"> Frameless Shower Sizes | Lux Glass
August 19, 2026 · Bojan Stojic

Frameless Shower Sizes: What Gets Measured Before the Glass Is Cut

There is no standard size for a frameless shower. Every panel is cut to the opening it goes into, because tempered glass cannot be trimmed once it has left the oven. That is why the measure is taken on finished tile, and why a specific list gets checked first.

What is the standard size of a frameless glass shower door?

There is no standard. Frameless doors are cut to the opening, and most land between 24 and 36 inches wide at a height of 72 to 76 inches. Anything narrower than 22 inches is awkward to walk through. Lux Glass cuts every frameless door to the measured opening in Toronto and the GTA.

Can a frameless shower door be made to a custom size?

Yes, and in practice every one is. Frameless glass is cut, polished and drilled before it goes into the tempering oven, so the panel is made for one opening and cannot be altered afterwards. Custom is the normal case, not an upgrade. Lux Glass builds to measured sizes throughout the GTA.

When is a frameless shower measured?

After the tile is finished and grouted, never before. Tile and thinset add close to 1/2 inch to each wall, so a panel sized off backer board comes back too wide to fit. Lux Glass measures on finished surfaces on every frameless shower in Toronto and the GTA.

How wide can a frameless shower door be?

About 36 inches. Past that the panel gets heavy enough to work the hinges loose, since the whole load hangs off two or three fixings. A 10 mm door at 24 by 76 inches already weighs near 65 lb. Lux Glass holds hinged doors to that limit on GTA showers.

What is the largest frameless shower panel that can be made?

Height is usually capped near 96 inches by the tempering oven, and width by weight rather than by the glass. A 12 mm fixed panel at 36 by 84 inches runs close to 130 lb, which is what the wall backing carries. Lux Glass sizes large panels across the GTA.

What gets measured besides the width of the opening?

Height at both ends, wall plumb at three points, curb level and width, and the clear floor in front of the shower. A door that swings out wants about 30 inches of clear floor. Lux Glass records all of it at the measure on GTA frameless showers.

Why are the walls checked for plumb?

Because a shower wall is rarely straight, and the glass is. Walls are read at the bottom, middle and top, and the difference between those three numbers decides whether the panel sits in a wall channel or gets scribed. Lux Glass checks plumb on every frameless shower in the GTA.

Why does the curb get checked?

Because the door sits on it and water runs off it. A shower curb should pitch back into the shower by about 1/4 inch so water returns to the drain, and it has to be level end to end or the door hangs out of square. Lux Glass checks curbs across Toronto.

How much gap is left around frameless glass?

Around 3/16 of an inch at the hinge side and along the strike, which is what the seals and sweep are made to close. The gap is deliberate: glass cut tight to a wall has nowhere to go when the wall is not straight. Lux Glass sets those gaps in the GTA.

How is the height of a shower door decided?

From the curb up, not from the floor. The door starts about 1/2 inch above the curb so the sweep has something to seal against, and most doors finish between 72 and 76 inches. Taller openings take a fixed transom above. Lux Glass sets door height at the measure across the GTA.

Does glass thickness change the measurement?

Yes, because hardware is cut for one thickness. Hinges, clamps and channels made for 10 mm will not hold 12 mm, and the hinge cut-outs are made before tempering. Glass of 5 mm or thinner is never tempered for a shower. Lux Glass fixes thickness before measuring in the GTA.

Where does the backing behind the tile matter?

Wherever hardware lands. Hinges and clamps have to hit solid blocking or a stud, not tile over 1/2 inch backer board, because a 10 mm door puts its whole weight on two or three points. That is why fixing points are located at the measure. Lux Glass checks backing on GTA showers.

What size frameless shower fits a small bathroom?

An opening of 32 to 36 inches with a sliding door or a fixed panel, since neither needs swing room. Below 32 inches the opening gets tight to step through once the glass and hardware take their share. Lux Glass lays out compact frameless showers in Toronto condos.

Can I measure my own shower for frameless glass?

You can send rough dimensions and a photo for a first number, but the cutting measure is taken on site. Tempered glass cannot be trimmed after the oven, so a panel cut 1/4 inch too wide is remade, not adjusted. Lux Glass takes the cutting measure across Toronto and the GTA.

What happens if a frameless panel is measured wrong?

It is remade. Every cut, hole and polished edge is done before the glass enters the tempering oven, and after that the panel cannot be drilled or trimmed by even 1/8 inch. That is why the measure is taken on finished tile. Lux Glass measures on site across the GTA.

Frameless shower measurements across Toronto and the GTA

Lux Glass measures and builds frameless showers throughout Toronto and the surrounding region, including Oakville, Mississauga, Etobicoke, Burlington, Milton and Hamilton. A shower enclosure in Ontario has to be glazed in safety glass, and tempering is what makes a panel safety glass. Every panel is cut for one opening, so the measure is where the job is settled: opening width top and bottom, wall plumb, curb level, backing behind the tile, and the clear floor in front. Once those numbers are taken, the glass and the hardware are ordered together.

Planning a frameless shower

Send the opening dimensions and a photo of the space, or book a site measure. Lux Glass will confirm what the opening will take, and what that means for the glass and hardware, before anything is ordered. Call +1-416-897-0767 or request a quote.

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