Balustrade Height in the UK – What You Need to Know
When installing a balustrade in the UK, getting the height right is essential for both safety and compliance. Whether you’re working on a staircase, balcony or raised deck, there are clear building regulations that define the minimum balustrade height required.
In this post, we’ll break down the official rules, explain how they apply to different locations, and help you avoid common pitfalls in both residential and commercial settings.
What Is the Minimum Balustrade Height in the UK?
According to UK building regulations, particularly Approved Document K and BS 6180, the required height of a balustrade depends on its location:
- Internal stairs, landings and mezzanines:
Minimum height: 900 mm from pitch line or finished floor. - External balconies, roof terraces and raised decking:
Minimum height: 1100 mm from finished floor level. - Juliet balconies:
Typically 1100 mm, measured from internal floor level.
These heights are designed to reduce the risk of falls and ensure the balustrade provides effective protection.
Balustrade Height for Stairs
The most common question is: What height should a balustrade be on stairs in the UK?
For staircases inside homes or buildings, the handrail or balustrade must be at least 900 mm above the pitch line – the imaginary line that runs along the front edge of the steps.
If you’re combining a handrail with a glass or metal infill, the top edge of the barrier must still meet this minimum.
External Areas: Decking, Balconies and Roof Terraces
For outdoor areas elevated above ground level – especially those with a drop of more than 600 mm – a compliant balustrade is mandatory.
- Raised decking:
Requires a 1100 mm balustrade if the drop exceeds 600 mm. - Balconies and terraces:
Also require a minimum 1100 mm barrier, even if surrounded on multiple sides.
Always measure from the finished surface level, not the joists or structural base.
Glass Balustrade Height Requirements
If you’re installing a glass balustrade, the required heights remain the same, but you also need to ensure the glass meets safety standards:
- Use toughened or laminated safety glass.
- Frameless glass balustrades often require thicker panels due to loading requirements.
- Fixings and clamps must be correctly specified for the installation type (side-mounted, top-mounted etc).
A compliant glass balustrade not only protects from falls but does so with minimal visual impact – a popular choice for modern decks and balconies.
Common Mistakes to Avoid
Here are some of the most frequent issues seen during planning or installation:
- Measuring from the wrong point. Always measure from the finished surface, not substructures.
- Confusing handrail height with barrier height. The top rail alone may not fulfil the safety requirement.
- Using incorrect glass thickness or non-compliant fittings.
- Assuming indoor and outdoor heights are the same. They are not – outdoor installations require more protection.
- Overlooking regulations for decking. Any platform over 600 mm above ground must follow the rules.
UK Balustrade Regulations: A Quick Summary
The minimum height requirements in the UK depend on where the balustrade is installed:
- For internal stairs and landings, the required height is 900 mm.
- For external balconies, terraces and roof spaces, the minimum is 1100 mm.
- Juliet balconies also need to be 1100 mm from the internal floor level.
- If you’re installing a balustrade on raised decking (with a drop over 600 mm), you’ll need a barrier that is at least 1100 mm high.
These are the official minimums outlined in UK building regulations – and meeting them is essential to ensure safety and compliance.
A Safer, Smarter Balustrade Starts with the Right Height
Understanding the correct balustrade height is a key step in any build or renovation. By following current UK regulations, you’ll protect both the people using the space and the long-term value of your property.
At Balustradedesign, we offer compliant, tested balustrade systems designed to meet UK rules – without compromising on style or quality. Whether you’re building a raised deck or updating an interior stairwell, we’re here to help you get the details right.