Glass Balustrade Fixing Methods: Channel, Spigot and Post Systems Explained

Glass balustrade fixing comes down to one decision: how the glass connects to the structure beneath it. That choice determines how the finished balustrade looks, what it costs, which substrates it suits, and how forgiving the installation is. This guide explains every fixing method FOL Design manufactures, with real prices, so you can choose the right system before you order glass.

What Are the Main Glass Balustrade Fixing Methods?

There are three families of glass balustrade fixing: continuous base channel, individual spigots, and post systems. Base channel and spigot fixings create a frameless look with no vertical posts. Post systems hold the glass between uprights and are the most forgiving on uneven or awkward substrates.

All prices are per linear metre inc. VAT. Supply rates reduce on longer runs, and you can get an exact figure for your project in about 60 seconds with the instant quote tool.

How Does Base Channel Fixing Work?

Base channel fixing uses a continuous aluminium channel bolted or cast into the floor edge, with the glass panels clamped or wedged inside it. Because the channel runs unbroken along the whole length, the finished balustrade is a clean, uninterrupted line of glass with nothing else visible.

The fixing details matter more with a channel than with any other method. The channel must be perfectly level and straight, because the glass will only ever be as straight as the hardware beneath it. Panels are plumbed individually with wedges or clamps inside the channel, which also makes single-panel replacement straightforward later. Our base channel frameless system is supplied from £338 per linear metre inc. VAT.

How Do Spigots Fix a Glass Balustrade?

Spigot fixing uses individual stainless steel clamps, each bolted to the substrate, which grip the glass panel from below. The glass appears to float above the floor with small polished feet: the most minimal look available, and a popular choice for decking and balconies.

Each spigot must be positioned precisely, because there are no posts to disguise small setting-out errors. Spigots suit solid substrates that can take a concentrated bolt fixing, such as concrete or steel. Our spigot fix frameless system is supplied from £338 per linear metre inc. VAT.

How Do Post Systems Fix the Glass?

Post fixing bolts stainless steel uprights to the substrate and holds the glass between them, so the loads are spread across multiple post fixings rather than a continuous channel or individual clamps. That makes post systems the most forgiving fixing method on uneven substrates, and the most DIY-friendly.

• Slotted post: the glass slots into grooves in the posts. From £169 per linear metre inc. VAT.
• Rail-less: stainless steel posts with no top rail, in 304 grade for indoor use or 316 grade for outdoor, with post centres up to 1200mm. From £169 per linear metre inc. VAT.
• Post and rail: posts with a continuous top rail across the panel tops. From £215 per linear metre inc. VAT, with installation at £82 per metre.

What Substrates Can a Glass Balustrade Be Fixed To?

Glass balustrades can be fixed to concrete, steel, brick and block, and properly reinforced timber. The substrate must resist the loads UK regulations require: a horizontal line load of 0.74 kN/m in residential settings under BS 6180.

• Concrete: ideal. The strongest fixing for channels, spigots, and posts alike.
• Steel: excellent, though it may need welded brackets.
• Timber decking: requires reinforcement. Fixings must go into the joists or a strengthened subframe, never the deck boards alone.
• Brick and block: good, but needs core drilling for a secure fixing.

On flat roofs and balconies the same principle applies: the fixing must reach the structural edge, not just the surface covering. If you are unsure what your substrate is, our guide on how to measure for a glass balustrade explains what to check and photograph before ordering.

Which Glass Balustrade Fixing Method Should You Choose?

Choose base channel or spigots when the frameless look is the priority and the substrate is solid and level. Choose a post system when the substrate is uneven, the budget is tighter, or you plan to fit the balustrade yourself. Still weighing up the two looks? Our post and rail vs frameless comparison covers appearance, cost, and installation side by side.

The fixing method also interacts with the glass specification. With a handrail incorporated, 15mm toughened glass is suitable. For drops over 600mm without a handrail, UK regulations require 17.5mm or 21.5mm laminated glass. The full requirements are covered in our glass balustrade regulations guide, and the step-by-step process in our glass balustrade installation guide.

Do Fixing Methods Change the Price?

Yes, significantly. Post systems start at £169 per linear metre inc. VAT for supply, while frameless channel and spigot systems start at £338 per linear metre. Installation ranges from £77 to £97 per linear metre depending on the system, with minimum charges from £308 to £461. A handrail adds £51 per metre where specified, and stability clips for frameless systems add £26 per metre.

Every price is published upfront: no site visit needed for a quote, and no waiting for a callback. Enter your run length into the quote tool and the system prices your exact project instantly.