How do I choose between renovating one large bathroom or splitting it into a full bath and a powder room?

Splitting a large bathroom into a full bath and a powder room is one of the highest-ROI renovation decisions you can make in a Toronto home — adding a half bath typically increases resale value by $15,000 to $25,000 in the current GTA market, which often exceeds the additional cost of the split. However, the decision depends on your existing plumbing layout, available space, and how your household actually uses the bathroom.

The math comes down to a practical question: is a single large bathroom serving your household well, or is there a daily bottleneck? In many GTA homes — particularly 3-bedroom semis, detached homes with growing families, and multi-generational households across Scarborough, North York, and Brampton — one bathroom shared by four or more people creates constant scheduling conflicts. A powder room on the main floor or near the bedrooms gives guests and family members access to a toilet and sink without tying up the full bathroom during shower time.

When Splitting Makes Sense

You have a bathroom that is 70 square feet or larger. A functional full bathroom (three-piece with shower, toilet, and vanity) needs a minimum of about 35 to 40 square feet, and a powder room (two-piece with toilet and small vanity) needs a minimum of about 16 to 20 square feet. If your current bathroom is large enough to carve out both spaces with code-compliant clearances — 15 inches from toilet centreline to the nearest wall, 21 inches clear space in front of the toilet, 21 inches in front of the vanity — the split is physically feasible.

You have only one bathroom in the home. Single-bathroom Toronto homes (common in bungalows, wartime houses, and older semis) benefit enormously from adding a second fixture location. Even a small powder room tucked under a staircase, in a hallway closet, or carved from a large bedroom corner changes daily life dramatically.

You are planning to sell within 5 years. In the GTA resale market, the jump from a one-bathroom to a two-bathroom home is one of the most significant value increases relative to cost. Buyers expect at least 1.5 bathrooms in a 3-bedroom home, and listings with only one bathroom sit longer and sell for less.

When Keeping One Large Bathroom Is Better

Your bathroom is under 60 square feet. Splitting a smaller bathroom creates two cramped, uncomfortable spaces that neither function well nor feel appealing. A well-designed 55-square-foot bathroom with smart storage and a good layout is worth more than two tiny rooms that feel like airplane lavatories.

You already have 2 or more bathrooms. If your home has an ensuite and you are considering splitting the main bath, the marginal value of a fourth fixture drops significantly. Invest in making the main bathroom beautiful rather than adding another toilet.

Cost Comparison

Renovating a single large bathroom in Toronto typically runs $25,000 to $40,000 for a mid-range to high-end finish. Splitting into two rooms adds $8,000 to $15,000 on top of that — the additional cost covers framing the dividing wall, a second plumbing rough-in (toilet and sink), additional electrical (light, fan, GFCI outlet), a second door, and finishing the powder room. You will need plumbing and building permits from the City of Toronto for the new fixture connections, and the plumbing rough-in must be inspected before walls are closed.

The key plumbing consideration is proximity to the existing drain stack. If the new powder room toilet can be positioned within 4 to 6 feet of the existing drain stack, the plumbing cost is manageable. Moving more than 6 feet away requires longer drain runs with proper slope (1/4 inch per foot for 3-inch toilet drains), which increases cost and complexity. Your plumber will assess feasibility during the quoting phase.

Get matched with a bathroom contractor who can evaluate your layout and provide options — Toronto Bath Remodeling connects you with experienced local professionals for free.