What Size Bathroom Vanity Do I Need? A Measuring Guide

Ordering a vanity that doesn't fit is a nightmare: shipping it back is expensive, you're left without a sink, and the installation has to be rescheduled. This guide walks you through exactly how to measure your bathroom so you order the right size the first time — whether you're replacing an existing vanity or starting from a rough-in.

How Do I Measure My Bathroom for a New Vanity?

You need four measurements before you look at a single vanity listing.

1. Available width: Measure the width of the space where the vanity will sit. If you're replacing an existing vanity, measure the opening left behind. If you're working with an open wall, measure from the wall corner (or any obstruction) to the nearest door frame, toilet, or obstacle. Subtract at least 2 inches from this number to give yourself installation and clearance buffer.
2. Available depth: Standard vanity depth is 18–21 inches. Measure from the wall to any obstruction in front of the vanity space (door swing radius, toilet edge, bathtub). You need at least 21 inches of clear floor space in front of the vanity — 30 inches is the comfortable minimum by most building codes.
3. Height: Standard vanity height is 32–36 inches. "Comfort height" vanities at 36 inches are increasingly popular because they match standard kitchen counter height and are easier on the back. Measure your existing rough-in height if replacing.
4. Plumbing rough-in location: Measure from the wall to the centre of the drain pipe and the hot/cold supply lines. This affects both vanity depth selection and whether you need a centre-set or widespread faucet configuration.

What Are the Clearance Requirements for a Bathroom Vanity?

Canadian building codes (based on NBC 2020) and practical usability set these minimums:

• In front of the vanity: 21 inches minimum clear floor space; 30 inches recommended for comfortable use
• Between vanity and toilet: 15 inches minimum from the vanity edge to the toilet centerline; 18 inches is comfortable
• Between vanity and wall/obstacle on the side: No hard code minimum, but 6 inches gives you room to open doors and drawers fully
• Door swing: If a bathroom door swings toward the vanity, make sure the door clears the countertop edge with the door fully open. This catches people off guard constantly.

What Vanity Size Is Right for a Powder Room?

A powder room (toilet + sink only, no shower or tub) is typically the smallest bathroom in the home. The vanity needs to be functional without dominating the space.

Recommended sizes: 24-inch or 30-inch vanities. In a very tight powder room (under 35 square feet), a 24-inch vanity is often the only option that leaves adequate clearance. In a standard powder room (35–50 square feet), a 30-inch fits well and gives much more counter and storage space.

Avoid: vessel sinks in powder rooms with low ceilings — the combined height can feel cramped and the faucet clearance becomes awkward.

What Vanity Size Is Right for a Standard Bathroom?

A standard full bathroom (toilet + sink + tub/shower combo) in a typical GTA home or condo is usually 50–80 square feet. Most have a 5-foot (60-inch) wide wall for the vanity or a shorter alcove.

Recommended sizes: 30-inch, 36-inch, or 48-inch depending on wall space. The 36-inch is the sweet spot — enough counter space to be genuinely functional, but scaled appropriately for a single-sink main bath. If you have the wall space, a 48-inch single-sink gives you luxurious counter space without the plumbing complexity of a double sink.

What Vanity Size Is Right for a Master Ensuite?

Master ensuites are where you can go bigger — and usually should. If you're sharing the bathroom with a partner, a double-sink vanity transforms the morning routine.

Recommended sizes: 60-inch double-sink if the wall space allows. Most master ensuites in GTA homes built after 2000 have 60–72 inches of vanity wall space. A 60-inch double vanity fits two people comfortably and adds significant resale appeal — it's one of the first things buyers notice in a primary bathroom.

If you're limited to 48 inches or less, a single 48-inch vanity with a wide, deep sink is often more practical than squeezing in a cramped double.

How Does Plumbing Affect Vanity Size Choice?

Your existing plumbing rough-in is the hardest constraint to work around. Moving drain pipes means opening the floor — that's a $500–$1,500 plumbing job before you even buy the vanity.

• If the drain is centred on the wall, most standard vanities will work.
• If the drain is off-centre, choose a vanity where the drain location aligns with the cabinet's internal layout. Most single-sink vanities accommodate a drain anywhere from 8–18 inches from either side wall of the cabinet.
• Supply lines (hot and cold) need to come up inside the cabinet base or through a cabinet back that you can drill. Measure their location and make sure the vanity cabinet base allows access.

Still not sure? Bring your measurements into our Markham showroom or send them to our team — we'll tell you exactly which vanities from our full collection will work in your space.