Ontario Design Studio prepares BCIN-certified permit drawings for decks, porches, and covered outdoor structures across Ontario and the GTA. Deck construction is one of the most common residential permit projects in Ontario - and one where many homeowners discover too late that a permit was required.
When Does a Deck Need a Permit in Ontario?
Under the Ontario Building Code, a building permit is required when:
- The deck is attached to the house (at any height)
- Deck surface is more than 600mm (24 inches) above finished grade
- Deck area exceeds 10 square metres (108 sq ft)
- The deck is covered - pergola with solid roof, screened enclosure, or sunroom
- The deck includes a hot tub, pool, or structural spa
- The deck extends over a walkout basement or ravine
If you're not sure whether your deck needs a permit, contact us for a free assessment. Read our guide on which renovations need a permit in Ontario.
Ready to start your project?
Ontario Design Studio delivers BCIN-certified, OBC-compliant building permit drawings across Ontario and the GTA. Call 416-558-9607 or request your free quote.
Our Deck Permit Drawing Package
- Site plan with deck location, dimensions, and all property line setbacks to scale
- Deck floor plan showing joist spacing, beam layout, and post locations
- Structural details for footings, post-to-beam connections, and ledger board attachment
- Guard and stair details per OBC - including height, spacing, and load requirements
- Cross-sections showing height above grade and structural assembly
- Schedule 1 designer information form
Deck Permits by City
Related Resources
- Building Permit Drawing Cost Guide
- How the Ontario Permit Process Works
- Home Addition Permit Checklist
Frequently Asked Questions
When does a deck need a building permit in Ontario?
A building permit is required in Ontario when: the deck is attached to the house (any height), the deck surface is more than 600mm (24 inches) above finished grade, the deck area exceeds 10 square metres (108 sq ft), the deck has a solid roof or screened enclosure, or the deck supports a hot tub or pool.
How much does a deck permit cost in Ontario?
BCIN designer fees for deck permit drawings typically range from $1,000 to $2,500 depending on deck size and complexity. Municipal permit fees are additional and are based on the estimated construction value.