Second Suites and Two-Unit Housing in Barrie

Second suites, basement apartments, and detached accessory units can be a practical way to add income, support family, or increase long-term property value. In Barrie and across Simcoe County, however, these units must meet specific zoning, building, fire, and registration requirements to be legal.

Before you go further, it helps to know

  • Not every property qualifies for a legal second suite
  • Rules vary by municipality, even within Simcoe County
  • Registration with the City of Barrie is mandatory
  • Fire safety, parking, servicing, and exits are common deal-breakers
  • Legal status affects financing, insurance, and resale

What exactly is a second suite (or ARU)?

A second suite is a fully self-contained dwelling unit located within, attached to, or detached from a primary home. It must include:

  • Kitchen
  • Bathroom
  • Sleeping area
  • Separate entrance

Second suites generally fall into three categories:

  • Internal (basement or interior conversion)
  • Attached (an addition)
  • Detached (coach house or garden suite)

Second suites are permitted on properties zoned Neighbourhood Area under Barrie’s zoning regulations¹. They provide independent living space while helping homeowners offset housing costs.

Why registration is mandatory in Barrie

All second suites, including detached accessory dwelling units (DADUs), must be registered with the City of Barrie². Registration ensures:

  • Fire and Emergency Services are aware the unit exists
  • Compliance with Ontario Building Code, Fire Code, and Property Standards
  • Safety inspections protect tenants and property owners

Failing to register is a contravention of the Second Suites Registration By-law and can result in fines or enforcement action².

Note: Since March 2024, once all required inspections are passed, registration is automatically granted. No additional licensing step is required².

How registration typically works

  1. Application – Submit required forms, floor plans, and property details²
  2. Inspections – Zoning, building, fire, and property standards are reviewed²
  3. Corrections – Address deficiencies and re-inspect if required²
  4. Final registration – Suite is officially registered once approved²
  5. Notifications – Relevant departments and utilities are notified²

Key zoning and building requirements

  • One second suite per property³
  • Maximum size: up to 45 percent of the principal dwelling’s gross floor area
  • Parking: minimum of one dedicated space per unit
  • Detached units (DADUs): subject to lot coverage, setbacks, height, and accessory structure rules³
  • Municipal services: detached units must be fully connected³

Safety and compliance

All legal second suites must meet:

  • Ontario Building Code
  • Ontario Fire Code
  • Barrie Property Standards

This includes compliant exits, fire-rated separations, smoke and carbon monoxide alarms, ventilation, and electrical safety. Inspections are conducted to confirm compliance².

Grandfathering and older units

Some older units may qualify as legal non-conforming if their existence predates zoning changes. Documentation must be provided to Barrie Planning Services. Even grandfathered units must be registered and meet safety requirements².

Why legalising your suite matters

  • Peace of mind by reducing enforcement risk
  • Safety for occupants and owners
  • Resale clarity for buyers, lenders, and insurers
  • Income stability through compliant rental use
  • Community benefit by supporting gentle density and housing supply¹

Detached accessory dwelling units (DADUs)

Barrie permits detached accessory dwelling units in certain contexts. These structures must comply with zoning, servicing, lot coverage, and privacy standards²,³.

  • Lot coverage of ten percent or less
  • Connection to municipal services
  • Accessory structure location standards
  • Minimum parking requirements
  • Height, setback, and privacy rules

If you are outside Barrie

In Innisfil, Oro-Medonte, Orillia, Bradford, Collingwood, Essa, Midland, and other nearby municipalities, second suite rules differ. Always confirm zoning, registration, and permitting requirements locally before proceeding.

Detailed rules by municipality

For a technical reference covering municipality-specific rules, inspections, and common compliance issues, see:

Second Suite Rules and Requirements in Simcoe County

Resource links


Links point to official municipal sources. Requirements change. Always confirm with local Building and Planning departments.

Disclaimer

This page is general information only and not legal, tax, engineering, or permitting advice. Requirements vary by property and municipality.