Fireplace beams, often called mantels, are both functional and decorative. Getting their height right ensures safety, compliance, and aesthetic appeal.
There is no universal answer to the correct height for a fireplace beam above a wood burning stove or gas fire, as it depends on the specifics of your installation and the manufacturer’s guidelines.
Keep reading and we’ll show you how to work this out based on your situation.
Estimated reading time: 8 minutes
Table of contents
- Why Does Fireplace Beam Height Matter?
- What Is the Recommended Height for a Fireplace Beam?
- Non-Combustible vs Combustible Beams
- How Far Away From the Flue?
- How to Overcome Clearance Issues?
- What Materials Are Safe for Fireplace Beams?
- Design Tips for Fireplace Beam Placement
- The Importance of Professional Installation
- Maintenance and Care for Fireplace Beams
- Conclusion
- Frequently Asked Questions (FAQ)
It is important to note that this information is not located in Document J of the UK Building Regulations.
Instead, it’s determined by the following factors:
- Stove heat output
- The manufacturer
- Type of flue used (single skin/ twin wall)
- Material of the beam
To ensure the correct and safe installation of your fireplace beam, you should always consult a HETAS-registered engineer, who can clarify the application for your specific setup, as every installation is different.
Find your local HETAS engineer here
Why Does Fireplace Beam Height Matter?
The height of a fireplace beam is essential for safety and comfort. If placed too low, the heat from the fireplace can damage the beam or create a fire hazard.

Furthermore, a poorly positioned beam can not only disrupt the aesthetic of your room’s design but also pose a serious safety risk if improperly installed, potentially becoming unstable and detaching from the wall.
What Is the Recommended Height for a Fireplace Beam?
In the UK, the typical height for a fireplace beam is between 1,200mm and 1,350mm (120cm to 135cm) from the floor. This range is suitable for most standard fireplaces.
However, always consider the size of your fireplace and the proportions of the room. It is also essential that it is installed safely and in accordance with manufacturers guidelines.
Non-Combustible vs Combustible Beams
Fireplace beams are available in both combustible and non-combustible materials. Choosing the right one depends on your fireplace setup and clearance requirements.
Non-Combustible Beams
Non-combustible beams are designed for use where clearances from a stove do not allow timber beams. These beams are typically made from materials like plaster or stone, ensuring safety when placed close to the stove.

Suggested clearances for non-combustible surrounds and beams are:
- 250mm above a 5kW stove/ flue
- 350mm above a 7kW stove/ flue
These distances are based on manufacturers’ guidelines. If placed closer than recommended, the material may crack due to excessive heat. Non-combustible beams are suitable for gas and solid fuel (wood or multi-fuel) fires.
Shop all non combustible beams
Combustible Beams
When using combustible beams, such as oak, careful positioning is crucial to prevent fire hazards. A HETAS-registered installer should handle the installation, ensuring compliance with safety standards.

The stove’s manual will specify how close the beam can be positioned in relation to the stove. If the manual is unavailable, search online using your stove’s make and model.
For wood burning stoves, the average distance from the top of the stove to a combustible beam is 450mm (18″) as a minimum.
However, since 2024 the regulations have changed to 750mm (29.5″) from the top of the appliance if a manufacturer doesn’t state the distances.
This distance can vary based on the stove’s heat output and positioning (forwards/ backwards).
Gas fires also include clearance information in their manuals. Always follow these guidelines for safe installation.
Please also bare in mind the flue which also gets very hot! (Please see below).
How Far Away From the Flue?
As a general rule, combustible materials should be placed at least three times the diameter of the flue pipe away from the flue. For example:
- If the flue pipe is 5” in diameter, the beam should be at least 15” away from the flue.

This rule applies in any direction, whether upwards or diagonally as shown with A and B in the diagram above.
Twin Wall Flue
You can opt for Twin Wall Flue, which are insulated to reduce the required clearance distance.
Unlike single-wall flues, which must be kept at least three times their diameter away from combustible materials, most twin-wall flues have a much lower clearance requirement, typically 50mm, 60mm, or 70mm.
How to Overcome Clearance Issues?
If clearance distances cannot be met, consider these solutions:

- Heat Shields: Install a heat shield to protect the beam from excessive heat. These should have an air gap and conform to safety standards.
- Non Combustible Beams: Replace the wooden beam with a non-combustible alternative.
What Materials Are Safe for Fireplace Beams?
Wood is a popular choice for fireplace beams but requires careful placement due to its combustibility. Non-combustible materials like stone, metal, or concrete are safer options if placed close to the fire.
Always check the fire rating of the material before installation.
Design Tips for Fireplace Beam Placement
- Match the room’s style: Choose a beam material and height that complements your room’s design.
- Keep proportions in mind: Ensure the beam doesn’t overwhelm the fireplace or appear too small.
- Use decorative elements: Add corbels or brackets for a traditional look, or keep it sleek for modern designs.
- Leave space for decor: If you plan to display items on the beam, allow enough clearance to avoid heat damage.
The Importance of Professional Installation
Installing a fireplace beam requires precision and compliance with safety standards. Hiring a professional ensures the beam is securely fixed and meets all regulations. A HETAS-registered engineer can also advise on the best materials and placement for your setup.
Maintenance and Care for Fireplace Beams
- Regularly inspect wooden beams for cracks, warping, or heat damage.
- Clean the beam with appropriate products based on its material.
- Refinish wooden beams periodically to protect them from wear and tear.
Conclusion
When installing a fireplace beam, safety should always be your top priority. There is no one-size-fits-all rule, as clearances depend on your specific stove, flue setup, and the beam material.
Minimum non combustible beam clearances:
- 250mm above a 5kW stove/ flue
- 350mm above a 7kW stove/ flue
Minimum combustible beam clearances:
It was a known fact that 450mm (18″) as a minimum from the top of the stove/ flue is acceptable. However, since 2024 the regulations have changed to 750mm (29.5″) from the top of the appliance if a manufacturer doesn’t state the distances.
Always consult the manufacturer’s guidelines, follow building regulations, and work with a HETAS-registered engineer to ensure a safe and compliant installation.
Frequently Asked Questions (FAQ)
Yes, you can paint a wooden beam using heat resistant paint. Ensure the paint can withstand temperatures near the fireplace. This does not then make the combustible wood non combustible.
Non combustible materials like metal or stone are ideal for modern designs due to their sleek and minimalistic appearance.
Consult a HETAS-registered installer for confirmation for the correct distance based on your installation.
Yes, you can install a fireplace beam yoursled but It is strongly recommended to hire a professional for safe and compliant installation, especially when working with combustible materials.
Ensure the beam is installed at the correct clearance and consider applying a heat resistant plate underneath with an air gap to create a barrier between the beam and the heat.
Non combustible beams can still crack if placed too close to a stove or fire. Follow manufacturer guidelines for proper clearances.
Yes, but ensure the beam is securely fixed and does not obstruct the fireplace opening or create a fire hazard.
Yes, an electric fire can only produce up to 2kW of heat output. As long as the fan is not covered, it is completely fine.
Clearances for corner fireplaces are generally the same, but ensure the beam placement aligns with safety guidelines for the stove and flue.
Inspect your fireplace beam at least once a year, checking for cracks, heat damage, or signs of wear.
Disclaimer:
Bonfire cannot be held liable for any damage resulting from the use or installation of fireplace beams; always consult a HETAS-certified engineer to ensure your installation is compliant and safely signed off.