Shower doors are one of the few bathroom purchases where "close enough" does not exist. A door that is a centimetre wider than the opening goes straight back in the crate. The good news: fit is completely predictable once you understand how doors are sized, how to measure, and what the spec sheet is telling you. This guide covers all three, for Canadian bathrooms from Vancouver to Halifax.
How shower door sizing actually works
The first thing to understand is that most shower doors are not a single fixed width. They are sold with an adjustment range, so a sliding door might be listed to fit openings from roughly 56 to 60 inches. The wall profiles (the vertical channels mounted to your walls) telescope within that range, which lets a factory-made door handle real-world openings that are never perfectly square. When you shop shower doors, the number that matters is that range, not the nominal size in the product name.
Height works differently. It is usually fixed rather than adjustable, and it is measured from the top of the shower base or curb, not the bathroom floor. Common heights land between 70 and 76 inches. If you have a bulkhead, sloped ceiling or a window in the shower area, check the height number early rather than last.
Typical size ranges by door type
Exact figures vary by manufacturer, so always confirm against the spec sheet, but these are the ranges you will see again and again across brands like Maax, Kalia and Kohler:
| Door type | Typical width range | Where it fits best |
|---|---|---|
| Pivot or hinged door | Roughly 22 to 36 inches | Smaller alcoves and stalls with room for the swing |
| Sliding (bypass) door | Commonly 44 to 48 or 56 to 60 inches | Standard alcoves, especially tub-to-shower conversions |
| Door plus fixed panel | Wide range, often 42 inches and up | Larger alcoves where one swinging panel would be too heavy |
| Corner enclosure | Often 32 to 42 inches per side | Corner installations, including neo-angle layouts |
| Tub door | Usually sized for a standard 60 inch tub | Alcove bathtubs, with a shorter panel height |
The 60 inch sliding door is the workhorse of Canadian renovations, simply because so many alcoves were built around the standard five foot tub.
How to measure the opening properly
Measure the finished opening, tile to tile or panel to panel, never the framing. If tile is not up yet, wait, or subtract the finished wall build-up using your installer's numbers. Then:
- Measure the width at three heights: top, middle and just above the curb. Record all three; walls are rarely identical.
- Check for plumb: hold a level against each wall. A lean of a few millimetres is normal and is exactly what the adjustment range absorbs. A dramatically out-of-plumb wall may push you toward a framed or semi-frameless door, which tolerates imperfection better than frameless glass.
- Measure the height: from the top of the curb or base to your intended door top, noting anything overhead that limits it.
- Measure the curb: the bottom track or door sweep must land fully on the flat of the threshold.
When you compare your numbers to a spec sheet, use the smallest width you recorded. A door can usually be adjusted smaller within its range; it can never be stretched larger.
Clearance rules worth checking before you buy
A door that fits the opening can still fail the room. Pivot and hinged doors need swing clearance: trace the full arc of the door and confirm it clears the toilet, the vanity, towel bars and the bathroom door. In compact bathrooms, common in older housing stock across Quebec and the Maritimes, a sliding door often wins purely because it needs zero swing room. Many hinged models are reversible, so check which installation direction keeps drips over the base.
Two rules apply everywhere in Canada. First, shower doors use tempered safety glass certified to North American safety glazing standards; reputable brands meet this, but confirm it on anything unfamiliar. Second, enclosure requirements come from the building and plumbing codes your province adopts and enforces locally, so for permitted work, confirm details like minimum stall dimensions and door swing with your local authority.
Common fit mistakes
- Measuring before the tile is on. Framing dimensions can differ from the finished opening by a couple of centimetres, easily enough to miss an adjustment range.
- Buying the door before the base. The base defines the opening. Choose from the shower bases first, then buy the door that matches its finished dimensions.
- Sitting at the very top of the range. If your opening equals the door's maximum width, any out-of-plumb wall can leave you short. Aim to land comfortably inside the range.
- Ignoring the plumbing wall. On a hinged door, you generally want the handle side away from the valve so you can start the water without soaking your arm.
- Forgetting glass weight. Hinged frameless panels are heavy and transfer that load to the wall; confirm the required blocking or anchoring before the walls are closed up.
- Skipping the delivery inspection. Check panels on arrival, especially in winter, when a cold-soaked pane deserves gentle handling and time to reach room temperature before installation.
Reading the spec sheet like an installer
Every reputable door publishes a spec sheet, and five lines on it do most of the work: the minimum and maximum opening width, the exact height and what it is measured from, the glass thickness (6, 8 and 10 mm are the common tiers, with thicker glass typical of frameless designs), whether the unit is reversible or handed, and the installed walk-in opening, which matters for accessibility and for getting in comfortably. Canadian spec sheets usually list both millimetres and inches; pick one unit and stay in it, because rounding back and forth is how openings get missed by a hair.
If a spec sheet does not state an adjustment range at all, treat that as a question to ask before ordering, not a detail to hope about. Vatero ships doors across Canada, and nobody enjoys the email about a beautiful door two centimetres too wide for the alcove.
Fit first, style second
Once your measurements are down on paper, the style decisions (frameless or framed, chrome or matte black, clear or frosted glass) become easy, because you are choosing among doors that actually fit. If you are planning the enclosure as a whole, our bathroom buying guides cover the rest of the system, and a matching set from the shower systems collection keeps finishes consistent from door hardware to hand shower.
Frequently asked questions
What is the most common shower door size in Canada?
Sliding doors sized for openings around 56 to 60 inches are the most common, because so many Canadian alcoves were framed around the standard five foot bathtub. For dedicated shower stalls, pivot doors in the 30 to 36 inch region are typical.
Can a shower door be cut down to fit my opening?
No. Tempered safety glass cannot be cut, drilled or trimmed after tempering without shattering. Fit comes from a door whose adjustment range covers your opening, or from custom glass fabricated to your measurements.
How much clearance does a pivot shower door need?
Plan for the full arc of the panel, which means clear floor space roughly equal to the door's width in front of the opening, with nothing in the arc's path. If the room cannot spare that space, a sliding door removes the problem entirely.
Should I buy the shower base or the door first?
The base first, every time. The base sets the finished opening the door must span, and its curb width determines whether the track or sweep seats properly. Choose the base, confirm finished dimensions after installation, then match the door's range to what you measured.
