Home addition costs vary widely depending on the type of addition, size, materials, and complexity. Here’s a detailed look at common types of additions and their typical price ranges in Toronto for 2026:

Discover why 416 Construction is recognized as one of Toronto’s premier architectural drawing firms, offering expert design, permit-ready plans, engineering coordination, and complete design-build services. Learn how our experienced team transforms ideas into fully approved, buildable projects across Toronto and the GTA.

Building a custom home in Toronto is one of the biggest investments you’ll ever make, but most people don’t actually know what it costs or where the money goes. In this guide, we break down the real cost per square foot, land prices, permits, and the hidden costs most builders don’t talk about, so you can plan your build the right way.