Secondary Suite
Learn about secondary suites in Canadian housing — what they are, their benefits, and the legal requirements for adding one.
June 27, 2025
What is a Secondary Suite?
A secondary suite is a self-contained residential unit within a single-family home, often in a basement or accessory building, designed for rental or extended family use.
Why Secondary Suites Matter in Real Estate
In Canadian housing, secondary suites help increase housing supply, provide rental income, and support multigenerational living.
Key features:
- Private entrance and living space
- Full kitchen and bathroom facilities
- Separate heating and ventilation systems (often required)
Secondary suites must comply with zoning, building, and fire safety codes to be legal. They may also impact mortgage qualification and insurance.
Understanding secondary suites helps buyers, owners, and investors assess income potential and regulatory compliance.
Example of a Secondary Suite in Action
The homeowner added a legal secondary suite in the basement to generate rental income and help qualify for a larger mortgage.
Key Takeaways
- A self-contained unit within a home
- Provides rental or extended family housing
- Must meet legal and safety standards
- Boosts property value and income potential
- Affects financing and insurance
Related Terms
- Rental Suite
- Zoning
- Building Code
- Permit Compliance
- Rental Income


Canada residential unit sales by month, actual, 2019 and 2024-2026. Data through June 2026. Source:
Canada residential sales-to-new-listings ratio, actual, January 2025 to June 2026. Source:
Canada residential months of inventory, actual, January 2025 to June 2026. Source: Source:
Year-over-year change in residential average sale price for Canada, Ontario, British Columbia and Alberta, January 2022 to June 2026. Average price is shown here as a regional mix measure, not a substitute for HPI or local comparable sales. Source:
Year-over-year change in residential unit sales for Canada, Ontario, British Columbia and Alberta, January 2024 to June 2026. Source: 






15284-15296 Fleetwood Drive in Surrey. (Flat Architecture, 1098261 BC Ltd.)
Renderings of the tower proposed for 15284-15296 Fleetwood Drive in Surrey. (Flat Architecture, 1098261 BC Ltd.)

Goldberg Group 
10-storey apartment building currently occupying 525 Eglinton Avenue East/WND Associates
Rendering of 525 Eglinton Avenue East/Wallman Architects
The Mayfair West site and its surrounding context. (Grosvenor, Arcadis, Hariri Pontarini Architects)
Renderings of Mayfair West. (Grosvenor, Arcadis, Hariri Pontarini Architects)
