Buying a bathroom mirror sounds simple until the box arrives and the mirror turns out wider than the vanity, crowds the sconces, or hangs so low that a tall faucet blocks the view. Most fit problems trace back to the same habit: shopping by style first and dimensions second. This guide flips that order. Whether you are refreshing a condo bath in Vancouver, an ensuite in the Prairies, or a century home in Halifax, the measuring rules are the same, and ten minutes with a tape measure can save you a return shipment.
Standard bathroom mirror sizes
Most rectangular vanity mirrors sold in Canada fall somewhere between 20 and 72 inches wide, with heights commonly in the 24 to 40 inch range. Round mirrors usually run from about 20 to 42 inches in diameter. One thing to watch: because manufacturers sell into both metric and imperial markets, spec sheets may list dimensions in millimetres, inches, or both. A mirror listed at 762 mm is a 30 inch mirror. Confirm the unit before you order, especially when comparing across brands.
Width is the dimension that does the heavy lifting, because it has to relate to the vanity below. The pairings in this table are typical starting points, not rules.
| Vanity width | Typical mirror width |
|---|---|
| 24 in (610 mm) | 20 to 24 in |
| 30 in (762 mm) | 24 to 30 in |
| 36 in (914 mm) | 28 to 36 in |
| 48 in (1219 mm) | 36 to 48 in |
| 60 to 72 in double vanity | One wide mirror, or two mirrors of 24 to 30 in each |
The golden rule: size the mirror to the vanity
The most reliable guideline in the category is simple: keep the mirror the same width as the vanity or slightly narrower. A mirror 2 to 4 inches narrower than the cabinet looks intentional and leaves breathing room for the frame. A mirror wider than the vanity almost always reads as a mistake, and it can interfere with towel bars, switches, and door casings on either side.
Double vanities open up a second option: one wide mirror spanning both sinks, or two individual mirrors centred over each basin. Two mirrors need enough wall between them to avoid looking crowded, so measure the distance between basin centres before deciding. And if you are still choosing the cabinet itself, settle on your bathroom vanity first. The vanity sets the width, the mirror follows.
How to measure the space
- Vanity width. Measure the cabinet, and note whether the countertop overhangs it. You will usually centre the mirror on the basin or on the cabinet, whichever reads better in your room.
- Usable wall width. Measure between the real obstructions: window trim, tile edges, shower glass, light switches, and any wall sconces that flank the mirror.
- Vertical space. Measure from the top of the backsplash, or the counter if there is none, up to the light fixture, bulkhead, or ceiling.
- Faucet height. Tall spouts and vessel-sink faucets rise well above standard ones, and the bottom edge of the mirror must clear them by a comfortable margin.
- The wall itself. Note stud positions and wall type. Large mirrors are heavy, and drywall anchors alone are not always enough.
Clearance guidance that prevents most mistakes
There is no single mandated mirror height in Canadian building or plumbing codes, so treat the following as fitting guidance rather than requirements, and defer to your local code and a licensed professional for anything electrical.
- Keep the bottom edge a few inches above the backsplash or faucet so splashes and spout arcs stay off the glass.
- Aim to put the centre of the mirror near eye level for the people who use the room most. In a household with a wide range of heights, a taller mirror hung slightly lower covers everyone.
- Leave clearance above for lighting. If a fixture is going over the mirror, subtract its height plus a visual gap from the available wall.
- Watch side clearances near shower enclosures and door swings. A wide mirror that ends right at a shower panel tends to collect spray.
Reading the spec sheet
Spec sheet quality varies across brands, but the fields worth checking are consistent:
- Overall versus glass dimensions. Framed mirrors usually list the overall frame size, and the reflective area is smaller. Confirm which number you are reading.
- Depth or projection. This matters in tight powder rooms and beside door swings. Backlit LED mirrors project further off the wall than plain glass.
- Weight and mounting. The sheet should state the hanging orientation, since some mirrors can hang vertically or horizontally, along with the hardware requirements.
- Electrical details on lighted mirrors. Look for a CSA or cUL certification mark, and note whether the unit is hardwired or plug-in. Hardwired installation is a job for a licensed electrician working to your local code, and permitting practice varies from province to province.
- Rough opening on recessed cabinets. A recessed medicine cabinet lists two sets of dimensions: the outside face and the rough opening it needs inside the wall. Brands like Sidler publish detailed rough-in drawings, and they are worth reading before anyone cuts drywall.
If storage matters as much as reflection, compare a plain mirror against a mirrored medicine cabinet. The face dimensions follow the same vanity-pairing logic, but you gain shelving behind the glass in exchange for extra depth or an opening in the wall.
Canadian climate and shipping notes
Cold-climate bathrooms fog. In winter, the temperature difference between a hot shower and a mirror mounted on a cool exterior wall makes condensation worse, which is why anti-fog defogger pads are a popular feature on LED mirrors sold here. If your vanity sits on an exterior wall, a defogger earns its keep from October through April across most of the country.
Mirrors also travel as fragile freight. Vatero ships mirrors Canada-wide, and wherever you buy, the same advice applies: unbox and inspect the glass on delivery day and report any damage right away, because carriers keep short claim windows on fragile goods.
Ready to shop with real numbers in hand? Start with the full range of bathroom mirrors, and if this is part of a bigger refresh, our other bathroom and kitchen buying guides cover vanities, lighting, and more.
Frequently asked questions
How wide should a bathroom mirror be compared to the vanity?
Equal width or slightly narrower is the safe zone, and most designers keep the mirror 2 to 4 inches narrower than the vanity cabinet. Going wider than the vanity rarely works unless the mirror is part of a deliberate wall-to-wall design.
What height should I hang a bathroom mirror?
Centre it near the eye level of the household's main users, and keep the bottom edge comfortably above the faucet and backsplash. There is no code-mandated height in Canada, so if your household varies a lot in height, choose a taller mirror rather than compromising on placement.
Do lighted mirrors need special certification in Canada?
Look for a CSA or cUL mark, which indicates the product has been certified to Canadian electrical safety standards. Plug-in models are straightforward to install, while hardwired models should be connected by a licensed electrician to your local electrical code.
Is a medicine cabinet measured the same way as a mirror?
Surface-mount cabinets are measured like mirrors with depth added. Recessed cabinets add a second measurement, the rough opening, which is the hole required in the wall between studs. Confirm stud spacing and what is inside the wall, such as plumbing, wiring, or exterior insulation, before committing to a recessed model.
