Cost Per Square Foot to Build Garden Suite or Lane way house in Toronto (2025 Guide)

When planning a garden suite or laneway home in Toronto, the cost varies based on size, number of stories, and whether a basement is included. Below is the estimated cost per square foot based on the footprint of the structure. Garden Suite & Laneway House Pricing Breakdown Type of Suite Estimated Cost Typical Footprint (sq. ft.) Estimated Cost per sq. ft. 1-Story Garden Suite $250,000 ~600 – 800 sq. ft. $310 – $415/sq. ft. 2-Story Garden Suite $300,000 – $350,000 ~800 – 1,000 sq. ft. $300 – $440/sq. ft. 1-Story + Basement $300,000 – $350,000 ~600 – 800 sq. ft. $375 – $580/sq. ft. 2-Story + Basement $400,000 – $440,000 ~800 – 1,000 sq. ft. $400 – $550/sq. ft. Factors That Influence Cost Per Square Foot ✔ Luxury Finishes & Custom Features – High-end kitchens, custom cabinetry, and modern design impact pricing. ✔ Basement Inclusion – Adds structural complexity and increases foundation costs. ✔ Energy Efficiency & Smart Home Tech – Solar panels, high-performance insulation, and automated systems affect pricing. ✔ Site Conditions & Permits – Lot preparation, zoning regulations, and permit fees vary in different Toronto neighborhoods. Get a Custom Quote for Your Garden or Laneway Suite Every laneway home or garden suite is unique. Contact Royal Castles for a personalized, no-obligation estimate based on your specific needs, finishes, and design preferences. Let’s bring your secondary suite vision to life! 🚀