Project template
Your preparation checklist
Use it as a working list. The final submission still needs to match your actual scope and the City’s current requirements.
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What to do next
- Measure garage area and confirm one-storey/no-plumbing conditions
- Check zoning
- Prepare the site and construction drawings
- Submit if the exemption does not apply
Official sources behind this page
Small one-storey detached garageMay be permit-exempt below 15 m²
Ottawa states that qualifying one-storey detached accessory buildings ancillary to the principal dwelling can be exempt when under 15 m² and without plumbing.
City of OttawaDetached garages and sheds · Garage threshold, documents and first-review target
2026-10-01Open proof
Larger accessory buildingPermit required
Accessory buildings outside the exemption require a building permit under the City’s published guidance.
City of OttawaDetached garages and sheds · Garage threshold, documents and first-review target
2026-10-01Open proof
ZoningStill applies
Ottawa directs owners to confirm setbacks, height and lot coverage with Development Information.
City of OttawaDetached garages and sheds · Garage threshold, documents and first-review target
2026-10-01Open proof
Need the full project answer?
The main guide keeps the permit trigger, zoning questions, documents, fees, timing and next steps together.
Open the garage / carport guide