Toronto home additions from $400/sq ft —
one team from permits to final inspection

Every addition in Toronto goes through a zoning review before a building permit is issued. Most projects comply with existing zoning rules, but if your addition exceeds height, setback, or lot coverage limits, it may need a minor variance from the Committee of Adjustment — a process that typically adds a few months. We check your zoning situation early, before you've invested in a full design, so you know which path you're on from the start.

Most home additions in Toronto fall between $400 and $650 per square foot. The final cost depends on the size of the addition, the existing structure, foundation and structural work, exterior materials, interior finishes, and whether the new space includes a kitchen or bathroom. This range is a planning starting point, not a quote — after a site visit, we prepare a detailed estimate based on your home and your plans, so you know the real number before any work begins. See our Toronto renovation cost guide for detailed planning ranges.

Adding a second storey is typically the most involved type of home addition, and most projects in Toronto fall between $450 and $700 per square foot. The cost depends on the condition of the existing foundation and structure, the size of the new floor, roof and staircase work, mechanical and electrical upgrades, and the finishes you choose. Because the existing house carries the new floor, a structural review is part of the planning. After a site visit, we prepare a detailed estimate so you know the full cost before construction begins. See our Toronto renovation cost guide for detailed planning ranges.

Fair question — it's worth asking any contractor. We're licensed, insured for $5M, WSIB covered, and HomeStars verified, and we're happy to show you completed addition projects in your specific neighbourhood, not just kitchens or bathrooms, so you can see work comparable to what you're planning.

No — one project manager stays with you from your first call through the final walkthrough, including all permit coordination, trade scheduling, and inspections. You're not re-explaining your project to a new face every time something moves to the next phase.