Which Internal Doors Need To Be Fire Rated?

Failing to install fire-rated doors where necessary can have serious consequences. Not only can it put occupants at risk in the event of a fire, but it may also lead to non-compliance with building regulations, which can result in legal and financial repercussions. Fire safety is therefore a vital component in the design of any home or workspace, but which doors actually need to be fire-rated?

Fire doors play a vital role in compartmentalising a property, slowing the spread of fire and smoke, and allowing more time for safe evacuation. These doors are specifically designed to resist fire for a set period, depending on whether you choose an (FD30) or (FD60) door, helping to protect lives and limit property damage. Whether you’re renovating your home, building a new property or upgrading an existing space, understanding where fire doors are required is essential.

In domestic and commercial buildings alike, certain internal doors must meet fire safety standards. These regulations ensure that key escape routes remain protected, reducing the likelihood of fire spreading between rooms. Knowing which doors require fire ratings will help you make informed decisions and ensure your property meets legal safety requirements.

In this guide, Door Giant will cover everything you need to know about which internal doors need to be fire-rated, the relevant UK building regulations, and the benefits of installing fire doors in your property.

What Are Fire-Rated Internal Doors?

Fire-rated internal doors, commonly known as fire doors, are specially constructed to withstand fire for a specific period, typically 30 minutes (FD30) or 60 minutes (FD60). These doors are designed with fire-resistant materials such as solid cores, intumescent seals, and heat-resistant glazing (if applicable). Their purpose is to slow down the spread of fire and smoke, giving occupants more time to escape and emergency services more time to respond.

Fire doors must be fitted with the correct frame, hinges, and seals to function properly. They also require self-closing mechanisms in most cases to ensure they remain shut when not in use, maintaining their fire-resistant barrier.

Where Are Fire Doors Required In Domestic Properties?

UK building regulations specify that certain areas within homes must have fire-rated doors to improve fire safety. These include:

• Between an integral garage and the main house – A fire door must be installed between a garage and living areas to prevent fire spreading from a vehicle or stored materials.
• In properties with three or more storeys – Any home with three storeys or more, including loft conversions, must have fire doors on all habitable rooms leading to a stairwell. This applies to bedrooms, living rooms, and kitchens.
• In new-build or renovated homes with open-plan layouts – If an open-plan space disrupts a traditional fire escape route, fire doors may be required to create a protected corridor.
• Houses in Multiple Occupation (HMOs) – Rental properties with multiple tenants sharing facilities (such as student houses or bedsits) must have fire doors on all rooms opening onto escape routes.

Where Are Fire Doors Required In Commercial Buildings?

Fire doors are essential in commercial properties to ensure compliance with the Regulatory Reform (Fire Safety) Order 2005. The key areas where fire doors are required include:

• Escape routes and stairwells – Fire doors must be installed along designated escape routes to provide a safe exit for occupants.
• Kitchens and high-risk areas – Rooms with a high fire risk, such as commercial kitchens, boiler rooms, and plant rooms, require fire-rated doors.
• Shared spaces and corridors – Offices, hotels, care homes, and schools must have fire doors separating key areas, especially where multiple occupants use the same hallways.
• Storage rooms containing flammable materials – Any space used to store chemicals, paper, or other flammable goods must be protected by fire-resistant doors.

Fire risk assessments are legally required for commercial properties, and they will determine whether additional fire doors are necessary beyond these standard requirements.

How To Identify Fire-Rated Doors In A Property

If you’re unsure whether an existing internal door is fire-rated, there are a few key indicators to check:

• Look for certification labels – Fire doors are typically marked with a label on the top edge, indicating their rating (e.g., FD30 or FD60).
• Check the thickness – Fire doors are usually thicker than standard doors, measuring around 44mm for FD30 doors and 54mm for FD60 doors.
• Examine the door frame and seals – Fire doors should have intumescent seals along the edges, which expand in heat to block smoke and flames.
• Ensure proper hardware is installed – Fire-rated doors should have specific hinges, closers, and handles that meet fire safety standards.

If you’re in doubt, consult a fire safety professional or a door supplier to assess your property’s fire door requirements.

Fire-rated internal doors are a vital safety feature in both residential and commercial buildings. Understanding where they are required helps ensure compliance with UK building regulations while protecting lives and property. Whether you’re fitting fire doors in a new-build home, upgrading an HMO, or maintaining a commercial space, ensuring that the right doors are in place can make all the difference in an emergency.

If you’re planning a renovation or new installation, always check fire safety regulations and consult a professional if necessary. Investing in high-quality fire doors is a simple yet effective way to enhance the safety of your property and provide peace of mind.