Do I need a permit to build a deck in Ottawa?

Yes, you need a building permit to build a deck in Ottawa if it's more than 24 inches (60 cm) above grade or attached to your house. The City of Ottawa requires permits for most deck construction to ensure safety and code compliance.

When You Need a Permit in Ottawa

You'll need a building permit for decks that are:

• More than 24 inches above the ground at any point


• Attached to your house (regardless of height)


• Over 108 square feet (10 square meters) in area


• Supporting a roof structure or hot tub

The only decks exempt from permits are small, low ground-level decks under 24 inches high that aren't attached to the house and are under 108 square feet.

Ottawa Permit Process and Costs

Building permits for decks in Ottawa typically cost between $150-400 depending on the deck size and complexity. The permit process usually takes 10-15 business days for straightforward deck applications. You can apply online through the City of Ottawa's building portal at ottawa.ca/building or visit their offices.

To apply, you'll need detailed plans showing deck dimensions, materials, footings, railings, and how it connects to your house. The plans must show compliance with the Ontario Building Code, including proper spacing for deck boards, railing heights (42 inches minimum), and footing depths below the frost line.

What Inspections Are Required

Once your permit is approved, you'll need at least two inspections: a footing inspection before pouring concrete, and a final inspection before the deck can be used. The inspector will verify that railings are secure, footings are adequate, and all work meets Ontario Building Code requirements.

Red Flags When Hiring Deck Contractors

Be cautious of contractors who say "you don't need a permit for this deck" when you clearly do, or who offer to build without permits to save money. This puts you at risk for safety issues and problems when selling your home. Always verify that your contractor will pull proper permits and arrange required inspections.

Make sure any contractor you hire has WSIB coverage and liability insurance. You can verify WSIB clearance at wsib.ca/clearances. For deck construction, while specialized licensing isn't required like with electrical or gas work, ensure your contractor is experienced with Ottawa's soil conditions and frost line requirements.

Getting Started

Contact City of Ottawa Building Code Services at 613-580-2424 or visit ottawa.ca/building to confirm permit requirements for your specific deck project. Each property and deck design can have unique considerations, especially in Ottawa's varying neighborhoods from Kanata to Orleans, where soil conditions and setback requirements may differ.

The permit fee is a small investment compared to the cost of having to rebuild a non-compliant deck or facing issues during a home sale.