Interiors
Bathroom vanity installation cost
Vanities are sold like furniture and fitted like plumbing, and the gap between those two things is most of the bill. One question decides it: does the drain move? A floor-standing vanity on the rough-in that is already there is half a morning. A floating one sits above that rough-in, so the pipework has to come up inside the cabinet — about $690, plus framing in the wall to hang it from, and no product page mentions either.
Written and edited by Pablo Ruiz Quintero
Last reviewed 2026-09-21 · Nothing you type leaves your browser
The vanity is the easy part
What decides the price is one question: does the plumbing move? Reusing the drain that is already there is a connection. Moving it is an open wall, a plumber, and several hundred dollars no product page mentions.
The default single vanity. Room for real storage either side of the bowl and the size most stock tops are made for.
Two bowls need 60 in of vanity to sit far enough apart to use at once.
Kitchen worktop height, and what almost everything sold now is. The existing drain sits lower relative to the cabinet, which is not a problem — there is simply more room for the trap.
Doors leave the trap alone, which is why they are the cheap answer and always have been.
Top and bowl
One moulded piece, bowl and splash included, and no joint anywhere for water to find. The cheapest good answer in a bathroom and the one that ages least gracefully — it dulls and scratches and cannot be refinished.
No joint, no sealant line, nothing to fail. It also means the bowl and the top are one purchase and one replacement.
Three holes at four inches between the outer two. The old American standard and still what most stock tops are drilled for.
Almost always, and it has to match the drilling in the top.
Plywood box, solid wood face, soft-close as standard. The step that matters in a bathroom is the box material rather than the door, because the box is what meets the damp.
Always finds something: unpainted wall, flooring that stops where the vanity stood, damage under the old top.
A floor-standing vanity on existing plumbing is a genuine morning's work. A floating one is not — it is carpentry, plumbing and drywall in one job.
Used only to pick a regional labour rate. It stays in your browser.
36 in, fitted
$2,111
plumbing stays · $1,263 in parts · $848 in labour
The drain stays put, which is what keeps this to a morning
Floor-standing, on the rough-in that is already there. Everything else on this page is a shopping decision; this is the one that decides whether it is a morning or a day.
Does it fit the room?
The planning guidelines, which nobody checks until somebody’s elbow hits a wall.
These are guidelines rather than code, so an existing bathroom is allowed to fail them. What they predict accurately is whether the room will annoy you.
The same vanity, five tops
Everything else held still.
| Top | Fitted total |
|---|---|
| Laminate | $2,039 |
| Cultured marble, integrated bowl · yours | $2,111 |
| Solid surface | $2,471 |
| Granite | $2,543 |
| Quartz | $2,651 |
A vanity top is small enough that stone comes out of remnants, which is why the gap between laminate and granite here is a fraction of what the same choice costs in a kitchen.
Where the money goes
And what happens to the plumbing bar when the vanity floats.
What gets bought
- 36 in mid-range vanity, doors
Plywood box, solid wood face, soft-close as standard. The step that matters in a bathroom is the box material rather than the door, because the box is what meets the damp. Comfort, 36 in.$792 - Cultured marble, integrated bowl
One moulded piece, bowl and splash included, and no joint anywhere for water to find. The cheapest good answer in a bathroom and the one that ages least gracefully — it dulls and scratches and cannot be refinished.$216 - Faucet, 4 in centerset
Three holes at four inches between the outer two. The old American standard and still what most stock tops are drilled for.$175 - Shutoffs, supply lines and trap
The stops always get replaced — one that has not moved in twenty years will not reseat.$80
What it costs
National average. 36 in vanity, cultured marble, integrated bowl, one bowl, new stops and supplies, old one removed and the wall made good. Not included: flooring under the old footprint, tiling, and the mirror or the light above it.
A vanity is the one bathroom job where the fixture is a small part of the bill. Tiling the floor and the walls is separate, and it comes first — the vanity goes in after the floor tile, not before, so the tile runs underneath it and the floor can be changed one day without pulling the plumbing apart.
Worth knowing
- The plumbing stays where it is, which is why this is a morning's work rather than a day's. Changing the height from 32 to 36 in does not disturb it either — the drain ends up lower relative to the cabinet, and that is more room for the trap rather than less. The belief that a taller vanity means moving the drain is the commonest bit of wrong advice on this subject.
- The top must be drilled for the faucet you are buying: 4 in centerset here. Three holes at four inches between the outer two. The old American standard and still what most stock tops are drilled for. Stock tops are usually 4 in centerset, and a mismatch is discovered when the plumber unwraps the faucet.
- New shutoffs and supply lines are in this price and they are not optional. Two stops and two supply lines. They always get replaced: a stop that has not moved in twenty years does not reseat once you turn it, and finding that out after the vanity is in is a bad afternoon.
- Cultured marble, integrated bowl has the bowl moulded into it, so there is no joint and no sealant line anywhere for water to get into. In a room that gets soaked daily that is worth more than it sounds — and it also means top and bowl are one purchase, and one replacement.
- Taking the old one out always finds something: the wall behind it is unpainted, the flooring stops where the vanity stood, and there is usually a patch of damage under the old top. The wall repair is in this price; new flooring under the footprint is not, and it is why fitting a narrower vanity than the old one is rarely as simple as it looks.
On this page — 4 sections
One question decides the price
The short version
- Does the plumbing move? That single answer is worth more than everything else on the page put together.
- A floating vanity almost always moves it — about $690, plus blocking in the wall.
- Changing height does not. A taller cabinet gives the trap more room, not less.
- A 48 in double is not a double. Centrelines land 24 in apart against a 30 in minimum.
Vanities are sold like furniture. You pick a width, a finish and a top, and the price on the box is the price of the vanity. Then the plumber arrives and the job costs twice that, and nobody can quite explain why.
The reason is the rough-in — where the drain and the supply pipes come out of the wall. It was set when the bathroom was built and it does not move for free. A vanity that works with it is a connection: undo two nuts, do up two nuts, half a morning. A vanity that fights it means opening the wall.
Exactly two choices in the showroom make it fight.
| Works with the rough-in | Fights it | |
|---|---|---|
| Mounting | Floor-standing | Floating on the wall |
| Why | The drain is below the cabinet top, where it always was | The drain is below the cabinet bottom, where it shows |
| Storage | Doors | Full-width drawers |
| Why | The trap lives in the void behind the doors | The drawer box wants the same space as the trap |
| Plumbing cost | About $205 | About $690 |
| Also brings | Nothing | Blocking, drywall, and a wall to make good |
$205
Connecting to what is there
Half a morning
$690
Moving the drain
Open wall, plumber, make good
$68
An offset trap instead
When it is only the drawers
$52
New shutoffs
Not optional, ever
National Kitchen and Bath Association, Kitchen Planning Guidelines with Access Standards · checked 2026-09-21
The clearances that decide whether the room annoys you
There are three numbers in the bathroom planning guidelines that matter for a vanity, and the useful thing about them is that they are not code. An existing bathroom is allowed to fail all three. What they predict very accurately is whether the room will irritate you every morning.
| Vanity width | Centre to wall | Two bowls? | What it is for |
|---|---|---|---|
| 24 in | 12 in | no | A powder room or a very tight bathroom. One door or two small drawers, and the trap takes most of what is inside. |
| 30 in | 15 in | no | The common small size. Enough for a door and a drawer, and it clears the 15 in from the centreline to a side wall that the guidelines ask for. |
| 36 in | 18 in | no | The default single vanity. Room for real storage either side of the bowl and the size most stock tops are made for. |
| 48 in — single | 24 in | no | A generous single. It gets sold as a double and it should not be: two bowls here put the centrelines 24 in apart against a 30 in minimum, so two people cannot stand at it. |
| 60 in — true double | 30 in | yes | The smallest honest double. Centrelines land 30 in apart, which is the minimum the guidelines allow and the point at which two people can actually use it at once. |
| 72 in — double | 36 in | yes | Centrelines at 36 in, which is the recommended spacing rather than the minimum. It is the difference between a double that works and one that technically exists. |
Centre to wall assumes the bowl is in the middle of the vanity, which it is unless you have chosen an offset one. The minimum is 15 in and the recommendation is 20.
Measure these before ordering anything
- The alcove at the floor and again at worktop height. They will differ, and the vanity has to clear the narrower one.
- The bathroom door swing. A vanity that is fine on paper and blocks the door is the commonest return.
- The height of the drain above the floor, which tells you whether a floating vanity is a plumbing job.
- Whether the flooring runs under the old vanity or stops at it. A narrower replacement exposes bare subfloor.
- Clear space in front — 21 in is the minimum and 30 is the recommendation, measured from the front of the vanity.
- Where the light and the mirror are, because a wider vanity often means both have to move.
- The drilling in the top against the faucet you want, single, 4 in or 8 in.
- Whether there is blocking in the wall, if the vanity is going to hang off it.
Tops and bowls, and the combinations that do not exist
A vanity top is small enough that stone comes out of remnants, which is why the gap between the cheapest and dearest option here is a fraction of what the same decision costs in a kitchen. It makes the choice more about how it behaves than what it costs.
| Top | Per inch | Bowl in it | What it is |
|---|---|---|---|
| Cultured marble, integrated bowl | $6 | yes | One moulded piece, bowl and splash included, and no joint anywhere for water to find. The cheapest good answer in a bathroom and the one that ages least gracefully — it dulls and scratches and cannot be refinished. |
| Laminate | $4 | no | Cheapest of all and the only one on this list that fails outright if water sits at the joint around a drop-in bowl. Fine in a guest bathroom nobody uses. |
| Quartz | $21 | no | Non-porous, needs no sealing, and takes an undermount bowl cleanly — which is the detail that makes a vanity easy to wipe down. The usual choice where the budget allows it. |
| Granite | $18 | no | Natural stone, so it wants sealing every year or two in a room that gets soaked daily. Cheaper than quartz at this size because vanity tops come out of remnants. |
| Solid surface | $16 | yes | Repairable — a scratch sands out, which nothing else here allows — and it can have the bowl seamlessly integrated. It marks more easily than quartz and it forgives that marking. |
Three combinations do not exist, and each of them gets ordered anyway:
An undermount bowl under laminate. The cutout exposes raw particleboard at the one place water pools. It swells and there is no repair.
A separate bowl with an integrated top. Cultured marble and solid surface come with the bowl already in them. There is nowhere to put another one.
A vessel — sits on top on a 36 inch cabinet. It adds five or six inches, which puts the rim near 42 — chest height on most people. Vessels belong on the shorter cabinet, which is one of the few remaining arguments for the old 32 inch height.
MaterialsEstimator, Countertop material and fabrication price survey · checked 2026-09-21
What goes wrong
01Buying a floating vanity without looking at the wall
The existing drain sits lower than the bottom of a floating cabinet, so it shows unless it is moved up into the body — about $690. And drywall will not hold a vanity, so the wall needs blocking framed into it.
Instead — Look at the drain height before ordering. If a floating vanity is the point, budget the plumbing and the blocking as part of it rather than as a surprise.
02Assuming a taller vanity means moving the drain
It is the opposite. A 36 in cabinet puts the existing drain lower relative to it, which gives the trap more room and a better fall.
Instead — Go to comfort height without worrying about it. The only height that complicates the plumbing is going shorter, and nobody does.
03Buying a 48 in vanity as a double
The centrelines land 24 in apart against a 30 in minimum. Two people are touching shoulders and neither bowl has anywhere to put anything down.
Instead — A true double starts at 60 in. Below that, one generous bowl with worktop either side is a better bathroom than two cramped ones.
04Choosing drawers without asking about the trap
The P-trap is directly behind the bowl, where the drawer box goes. Some vanities are built with a notched drawer for it and some are not.
Instead — Ask which one it expects. An offset trap is about $68; moving the drain is ten times that.
05Ordering the faucet and the top separately
Single hole, 4 in and 8 in are three incompatible standards, and a stone top is drilled at the factory. The mismatch is found when the faucet is unwrapped.
Instead — Decide both at once and check the drilling on the actual top, not on the catalogue photograph.
06Reusing the old shutoff valves
A valve that has not moved in twenty years does not reseat once turned. It weeps, and it weeps behind a vanity that is now fitted.
Instead — New stops and supply lines every time, about $52. It is the cheapest insurance in the job.
07Fitting a narrower vanity than the old one
Flooring almost always stops where the old vanity stood. A narrower replacement exposes bare subfloor along a line that cannot be hidden.
Instead — Check where the flooring stops before choosing the width. Going wider is safe; going narrower means flooring work nobody quoted.
08Forgetting the door swing
A vanity that fits the alcove perfectly can still stop the bathroom door opening, and a bathroom door that will not open fully is a problem you notice every day.
Instead — Open the door and measure to where it lands before ordering. It takes a minute and it is the commonest reason a vanity goes back.
- 01Measure the alcove, not the old vanityWall to wall at the floor and again at the top, because they will differ. The new vanity has to clear the narrower of the two, and the bathroom door has to open past it.
- 02Look at where the drain comes out of the wallIts height off the floor decides everything. A floor-standing replacement almost always reuses it; a floating vanity almost never can.
- 03Decide doors or drawers, knowing it is a plumbing questionThe P-trap sits where the drawer wants to go. Either the drawer is notched, or the trap is offset, or the drain moves — and the price of those three is very different.
- 04Check the centreline against the side wallThe guidelines want 15 in from the middle of the bowl to the wall and recommend 20. A 24 in vanity gives you 12, which is why your elbow hits the wall.
- 05If it is a double, check the spacing between bowls30 in between centrelines is the minimum, so a true double starts at 60 in of vanity. A 48 in double is a single vanity with two holes in it.
- 06Match the top drilling to the faucetSingle hole, 4 in centerset or 8 in widespread. They are not interchangeable and a stone top cannot be redrilled on site.
- 07Budget new shutoffs whatever the plan saysA valve that has not moved in twenty years will not reseat. Finding that out after the vanity is in is a bad afternoon.
Tile runs under the vanity, not up to it — so the floor can be changed one day without pulling the plumbing apart, and so a narrower vanity later does not expose bare subfloor. That page works out tile, thinset and grout from the trowel the tile actually needs.
The floor goes in first- Rough-in
- Where the drain and the supply pipes come out of the wall, set when the bathroom was built. Whether a new vanity works with it or against it is the single biggest cost variable on this page.
- P-trap
- The U-bend under the bowl that holds water and keeps drain gas out of the room. It occupies the space directly behind the bowl, which is exactly where a drawer wants to be.
- Offset trap
- A trap that steps the waste sideways or down, so the drawer box can pass. About fifty dollars, against several hundred for moving the drain — and the answer most drawer vanities are designed around.
- Comfort height
- A vanity at 36 in rather than the older 32. It is kitchen worktop height, it is what almost everything sold now is, and it does not require touching the plumbing.
- Floating vanity
- Hung off the wall with the floor clear underneath. It needs framing in the wall to hang from and it almost always needs the drain raised into the body of the cabinet.
- Blocking
- Timber let into the wall between the studs, giving a wall-mounted vanity something solid to bolt to. Drywall will not hold one, and if the blocking is not there the wall opens to put it in.
- Integrated bowl
- A bowl moulded into the top as one piece, so there is no joint and no sealant line anywhere. In a room that gets soaked daily that matters more than it sounds.
- Centerset
- A faucet with three holes at four inches between the outer two. The old American standard, and what most stock tops are drilled for.
- Widespread
- A faucet in three separate pieces at eight inches apart. The top has to be drilled for it, and an 8 in top will not accept a centerset faucet — a mismatch discovered when the plumber unwraps the box.
- Vessel bowl
- A bowl that stands on top of the surface rather than in it. It adds five or six inches of height, so it belongs on a shorter cabinet than the current standard.
- Shutoff
- The small valve under the sink that isolates it. Twenty years of not moving means it will not reseat once turned, which is why they are replaced as a matter of course rather than a matter of choice.
- Centreline
- The middle of the bowl, which is what the planning clearances are measured from. It is the number that decides whether a double vanity is genuinely a double.
Common questions
- How much does it cost to install a bathroom vanity?
- About $700 to $1,800 fitted for a 36 in floor-standing vanity on the plumbing that is already there — cabinet, top, bowl, faucet, new shutoffs, the old one taken away and the wall made good. The figure roughly doubles if the plumbing has to move, which a floating vanity almost always requires. That single question decides more of the price than the cabinet does.
- Does a new vanity mean moving the plumbing?
- Usually not, and there are exactly two things that change that. A floating vanity sits above the existing rough-in, so the drain and supplies have to come up into the body of the cabinet. And a drawer vanity puts a drawer box where the P-trap is — though that one is usually solved with an offset trap or a notched drawer rather than by moving anything. Everything else, including changing the height, reuses what is there.
- Does changing from a 32 in to a 36 in vanity mean moving the drain?
- No, and this is the commonest piece of wrong advice on the subject. A taller cabinet puts the existing drain lower relative to the cabinet, which means more room for the trap rather than less. The trap arm simply runs at a slightly steeper fall, which is the direction it wants to go anyway. Going shorter is the awkward direction, and almost nobody does.
- How much does a floating vanity cost to install?
- Several hundred dollars more than a floor-standing one, and the cabinet is not where the difference is. Moving the drain and supplies up into the cabinet body runs about $690, and if there is no blocking in the wall to hang the vanity from, framing it in is another $245 plus making the wall good. Neither appears on the product page.
- Is a 48 inch vanity big enough for two sinks?
- No. Two bowls in a 48 in vanity put the centrelines 24 in apart, and the planning guidelines set 30 in as the minimum. Two people cannot stand at it at once, which is the only reason to want a double. A true double starts at 60 in — that gives 30 in between centrelines, which is the minimum, and 72 in gives the recommended 36.
- What is the best countertop for a bathroom vanity?
- Cultured marble, integrated bowl if the budget is the constraint: one moulded piece, bowl included, no joint anywhere for water to find. Quartz if it is not: non-porous, no sealing, and it takes an undermount bowl cleanly so the surface wipes straight into it. Granite is cheaper than quartz at this size because vanity tops come out of remnants, and it wants sealing in a room that gets soaked daily.
- Should I choose doors or drawers?
- Drawers are far more usable and they are a plumbing decision rather than a storage preference. The P-trap occupies the space directly behind the bowl, which is where the drawer box wants to be. Manufacturers solve it with a U-shaped notch in the back of the drawer, or you solve it with an offset trap for about fifty dollars. What you should not do is assume it will work out.
- What height should a bathroom vanity be?
- 36 in for adults, which is kitchen worktop height and what almost everything sold now is. The older 32 in standard suits children and short adults and makes everybody else stoop. The one exception is a vessel bowl, which adds five or six inches on top — put one on a 36 in cabinet and the rim lands near chest height, so vessels want the shorter cabinet.
- Do I need new shutoff valves?
- Yes, every time, and budget it rather than hoping. Two stops and two supply lines. They always get replaced: a stop that has not moved in twenty years does not reseat once you turn it, and finding that out after the vanity is in is a bad afternoon. It is about $52 for both sides including the supply lines, and it is the cheapest insurance in the job.
- Can I install a bathroom vanity myself?
- A floor-standing vanity onto existing plumbing, yes — it is genuinely a morning, and the hardest part is getting it level on a floor that is not. A floating vanity is a different proposition: it is carpentry, plumbing and drywall in one job, and getting the drain relocated to the right height inside the cabinet is not a first plumbing project.
- What does an 8 inch widespread faucet need?
- A top drilled for it — three holes at eight inches between the outer two. A top drilled for a 4 in centerset will not take one, and the reverse is also true. On a stone or cultured marble top the drilling happens at the factory and cannot be changed on site, so the faucet and the top have to be decided together.
- What is not in a vanity quote?
- Flooring under the old footprint, almost always. The tile or vinyl usually stops where the old vanity stood, so a narrower replacement exposes bare subfloor. Also the mirror, the light above it, any tiling, and moving the door if the new vanity blocks its swing.
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About the author
Pablo Ruiz Quintero — Editor
Editor of MaterialsEstimator. Decides which documents count as a source, what every default value is, and where the line sits between what the reader parses and what the engines compute.
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