For new construction or major rebuilds, yes - railing is part of the building permit. Like-for-like replacement usually doesn't need a separate permit, but municipalities vary.

Does spacing between panels matter?

Yes. No gap can allow a 4-inch sphere to pass through - top, bottom, and between panels.

Glass Railing Code Compliance in Ontario – What You Need to Know

Ontario Building Code (OBC) governs all guards and railings in the province, including glass ones. The basics: guards on decks, balconies, and stairs must be at least 36 inches high for residential interior and exterior runs under 6 feet above grade, and 42 inches above that threshold. Glass used as a guard must be tempered, laminated, or both depending on location and height. Loads matter too – guards must resist a horizontal load of 0.5 kN/m for residential and more for commercial. The details get specific fast, but every railing we install is built to meet or exceed OBC.

How high does a residential glass railing need to be?

For decks and balconies less than 1.8 m (about 6 ft) above the surrounding grade, 36 inches minimum. Above 1.8 m, the minimum jumps to 42 inches. Interior stair railings can be 36 inches, but a guard at the top of a stair landing follows the deck/balcony rule. The measurement is from the walking surface to the top of the railing.

What glass type does code require?

Inside, away from fall risk, tempered is typically fine. Outside, on guards above grade, OBC and the referenced standards (CAN/CGSB-12.1 and ASTM E2353) require either heat-strengthened laminated, fully tempered laminated, or a tempered panel inside a continuous top rail that retains the glass if it breaks. Frameless top-cap-free glass guards on balconies are almost always laminated.

What about load resistance?

Residential guards must resist a uniformly distributed horizontal load of 0.5 kN/m (about 34 lb/ft) and a point load of 1.0 kN. Commercial and assembly occupancy loads are higher – sometimes 1.5 kN/m or more. Engineers stamp these calculations for any commercial project and for residential projects where the building department asks.

Do I need a permit for a glass railing?

For new construction or a major deck/balcony rebuild, yes – the railing is part of the building permit. Replacing an existing railing with one of similar type usually doesn’t require a separate permit, but the local building department has final say. Toronto, Mississauga, Oakville, and Hamilton each interpret this slightly differently. We can usually tell you on the consult.

Does the spacing between panels matter?

Yes. The gap at the top, bottom, and between panels can’t allow a 4-inch sphere to pass through. That’s the “child safety” rule. It applies to the gap below the bottom of the glass (under spigot or standoff installs), to the gap between adjacent panels, and to the gap at posts. We size panels and hardware so every gap is under 4 inches.

What about pool fence glass?

Pool fences fall under both OBC and municipal pool bylaws. Most GTA municipalities require self-closing, self-latching gates and a minimum fence height of 4 feet (1.2 m). Glass is fine as a fence material if it’s tempered or laminated and the gaps meet the climbability requirements. Some cities require the latch at a minimum height – usually 54 inches.

Will my railing be inspected?

If it’s part of a permitted project, yes – the building inspector signs off on the guard during framing/finishing inspections. They’ll check height, gaps, load (sometimes by leaning hard on it), and they may ask for a manufacturer’s data sheet on the glass. We supply that paperwork on every permitted job.

What happens if a panel breaks after install?

OBC requires that when glass is used as a guard, broken glass cannot create a fall hazard. That’s why laminated glass dominates above 1.8 m – even if it breaks, it stays in the opening. It’s also why laminated spec dominates the deck and patio railing work we do in Burlington along the lakeshore. Tempered without a top rail above 1.8 m generally doesn’t comply.

Have a project you’re sizing up?

We do free in-home consults across the GTA. Call 416-897-0767 or message luxglass.com.