What Size Options Are Available for a Glass Juliet Balcony?
Glass Juliet balconies are available in a range of standard sizes to suit different door openings, from smaller French doors to wider bifold and sliding door systems. Most standard options range from 1200mm to 3000mm in width, with bespoke sizes available for projects that require a specific dimension. Choosing the right size depends on the opening measurements, door configuration, fixing requirements and the glass specification needed for the balcony width. This guide explains the available size options, how to select the right fit and what to consider before ordering a glass Juliet balcony.
The Standard Widths Run From 1200mm to 3000mm
Widths increase in 100mm steps from 1200mm up to 3000mm and height stays fixed at 1100mm across every size, reflecting the guarding height set out in Part K of the Building Regulations, which is why it doesn't vary between sizes. That means only the width needs deciding once an opening is measured. Every size is manufactured to the same standard, whether it's fitted to a single door or a full run of sliding panels, giving you a straightforward choice whatever the project.
Matching a Size to Your Doors and Opening
Measuring the width of the opening is the natural starting point, then matching it to the nearest standard size. It helps to check the width at the top, middle and bottom of the opening rather than relying on a single point, since older openings can vary slightly along their height and using the smallest of the three gives the safest match to a standard size. Every size across the 1200mm to 3000mm span works with French, sliding and bifold doors, so the width of your opening is what determines the right choice, rather than the type of door fitted to it. A narrower opening naturally points toward the sizes at the lower end and a wider opening toward the sizes at the upper end, with the full selection in between covering everything a typical home might need.
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Explore Juliet Balconies→Why Glass Thickness Increases With Width
A wider span of glass calls for a heavier specification to handle everyday wind and pressure loads with confidence. Thickness is banded automatically by width, so it's built in without needing separate specifying. Widths from 1200mm to 1600mm use 13.5mm toughened laminated glass, widths from 1700mm to 2000mm step up to 17.5mm and everything from 2100mm to 3000mm is specified in 21.5mm, giving each size exactly the strength it needs for its span.
Choosing a Size Beyond the Standard Widths
When an opening calls for something beyond the usual widths, a bespoke size can be specified through our bespoke collection, built to the same glass standard, thickness banding and fixing options as every standard size. Going bespoke keeps the planning position just as simple too, since it still stays close to the opening rather than projecting outward, the same comparison that sets it apart from a traditional balcony.
Fixing Systems Available Across Every Size
Two fixing options suit every width: stainless steel bolt-on brackets or a Skyforce channel system. Both anchor into solid material either side of the opening, whether brick, block or timber framing, so it's worth checking what the surrounding wall is made of alongside the width itself. Both fixing types meet the same safety standard, so the choice comes down to which fitting style suits your home.
Before You Order
Measure the exact width of the opening.
Match it to the nearest standard size, or arrange a bespoke size for anything beyond 1200mm to 3000mm.
Check the glass thickness for your chosen width, already fixed by size and ready to go.
A standard size suits most homes and a bespoke option covers everything else. To find the right option for your home, visit Rooflights & Skylights UK.