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Planning an additional residential unit in Waterloo, Ontario
Waterloo, Ontario, Canada
Start a Waterloo additional residential unit project by checking the property’s zoning, then the building permit and rental-licence requirements. The city overview allows up to four units on a low-rise property, but a map alone is not construction approval.
Key information
Start a Waterloo additional residential unit project by checking the property’s zoning, then the building permit and rental-licence requirements. The city overview allows up to four units on a low-rise property, but a map alone is not construction approval.
On this page
ARU planning checklist
| Item | City information |
|---|---|
| Self-contained unit | Own kitchen, bathroom and living area |
| Location | Inside detached/semi/townhouse or a detached coach house |
| Overview maximum | Up to 4 units on low-rise residential property |
| Low-rise height overview | Up to 4 storeys |
| Building approval | Building permit before construction |
| Rental use | Rental licence required |
Sources: Additional residential units
Your next steps
- Prepare
Check the interactive zoning map and current Zoning Bylaw 2018-050, especially 3.A.1 Bfor ARUs and 3.C.2 for coach houses.
- Contact or apply
Use the ARU toolkit and the checklist for an internal main-floor/basement unit or a detached coach house.
- Complete the next step
Before construction, obtain the building permit.
Sources: Additional residential units
Choose the design and approvals
- Check the interactive zoning map and current Zoning Bylaw 2018-050, especially 3.A.1 Bfor ARUs and 3.C.2 for coach houses. Confirm site-specific requirements with the city.
- Use the ARU toolkit and the checklist for an internal main-floor/basement unit or a detached coach house. Include the required drawings and project permits.
- Before construction, obtain the building permit. If the unit will be rented, apply for the rental licence too. Ask ARU@waterloo.ca for project guidance.
Sources: Additional residential units
Map limits and potential grant
The ARU map carries data dated May 30,2025 and is for general information. The city explicitly says not to rely on it for construction, real-estate or permit decisions.
The overview links an ARU grant of up to $30,000 for qualifying units rented at an affordable rate. That maximum is not automatic funding for every added unit; use the separate grant conditions and application before budgeting around it.
Family occupancy and rental use both fit the general ARU description, but renting brings the additional licensing requirement. Do not treat the four-unit overview as a substitute for checking the actual lot and proposed building.
Sources: Additional residential units
Questions and answers
What makes an ARU self-contained?
It has its own kitchen, bathroom and living area.
Source: Additional residential units
Can an ARU be inside a townhouse?
The city’s overview includes townhouses, subject to the property and project rules.
Source: Additional residential units
Can it be a separate backyard building?
A coach house or other qualifying detached structure is one described option.
Source: Additional residential units
Does every unit have to be rented?
No. The overview also allows family use.
Source: Additional residential units
What unit maximum does the overview state?
Up to four units on a low-rise residential property, with detailed zoning still to be checked.
Source: Additional residential units
Which zoning sections are highlighted?
3.A.1 Bfor additional units and 3.C.2 for coach houses in Bylaw 2018-050.
Source: Additional residential units
Can I use the ARU map as my permit approval?
No. It is general information and explicitly not for construction or permitting reliance.
Source: Additional residential units
Is the $30,000 grant guaranteed?
No. It is a potential maximum under a separate affordable-rental grant program.
Source: Additional residential units
Who can answer a site-specific project question?
Email ARU@waterloo.ca.
Source: Additional residential units
Sources: Additional residential units