Short answer: many decks in Toronto need a building permit, especially decks that are raised off the ground, attached to the house, large, or have a roof. Rules can change, so always confirm with the City of Toronto (or your local municipality) before you build.
Building without a required permit can cause problems with insurance, inspections and when you sell your home. Here is what usually decides whether you need one, and how to plan a deck that passes inspection.
What usually decides whether a permit is needed
- Height: decks raised above a set height from the ground generally need a permit.
- Attachment: decks attached to the house are treated differently from free-standing decks.
- Size: larger decks are more likely to need approval.
- Roofs, walls and hot tubs: these can change the requirements.
- Zoning: setbacks from property lines and lot-coverage limits also apply.
Check the current rules on the City of Toronto website or with your municipality’s building department before you start.
Why footings matter at inspection
Inspectors pay close attention to footings: depth below the frost line (about 4 feet / 1.2 m in the Toronto area), size and spacing. Strong footings are the most important part of a safe, level deck.
Citywide installs code-ready deck posts and footings and helical piles for decks. Not sure which footing to use? Read helical piles vs sonotubes.
Checklist before you build
- Get a simple drawing with deck size, height and footing locations.
- Request utility locates through Ontario One Call before any digging.
- Confirm property lines and any easements.
- Keep permit documents and inspection records for when you sell.
Frequently asked questions
Do ground-level decks need a permit?
Low, free-standing decks often have simpler rules, but it depends on size and location on the lot. Confirm with your municipality.
Does replacing deck boards need a permit?
Replacing boards on an existing deck usually does not, but rebuilding the structure or changing its size or height may. Check before you start.
Can a contractor help with the permit?
Yes. Your deck builder can help prepare the drawings and details the city asks for.
Plan your deck the right way
Planning a new deck? Get a quote from our deck builders or call 416-721-9971. We will check what your project needs before we start.