How to Choose Bathroom Vanity Size: A Practical Guide

Table of Contents

• Why Vanity Size Matters for Your Bathroom Layout
• Standard Bathroom Vanity Sizes and Width Options
• How to Measure for a Bathroom Vanity
  • Step 1: Measure Your Available Wall Space
  • Step 2: Account for Door Swing and Clearance
  • Step 3: Check Plumbing and Electrical Locations
  • Step 4: Record Everything on a Measurement Worksheet
  • Step 5: Work Through a Real Example
  • Step 6: Verify Dimensions Before Ordering
• Bathroom Vanity Depth: What You Need to Know
• Bathroom Vanity Height and Basin Type Considerations
  • How Basin Style Changes Finished Height
  • How Basin Style Changes Usable Counter and Storage
  • Faucet Placement and Reach
  • Matching Height to the User
• Single versus Double Vanities: Making the Right Choice
• Sizing Vanities for Small, Medium, and Large Bathrooms
• Common Mistakes to Avoid When Selecting Vanity Size
• Frequently Asked Questions

Last Updated: October 12, 2026

Why Vanity Size Matters for Your Bathroom Layout

The right bathroom vanity size shapes how your bathroom functions. Too wide crowds the space, too deep blocks movement, and the wrong height makes daily routines uncomfortable.

At WDC Services, we help homeowners choose vanities that transform cramped bathrooms into functional retreats, the difference comes down to accurate measurements.

A properly fitted bathroom vanity size gives you counter space, storage, room to move, and smoother installation.

Standard Bathroom Vanity Sizes and Width Options

Most bathroom vanities fall within a predictable range. According to Kraftersland’s 2026 Standard Dimensions Guide, typical vanity widths range from 600 mm to 1,800 mm, with depths between 450 mm and 550 mm, and heights from 750 mm to 900 mm.

The most common widths work well for different bathroom types:

• 600-750 mm: Powder rooms and small bathrooms
• 900 mm: Single-sink family bathrooms (the most popular choice)
• 1,200 mm: Larger family bathrooms with good wall space

A 900 mm single vanity gives enough counter space without overwhelming a modest bathroom; double vanities start around 1,200 mm.

Shallower depths (450 mm) suit tight spaces, while standard depth (500-550 mm) gives proper counter space and storage.

Most vanities sit at 800-850 mm finished height (including the basin), some are lower at 750 mm, and accessible designs reach 900 mm.

How to Measure for a Bathroom Vanity

Measuring correctly prevents expensive mistakes. Account for wall space, plumbing locations, door clearance, and traffic flow with the steps below.

Step 1: Measure Your Available Wall Space

Measure the wall corner to corner in millimetres, and note obstacles: windows, light switches, outlets, or existing pipes.

Measure wall height, check for anything above the vanity (shelving, mirror, cabinetry), and mark plumbing rough-ins or electrical lines.

Write down these measurements:

• Total wall width (corner to corner)
• Height available above the finished floor level
• Distance from corners to any obstacles

Step 2: Account for Door Swing and Clearance

Open the bathroom door fully and measure its swing, a vanity near the door can’t block it.

You need at least 600 mm of clear floor space in front of the vanity to stand comfortably, or 750 mm or more if two people share the bathroom.

Measure from the vanity to the opposite wall or fixture to confirm room to move; a narrow bathroom may need a shallower vanity (450 mm instead of 550 mm).

Step 3: Check Plumbing and Electrical Locations

Find the water supply and drain lines. Most vanities have centre or slightly off-centre drain holes, so awkward plumbing may require a custom layout.

Check outlets near the vanity for a mirror light or heated towel rail, and confirm their height and position.

Step 4: Record Everything on a Measurement Worksheet

A worksheet gives your supplier or installer a single reference point. Copy the template below.

Measurement	What to record	Worked example (900 mm single vanity)
Wall width (corner to corner)	Full unobstructed run in mm	1,240 mm
Usable width after obstructions	Wall width minus door swing, pipes, outlets	1,240 mm − 120 mm door swing = 1,120 mm
Wall height above floor	Floor to underside of mirror or shelf	1,050 mm
Vanity depth available	Wall to opposite fixture minus 600 mm walkway	1,180 mm − 600 mm = 580 mm
Plumbing centreline	Distance from left corner to drain centre	620 mm
Water supply centrelines	Left and right in mm	520 mm / 720 mm
Electrical outlet position	Distance from left corner, height above floor	300 mm from corner, 1,100 mm high
Door swing radius	Door width plus frame	820 mm
Finished floor to basin top (target)	Chosen height	850 mm

Step 5: Work Through a Real Example

Say your wall is 1,240 mm corner to corner, the door swings 820 mm, and the drain sits 620 mm from the left corner. Subtracting the door swing leaves 1,120 mm of usable wall, so a 900 mm single vanity fits with 220 mm clearance. The drain at 620 mm sits close to the centre of a 900 mm vanity (450 mm from the left edge), so a standard centre-drain cabinet works; a drain at 200 mm would need an off-centre drain or custom cabinet.

Step 6: Verify Dimensions Before Ordering

Before you commit, check these against the product listing or ask the supplier:

• Packaging dimensions versus finished dimensions, a vanity that fits your wall may not fit through a doorway or stairwell in its crate.
• Finished dimensions including countertop overhang, which can add 10-20 mm to the cabinet width.
• Filler panels, if your wall isn’t perfectly square, a filler panel bridges the gap between the vanity edge and the wall.

Bathroom Vanity Depth: What You Need to Know

Standard depth is 500-550 mm, enough for a basin, taps, and counter items, fitting most layouts without blocking traffic.

Basin style affects usable depth too: a pedestal basin leaves more floor space visible, while a cabinet vanity adds drawers and shelves.

Measure from your wall to the opposite fixture, subtract at least 600 mm for movement, and the remainder is your maximum safe vanity depth.

Bathroom Vanity Height and Basin Type Considerations

Vanity height is measured from the finished floor to the top of the basin. Standard height is 800-850 mm, but the basin you choose changes that number.

How Basin Style Changes Finished Height

Each basin type sits differently in or on the counter, so the same cabinet can produce very different finished heights:

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• Undermount basin: mounted below the counter, so the rim is hidden. Finished height is typically cabinet height plus counter thickness (often 20 mm), the basin itself adds little to the top line. This gives the lowest finished height and the cleanest look.
• Inset (drop-in) basin: the rim sits on top of the counter. Adds roughly 10-20 mm above the counter surface. Easy to replace later because the cut-out is already sized.
• Integrated basin: moulded into the counter as one piece. Finished height equals cabinet plus counter, with no separate rim. Fewer seams, but the whole top must be replaced if damaged.

Homeowners often order a 750 mm cabinet expecting a low vanity, then add a vessel basin and end up taller than a standard 850 mm setup. Always ask the supplier for the finished height with the specific basin included.

How Basin Style Changes Usable Counter and Storage

The basin isn’t just a height variable, it consumes counter area and cabinet volume:

• Undermount: the counter runs edge to edge, so you keep the full surface for toiletries. The basin bowl hangs into the cabinet, which can reduce the depth of the top drawer.
• Inset: similar counter use to undermount, but the rim creates a small lip that catches water and debris.
• Integrated: counter and basin are one surface, so there’s no lip to clean, but the bowl depth is fixed and can’t be swapped.
• Vessel: the bowl sits on the counter, so you lose the footprint of the bowl from usable surface. A 400 mm wide vessel on a 900 mm counter leaves roughly 500 mm of usable counter, split either side.

Storage is affected too: a vessel basin frees cabinet space because the bowl sits on top, while an undermount basin takes up cabinet depth, often making the top drawer shallower.

Faucet Placement and Reach

Tap position depends on the basin:

• Undermount and inset: the tap drills through the counter behind the basin. Standard tap reach (usually 100-150 mm spout) works because the basin rim is at counter level.
• Integrated: the tap hole is moulded in, so you’re locked into the spacing the manufacturer provides.
• Vessel: the tap must be tall enough to clear the basin rim, often 200 mm or more above the counter. A standard short tap will hit the back of the bowl or splash outside it.

Check the tap spout reach against the basin centreline before ordering; if too short, water lands on the back rim instead of in the bowl.

Matching Height to the User

Standard height suits most adults, but adjust for who will actually use the vanity:

• Children or shorter adults: a 750 mm finished height reduces reach strain.
• Taller adults: 850-900 mm finished height is easier on the back.
• Aging in place or accessibility needs: 850 mm is a common compromise, and a wall-mounted vanity at 800-850 mm with clear floor underneath allows a seated approach.

Single versus Double Vanities: Making the Right Choice

A single vanity suits one person or a small bathroom, while a double vanity lets two people use the bathroom at once.

Single vanities range from 600 mm to 1,200 mm wide, fit most bathrooms, and cost less than double units.

Double vanities need at least 1,200 mm of wall space, according to Modern Bathroom’s 2026 Buying Guide. Most are 1,500-1,800 mm wide.

Consider your household:

• One person or occasional guest bathroom: single vanity (600-900 mm)
• Couple or small family: single vanity (900-1,200 mm) or double (1,500+ mm)
• Large family or shared ensuite: double vanity (1,500-1,800 mm)

Double vanities cost more and take up more wall space but eliminate morning conflicts.

Sizing Vanities for Small, Medium, and Large Bathrooms

Your bathroom size dictates what vanity dimensions work best.

Small bathrooms (under 4 square metres) need a vanity that doesn’t dominate.

Medium bathrooms (4-8 square metres) offer more flexibility.

Large bathrooms (over 8 square metres) handle a 1,500-1,800 mm double vanity comfortably, with room for deeper vanities (550 mm) or extra shelving.

Measure your floor space first (length × width) to see which vanity size range suits your room.

Common Mistakes to Avoid When Selecting Vanity Size

Many homeowners choose a vanity on looks alone, then struggle with the layout.

Measuring only width: Depth and height matter just as much.

Forgetting door swing: A vanity too close to the door blocks it from opening fully.

Overlooking storage needs: A shallow vanity or pedestal sink looks clean but offers no storage.

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Disclaimer

Contact Domenico (Dom) Crupi on 0425801005 or email info@wdcservices.com.au for further information.

Frequently Asked Questions

What size should my bathroom vanity be?

Vanity size depends on your available wall space, bathroom layout, and whether you need single or double basins. For small bathrooms, a 600-750 mm vanity works well; medium bathrooms suit 900-1200 mm; large bathrooms can accommodate 1200-1500 mm or larger. Measure your wall space, account for door swing and clearance, and check plumbing locations before deciding. A professional can help you optimise the fit for your specific layout.

How do I measure for a bathroom vanity?

Measure the wall where you plan to install the vanity from corner to corner or between obstructions. Record the width, then measure from the finished floor to any overhead obstacles. Check the distance from the wall to the opposite wall to ensure adequate clearance for opening doors and moving around the basin. Locate existing plumbing rough-ins and electrical outlets. Write down all measurements and confirm door swing space before ordering.

What is the standard bathroom vanity depth?

Standard bathroom vanity depth ranges from 450-550 mm. Most vanities are 500 mm deep, which balances usable counter space with bathroom circulation. Deeper vanities (up to 600 mm) offer more storage and counter space but reduce walkway width in smaller bathrooms. Shallower vanities (450 mm) free up floor space but limit counter and storage capacity. Choose based on your bathroom layout and how much depth your wall space allows.

How high should a bathroom vanity be?

Standard vanity height is 800-850 mm from the finished floor to the countertop. Some modern designs are 900 mm high for ergonomic comfort. Basin type affects finished height: undermount basins sit lower, while vessel basins (sitting on top of the countertop) add height. Consider the users’ heights and accessibility needs when selecting finished height. Measure from your finished floor level before ordering to confirm the height suits your space.