How to Measure Your Shower Opening for a Glass Door

You do not need to measure your shower to get a frameless door. We measure every opening precisely in your home before any glass is cut, and that measurement is the one the glass is made from. But taking your own measurements first is still worth five minutes, because the numbers tell you a lot about which styles will fit, whether your walls are square, and what to ask about when we visit.

This guide shows you how to measure properly, what each measurement means, and how to read the results. There is a helper below that turns your tape measure readings into the numbers that matter.

What You Need

• A steel tape measure (not a cloth one).
• A pencil and paper, or your phone.
• A level, if you have one.
• Five minutes.

Step 1: Measure the Width Three Times

Measure across the opening, wall to wall, at three heights: near the top of where the glass will go, at the middle, and at the bottom just above the curb or floor. Measure from finished tile to finished tile.

Why three? Walls are rarely perfectly straight or plumb. A wall can lean in or out by a quarter of an inch or more over its height, especially in older homes or where tile has been laid over uneven backing. Frameless glass is cut to the measured opening, so knowing how the width varies matters.

Step 2: Measure the Height on Both Sides

Measure from the top of the curb or the shower floor to where you want the glass to stop, on the left and the right. Most enclosures stop somewhere below the ceiling; a steam enclosure runs to the ceiling. If the two heights differ, your curb or floor slopes, which is normal: showers are built to drain.

Step 3: Note the Details

• Curb: its height and width, and whether its top slopes toward the shower.
• Bench or knee wall: glass may need a notch to fit around it, which the door and notch panel style is designed for.
• Shower head and controls: where they are, and which way the head points.
• What is in front of the shower: the clear floor before the toilet or vanity, which decides whether a door can swing.
• Tile status: if tile is not finished yet, wait. Glass is measured to finished surfaces. See our guide on when to order during a remodel.

Turn Your Measurements Into a Plan

Enter what you measured. The helper shows your working width, flags out-of-plumb walls and sloping curbs, and points out width ranges that suit particular styles. You can copy the summary to mention when you book.

Reading Your Results

Working width

The narrowest of your three widths is the one that counts, since the glass has to fit through the tightest point. A rough guide to how width shapes style:

• Under about 36 inches: a single hinged frameless door often covers the whole opening, if it has room to swing.
• Roughly 36 to 60 inches: a door and inline panel keeps the door to a comfortable width, or a frameless slider if space in front is tight.
• Over 60 inches: sliders, bypass doors or a door with one or more fixed panels.

These are general guides, not rules. We confirm the right configuration at your measure.

Out-of-plumb walls

If your widths differ by more than about a quarter of an inch, your walls are out of plumb. That is common, and it is exactly why frameless glass is custom cut rather than bought in standard sizes. Mention it when you book so we expect it.

Sloped curbs and floors

A difference between left and right heights means the curb or floor slopes. Again, normal and expected. The glass and sweep are fitted to it.

Clear floor in front

If the shower has less clear floor in front than the width of a door, a hinged door will struggle. Our small bathroom guide has a clearance check and the styles that work instead.

Why We Still Measure Ourselves

Frameless glass is unforgiving of small errors, because there is no frame to hide a gap. Our measure uses precise tools, checks the walls for plumb and square, notes the exact curb profile and any obstructions, and plans the hardware positions. That measurement is what your glass is cut to. Your own numbers help you plan and compare styles; ours make the glass fit.

An Example, Worked Through

Here is how a typical set of readings might look for an alcove shower:

With a working width of 48 inches and limited swing room, we would probably suggest a door and inline panel with a narrower door, or a frameless slider. We would confirm at the measure.

Measuring Other Shower Types

Tub with a shower

Measure the width across the tub deck from wall to wall at the deck, middle and top, and the height from the tub deck to where you want the glass to stop. Note whether the tub deck is flat or has a lip. See our bypass doors guide.

Corner shower

Measure each side of the opening separately along the curb, plus the height at each wall. For a neoangle, measure all three front segments and note the angle of the base.

Walk-in shower

Measure the length of the shower, the width, where the shower head is, and the width of the opening you want. That tells you whether a splash panel will keep water in.

Common Measuring Mistakes

• Measuring to the old frame. If an old framed door is still in place, measure wall to wall, not to the inside of the frame.
• Measuring before tile. The finished opening is smaller by the thickness of the tile and setting bed.
• Rounding. Write down the exact eighth of an inch. Small differences matter on frameless glass.
• Using a cloth tape. It stretches. Use a steel tape.
• Forgetting obstructions. Grab bars, soap niches near the edge, and the shower valve can all affect where hardware goes.

Photos That Help When You Book

Along with your measurements, a few photos help us prepare for the visit:

• The whole shower, straight on, from the bathroom doorway.
• Each side wall where the glass will meet it.
• The curb or tub edge, close up.
• Anything unusual: a bench, a niche near the edge, a window in the shower, a sloped ceiling.
• The floor in front of the shower, showing the toilet and vanity.

Measuring for a Replacement vs. a Remodel

Replacing an existing enclosure

Measure wall to wall and curb to the height you want, ignoring the old frame. When the old enclosure comes out there may be holes or marks in the tile where it was fixed. New hardware can often cover them, and we will talk you through it at the measure.

New shower in a remodel

Wait for finished tile, including the curb cap and any trim pieces at the edge of the opening. Even the edge trim changes the opening by a fraction of an inch, and frameless glass is cut to fit exactly. See when to order glass during a remodel.

Frequently Asked Questions

Do I need to measure before I call?

No. It is helpful for planning, but we measure precisely in your home before anything is ordered.

Should I measure before the tile is finished?

No. Glass is measured to finished tile. Measuring early risks glass that does not fit.

My walls are not straight. Is that a problem?

No. Most walls are not perfectly plumb. Custom-cut frameless glass is made to fit the actual opening.

How precise do my measurements need to be?

For planning, to the nearest eighth of an inch is plenty. The measurement the glass is made from is taken by us.

What if my curb is not level?

Very few are. The glass and sweep are fitted to the actual curb.

Ready for the measurement that counts? Get a free quote with an exact price the same day, or call 800-715-0031.