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Juliet Balcony Calculator
Calculate Juliet balcony glazing and balustrade costs for French doors with frameless or framed glass, steel railing or wrought iron barriers.
French door width
Part K: 1100mm minimum where drop exceeds 600mm. Enter your barrier height to check.
Number of balconies
Per unit override (0=auto)
Per balcony
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How We Calculate This
Estimates Juliet balcony costs based on balustrade type, opening width and quantity.
The formula
Total = (Base cost per m × Width × Qty) + (Installation × Qty)
- Base rates are indicative 2026 UK supply-only estimates (frameless glass ~£350/m, framed glass ~£280/m, steel ~£220/m, wrought iron ~£400/m) — always confirm with a supplier quote
- The barrier must be at least 1100mm high where the drop exceeds 600mm (Approved Document K)
- Glass must be toughened laminated safety glass (BS EN 12150 + BS EN 14449); frameless systems typically use 17.5mm or 21.5mm makeups
- Domestic Juliet barriers are designed for a 0.74 kN/m horizontal line load (BS 6180:2011 / BS EN 1991-1-1 UK NA)
Frequently Asked Questions
Building Regulations (Part K) require balustrades at heights over 600mm to be at least 1100mm high. Juliet balconies must meet this requirement. The barrier must withstand the required loading.
Usually not if they don’t project beyond the building wall. However, if the doors behind are new or enlarged openings, Building Regulations apply. Listed buildings need consent.
Steel railings are typically cheapest at £200-300 per metre. Framed glass costs £250-350/m. Frameless glass is £350-500/m. Wrought iron is £350-500/m for decorative designs.
It is possible for competent DIYers but the fixings must be designed for the required loading (0.74 kN/m horizontal). Glass balustrades should be installed by specialists due to the weight and precision needed.
Toughened laminated safety glass to BS EN 12150 (toughened) and BS EN 14449 (laminated). Frameless systems typically use 17.5mm or 21.5mm laminated-toughened glass, with thickness scaled up for wider openings; framed systems commonly use 10mm toughened. The laminated interlayer holds fragments together if the glass breaks. Clear, tinted and frosted options are available.
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Last updated: March 2026
Verified against UK standards · estimates only, confirm with your supplier.