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
- Define every construction change
- Confirm whether the scope triggers a building permit, plumbing permit or both
- Review the property and plan with the City
- Submit the applicable permit package before construction
Official sources behind this page
Specified constructionBuilding permit required
Ottawa lists additions, enlarged windows, new exterior doors and new internal shared entrances as building-permit triggers for a new secondary dwelling unit.
City of OttawaSecondary dwelling unit/apartment FAQ · Permit triggers for secondary dwelling units
2026-10-01Open proof
Some basement conversionsPlumbing permit may be the only permit
Ottawa notes that in some basement-apartment cases only a plumbing permit may be required.
City of OttawaSecondary dwelling unit/apartment FAQ · Permit triggers for secondary dwelling units
2026-10-01Open proof
ZoningReview the property before construction
The City recommends reviewing the proposed secondary dwelling unit with a Building Official before work starts.
City of OttawaSecondary dwelling unit/apartment FAQ · Permit triggers for secondary dwelling units
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 secondary dwelling unit guide