In-law suite cost Ontario — finished basement secondary suite with separate entrance
Planning & Financial Guidance

In-Law Suite Cost Ontario: Your Complete 2026 Guide

Planning & Financial Guidance /

In-law suite cost in Ontario ranges from $50,000 for a basic basement conversion to $350,000 or more for a detached addition with full code compliance. Most Ontario homeowners budget $70,000 to $150,000 for a basement unit,