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Ottawa deck permits

Do you need a permit for a deck in Ottawa?

Check Ottawa deck permit triggers, the 600 mm rule, detached-deck area threshold, application documents, inspections and official City sources.

2 min readReviewed Oct 1, 2026
The short answerConditional

A permit is required for several elevated-deck situations, including an attached or adjacent deck with a walking surface more than 600 mm above grade.

Ottawa distinguishes attached or adjacent decks, principal-access decks and independent decks. Height, area and how the deck relates to the building can change the permit answer.

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Know what matters

What changes the answer.

Start with these conditions. The official reference is attached to each one.

Attached / adjacent deckPermit required above 600 mmConditional

Ottawa states that an attached or adjacent deck with a walking surface more than 600 mm (24 in.) above adjacent grade requires a permit regardless of walking-surface area.

Official sourceCity of OttawaDecks — Do I need a building permit? · Permit triggers, application documents and inspections
Verified2026-10-01Open proof
Principal accessPermit required for elevated principal accessConditional

An elevated deck providing principal access to a building requires a permit regardless of walking-surface area.

Official sourceCity of OttawaDecks — Do I need a building permit? · Permit triggers, application documents and inspections
Verified2026-10-01Open proof
Independent deckHeight and area both matterConditional

For an independent deck, Ottawa identifies a permit trigger when the walking surface is more than 600 mm above grade and the area is greater than 10 m².

Official sourceCity of OttawaDecks — Do I need a building permit? · Permit triggers, application documents and inspections
Verified2026-10-01Open proof

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Preparation checklist · Reviewed 2026-10-01

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Fees and timing

TimelineConfirm the current review stream and application status with Ottawa Building Code Services.
FeesUse Ottawa’s current applicable-fee schedule for the proposed deck permit.

Next steps

  1. Measure the deck height above adjacent grade
  2. Confirm whether it is attached, adjacent, principal access or independent
  3. Measure the walking-surface area
  4. Prepare the City’s required plans and submit through the current Ottawa portal

A few questions you might have.

Does every low deck in Ottawa need a permit?

No. Ottawa lists some decks below 24 inches above grade as permit-exempt, subject to the stated exceptions and other applicable rules.

Are inspections part of a permitted deck project?

Yes. Ottawa lists foundation, framing and final inspections among the inspections that can apply to deck construction.

Same project, different city

See how this rule changes across Ontario.

Compare the source-reviewed answer for this project across every municipality BuildRules currently covers.

Compare deck rules by city

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Send this to your designer or contractor before agreeing on the scope.

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