Can I build a coach house in my backyard in Ottawa?

Yes, you can likely build a coach house (also called a garden suite or laneway house) in your backyard in Ottawa, but it depends on your specific zoning and lot requirements.

The City of Ottawa updated its Zoning By-law in recent years to allow secondary dwelling units, including detached coach houses, in most residential zones. However, there are specific requirements you must meet before proceeding.

Zoning and Lot Requirements

Your property must be in a zone that permits secondary dwelling units. Most R1, R2, R3, and R4 residential zones now allow them, but you'll need to verify your specific zoning designation. Your lot must also meet minimum size requirements - typically at least 450 square meters (about 4,840 square feet) with sufficient setbacks from property lines.

The coach house cannot exceed 40% of the floor area of your main dwelling or 90 square meters (about 970 square feet), whichever is smaller. Height restrictions typically limit coach houses to 2.5 stories or about 10 meters maximum.

Permit Process in Ottawa

You'll need a building permit from the City of Ottawa Building Code Services (613-580-2424). This is considered a major renovation/addition project, so expect the permit process to take 6-12 weeks and cost $1,500-$5,000+ depending on the size and complexity.

Before applying for your building permit, you may need a minor zoning variance or site plan approval if your lot doesn't meet all standard requirements. Contact ottawa.ca/building or visit their office to discuss your specific property.

What You'll Need

The permit application requires detailed architectural drawings, site plans showing setbacks and drainage, structural engineering reports, and proof that parking requirements are met (typically one additional parking space required). You'll also need to demonstrate adequate water, sewer, and electrical capacity.

Contractor Requirements

Any contractor you hire must be properly licensed and insured. For electrical work, ensure they're a Licensed Electrical Contractor (LEC) through ESA - verify at esasafe.com/contractor-locator. For gas connections, your contractor needs TSSA certification - check at tssa.org. Always verify WSIB coverage at wsib.ca/clearances.

Cost Expectations

Coach house construction in Ottawa typically ranges from $80,000-$200,000 depending on size, finishes, and site conditions. Remember to hold back 10% of payments until 60 days after substantial completion as required under Ontario's Construction Lien Act.

Red Flags to Avoid

Be wary of contractors who say permits aren't needed or offer to "handle everything" without showing you the actual permits. Always verify permits are pulled in your name, not just the contractor's.

Start by calling City of Ottawa Building Code Services at 613-580-2424 or visiting ottawa.ca/building to confirm your property's eligibility and get the current application requirements for your specific situation.