How do I choose between a single large vanity with double sinks and two separate vanities in a long narrow master bathroom?

In a long, narrow master ensuite, two separate vanities almost always outperform a single double-sink vanity — but the right answer depends on your bathroom's exact dimensions, plumbing layout, and how you and your partner actually use the space.

The core issue is that a long, narrow bathroom (typically 8 to 10 feet wide and 12 to 16 feet long in a GTA master ensuite) creates a corridor-like feel that a single large vanity can actually worsen. When you place a 72-inch or 84-inch double vanity on one wall, you end up with two people standing side by side at the same counter, competing for mirror space, drawer access, and elbow room — all while the long axis of the room goes underutilized. Two separate vanities, positioned on opposite ends of the long wall or even on opposing walls, distribute the activity zones and make the room feel wider and more intentional.

Plumbing is the biggest practical constraint. A single double-sink vanity requires two drain connections and two sets of supply lines, but they all originate from roughly the same wall location — one plumber visit, one rough-in zone, relatively straightforward. Two separate vanities on the same wall are similar in cost, maybe $300-$600 more for the additional drain and supply rough-in. Two vanities on opposite walls is a different story — you're now running supply lines and drains across the bathroom, which in a GTA home with a concrete basement floor or finished ceiling below means either opening up the floor or running exposed or bulkheaded supply lines. Budget an additional $1,500-$3,000 for that cross-room plumbing work, and confirm with your plumber whether your existing drain stack location makes it feasible before you fall in love with a layout on Pinterest.

The mirror and lighting question is where two separate vanities genuinely shine. With a single 72-inch vanity, you're typically working with one long mirror or a pair of mirrors centred over each sink — but the lighting is shared, which means one person applying makeup or shaving is always competing with the other for the best light angle. Two separate vanities allow each person to have their own dedicated mirror, their own sconce or vertical light fixture at face height, and their own electrical circuit if needed. In a GTA master ensuite renovation, this upgrade from shared to individual lighting is one of the details that separates a $25,000 renovation from a $35,000 one — and it's worth every dollar if two people are getting ready simultaneously on weekday mornings.

Storage distribution is the other major advantage of separate vanities. A 36-inch vanity per person gives each partner their own dedicated drawers, cabinet space, and counter area. No negotiating over whose products go where. In GTA homes where the master ensuite is the primary bathroom for the household, this practical separation of storage makes daily life noticeably smoother.

Dimensions to Work With

Before committing to either configuration, measure your bathroom carefully. You need a minimum of 21 inches of clear floor space in front of any vanity (24 inches is more comfortable and is what most designers recommend in the GTA market). If your bathroom is only 7 feet wide and you're placing vanities on both long walls, you'd have 84 inches of width minus two vanity depths of roughly 21 inches each — leaving only 42 inches of clear floor space between them, which is workable but tight. At 8 feet wide, you get 54 inches of clearance, which feels comfortable. At 9 feet or more, opposing vanities become genuinely luxurious.

For a single long wall configuration, a pair of 36-inch vanities with a gap of 6 to 12 inches between them (used for a linen tower, open shelving, or simply visual breathing room) often looks more intentional and custom than a single 72-inch unit. The gap also gives your plumber a natural chase space for supply lines if needed.

Cost Comparison in the GTA Market

A single semi-custom 72-inch double vanity with quartz top runs $1,800-$3,500 for materials. Two 36-inch semi-custom vanities with quartz tops run $1,200-$2,500 each — so $2,400-$5,000 total, but you gain the individual storage and lighting benefits. Custom floating vanities, which are the dominant choice in contemporary GTA master ensuite renovations right now, run $1,500-$4,000 per unit for a 36-inch size. The plumbing labour difference between the two configurations is modest unless you're crossing the room with new drain lines.

If you're planning a master ensuite renovation and want to talk through the layout with a local professional, Toronto Bath Remodeling can match you with bathroom renovation contractors in your area at no cost — find them through the Toronto Construction Network directory at torontoconstructionnetwork.com/directory?category=bathroom-renovations.