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In Canada, the concept of secondary dwelling units (SDUs) is increasingly gaining popularity as cities look for sustainable solutions to accommodate growing populations and address housing affordability. If you’re considering adding a secondary unit to your property or simply want to understand how they work, this guide will provide an overview of what secondary dwelling units are, and how their regulations vary across cities in Ontario.

What is a Secondary Dwelling Unit?
A secondary dwelling unit, sometimes referred to as a “secondary suite,” is an additional living space within a primary residential building. This can include:

  • Basement Apartments: Converted basements designed as self-contained living spaces.
  • Granny Flats/In-law Suites: Separate units either attached or detached from the main house, designed to house family members.
  • Laneway Houses: Smaller, self-contained units built in the backyard of a residential property.

SDUs are typically equipped with their own kitchen, bathroom, and living areas, making them fully independent from the primary residence.

Benefits of Secondary Dwelling Units

  1. Increased Housing Supply: They provide additional rental options and help alleviate housing shortages.
  2. Affordable Living: SDUs offer more affordable rental options for tenants.
  3. Income Generation: Property owners can generate rental income, helping with mortgage payments or other expenses.
  4. Flexibility for Families: They offer a way to accommodate extended family members or caregivers.

Regulations and Restrictions Across Ontario Cities

While the concept of secondary dwelling units is broadly supported across Ontario, each municipality has its own set of regulations and restrictions. Here’s a look at some key cities and their rules:

  1. Toronto

In Toronto, secondary dwelling units are permitted in most residential zones, including single-family homes. The city’s regulations allow for:

  • Basement Apartments: Must meet specific building and fire safety codes. Property owners need to ensure proper egress windows and meet minimum ceiling height requirements.
  • Laneway Suites: Allowed in certain areas and must be compliant with design guidelines, including setbacks and height restrictions.

Key Restrictions:

  • Parking requirements may be reduced or waived for properties near transit.
  • Maximum unit size and design guidelines apply to maintain neighborhood character.
  1. Ottawa

Ottawa also supports secondary dwelling units, including both basement apartments and accessory units in detached and semi-detached homes. The regulations include:

  • Basement Apartments: Must meet the city’s fire and building code requirements. The property must have sufficient parking spaces.
  • Accessory Dwelling Units: Allowed in most residential areas, but must adhere to zoning by-laws regarding size and location.

Key Restrictions:

  • Specific zoning districts may have limitations on the number of units.
  • Building permits are required to ensure compliance with safety standards.
  1. Mississauga

Mississauga permits secondary dwelling units in detached homes, semi-detached homes, and townhouses. Regulations include:

  • Basement Apartments: Must comply with building and fire codes. Requirements include separate entrances and adequate fire safety measures.
  • Garden Suites: Allowed under certain conditions and must meet zoning by-law requirements.

Key Restrictions:

  • Restrictions on the maximum number of units allowed on a property.
  • Setback and parking requirements vary depending on the unit type and location.
  1. Hamilton

Hamilton’s approach to secondary dwelling units includes:

  • Basement Apartments: Permitted with adherence to building and safety codes. The unit must be self-contained with separate entrances.
  • Accessory Apartments: Allowed in most residential areas, with considerations for neighborhood compatibility.

Key Restrictions:

  • Compliance with zoning regulations, including parking requirements.
  • Restrictions on the size of the secondary unit relative to the main dwelling.
  1. London

In London, secondary dwelling units are regulated to ensure compatibility with residential neighborhoods:

  • Basement Apartments: Permitted with strict adherence to building codes and safety regulations.
  • Accessory Dwelling Units: Allowed in various residential zones, with certain design and size restrictions.

Key Restrictions:

  • Parking requirements may be relaxed in some areas.
  • Regulations on unit size and design to maintain neighborhood aesthetics.

Secondary dwelling units are a versatile solution to enhance housing options and provide flexibility for homeowners and tenants alike. While the overarching principles remain consistent, the specific regulations and restrictions can vary significantly from one city to another. It’s essential for property owners and potential renters to familiarize themselves with local bylaws and zoning regulations to ensure compliance and make informed decisions about secondary dwelling units in their area.

Whether you’re considering adding an SDU to your property or looking for a new rental opportunity, understanding these regulations will help you navigate the process smoothly and effectively.

Contact us today and let’s get you the funds to finance your next SDU project.