Choosing and Placing a Bathroom Mirror: Size to the Vanity and the Light, Not the Wall

When people come to us for a bathroom mirror, the first question is almost always about size, and the first thing we ask back is what's underneath and around it, not how much wall space is available. A mirror that fits the wall but ignores the vanity and the lighting almost always looks slightly off once it's up, even if nobody in the room can immediately say why.

Start with the vanity, not the wall

A mirror generally reads best when it's a few inches narrower than the vanity or sink area it sits above on each side, not wall to wall. On a single-sink vanity, that usually means a mirror centered over the sink with breathing room on both sides, rather than one stretched to fill an entire wall that happens to be wider than the vanity itself. On a double-vanity, the common approaches are either one wide mirror that spans both sinks with a shared centerline, or two separate mirrors, each centered over its own sink with a consistent gap between them. Mixing the two, an off-center single mirror over a double vanity, is the single most common proportion mistake we see when someone is replacing a mirror on their own without a fresh eye on the layout.

Then work with the light fixtures, not around them

Sconces or a light bar mounted above or beside the mirror location change what height and width actually work. A mirror hung too high relative to wall sconces leaves a dead gap of blank wall between the mirror top and the fixture; hung too low, the light throws a harsh shadow across the face instead of lighting it evenly. If the vanity lighting is already installed, the mirror should be measured and sized around exactly where those fixtures sit, not the other way around. If you're planning new lighting alongside a new mirror, it's worth deciding the mirror size and placement first, since it's usually the fixed point the fixtures get built around, especially with sconce-style lighting that flanks the mirror directly.

Frame it or don't, and think about what's inside it

A custom-cut mirror can be framed, framed on just the bottom edge, or left as a clean frameless edge, and each choice reads differently depending on the rest of the bathroom. A frameless edge tends to disappear into the wall and works well in a room that already has a lot of visual detail from tile or fixtures. A framed mirror becomes its own visual anchor and can work well in a simpler room that could use one strong feature. Beveled edges catch light differently than a plain polished edge, which matters more than people expect once the vanity lights are on at night. None of these are right or wrong choices in the abstract, they depend on what's already happening in the room around them.

Getting the actual measurements right

Because every mirror we make is custom-cut, we measure the vanity, the light placement, and the wall together on site rather than working from a phone photo or a rough guess at dimensions. That's true whether it's a straightforward rectangular mirror or a shaped one designed to work around an existing niche or tile detail. If you're weighing a mirror alongside a shower or enclosure update in the same bathroom, it's worth doing both at once so the proportions of the whole room read as one considered space rather than two separate decisions. You can see examples of finished mirror installs and full bathroom projects in our gallery, learn more on our mirrors page, or reach out through our contact page to set up a measurement.