Multigenerational home design Ontario projects typically take one of four forms: an interior in-law suite, a basement secondary suite, a detached garden suite or laneway house, or a second-storey addition.
Home builders Mississauga homeowners hire should be HCRA licensed, Tarion registered, and experienced with local zoning across neighbourhoods like Port Credit, Lorne Park, and Erin Mills. The best custom home builders Mississauga offers combine
For most Ontario homeowners in 2026, renovation costs $100–$300 per square foot and works well when the structure is sound. A rebuild runs $275–$450 per square foot but delivers a fully code-compliant, energy-efficient home.
A 2nd storey addition cost in Ontario ranges from $375 to $550 per square foot in 2026, with Toronto and GTA projects often reaching $400–$700+. For a standard 800–1,000 sq ft second storey, total costs including permits and engineering typically fall between $280,000 and $550,000.
A 2nd floor addition permit in Toronto is a necessary approval from the City for adding a new storey to your home in 2026. You must provide engineered plans, pay fees, and pass City review and inspections.
Home addition cost in Toronto sits between $350 and $550 per square foot in 2026. A single room addition starts around $60,000, a rear extension runs $150,000 to $300,000, and a full second-storey addition can reach $500,000 or more.
An in law suite addition Ontario 2026 typically costs between $40,000 for a basic basement or garage conversion and over $400,000 for a detached garden suite. Permit requirements, building code Ontario compliance, and suite design influence both cost and legality
The sunroom and room addition cost Ontario 2026 ranges from $15,000–$50,000 for a basic 3-season sunroom, while four season sunrooms start around $35,000 and can exceed $180,000. Regular home extensions, such as family rooms, generally cost $350–$650 per square foot.
Luxury home remodeling is the process of upgrading a home with high end materials, custom designs, and advanced technology to achieve superior comfort, style, and value.
The average house addition cost in Ontario in 2026 ranges from $350 to $500 per square foot, with Toronto projects often exceeding $650. Prices depend on factors like type, size, finishes, and location.
