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 the basement use
- Separate ordinary finishing from a new dwelling unit
- Prepare floor plans and construction details
- Submit before regulated renovation work
Official sources behind this page
Basement finishingPermit required
Oshawa lists finishing a basement among projects that require a building permit.
City of OshawaBuilding Permits · Residential permit triggers and project resources
2026-10-01Open proof
Alteration / renovationUse the alteration/renovation application type
Oshawa’s application descriptions cover interior finish, alteration and interior gutting under alteration/renovation.
City of OshawaBuilding Permits · Residential permit triggers and project resources
2026-10-01Open proof
Secondary suiteSeparate Building Code guidance
Oshawa publishes a dedicated Ontario Building Code guide for basement secondary suites.
City of OshawaOntario Building Code Guide to Basement Secondary Suite · Basement secondary-suite Building Code guidance
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 basement renovation guide