What Does a Legal Basement Suite Cost in Ontario?
Building a legal basement suite (also called a secondary suite or accessory dwelling unit) in Ontario is one of the best investments a homeowner can make. As of 2026, costs typically range from $45,000 to $120,000+, depending on the size, finishes, and existing conditions.
Cost Breakdown
Here's what you can expect for a typical 600–800 sq ft basement suite in Brantford, Kitchener, or the surrounding area:
- Permits & Engineering: $2,000–$5,000
- Framing & Insulation: $5,000–$10,000
- Plumbing (kitchen + bathroom): $8,000–$15,000
- Electrical (separate panel + fixtures): $5,000–$10,000
- HVAC / Heating: $3,000–$8,000
- Egress Windows & Window Wells: $3,000–$6,000
- Flooring: $3,000–$7,000
- Kitchen Cabinets & Appliances: $5,000–$15,000
- Bathroom Finishes: $4,000–$10,000
- Drywall, Paint & Trim: $4,000–$8,000
- Fire Separation & Smoke/CO Detectors: $2,000–$5,000
- Separate Entrance: $3,000–$8,000
Ontario Building Code Requirements
To be legal, your basement suite must meet the Ontario Building Code (OBC) requirements including: minimum ceiling height of 6'5" (1.95m), proper fire separation between units (fire-rated drywall), egress windows in every bedroom (minimum 3.8 sq ft opening), separate entrance, smoke and CO detectors, and proper ventilation.
Permit Process
In Brantford and most Ontario municipalities, you'll need a building permit. The process typically takes 2–4 weeks for approval. Your contractor should handle the permit application, drawings, and inspections.
Return on Investment
A legal basement suite in Brantford can generate $1,200–$1,800/month in rental income. At an average build cost of $75,000, you're looking at a payback period of approximately 4–5 years — plus your property value increases by $50,000–$80,000 immediately.
Why Choose Build My Home Ltd?
We've completed dozens of legal basement suites in Brantford, Kitchener, Waterloo, and Cambridge. We handle everything from permits to final inspection, ensuring your suite is 100% code-compliant. Call us at 204-205-2064 for a free estimate.