A mirror is the last thing bought and the first thing looked at. Most people order one at the end, off a phone, once the tile is up, the vanity is set, and the wall above the sink is the only bare thing left in the room.
By then most of the decision has been made for you. The vanity fixed the width. The lighting fixed the height. The framing behind the drywall settled, months earlier and permanently, whether a medicine cabinet could ever sit flush in that wall. What is left to choose is a frame.
That is fine if the earlier calls were made on purpose. Usually they are not. So take them in the order the house takes them.
Width comes off the vanity, not the wall
One rule holds nearly everywhere: the mirror should not be wider than the vanity top, and it generally looks better a little narrower — pulled in far enough that a margin of wall shows on each side. Go wider than the top and the room reads as wrong to people who could not tell you why. The eye compares two edges, and a mirror that overhangs the cabinet under it looks borrowed from another bathroom.
That is the aesthetic half. The practical half is that the wall over a sink is rarely empty. Sconces. A window return. An outside corner. A tall linen tower. Measure the clear wall between whatever is fixed, and size the mirror out of that, not out of the vanity width alone. If you are still choosing the vanity itself, the top overhangs the box on each side — measure the top.
Order by the right number
Two things catch people at the point of purchase.
- Overall size, not glass size. Sellers list one or the other and rarely say which, and a wide frame adds real width to the outside dimension. Ask. It is the same trap as net clear opening on a window.
- Standoff. A framed mirror stands proud of the wall. A sconce mounted close throws light across the wall face, and a deep frame casts a hard shadow down one side of the glass.
Weight is the third, and it decides how the thing hangs.
One mirror or two over a double vanity
There is no right answer, and anyone who gives you one is describing their own taste. There is a consequence, and the consequence is the useful part.
One long mirror spanning both sinks makes the wall read as a single surface, which in a narrow bathroom is the cheapest way to make the room feel wider. It also forces the light overhead or out to the ends, because there is nothing between the sinks to mount to. Two mirrors give you that wall between them — where a shared sconce goes — and let each one hang at a height that suits the person in front of it.
Both are on the wall in rooms we have finished. Where the light was going decided it every time.
Height follows the face, not the ceiling
Centering a mirror on the wall is how mirrors end up hung too high. Center it on the reflection you need, which is a face, and faces in one household are rarely at the same altitude.
The physics settles the argument. A flat mirror shows you the point halfway between your eye and the thing you are looking at. To see the top of your own head, the top edge of the glass only has to reach halfway between your eye line and your crown. A mirror never has to be as tall as the person using it, and hanging it higher does not help — it hurts, because the bottom edge climbs past your chin.
That answers the house where people are different heights. Do not split the difference; it suits nobody. Use a taller mirror — one piece of glass covering the whole range.
At the bottom edge, two things govern. It has to clear the faucet handle at full lift on a single-lever, so work from the spec sheet, not the showroom display. And it has to sit above the backsplash with a gap, not resting on it. Glass standing in water wicks at its open edge, lifts the silvering, and blooms inward as the gray-black speckle you see along the bottom of every old mirror.
The mirror is a lighting decision wearing a different hat
Light arriving from directly above puts your own brow, nose and chin between the source and your face. That is why a bathroom can be bright and still be a bad place to shave. What a mirror wants is light at roughly face height, from both sides — the task layer most bathrooms never get.
That has hard consequences for the glass.
- Sconces flanking the mirror take wall width, and their boxes go in at a fixed height and spacing. The mirror width is pinned before anyone buys one.
- A backlit or integrated-light mirror needs a junction box behind the glass, in one spot, under the tile. Once that box is set for a pair of sconces you cannot switch to a lit mirror without opening a tiled wall.
- An anti-fog heating pad wants power at that same box.
Pick the lighting scheme first. The mirror size falls out of it.
What holds the glass
Blocking goes in while the wall is open
The right fastening for a heavy mirror is a cleat or clips landed in solid wood. That means blocking — a flat piece let in between the studs at the height the fastener will sit. It costs almost nothing while the framing is exposed and is impossible afterwards without cutting drywall open. It goes in at the same stage as the waterproofing and substrate work, before anything you can see exists.
Skip it and the mirror does not usually fall. What happens is you get one fastening position, wherever a stud happened to land, and the mirror ends up centered on the stud instead of on the sink. Nobody can name what is wrong with that bathroom. They just see it.
Drilling into a finished wall
If the mirror lands on tile, somebody is drilling tile. Done properly that is a slow, wet, carbide-tipped operation. Done with a hammer drill it chips the glaze, and on a large-format tile a chip is not a repair — it is a tile, and that tile is grouted to its neighbors. A hole through tile is also a hole through the waterproofing behind it. On a dry vanity wall, a small matter sealed at the fastener. On a wall shared with a tub surround or a shower, not.
Recessing a medicine cabinet is a framing decision
A recessed cabinet is not really a purchase. It is a framing decision that arrives with a door on it. The body has to fit inside the wall cavity and the rough opening has to fit between two studs without cutting either one — harder than it sounds, because the wall above a sink is usually the wall everything else already runs in.
What has to be true of that bay
- Nothing in it. No supply lines, no drain, no vent, no wiring, no duct. The sink's vent typically rises directly above the trap — exactly where you want the cabinet. That one pipe is the most common reason a recessed cabinet ends up shoved to one side, or moved to the wall opposite the vanity.
- Enough depth. A shallow cabinet fits an ordinary stud wall. A deeper one does not, and no amount of wanting changes it.
- Not an exterior wall. Recessing into an outside wall means pulling insulation out and building a cold void into the envelope, on the wet side of the room. We say no to that. In an older Hamilton County house, where the insulation is already marginal, it is a condensation problem waiting for the first hard freeze.
- Not a bearing wall, casually. Cutting a stud means heading the opening, and in a wall carrying load that is a structural detail, not a preference.
When we frame the opening, and when we tell you not to
In an interior, non-bearing wall with nothing running through it, framing a clean opening is ordinary work. We cut it, head it, and move on.
When the bay has the vent stack in it, the honest answer is usually don't. Moving a vent means opening the wall to the ceiling, rerouting a pipe that has to hold its slope the whole way, and getting the result inspected — all so a box can sit flush instead of proud. That money buys better glass, better tile, or the lighting you notice every morning. We will tell you what it would take, then what we would do in your house.
Surface mount is not the consolation prize
A surface-mounted cabinet hangs the way a mirror hangs. Same blocking, no framing surgery, and it can be deeper than the wall allows — in a small bathroom that depth is real storage. The trade-off is projection. Near an outside corner or an in-swinging door, check it before you order.
What a medicine cabinet is actually good at
Small, tall, tippy things — the ones that fall over in a drawer and migrate to the back of the vanity. It is bad at towels, bad at anything bulky, and, despite the name, bad at medicine: warm damp air is close to the worst storage condition in the house for it.
Three things worth specifying before you order:
- Adjustable shelves, with one bay tall enough to stand a bottle in. Fixed shelves are spaced for a bathroom nobody lives in.
- A mirror inside the door. It costs almost nothing and it is what makes a two-mirror view possible.
- An interior outlet, for the toothbrush and the razor. That is a box and a circuit decided at rough-in, under the same rules as every other bathroom receptacle — tell the electrician while the wall is open, not after.
Doors in a wet room move, and the hinges want adjusting after a season, for the same reason wood moves in an Indiana house between heating season and July.
Where this lands in a bathroom budget
Mirrors and cabinets are a small line in a bathroom remodel. The blocking, the boxes and the framed opening that make the good version possible cost close to nothing when they are decided early. Nearly all the money spent here goes on undoing a late decision.
We do not publish our own prices, because a number written before anyone has seen your bathroom is a guess. For scale, independent cost research puts a typical Indianapolis-area bathroom remodel at around $10,000, with most projects landing between roughly $5,700 and $14,700.
Against that, a recessed cabinet and a surface-mounted one sit close together — unless it means moving a vent, and then it is a plumbing decision.
The order that keeps this cheap
Vanity dimensions first. Then lighting positions. Then mirror size. Then blocking and box locations. Only then does the drywall go on.
Every one of those is a conversation, and every one is free until the wall closes. That is why the walkthrough before the drywall goes up is worth more than any showroom visit — it is the last day the wall is still an option.
Bring the vanity spec sheet and the clear wall dimensions, and we will tell you on the spot whether the cabinet you want can be recessed and where the mirror lands. That sequencing is the point of how we plan a bathroom before anything gets ordered. If you want us to look at yours, ask for an estimate.
