Types of Fire Doors: Ratings, Materials and How to Choose the Right One
Fire doors play a critical role in protecting lives and property in UK homes and commercial buildings. With over 34,000 dwelling fires occurring in the UK each year, choosing the right fire door is not just a design decision; it is a safety one. According to the Home Office, there were 233 fire-related fatalities in 220 fatal fires in England in the year ending June 2024.
Fire doors come in different ratings, materials, and designs. Selecting the wrong type can compromise safety and put occupants at risk. This guide covers everything from what a fire door is, FD ratings, material choices, and how to pick the right fire door for any building. Read on to find out which fire door type suits your property.
What is a Fire Door and Why Does it Matter?
A fire door is a specially engineered door designed to resist the spread of fire and smoke between compartments of a building for a set period, typically 30 to 120 minutes. It forms a key part of a building's passive fire protection system.
Fire doors work by compartmentalising fire, slowing its spread, and protecting escape routes such as corridors and stairwells. The key components that make a fire door effective include the door leaf, a fire-rated frame, intumescent seals (which expand under heat to seal gaps), smoke seals, self-closing devices, and fire-rated hinges.
A regular door offers no tested fire resistance. A fire door, on the other hand, has been furnace-tested and certified to withstand fire for a rated duration. This is why fire doors are required by building regulations in specific locations within residential and commercial properties.
Fire Door Types by Rating
Fire doors are classified by their fire resistance duration, measured in minutes. The rating indicates how long the door can hold back fire and smoke during a furnace test conducted under BS 476 Part 22 or BS EN 1634-1.
FD30 Fire Doors
FD30 doors provide 30 minutes of fire resistance and are the most common rating in the UK. They are typically 44mm thick. FD30 fire doors are used in residential flats (between the flat entrance and communal areas), loft conversions, rooms leading to internal stairwells in homes above two storeys, and low-risk commercial spaces like small offices.
FD60 Fire Doors
FD60 doors provide 60 minutes of fire resistance and are usually 54mm thick. They are used in larger commercial buildings, schools, hospitals, hotels, and areas with higher occupancy or longer evacuation times. If a building has a higher fire risk or more people to evacuate, FD60 is often the minimum requirement.
FD90 and FD120 Fire Doors
FD90 doors offer 90 minutes of fire resistance and are typically 64mm thick. FD120 doors offer 120 minutes. These are used in high-risk environments such as industrial facilities, warehouses storing flammable materials, deep basements, and critical infrastructure like data centres and power plants. FD240, the highest available rating (up to 4 hours), is reserved for extreme environments where maximum fire containment is essential.
The table below summarises the key fire door ratings, their resistance duration, typical thickness, and common applications.
| Rating | Fire Resistance | Typical Thickness | Common Applications |
|---|---|---|---|
| FD30 | 30 minutes | 44mm | Residential flats, loft conversions, small offices |
| FD60 | 60 minutes | 54mm | Schools, hospitals, hotels, larger commercial buildings |
| FD90 | 90 minutes | 64mm | Industrial facilities, deep basements, warehouses |
| FD120 | 120 minutes | 64mm+ | Data centres, power plants, critical infrastructure |
| FD240 | 240 minutes (4 hours) | Varies | Extreme high-risk environments |
Fire Door Types by Material
In addition to the fire rating, the material of a fire door determines its durability, appearance, weight, and suitability for different environments.
Timber Fire Doors
Timber fire doors are the most common type in the UK, used widely in residential and commercial settings. They are constructed using a solid timber or particleboard core, often with MDF or plywood facings. Timber fire doors can be finished with veneers such as oak, walnut, or white primed to match your interior decor. They are available in ratings from FD30 to FD120 and suit homes, offices, flats, and corridors.
Steel Fire Doors
Steel fire doors are built with a steel core and fire-resistant infill materials, making them highly durable and capable of withstanding intense heat. They can achieve ratings up to FD240 (4 hours). Steel fire doors are commonly used in industrial facilities, warehouses, commercial kitchens, hospitals, high-security areas, and high-traffic commercial spaces where strength and durability are priorities.
Glass Fire Doors
Glass fire doors use specialised fire-resistant glass (ceramic or borosilicate) framed within robust materials. They allow natural light into corridors and are popular in modern commercial lobbies, retail spaces, museums, and offices. Glazed fire doors can also feature vision panels within timber or steel doors, not just fully glazed designs.
Composite Fire Doors
Composite fire doors are made from a blend of materials such as mineral wool or gypsum cores with PVCu, GRP, or timber facings. They are popular for their cost-effectiveness, low maintenance, weather resistance, and strong fire performance. Composite fire doors are commonly used for external fire door applications in residential blocks, social housing, and educational buildings.
Fire Door Types by Design and Function
Beyond ratings and materials, fire doors also come in different functional designs suited to specific building layouts and requirements.
Flush Fire Doors have flat surfaces without panels, making them ideal for minimalist modern interiors. Their clean lines work well in contemporary homes, offices, and corridors where a simple, understated look is preferred.
Panel Fire Doors feature traditional raised or grooved panels that provide a classic aesthetic. They are commonly used in period properties, Victorian homes, and heritage buildings where the door style needs to match the character of the space.
Glazed Fire Doors feature fire-rated glass vision panels for safety and natural light. These are common in offices, corridors, and communal areas where visibility is important for both safety and design.
Single and Double Fire Doors: single fire doors suit standard entryways, while double fire doors (equal or unequal leaf pairs) are designed for wider openings in high-traffic areas such as hospital wards, school corridors, and commercial lobbies.
Essential Components of a Fire Door
A fire door is only as effective as its weakest component. A fire-rated door leaf installed without the correct frame, seals, or hardware will not perform in a fire.
Intumescent seals expand under heat to fill the gap between the door and the frame, preventing fire from passing through.
Smoke seals prevent the passage of cold smoke, which spreads faster than flames and is the leading cause of fire-related deaths.
Self-closing devices ensure the door returns to a fully closed position after being opened, maintaining the fire barrier at all times.
Fire-rated hinges are designed to withstand high temperatures without warping, keeping the door securely attached to its frame during a fire.
Fire-rated glass is used for vision panels, allowing light and visibility while maintaining the door's fire resistance rating.
All components must be compatible, tested together, and Certifire-approved, or CE marked, to ensure the door performs as rated.
How to Choose the Right Fire Door for Your Property
Choosing the right fire door depends on several factors. Here is what to consider before you buy.
Building type: Residential buildings typically need FD30 doors, while commercial, educational, and healthcare buildings may require FD60 or higher. The intended use of the building directly affects the fire door rating needed.
Location within the building: Doors on escape routes, such as corridors and stairwells, need higher ratings than doors to individual rooms. Areas with a higher fire risk, such as kitchens or plant rooms, may also need a higher-rated door.
Fire risk assessment: A thorough fire risk assessment will identify which areas require fire doors and the correct ratings for each location. This is a legal requirement for commercial and multi-occupancy buildings.
Certification: Always check for third-party certification labels such as Q-Mark plugs, Certifire, or BWF-CERTIFIRE. Look for BS 476 or BS EN 1634 test evidence and a valid Field of Application document from the supplier.
Aesthetics and budget: Balance fire safety requirements with interior design preferences and budget. Timber doors suit residential settings, steel suits industrial environments, and composite offers cost-effective external solutions. Emerald Doors offers a wide range of fire doors across different ratings and styles to suit various property types and budgets.
How to Identify a Certified Fire Door
If you need to check whether an existing door is a genuine fire door, here is what to look for.
Look for a certification label or plug on the top edge or hinge side of the door. This will show the fire rating (FD30, FD60), the manufacturer's name, and the testing standard used.
Check for intumescent strips around the door edges and smoke seals around the frame. These are visible as thin strips recessed into the door edge or frame rebate.
Fire doors are noticeably heavier than standard doors due to their solid core construction. A fire door is typically 44mm or thicker, compared to around 35mm for a standard internal door.
Check that the door has a self-closing device fitted and that it closes fully into the frame without sticking or leaving gaps. For a more detailed guide, read our article on how to identify a fire door.
Find the Right Fire Door at Emerald Doors
Fire doors are categorised in three main ways: by fire resistance rating (FD30 to FD240), by material (timber, steel, glass, composite), and by design (flush, panel, glazed, single, or double). The right choice depends on the building type, the door's location, your fire risk assessment, and the relevant regulations.
Emerald Doors is a trusted UK supplier offering a wide range of certified fire doors across ratings, materials, and styles. Whether you need an FD30 oak fire door for a flat or a glazed fire door for an office corridor, we have options to suit every need and budget. With our 10-year guarantee, price promise, and most orders delivered within 3–5 days, you can buy with confidence. Browse our fire door collection or call our expert team for advice.
FAQs About Fire Door Types
Here are answers to some of the most common questions about fire doors.
What is the Difference Between a Fire Door and a Fire Exit Door?
A fire door is designed to resist the spread of fire and smoke between compartments within a building. A fire exit door is a door on an escape route that leads to a place of safety outside the building. A fire exit door may also be fire-rated, but its primary purpose is to provide a means of escape.
Can I Paint a Fire Door Without Affecting its Rating?
Yes, you can paint a fire door, but only with standard water-based or oil-based paint applied in thin coats. Do not use intumescent paint unless the door's certification specifically requires it. Adding thick layers or specialist coatings not specified by the manufacturer may void the door's fire rating.
Are Fire Doors a Legal Requirement in Residential Properties?
Fire doors are a legal requirement in residential properties with two or more storeys where the loft has been converted into a habitable room. They are also required in flats and maisonettes, particularly on the entrance door to each flat in a block. Building regulations (Approved Document B) set out the specific requirements for fire doors in residential buildings.
What does the "S" Suffix Mean (e.g. FD30S)?
The "S" suffix indicates the door includes a smoke seal in addition to the intumescent seal. For example, FD30S means 30 minutes of fire resistance plus smoke containment. Smoke seals prevent the passage of cold smoke, which is the primary cause of death in fires, not the flames themselves.