Glass Balustrades Guide

Glass Balustrades: A Complete Guide

Glass balustrades are one of the most popular ways to add a contemporary feel to staircases, landings, balconies and decking. They let light flow through a space while providing a safe, sturdy barrier that meets Building Regulations.

This guide covers the key things you need to know before ordering glass for a balustrade project.

What Type of Glass Is Used for Balustrades?

Balustrade glass must be a safety glass — meaning it's designed to minimise injury risk if it ever breaks. Depending on the application, you'll typically use one of the following:

• Toughened glass — heat-treated to be around 4–5 times stronger than standard float glass. If broken, it shatters into small, relatively harmless granules rather than sharp shards. Suitable for most internal and external balustrades with appropriate framing or channel systems.
• Toughened laminated glass — two or more layers of toughened glass bonded together with a PVB or SGP interlayer. If one layer breaks, the interlayer holds the panel in place. Required for structural (frameless) balustrades where the glass is the primary barrier.

Glass Thickness for Balustrades

The right thickness depends on the panel size, fixing method, and whether the balustrade is internal or external (wind loading).

• 10mm toughened — suitable for smaller internal panels in channel or post systems
• 12mm toughened — the most common choice for internal balustrades with clamps or posts
• 15mm toughened — used for larger panels or external applications with higher wind loads
• 17.5mm toughened laminated (8.8mm + 1.52mm PVB) — suitable for frameless / structural internal balustrades
• 21.5mm toughened laminated (10.10mm + 1.52mm PVB) — required for most structural external balustrades

These are general guidelines. Always consult a structural engineer for specific loadings and compliance — particularly for external or elevated installations.

Building Regulations

Glass balustrades in the UK must comply with Building Regulations Approved Document K (Protection from falling, collision and impact) and relevant British Standards:

• BS 6180:2011 — Barriers in and about buildings. Specifies design loading requirements for balustrades.
• BS 6206 / BS EN 12600 — Impact performance classification for safety glass.
• Minimum barrier height: 1100mm for most balconies and landings (900mm for stairs in dwellings).
• Infill panels must resist a horizontal line load applied at handrail height — the specific load depends on the building type (domestic, commercial, crowd areas).

If you're working on a project that requires Building Control sign-off, make sure your glass specification and fixing method are backed by appropriate calculations.

Edge Finishes

For balustrades, the visible edges of the glass are usually finished to a smooth, safe standard:

• Flat polished — smooth, transparent edges with a clean, modern look. The most popular choice for frameless and semi-frameless balustrades.
• Bevelled — angled edge that catches the light. Sometimes used for decorative internal balustrades.
• Arrissed — lightly sanded to remove sharp edges. Acceptable where edges will be concealed in channels or clamps, but not recommended for exposed edges.

Glass Options

• Clear — standard float glass, slight green tint visible on thicker panels and polished edges
• Low iron (extra clear) — virtually colourless, ideal when you want maximum transparency
• Tinted — grey, bronze or blue for a subtle design accent
• Frosted / sandblasted — obscured for privacy, popular for balconies overlooked by neighbours

Common Fixing Methods

• Base channel / shoe — glass sits in a U-channel fixed to the floor. Clean, minimal look.
• Side-fixed clamps / standoffs — glass is bolted to posts or a wall via stainless steel clamps.
• Post and rail — glass panels sit between vertical posts with a top rail. Traditional but still popular.
• Point-fixed / bolt-through — glass is fixed via holes drilled through the panel. Requires precise hole positioning.

We can supply glass with holes, notches and cutouts for all common fixing systems. Just include the details when you order.