Source-reviewed city index
Common residential permit questions for Ottawa, organized by project. Open any row to see the conditions, official evidence and property-specific limitations behind the answer.
Latest represented review
Oct 1, 2026
A permit answer can still depend on dimensions, use, plumbing, structural work, zoning or the exact property. BuildRules keeps those conditions visible instead of reducing the rule to a false green-or-red score.
Do you need a permit to finish a basement in Ottawa?
Ottawa’s finished-basement route requires a building permit for regulated alteration work and publishes a 5-business-day first-review target.
1 official source
Do you need a permit for a deck in Ottawa?
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.
1 official source
Do you need a permit for a detached garage in Ottawa?
A qualifying one-storey detached garage ancillary to a dwelling can be permit-exempt below 15 m²; larger accessory buildings generally require a permit.
1 official source
Do you need a permit for a home addition in Ottawa?
Yes. Ottawa identifies additions as building-permit work and gives examples including sunrooms, attached garages, porches and one- or two-storey additions.
1 official source
When do you need a plumbing permit in Ottawa?
Ottawa lists alterations, additions and extensions to a plumbing system as permit-required work, except replacement of existing fixtures.
2 official sources
Do you need a permit to replace asphalt shingles in Ottawa?
Ottawa lists installing asphalt shingles on a roof among projects that do not require a building permit.
1 official source
Do you need a permit for a secondary dwelling unit in Ottawa?
A building permit is required when the new unit includes specified construction such as an addition, enlarged window, new exterior door or new internal shared entrance; some basement-apartment cases may require only a plumbing permit.
1 official source
Do you need a permit for a shed in Ottawa?
A qualifying one-storey detached storage shed up to 15 m² can be permit-exempt. Other accessory buildings can have a lower 10 m² permit threshold.
2 official sources
Do you need a permit for window or door changes in Ottawa?
Ottawa lists new windows, enlarged windows and relocated window or door openings as building-permit work.
1 official source