Do I need a building permit in Ontario? A plain-English guide

When your home project needs a permit in Ontario, when it doesn’t, and why a permit protects you — not just the municipality.

Permits feel like red tape until you sell the house and a buyer’s lawyer asks about that basement bathroom. Here’s a plain-English guide to when Ontario projects need one — and why it’s worth it.

Usually needs a permit

• Structural changes — removing or moving a load-bearing wall, additions, decks over a set height.
• New or relocated plumbing and most electrical work (electrical also involves ESA).
• Finishing a basement into living space, adding a bedroom (egress), or a secondary suite.
• Changing the building’s footprint or use.

Usually doesn’t

• Painting, flooring, and cosmetic finishes.
• Like-for-like fixture swaps that don’t move plumbing.
• Cabinet and countertop replacement in the same layout.

Rules vary by municipality, so this is a guide, not a ruling — your contractor confirms and pulls the permit.

Why it protects you

• Inspections catch unsafe work before it’s hidden behind drywall.
• Unpermitted work can stall a sale or void insurance after a claim.
• It keeps the responsibility — and the paperwork — with a licensed pro.

The HomeCopilot planner flags likely permit needs while you plan, and every matched pro handles the application and inspections. Start by describing your project.