Brampton permits up to three dwelling units on a property in specified configurations, subject to the applicable requirements. A three-unit dwelling places two attached Additional Residential Units within the principal dwelling.
The layout must account for independent living, access, fire protection, plumbing demand, water service, electrical capacity, HVAC and property-specific restrictions. Feasibility should be established before a multi-unit layout is promised.
Three-Unit Feasibility Review
A preliminary review should examine the complete building rather than only the basement.
Property Configuration
Confirm the proposed combination of principal dwelling and attached ARUs.
Complete Building Layout
Plan unit boundaries, shared areas, stairs, exits and service access.
Water and Drainage
Review demand, pipe sizing, drainage and the location of multiple kitchens and bathrooms.
Fire and Life Safety
Coordinate assemblies, alarms, exit strategy and equipment access throughout the dwelling.
Parking and Exterior Work
Review parking, entrances, windows and any required site alterations.
Separate Registration
Plan for each ARU to follow the applicable registration requirements.
Planning a Three-Unit Dwelling
- Confirm the permitted configurationReview the proposed property and unit combination.
- Assess whole-building capacityEvaluate layouts, exits, water, drainage, electrical and mechanical systems.
- Prepare coordinated drawingsDocument all affected floors, unit relationships and construction details.
- Complete application reviewAddress municipal and external-agency requirements before construction.
- Build and inspect in stagesCoordinate multiple systems without concealing work prematurely.
- Complete registrations and licencesFinalize each applicable ARU and rental requirement.
Why Three-Unit Projects Need Early Coordination
These projects can affect systems serving the whole property.
- Existing water service and pipe sizing
- Location and number of plumbing fixtures
- Electrical service and distribution
- Heating, cooling and ventilation strategy
- Independent and shared exit routes
- Garbage, parking, storage and property management
What Shapes the Project Scope and Cost?
A responsible estimate follows the property assessment and proposed scope. Important cost drivers include:
- Whole-building drawing scope
- Number of kitchens and bathrooms
- Service upgrades
- Fire separation between multiple units
- Entrance and stair alterations
- Multi-stage inspections and corrective work
Confirm before advertising or designing units.
A maximum number of units in policy does not prove that every property can accommodate that configuration. Site and building conditions still need review.
Frequently Asked Questions
Does Brampton allow three units on every property?
No blanket conclusion should be made. The City describes permitted configurations, but zoning, property, servicing and external approvals can affect a specific project.
Can one ARU be in the basement and another upstairs?
Attached ARUs may occupy different parts of the principal dwelling, but the proposed configuration requires a coordinated design and approval.
Can I add a third unit after registering a second unit?
The City states that customers with a previously registered second unit can apply for a third unit, subject to the current requirements.
Are both ARUs registered?
Brampton requires each ARU on a property to follow the registration requirements.
Request a Three-Unit Feasibility Assessment
Describe the existing dwelling, any registered unit and the proposed location of the additional units.