How much does it cost to add a second bathroom to my Ottawa home?

Adding a second bathroom to your Ottawa home typically costs between $15,000 and $35,000, depending on location, size, and finishes. The wide range reflects whether you're converting existing space versus adding new square footage, plus your choice of fixtures and materials.

Location is the biggest cost factor in bathroom additions. Converting an existing bedroom or large closet runs $15,000-$25,000 since the structural work is minimal. However, if you're adding square footage with a true addition, costs jump to $25,000-$35,000+ due to foundation work, exterior walls, and roofing. In Ottawa's climate, exterior additions require proper insulation and vapor barriers to handle our temperature swings from -30°C to +35°C.

Plumbing accessibility drives the second major cost variable. If you can tie into existing plumbing lines nearby (like stacking above or adjacent to your current bathroom), you'll save significantly on rough-in costs. Running new supply and drain lines across the house, especially in finished spaces, adds $3,000-$6,000 to the project. In older Ottawa homes with cast iron drains, this sometimes means partial basement ceiling removal and restoration.

Electrical and ventilation requirements under the Ontario Building Code add another layer of costs. You'll need dedicated 20-amp circuits for bathroom outlets, proper GFCI protection, and adequate exhaust ventilation (minimum 50 CFM fan). The Electrical Safety Authority requires permits for this work - budget $800-$1,500 for electrical rough-in and ESA inspection fees.

Permit costs in Ottawa range from $500-$1,200 depending on scope. Simple bathroom additions usually qualify for a minor building permit, while additions requiring structural changes need full permits with 2-4 week processing times. The City of Ottawa requires detailed drawings showing plumbing, electrical, and ventilation plans.

Finish level dramatically impacts your final cost. Basic contractor-grade fixtures, vinyl flooring, and standard vanities keep you toward the lower end. Mid-range finishes with ceramic tile, quality vanities, and name-brand fixtures hit the middle range. High-end materials like natural stone, custom millwork, and premium fixtures push toward $35,000+.

Timeline considerations are important for Ottawa homeowners. Interior bathroom additions can proceed year-round, but exterior additions are best started in spring/summer to avoid winter concrete and excavation limitations. Most bathroom additions take 3-4 weeks once permits are approved.

For a detailed estimate based on your specific home layout and preferences, contact Justyn Rook Contracting for a free consultation. We'll assess your plumbing accessibility, structural requirements, and help you maximize value within your budget.