Do I need an architect for a Toronto addition?

For most residential additions in Toronto, you don't necessarily need a licensed architect — but you do need professionally prepared drawings that comply with the Ontario Building Code, and for larger or more complex projects, an architect or engineer is strongly recommended.

The City of Toronto requires permit drawings for any addition, and those drawings must demonstrate OBC compliance. For straightforward single-storey additions under roughly 600 sq ft, many homeowners use a residential designer (also called a home designer or draftsperson) rather than a licensed architect. These professionals can produce permit-ready drawings at a lower cost, and they're perfectly capable of handling typical kitchen extensions, sunrooms, or bedroom additions on a standard lot.

That said, the complexity of your project matters a great deal. If your addition involves structural changes (removing load-bearing walls, spanning large open spaces, or adding a second storey), your drawings will need to be reviewed and stamped by a licensed structural engineer regardless of who does the architectural drawings. Engineers typically charge $1,500–$4,000 for residential structural work in the GTA, depending on scope.

When a licensed architect makes sense is when your project is large, involves significant design complexity, sits on a challenging lot (ravine lots, narrow infill lots, heritage-designated properties), or requires a Committee of Adjustment hearing for a minor variance. Architects are also valuable if you want design expertise beyond just code compliance — they can help maximize space, light, and long-term value. Expect architectural fees in Toronto to run 8–15% of construction cost for full-service, or flat fees starting around $5,000–$15,000 for drawing-only services on a typical addition.

Typical Toronto Addition Drawing Costs

• Residential designer/draftsperson: $2,000–$6,000 for permit drawings
• Architect (drawings only): $5,000–$15,000+
• Structural engineering stamp: $1,500–$4,000 (usually required regardless)

Toronto Building permits for additions typically take 6–12 weeks for approval. You'll submit through the City's online portal at toronto.ca/building, and your designer or architect can usually handle the submission on your behalf.

One important local note — if your property is in a heritage conservation district (parts of Cabbagetown, The Annex, Roncesvalles, etc.), the City may require additional heritage review, and having an architect familiar with heritage guidelines becomes much more valuable.

Your next step is to sketch out what you're hoping to build and consult with both a residential designer and a contractor early in the process. Many contractors can refer you to designers they've worked with successfully. You can browse licensed professionals in our directory at the Toronto Construction Network to find contractors and designers experienced with Toronto additions.