Getting the measurements right is the first step toward choosing a vanity that looks good and works comfortably in your bathroom. Width is only the beginning. You also need to consider vanity depth, finished height, plumbing location, sink position, door and drawer clearance, surrounding fixtures, and even the route the vanity must travel through your home.
This Guide walks you through exactly what to measure before ordering.
For help choosing the vanity itself, see our Bathroom Vanity Buying Guide →
For mounting and plumbing connections, review the installation instructions for your selected product with your installer.
Before You Start: What You'll Need
Gather a few simple tools before measuring:
- Steel tape measure
- Pencil and paper or phone notes
- Painter's tape
- Level
- Phone camera
- Flashlight for viewing plumbing
- A simple sketch of the vanity wall
If you're considering a floating vanity, a stud finder can also be useful during the planning stage. Take photos of the vanity wall, existing plumbing, toilet, shower, bathroom door, outlets, switches, baseboards, and any other nearby obstacles.
Browse all sections 17 topics
- 1. Measure the Available Vanity Width
- 2. Measure the Vanity Depth
- 3. Measure the Finished Vanity Height
- 4. Check the Clearance Around the Vanity
- 5. Check Door Swing and Drawer Clearance
- 6. Measure the Existing Plumbing
- 7. Confirm the Sink Position
- 8. Use Vanity Size as a Starting Point
- 9. Measure Differently for Single and Double Vanities
- 10. Measure According to the Vanity Type
- 11. Measuring a Powder Room
- 12. Measuring a Primary Bathroom
- 13. When an Offset Sink May Work Better
- 14. Measure the Wall Above the Vanity
- 15. Check Baseboards, Trim, Flooring and Uneven Walls
- 16. Measure the Delivery Path
- 17. Common Measuring Mistakes to Avoid
1. Measure the Available Vanity Width
Start with the wall or opening where the new vanity will go. If the vanity will sit between two walls, measure the opening in several places:
- Near the floor
- At approximately countertop height
- Near backsplash or mirror height
Walls are not always perfectly straight or square, so use the smallest measurement as your available width. If one side of the vanity will remain open, measure from the wall to the maximum point where the finished countertop can comfortably end. The multi-height measuring approach and layout considerations are useful because wall openings can vary from top to bottom.
| Bathroom Layout | How to Measure It | What to Consider |
|---|---|---|
| Tight wall-to-wall opening | Measure at floor, countertop, and upper-wall height | Choose a vanity slightly narrower than the smallest opening |
| One side open | Measure from the fixed wall to your desired finished edge | More flexibility for cabinet width and countertop overhang |
| Between a toilet and wall | Measure available width plus toilet and drawer clearance | A narrower vanity or offset-sink layout may work better |
| Large primary bathroom wall | Measure the full wall plus mirror and lighting locations | Larger 60", 72", or 84" vanities may be possible |
Don't Forget the Countertop
The advertised vanity width generally refers to the cabinet size, but the countertop may extend slightly beyond the cabinet. Always review the overall finished dimensions, including the countertop, before ordering.
After you know the width, shop by vanity size.
- For small spaces, browse 24-inch bathroom vanities or 30-inch or 36-inch bathroom vanities.
- For medium bathrooms, browse 42-inch to 48-inch bathroom vanities.
- For larger bathrooms, browse 60-inch bathroom vanities, 72-inch bathroom vanities, and 80-inch and 84-inch bathroom vanities.
2. Measure the Vanity Depth
Vanity depth is the distance from the back wall to the front edge of the finished countertop.
Depth has a major effect on how open the bathroom feels, particularly in powder rooms, narrow bathrooms, and bathrooms where the vanity sits opposite a toilet or shower.
Measure from the back wall outward to where the front of the countertop would end. Once you know the depth you're considering, mark the vanity footprint on the floor with painter's tape (painter's test).
| Vanity Depth | Often Works Well For | What to Watch |
|---|---|---|
| 16"–18" |
Powder rooms and narrow bathrooms. Not a standard depth. |
Less countertop area and potentially fewer sink options. |
| 20"–22" | Most standard smaller and primary bathrooms. Standard industry depth. | Check drawer clearance and bathroom door swing. |
| 23"–24" | Larger bathrooms and primary baths, mostly for custom vanities. | Make sure the remaining walkway is comfortable. |
| Extra-deep vanity | Large or custom bathroom layouts. | May crowd the toilet, shower door, or walkway. |
Next Steps:
- Walk through the room
- Stand where you would use the sink
- Open the bathroom door
- Open the shower door
- Check the space around the toilet
- This gives you a much better sense of the vanity's actual footprint than measurements alone.
3. Measure the Finished Vanity Height
Measure from the finished floor to the top of the countertop. If you're replacing an existing vanity, start by measuring its current height. Then consider whether it feels comfortable or whether you would prefer the new vanity higher or lower.
| Finished Vanity Height | Often Best For | What to Consider |
|---|---|---|
| 30"–32" | Not standard, lower cabinets typically have vessel sinks. | Lower working height. |
| 34"–36" | Primary bathrooms and everyday adult use. Standard height in industry. | More comfort-height feel and less bending. |
| Floating vanity | Contemporary bathrooms and customized layouts. | Finished height can be adjusted during installation. |
Always review the finished height including the countertop, rather than looking only at cabinet height. For floating vanities, installation height also needs to work with the plumbing and mounting requirements.
4. Check the Clearance Around the Vanity
A vanity may physically fit on the wall but still make the bathroom uncomfortable.
Check the usable space:
- In front of the vanity
- Between the vanity and toilet
- Between the vanity and shower or bathtub
- Between the vanity and bathroom entrance
- From the sink centerline to a nearby side wall
- Around drawers and cabinet doors
| Clearance Area | Minimum Planning Reference | More Comfortable When Possible |
|---|---|---|
| Clear floor space in front of vanity | 21" | 30"+ |
| Sink centerline to side wall or tall obstruction | 15" | 20"+ |
| Toilet beside vanity | Check side clearance and drawer movement | Allow additional room for comfortable use and cleaning |
| Shower door beside vanity | Must open without contacting vanity | Extra clearance improves movement |
| Bathroom entry door | Must clear the vanity and drawers | Test the full door swing |
5. Check Door Swing and Drawer Clearance
One of the easiest mistakes to make is measuring the wall but forgetting how everything around the vanity moves. Use painter's tape to mark the vanity footprint and check:
- Bathroom entry door
- Shower door
- Linen closet door
- Vanity drawers
- Vanity cabinet doors
- Medicine cabinet doors
Also consider how far vanity drawers extend when fully open. Door and drawer collisions are a common reason a vanity that technically fits the wall doesn't work well in practice.
| Possible Conflict | How to Check | What May Help |
|---|---|---|
| Bathroom door hits vanity | Mark the entire door swing on the floor | Consider a shallower vanity |
| Drawer hits toilet | Measure the fully extended drawer path | Consider a different drawer or cabinet layout |
| Shower door hits vanity | Open the shower door fully and mark its path | Consider a narrower vanity |
| Drawer hits side wall | Check the drawer width and distance to the wall | Choose a configuration with better side clearance |
6. Measure the Existing Plumbing
If you're replacing a vanity and want to minimize plumbing changes, carefully record the existing drain and water-supply locations.
For every plumbing point, take two measurements:
1. Vertical Measurement
Measure from the finished floor to the center of the drain or valve.
2. Horizontal Measurement
Measure from a fixed side wall or corner to the center of the drain or valve.
| Plumbing Measurement | How to Measure | Why It Matters |
|---|---|---|
| Drain height | Finished floor to center of drain | Helps determine whether the drain clears drawers and interior shelves |
| Drain offset | Side wall to center of drain | Helps determine centered, left-offset, or right-offset sink compatibility |
| Supply-line height | Finished floor to center of hot/cold valves | Helps confirm interior cabinet clearance |
| Supply-line spacing | Distance between hot and cold valves | Helps plan plumbing connections |
| Wall or floor plumbing | Note where the pipes enter the vanity area | Especially important with floating or drawer-heavy vanities |
7. Confirm the Sink Position
Once you've measured the wall and plumbing, determine which sink position works for the space.
| Sink Configuration | Often Best For | Main Benefit |
|---|---|---|
| Centered single sink | Most standard bathrooms | Balanced layout and straightforward mirror placement |
| Left-offset sink | Bathrooms needing more usable countertop on the right | Creates a larger continuous counter area |
| Right-offset sink | Bathrooms needing more countertop on the left | Can work well with an asymmetrical room or plumbing location |
| Double sink | Primary and shared bathrooms | Allows two people to use the vanity at the same time |
If your existing plumbing is already offset, choosing an appropriately positioned sink may reduce the amount of plumbing modification required.
8. Use Vanity Size as a Starting Point
Once your measurements are complete, you can begin narrowing the vanity width. Fabubath offers vanity sizes for compact bathrooms through large primary bathrooms.
| Vanity Width | Often Works Well For | Typical Configuration Link to each size |
|---|---|---|
| 24" | Powder rooms and very small bathrooms | Single sink |
| 30" | Small bathrooms and guest baths | Single sink |
| 36" | Standard bathrooms | Single or offset sink depending on collection |
| 42" | Medium bathrooms | Single or offset sink depending on collection |
| 48" | Larger single-sink bathrooms | Single or offset sink |
| 55" | Bathrooms needing additional counter and storage space | Typically single sink |
| 60" | Primary bathrooms and shared spaces | Wide single or double sink |
| 66" | Larger primary bathrooms | Single or double depending on collection |
| 72" | Spacious primary bathrooms | Single or double sink |
| 84" | Large primary bathrooms | Double sink |
9. Measure Differently for Single and Double Vanities
A single-sink vanity gives you more flexibility with countertop and cabinet storage. Common single-sink widths range from compact powder-room sizes through large 60" and wider configurations.
For a double vanity, width becomes more important because the cabinet must accommodate:
- Two sinks
- Two plumbing areas
- Comfortable spacing between users
- Cabinet and drawer storage
| Double Vanity Width | Typical Use | How It Feels |
|---|---|---|
| 55", 60" | Compact double-sink primary bathroom | Functional, but sinks and countertop areas are closer together |
| 66”, 72" | Most shared primary bathrooms | Comfortable everyday balance |
| 80", 84" | Large primary bathrooms | More counter space and storage |
10. Measure According to the Vanity Type
Freestanding Vanities
Check the flooring, baseboards, plumbing, and the way cabinet doors or drawers interact with surrounding fixtures. If the vanity has legs, remember that the floor underneath will remain visible. If you're replacing a vanity without replacing the floor, check whether the flooring continues underneath the existing cabinet.
Floating Vanities
Check the wall width, desired finished height, drain and supply-line position, wall construction and open floor area underneath. If existing plumbing comes through the floor, changes may be needed before installing a floating vanity.
| Vanity Type | Extra Measurements to Check |
|---|---|
| Freestanding single sink | Floor area, baseboards, plumbing position, drawer and door clearance |
| Freestanding double sink | Two sink zones, plumbing positions, drawer clearance, mirror width |
| Floating single sink | Desired mounting height, wall support, plumbing height and position |
| Floating double sink | Wall support, two plumbing areas, finished mounting height |
| Offset-sink vanity | Exact drain offset and usable countertop space |
11. Measuring a Powder Room
Powder rooms are usually small, which makes every inch more important. Check the following:
- Available wall width
- Vanity depth
- Space to the toilet
- Bathroom door swing
- Sink centerline
- Mirror and lighting space
| Powder Room Layout | Vanity to Consider | Why |
|---|---|---|
| Very narrow powder room | 24" or shallow-depth vanity | Preserves valuable walkway space |
| Small but reasonably open | 30" vanity | Adds storage while remaining compact |
| Larger statement powder room | 30" or 36" vanity | Allows the vanity to become more of a design feature |
| Compact contemporary powder room | Floating vanity | Visible floor can make the room feel more open |
12. Measuring a Primary Bathroom
Primary bathrooms usually require more storage, countertop space, and careful planning around multiple users. Measure the following:
- Total usable wall width
- Side-wall clearance
- Toilet and shower clearance
- Bathroom and shower door swings
- Existing plumbing
- Mirror and lighting placement
- Drawer clearance
- Countertop overhang
If two people regularly use the vanity at the same time, compare a double-sink configuration with a wide single-sink layout before deciding. A 60" double vanity can work in a more compact layout, while 72", 80" and 84" options generally provide more comfortable countertop and storage space.
13. When an Offset Sink May Work Better
An offset sink positions the basin toward one side rather than directly in the center. It may be a practical choice when:
- The existing drain is off-center
- You want more continuous countertop space on one side
- The room is asymmetrical
- A centered sink would sit too close to a wall
- The cabinet layout gives you better storage with an offset sink
Offset layouts can sometimes reduce the need for major plumbing relocation when the existing rough-in is already off-center.
14. Measure the Wall Above the Vanity
Don't stop measuring at countertop height. A wider vanity or a different sink position can change where the mirror and lighting should be centered. Record the position of:
- Existing mirror
- Medicine cabinet
- Wall sconces
- Vanity lighting
- Electrical outlets
- Switches
- Window trim
- Wall tile
- Backsplash
15. Check Baseboards, Trim, Flooring and Uneven Walls
Look at the actual surfaces surrounding the vanity. Take accurate measurements as these details can reduce the usable opening or prevent the cabinet from sitting flush against the wall. For a vanity with legs, also inspect the floor underneath the existing cabinet. Check for:
- Baseboards
- Door casing
- Decorative molding
- Floor vents
- Tile trim
- Uneven walls
- Uneven floors
16. Measure the Delivery Path
This is especially important with Fabubath vanities. Fabubath vanities arrive pre-built, including large 72", 80" and 84" vanities. Do not measure only the bathroom. A large assembled vanity also needs enough room to turn through corners, not simply pass through a doorway. Check the entire route from the delivery point to the vanity location:
- Exterior entry door
- Interior doors
- Hallways
- Tight corners
- Staircases
- Stair landings
- Elevator openings, if applicable
- Bathroom doorway
17. Common Measuring Mistakes to Avoid
- Measuring Only the Existing Vanity: Measure the room itself. The old vanity may not be the best size for the space..
- Forgetting Countertop Overhang: The cabinet and finished countertop may have different overall dimensions.
- Measuring the Width Only Once: Measure between walls at several heights and use the smallest dimension.
- Ignoring Door Swing: A vanity may fit the wall but interfere with the bathroom or shower door.
- Forgetting Drawer Extension: Make sure drawers can open completely without hitting the toilet, wall, trim, or shower glass.
- Ignoring the Plumbing: Drain and supply locations can interfere with drawers, interior shelves, and floating vanity configurations.
- Choosing the Largest Vanity That Fits: A slightly smaller vanity can sometimes make the bathroom considerably more comfortable.
- Forgetting the Wall Above the Vanity: Mirror, lighting, outlets, and medicine cabinets need to work with the new sink location.
- Forgetting Baseboards and Flooring: Trim can reduce usable width, and exposed flooring matters when changing to a vanity with legs.
- Measuring the Bathroom but Not the Delivery Path: Large Fabubath vanities arrive assembled. Confirm that the vanity can actually reach the bathroom.
Visit Fabubath Showroom Before Ordering
If you're uncertain, make an appointment fo the Bath Design Consultation with the Fabubath team. We'll help you compare your space with the vanity specifications before you order. Walk-ins are accepted, appointments are recommended for more specific projects. Make an appointment for the showroom visit.
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Vanity Buying Guide →
Countertop & Sink Buying Guide →
Frequently Asked Questions →
Need Help Measuring or Selecting the Right Layout?
Contact Fabubath with questions about product dimensions, finishes and available configurations. Confirm installation and plumbing requirements with your installer before ordering.