of fire protection, and the correct rating depends on where the doorset is installed. Correct installation and regular maintenance are just as important as selecting the right fire door.
If you are unsure whether your property needs FD30 or FD60 fire doors, we can carry out a professional survey and provide a quote tailored to your building’s requirements.
Get in touch for a free quote today.
