ADA Mirror Height: The 40 Inch Rule for Accessible Bathrooms

By Beverly Gene, Design Consultant, Claris Company. Every product detail in this guide is checked against the specifications of the mirrors Claris builds.

Published October 2026.

The ADA mirror height rule is 40 inches. Over a lavatory or countertop, the bottom edge of the reflecting surface sits no higher than 40 inches above the finished floor. Anywhere else in the room, 35 inches. The 2010 ADA Standards also advise a top edge of at least 74 inches, so one mirror serves seated and standing users.

Those three numbers settle most accessible bathrooms. Below: where to measure from, how the numbers stack over a vanity, and which Claris sizes fit. For everyday height in a bathroom that does not need to be accessible, see our guide to mirror height over a vanity.

What is the ADA mirror height requirement?

Section 603.3 of the 2010 ADA Standards for Accessible Design sets two maximums. A mirror above a lavatory or countertop is installed with the bottom edge of its reflecting surface 40 inches maximum above the finished floor. A mirror elsewhere, on a side wall or the back of a door, drops to 35 inches maximum. The advisory note to the same section adds the top: 74 inches minimum, so the mirror works for people who use wheelchairs and for people who stand.

Where mirrors are provided in an accessible toilet room, at least one must comply (section 213.3.5). When a room has both a mirror over the lavatory and a full-length mirror, the U.S. Access Board guide to toilet rooms recommends that one of each type comply.

Where do you measure the 40 inches from?

From the finished floor to the lowest point of the reflecting surface. Two phrases in that rule do the work.

Finished floor means the top of the tile, not the subfloor. Add the tile and its setting bed to the rough-in drawing.

Reflecting surface means the silvered glass you can see yourself in. A frame does not count. Neither does a frosted border or a satin band. On a backlit piece with a frosted band, such as PEBBLE, the reflection begins inside the band, so the glass itself hangs lower than 40 inches for the reflection to meet the rule. On a round or organic mirror, measure to the lowest point of the curve.

The common error is a mirror set to 40 inches at the edge of the glass, with the reflection starting an inch or more above it. Set the reflection first. The glass follows.

How do the numbers stack over an accessible vanity?

Start at the floor and work up.

• Lavatory rim or counter: 34 inches maximum (section 606.3).
• Gap to the mirror: 6 inches or less, since the reflection must begin by 40 inches.
• Top edge: 74 inches or more, per the advisory.

That leaves at least 34 inches of reflecting height. Our vanity mirror size guide sets the bottom edge 5 to 10 inches above the counter; an accessible vanity holds the low end of that range. Six inches is tight for a tall deck-mounted tap, so specify a low spout or a wall-mounted faucet set below the mirror line.

Below the counter, the lavatory needs knee and toe clearance for a forward approach (section 606.2), which a wall-hung vanity provides far more easily than a full-height cabinet. If the basin sits lower than 34 inches, the mirror can come down with it. Forty inches is the maximum. Lower is fine.

Which mirror sizes meet the ADA mirror height?

The test: with the bottom of the glass at 40 inches, does the top reach 74? Sizes are the catalogue sizes on each product page. On pieces with a frosted border, lower the glass so the reflection itself starts by 40 inches.

Tall vertical pieces clear both numbers at once: STONE, PEBBLE and VITA. On a wide accessible counter, the front-lit ACARI and BOCA do the same, and front light on the face is the better light for grooming. DIMO and ORSO meet the 40 inch rule and fall 2 inches short of the advisory top edge, which is a recommendation rather than a requirement. Many Claris models can be built to the size the project calls for, so a taller cut can close the gap.

Where should an accessible mirror's controls sit?

If the mirror light is part of the accessible design, its control is an operable part. Section 309.4 asks that operable parts work with one hand, with no tight grasping, pinching or twisting of the wrist, and with 5 pounds of force or less. They also sit within reach: 48 inches maximum for an unobstructed reach, dropping to 44 inches when the reach crosses a counter deeper than 20 inches (section 308).

Claris ships the wave motion sensor on its sensor builds. A pass of the hand switches the light, and dims it on dimmable builds, with no button to press. Check where the sensor sits on the glass against the reach range for the person using the room. A mirror hardwired to a plain wall switch has no buttons at all: the switch is the control, so place it within the same reach range. On that build, light and anti-fog come on together.

Anti-fog helps here too: a heated film behind the mirror clears the glass, so nobody has to lean across the counter to wipe it. See anti-fog mirrors.

Does the ADA apply to a mirror at home?

The ADA Standards govern public accommodations and commercial facilities: hotels, restaurants, offices and clinics. A private home generally sits outside them, though the numbers make a sound target for anyone planning to age in place.

In Canada, accessibility in buildings comes from the provincial building code, such as the barrier-free design requirements of the Ontario Building Code. The figures differ by province. Confirm them with the building department before the wall is closed.

For the full spec-sheet logic behind widths, clearances and ceiling heights, read how to specify architectural mirror dimensions. For the room-by-room picks, explore vanity mirrors, or browse the Design Journal.

Frequently asked questions

What is the ADA mirror height?

Over a lavatory or countertop, the bottom edge of the reflecting surface must sit 40 inches maximum above the finished floor. A mirror that is not over a lavatory or countertop must have its reflecting surface start at 35 inches maximum. The 2010 ADA Standards also advise a top edge of at least 74 inches.

Is the 40 inches measured to the frame or to the glass?

To the reflecting surface. A frame, a frosted border or a satin band does not count, so on a mirror with a frosted edge the glass hangs lower than 40 inches for the reflection to start in time. On a round or organic mirror, measure to the lowest point of the curve.

How tall should an ADA mirror be?

Tall enough to run from 40 inches or lower up to at least 74 inches, which means 34 inches or more of reflecting height. Vertical pieces such as STONE at 25.5 by 40.5 inches and VITA at 26 by 44 inches clear that span with room to spare.

Does the ADA apply to a bathroom mirror in a private home?

Generally no. The ADA Standards apply to public accommodations and commercial facilities. In a private home they are a design target, and a useful one for aging in place. In Canada, check the barrier-free rules in your provincial building code.

What faucet works under an ADA mirror?

With the lavatory rim at 34 inches maximum and the reflection starting by 40 inches, the gap is 6 inches or less. A low-spout deck faucet or a wall-mounted faucet set below the mirror line fits that gap, and its controls should work with one hand and no tight grasping.

Claris Company. 50 Carroll Street, Toronto, Ontario, M4M 3G3. +1-855-999-2124. info@clariscompany.com.