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

Yes, you can potentially build a coach house (also called a garden suite or laneway house) in your backyard in Ottawa, but it depends on your specific property's zoning and several City requirements.

The City of Ottawa allows secondary dwelling units in various forms, including detached coach houses, but the rules are quite specific. Your property must be zoned to permit this type of development - typically in residential zones that allow secondary dwelling units. The coach house must meet setback requirements from your property lines, height restrictions (usually maximum 2.5 stories), and lot coverage limits.

Key Ottawa Requirements for Coach Houses:

Your lot size matters significantly - you'll need adequate space to meet setback requirements while maintaining the primary dwelling. The coach house cannot exceed the floor area of your main house, and there are parking requirements (typically one space per unit). The structure must have independent access and cannot share utilities connections in most cases.

Ottawa Permit Process:

You'll need to start with a zoning compliance review through the City of Ottawa Building Code Services (613-580-2424). This determines if your property can legally support a coach house. If compliant, you'll need a full building permit, which for a secondary dwelling unit typically takes 6-12 weeks and costs $1,500-$5,000+ depending on the size and complexity.

The permit application requires detailed architectural drawings, site plans showing setbacks, servicing plans for water/sewer/electrical, and often a Committee of Adjustment application if any minor variances are needed.

What to Watch For:

Many Ottawa homeowners assume they can build a coach house without checking zoning first - this is a costly mistake. Some neighborhoods have additional heritage or design restrictions. Also, be aware that coach houses require separate ESA electrical permits and potentially TSSA gas permits if you're adding gas service.

Working with Contractors:

This is a complex project requiring an architect or designer familiar with Ottawa's secondary dwelling unit requirements, plus contractors experienced with these builds. Verify any contractor through ESA licensing (esasafe.com) for electrical work and ensure they have WSIB clearance and proper insurance for a project of this scope.

Official Resources:

Contact City of Ottawa Building Code Services at 613-580-2424 or visit ottawa.ca/building for the Secondary Dwelling Unit guide. The zoning department can provide a preliminary review of your property's eligibility before you invest in detailed plans.