What Is the Average ADU Cost in Toronto and GTA and What ROI to Expect ?
In 2026, the cost to build an ADU in Toronto typically ranges between:
- Basement Conversions: $80,000 – $180,000 *
- Garage Conversions: $120,000 – $250,000
- Garden Suites / Laneway Homes: $200,000 – $450,000+
Final costs heavily depend on:
- Size (square footage)
- Foundation requirements
- Utility connections
- Structural modifications
- Finish selections
- Site access constraints
- Permit and inspection requirements
Every property is unique. That’s why accurate pricing starts with approved permit drawings.
But the More Important Question Is… What’s Your ROI?
Cost matters — but return on investment matters more.
An ADU is not just an expense; it’s an income-generating asset. Rental income, mortgage offset, increased property value, and long-term appreciation all factor into your real return.
To understand whether your project makes financial sense, you need to calculate the ROI
Depending on your build type and rental rate, ADUs in Toronto or GTA it can generate strong double-digit annual returns.
Check out our detailed blog post explaining ADU ROI scenarios and what you can realistically expect in today’s GTA market.
