By Beverly Gene, Design Consultant, Claris Company. Every measurement in this guide is checked against the spec sheets of the mirrors we build, and re-checked when the guide is updated.
A mirror sized to a catalogue chart fits the chart. A mirror sized to the wall fits the room. The difference is visible in every architectural photograph that ever made you want a different bathroom.
This is the sizing logic Claris specifies against, written for trade and architectural work: six dimensions to settle before signing a PO. Width, height, aspect ratio, clearance, scale by room, and when to call custom. The order is not optional. For residential vanity sizing by vanity width, the consumer companion is what size mirror for your vanity; this guide owns the spec-sheet side.
Key takeaways
- Start with the wall, not the catalogue: measure edges, sconces, switches, trim, and backsplash before choosing a size.
- Width default: vanity width, or 2 to 4 inches narrower on each side. Sconces need 3 to 4 inches of clearance.
- Height is two decisions: top edge 6 to 12 inches below the ceiling, bottom edge 4 to 8 inches above the counter.
- Aspect ratio is a design decision, not a rule; the room calls it.
- Write clearances on the PO. When the wall is not a catalogue size, custom dimensions are quoted per project.
The wall decides, not the catalogue
Most mirror sizing guides start with the mirror. That's backwards. Start with the wall.
Measure the wall the mirror lives on: width edge to edge, height floor to ceiling, location of every sconce, switch, outlet, and door trim. Note the depth of the vanity countertop and the height of the back-splash. Note the line where crown moulding lands, if any. The mirror that fits the wall is the mirror that fits these constraints, not the size chart at the showroom.
Catalogue sizes exist because they ship faster, not because they fit. Claris cuts to any width and height within the safe-glazing tolerance on every catalogue model. Custom dimensions carry a longer lead time, confirmed in every quote. That premium is the cost of a mirror that sits in the architecture instead of imposing on it.
Width: the relationship to the vanity
The default rule, when in doubt: the mirror runs the same width as the vanity, or two to four inches narrower on each side. That gives the eye a sense of intentional framing without leaving the vanity feeling crowded.
Use the table below as the working reference:
| Vanity width | Recommended mirror width | Notes |
|---|---|---|
| 24" single sink | 22" – 24" | Tight tolerance, no sconce flanking |
| 30" single sink | 26" – 30" | Standard small bath |
| 36" single sink | 30" – 36" | Default residential vanity |
| 48" wide single | 42" – 48" | Often with flanking sconces |
| 60" double sink | 56" – 60" | A single mirror, architectural |
| 72" full vanity | 66" – 72" | Primary bath or hospitality |
Three context calls shift the default:
Wall sconces frame the mirror. Sconces sitting outside the mirror's edge need three to four inches of breathing room on each side. The mirror narrows accordingly.
Double vanity, single mirror. When two sinks share one mirror, the mirror often runs the full vanity width minus the four-inch sconce clearance on each end. The single-mirror look is architectural; two separate mirrors can tip toward renovation-grade unless each aligns with its own basin.
Full-wall application. Hospitality washrooms and contract specs often run the mirror flush to wall trim, full vanity width plus the wall ends. This treats the mirror as a wall surface, not a fixture.
Height: top edge, bottom edge, and the model between them
Mirror height is two independent decisions.
Top edge. Six to twelve inches below the ceiling, or aligned with door trim, depending on architecture. A mirror that hits the ceiling looks like an installation error. One that floats well below it can feel undersized.
Bottom edge. Four to eight inches above the vanity countertop or back-splash. Closer than four feels cramped. Further than eight leaves an awkward gap of wall.
The math: ceiling height minus top clearance minus countertop height minus bottom clearance. The result is the mirror height.
On projects that must meet accessibility standards, the 2010 ADA Standards for Accessible Design set the bottom edge of the reflecting surface at a maximum of 40 inches above the floor when the mirror sits above a counter. Write it on the spec early; it constrains both the bottom clearance and the model choice.
| Ceiling height | Recommended mirror height | Aspect lean |
|---|---|---|
| Under 8 ft | 36" – 40" | Landscape |
| 8 to 9 ft | 40" – 48" | Landscape or square |
| 9 to 10 ft | 42" – 52" | Square or portrait |
| Above 10 ft | 48" – 60" or tall vertical | Portrait |
How the model decides the math
Each form mounts differently. The clearance rules either apply or the model overrides them.
PULSE (24 x 60 or 24 x 72) runs the wall. Vertical only. The 72-inch height closes the top clearance on its own. On a 9-foot ceiling above a 36-inch counter, a 4-inch bottom gap puts the top edge inside the rule with room to spare. On 10-foot ceilings, PULSE sits high on the wall by design.
COMO (39.5 x 33.5) is set from the bottom of the vanity. The mirror anchors to the vanity, not to a clearance above it. The 4 to 8-inch rule doesn't apply. Three mount positions (left, centre, right) offset the round form around the basin. Use COMO when you want the mirror at the vanity, not floating above it.
VITA (26 x 44) fits the rule. Standard clearances apply. 4 to 8 inches above the counter. 6 to 12 inches below the ceiling. A 30-inch vanity on an 8 to 9-foot ceiling is the easy case.
Cut any model to custom width and height.
For dressing rooms and walk-in wardrobes, the mirror often runs floor-adjacent, 60 to 80 inches tall, with the bottom edge eight to twelve inches off the floor for cleaning clearance.
Aspect ratio and shape
Aspect ratio is a design decision, not a rule. Each shape lands differently in the room. The decision sits with the designer and the architecture.
Square (1:1). Object-first. Often used in higher-ceiling baths, dressing rooms, and entryways.
Landscape (wider than tall). Horizontal and grounding. Often used above wide vanities and shared-sink washrooms.
Portrait (taller than wide). Vertical and architectural. Often used on narrow walls and single-sink baths.
Round. A designed object. Often used in powder rooms, foyers, and focal-wall applications. Diameter ranges from 24 inches up to 60 inches or more, depending on scale.
Arched. A contemporary signature. Best when the arch radius is specified to the architecture's curve language.
Asymmetrical and irregular. Art-led. Custom work, design-team led. The placement logic for these silhouettes, by visual weight rather than width, is in the organic mirror guide.
Statement scale. A round, arched, or rectangular mirror at 60 or 72 inches at the longest dimension can hold its own as the focal piece in a powder room, living room, or entryway. Scale is an architecture decision, not an aspect-ratio one.
Clearances: sconces, switches, ceiling, vanity
A mirror lives in a wall ecology. The clearance decisions move it from "ordered to spec" to "installed correctly". The National Kitchen & Bath Association publishes bathroom planning guidelines in the same territory; the working numbers below are the ones we spec against:
| Element | Clearance from mirror | Notes |
|---|---|---|
| Wall sconces | 3" – 4" each side | Closer feels crowded |
| Top edge to ceiling | 6" – 12" | Or aligned with door trim |
| Bottom edge to counter | 4" – 8" | Above back-splash |
| Light switches | Below mirror bottom edge | Standard 44" off floor |
| Outlets | Below counter | Standard 12" above counter |
| Crown moulding | Top edge falls below moulding | Never at it |
These are spec-sheet items, not assumptions. Write them on the PO. Don't leave them to interpretation.
Scale rules by room
The room decides the language.
Residential bathroom, primary. Mirror width equals vanity width minus four to eight inches total. Height proportionate, roughly 1.4 to 1.0 ratio. Backlit for atmosphere, front-lit for grooming. Tri-Temp LED for morning and evening. The lighting spec itself is a separate decision, covered in the designer's guide to LED bathroom mirrors.
Residential bathroom, secondary. Smaller scale. 24 to 36 inches wide is typical. Round or oval for character. Lower clearance to the vanity.
Hospitality guest bath. Mirror often runs full vanity width. Height typically 30 to 36 inches. Sized for stand-up grooming, not full-length use. High colour-rendering light for guest skin tones.
Dressing room or walk-in wardrobe. Vertical, full-length. 60 to 80 inches tall, 24 to 36 inches wide. Backlit halo, soft-touch dimmable LED. Specify for the full-body view.
Entryway and foyer. Round or arched. 30 to 48 inches diameter or longest dimension. Hung at eye height for the room's average user (roughly 60 to 65 inches off the floor to the mirror's centre).
Living room. Statement scale. 48 to 80 inches at the longest dimension. The mirror is an object, not a utility. Often paired with a console.
Powder room. Two paths. The smaller move (24 to 36 inches at the longest dimension) lets the wall speak first. The statement move (60, 72 inches, or larger) makes the mirror the focal piece of the room. Both are correct calls. The decision depends on ceiling height, wall length, and design intent.
Custom dimensions: when to call
The catalogue gets you 80 percent of installs. The remaining 20 percent calls for custom. Indicators:
- The wall isn't a catalogue size.
- The vanity is bespoke.
- The architecture (sconces, switches, ceiling, crown moulding) demands specific clearance.
- The project carries a lot consistency requirement (multi-unit residential, hospitality program, hotel rollout).
- The aspect ratio needed isn't in the standard catalogue.
- A custom shape (asymmetrical, irregular arch, organic silhouette) is part of the design intent.
Claris specifies to any custom dimension within the safe-glazing tolerance on every model. Lead times for custom dimensions, hospitality programs, and custom shape work are confirmed in every quote. The full custom process, samples, drawings, PO, and freight, is in how to specify a custom mirror.
The sizing spec sheet
One line settles every sizing decision when written correctly:
Custom W × H mirror to drawings, mounted flush at [height above counter], with [sconce clearance], [frame finish], and [mounting type]. Five-year warranty.
That line carries everything the manufacturer needs. The manufacturer who can read it and ship the mirror to that exact specification is the one worth specifying. The manufacturer who responds with "which catalogue size is that?" is not.
Frequently asked questions
How wide should a bathroom mirror be relative to the vanity?
The default rule is to size the mirror the same width as the vanity or 2 to 4 inches narrower on each side. A 60-inch vanity sits right with a 56 to 60-inch mirror. A 36-inch single-sink vanity sits right at 30 to 36 inches. Adjust for wall sconces, which need 3 to 4 inches of clearance from the mirror edge.
How high should a bathroom mirror be hung above the vanity?
Hang the bottom edge 4 to 8 inches above the vanity countertop or backsplash. Hang the top edge 6 to 12 inches below the ceiling, or aligned with the door trim if that sits cleaner. On accessible projects, the ADA caps the bottom reflecting edge at 40 inches above the floor over a counter. The mirror height itself is whatever the math leaves after those clearances are subtracted from the wall height.
Should I match the mirror width to the vanity or go narrower?
Match the vanity width for full-wall hospitality applications and contract specs. Go 2 to 4 inches narrower on each side for residential bathrooms where wall sconces frame the mirror. The narrower mirror looks intentionally framed. The full-width mirror feels architectural.
What mirror aspect ratio works best in a bathroom?
There is no default. Aspect ratio is a design decision. Landscape runs horizontal and grounding. Portrait runs vertical and architectural. Square is object-first. Round and arched are designed objects. The ratio that works best is the one that fits the wall, the vanity, and the design intent.
When should I order a custom-sized mirror instead of a catalogue size?
Order custom when the wall is not a catalogue size, the vanity is bespoke, the architecture demands specific clearance (sconces, switches, crown moulding), the project carries lot consistency requirements (multi-residential, hospitality programs), or the aspect ratio you need is not in the standard catalogue. Claris cuts to any width and height within safe-glazing tolerance on every model.
How big should a powder room mirror be?
Powder room mirror size depends on ceiling height, wall length, and design intent. A smaller mirror, 24 to 36 inches at the longest dimension, lets the wall speak first. A statement mirror, 60 or 72 inches at the longest dimension or larger, makes the mirror the focal piece in the room. Both are correct calls. The decision sits with the designer.
Where Claris fits
We build mirrors to the wall, not to the chart. Every catalogue model configures to custom width and height, quoted per project. Belgian glass. Copper-free silvering. Five-year warranty. Toronto-coordinated.
For Canadian projects, open a Canadian trade account. For US projects, open a US trade account. For specification support on a sizing question, contact us.
For homeowners working through a designer, ask your designer to bring Claris to the brief. For homeowners working directly, explore the catalogue and request a quote with your dimensions, or start from the room-by-room numbers in what size mirror for your vanity.
About the author
Beverly Gene is a design consultant with Claris Company, a Toronto architectural mirror studio, and works with designers and architects on mirror sizing, clearances, and specification on real projects. This guide reflects those spec-sheet conversations, checked against the specifications of the mirrors Claris builds. Claris makes custom and standard LED mirrors on low-iron Belgian glass, crafted in Europe, and backed by a five-year warranty. About us, partner with us, or get in touch.
