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
- Choose the ARU type
- Confirm zoning and site feasibility
- Prepare the complete drawing package
- Submit before construction
Official sources behind this page
ARU permitBuilding permit required
London states that an approved building permit is required before construction of any new ARU.
City of LondonAdditional Residential Units · ARU types, permits, zoning and review period
2026-10-01Open proof
ARU typesInterior, garage, addition or detached
London identifies four main ARU types: interior/basement conversion, converted garage, detached and addition to an existing building.
City of LondonAdditional Residential Units · ARU types, permits, zoning and review period
2026-10-01Open proof
ZoningReviewed as part of the process
The City states that zoning compliance is reviewed through the building permit process.
City of LondonAdditional Residential Units · ARU types, permits, zoning and review period
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 additional residential unit guide