Most bathroom mirrors are placed above the sink. It’s not a requirement, although hanging your mirror elsewhere, such as to the side or behind your vanity and sink, might take some getting used to. [1] X Expert Source Emma OberlanderInterior Designer Expert Interview. 7 April 2021.

A typical rule of thumb is to keep your mirror at least 1 inch (2. 5 cm) smaller on both sides than the width of the vanity. [2] X Research source If you have or are planning to install lights alongside the mirror, factor their width into your measurements. If you are installing a round mirror, you don’t need to worry as much about matching the width of your vanity. If you have 2 sinks, consider installing a mirror above each sink instead of just 1 big mirror above both sinks. This will give the space a more designer look.

Consider both the height of the wall and the height of the people who will be using the bathroom most often. [4] X Research source For example, a bathroom used only by adults will probably have a taller mirror than one used frequently by children. Make sure your mirror is tall enough to accommodate people at least of average height (5’5” or 165 cm for women, 5’10” or 178 cm for men) and slightly taller and shorter. [5] X Research source

Sconces vary widely in size, but in the bathroom you should go with a smaller model, about 8-10 in. (20-25cm), or thin and elongated. Your sconces should be about 1/3-2/3rds the length of the mirror. Buy 2 of the same model and place them at least 4 in (10 cm) away from the mirror on either side. Factor their size and distance from the mirror into your measurements. Take care not to place the sconces too high or too low. Line them up with the center of the mirror.

Make sure the mirror clears your faucet![8] X Expert Source Emma OberlanderInterior Designer Expert Interview. 7 April 2021.

If you plan to put décor or practical objects on your countertop, make sure to place them so they won’t collide with your mirror.

Frameless mirrors will usually need to be glued onto the wall to avoid the appearance of bulky hooks. You can also use picture wire or mirror mounting clips to seamlessly mount or hang a frameless mirror.

The mirror in your bathroom can also be a fun statement piece. Consider a mirror with a brightly colored or mosaic-style frame, or try a mirror with a unique shape (like a crescent moon or heart) to add flair and style. Narrow frames are best for smaller mirrors and create a sleek, modern look for the space. Thicker frames tend to be richer and more ornate.

If you’re framing your mirror separately, ask for frame samples from a framing website or frame/mirror store to decide whether a frame is the right look for your mirror and bathroom.

This will save you time and money if you decide the style isn’t what you’re looking for. Making a template can also help you determine if the mirror you have in mind will be the right size for your space.

You can also cut costs and create a unique piece by adding your own trim to a frameless mirror.