What's the best layout for a narrow rectangular bathroom?

The best layout for a narrow rectangular bathroom places all fixtures along one long wall or staggers them on opposite walls to maximize floor space and sightlines. In the GTA, narrow bathrooms are extremely common — particularly in Toronto's pre-war homes, post-war bungalows across Scarborough and North York, and modern condo units where floor plans squeeze bathrooms into tight footprints.

The most effective approach for a narrow bathroom (typically 5 feet wide by 8–10 feet long) is the single-wall layout, where the toilet, vanity, and shower or tub are arranged along one wall. This keeps the opposite wall clear, creating an uninterrupted walkway that makes the space feel wider than it is. The toilet typically sits between the vanity and the shower, with the vanity closest to the door. If your bathroom is wide enough (at least 60 inches), you can consider a galley layout with the vanity on one wall and the toilet and shower on the opposite wall — this works well when plumbing rough-ins are already positioned on both sides.

Key Measurements for Narrow Bathrooms

Ontario Building Code requires a minimum of 15 inches from the toilet centreline to any side wall or obstruction, and 21 inches of clear space in front of the toilet (24 inches is recommended for comfort). In a narrow bathroom, these clearances dictate everything. Before committing to a layout, measure your rough-in dimensions — the distance from the wall to the toilet drain centre (typically 12 inches in most GTA homes) and the locations of your existing supply and drain lines.

A wall-mounted vanity is one of the best investments in a narrow bathroom. Floating the vanity off the floor at 30–34 inches creates visible floor space beneath it, which tricks the eye into perceiving a larger room. A 24-inch or 30-inch wall-mounted vanity with a single undermount sink costs $800–$2,500 installed in the GTA and makes a dramatic difference in a tight space. Pair it with a wall-mounted faucet ($300–$800 installed) to eliminate the faucet deck and gain usable counter space.

Shower and Door Strategies

For the shower, a curbless shower at the far end of the narrow bathroom is ideal — it eliminates the visual barrier of a shower curb and door frame, making the room feel continuous. A frameless glass panel (rather than a full enclosure) costs $800–$1,500 for the glass alone and keeps sightlines open. If a curbless shower isn't feasible due to floor structure limitations, a sliding glass door on a standard shower base avoids the swing clearance problem that hinged doors create in narrow spaces.

Replace a standard swing door with a pocket door ($400–$800 installed) or a barn door ($300–$600 installed). A swing door in a narrow bathroom eats 7–9 square feet of usable space every time it opens. A pocket door reclaims all of that space and is one of the highest-impact changes you can make in a tight GTA bathroom.

Visual Tricks That Work

Use large-format porcelain tile (12x24 or 24x24) laid horizontally on the walls — fewer grout lines create a sense of width. Light, neutral colours reflect more light and make the space feel open. A full-width mirror above the vanity (wall-to-wall rather than a framed mirror) visually doubles the room width. Recessed medicine cabinets, recessed shower niches, and recessed toilet paper holders keep everything flush with the walls, preserving every inch.

For lighting, recessed pot lights (4-inch LED, $150–$250 each installed) eliminate the visual bulk of hanging fixtures and keep the ceiling clean. A backlit mirror ($200–$600) provides task lighting without a protruding vanity light bar.

If your narrow bathroom needs a full layout redesign involving plumbing relocation, expect to budget $25,000–$35,000 for a mid-range renovation in the GTA, including permits from the City of Toronto Building Division for any plumbing modifications. A cosmetic refresh that works within the existing layout runs $15,000–$22,000. Either way, getting the layout right in a narrow bathroom is worth spending time on — you will live with these decisions every day.