Skip to Content
Logo Image
Contact Us Main menu icon
View our Twitter page linkedIn View our Facebook page View our Instagram page
Feedback
  • Living
    Here
    • About St. Marys
    • Air Quality
    • Building and Renovating
    • COVID-19
    • Child Care
    • Community Services and Centres
    • Emergency Services and Planning
    • Environment and Sustainability
    • Events Calendar
    • Facilities, Parks & Trails
    • Forestry Management
    • Garbage and Recycling
    • Library
    • Parking
    • Road Closures and Construction
    • Senior Services
    • Street Lights and Traffic Signs
    • Stonetown Supports: Wellbeing Resources
    • Transportation
    • View More...
    View our Garbage and Recycling page
    Garbage and Recycling
  • Recreation and Leisure
    • Access to Recreation Grant
    • ActiveNet / Register for programs
    • Adult and Older Adult Programs
    • Aquatics Centre
    • Camp PRC
    • Canadian Baseball Hall of Fame and Museum
    • Clubs and Activity Groups
    • Child and Youth Programs
    • Community Calendar
    • EarlyON Centre
    • Facilities, Parks & Trails
    • Library
    • Museum and Archives
    • Pyramid Recreation Centre
    • Recreation & Leisure Program Guide
    • Rentals and Bookings
    • School Break Care and Camps
    • Skate Park
    • Skating Programs
    • View More...
    View our Recreation and Leisure Program Guide page
    ActiveNet Online Registration
  • Discover
    Our Town
    • Arts and Culture
    • Community Calendar
    • Festivals and Special Events
    • Getting Around St. Marys
    • Heritage and Historic Landmarks
    • See, Stay and Play
    • Shopping and Dining
    • Stay in Touch
    • Summer Fun
    • St. Marys Tourism
    View our Buy Local page
    Buy Local
  • Doing Business
    • Applications, Licences and Permits
    • Available Sites and Buildings
    • Bids and Tenders
    • Building Services
    • Business Resources
    • Business Directory
    • Business Improvement Area (BIA)
    • Events Calendar
    • Maps
    • Planning and Development
    • Property Taxes
    • Schools
    • St. Marys Money
    View our Business Directory page
    Business Directory
  • Town
    Services
    • Accessibility
    • Animal Services
    • Applications, Licences and Permits
    • Budget and Finance
    • Appointed Committees and Boards
    • Community Safety and Well-being Plan
    • Contact Us
    • Cyber Security
    • Downtown Service Location Review
    • Elections
    • Grant Programs
    • Lottery Licensing
    • Mayor and Council
    • News and Public Notices
    • Planning and Development
    • Property Taxes
    • Publications, Reports and Plans
    • RZone
    View our Mayor and Council page
    Mayor and Council
  • Things
    I Need
    • Applications, Licences and Permits
    • Bids and Tenders
    • By-laws
    • Childcare
    • Council Agendas, Minutes and Meetings
    • Employment Opportunities
    • Facilities, Parks and Trails
    • Garbage, Recycling and Landfill
    • Library
    • Museum and Archives
    • Property Taxes
    • View More...
Main menu icon Menu
Home/Doing Business/Planning and Development/Accessory Apartments
Decrease text size Default text size Increase text size
|
Print This Page
|
Share This Page
  • Open new window to share this page via Facebook Facebook
  • Open new window to share this page via LinkedIn LinkedIn
  • Open new window to share this page via Twitter Twitter
  • Email This page Email
  • Planning and Development
    • Accessory Apartments
    • Community Improvement Plans
    • Official Plan
    • Current Planning / Development Applications
    • Planning Fees and Development Charges
  • Applications, Licences and Permits
  • Available Sites and Buildings
  • Bids and Tenders
  • Building Services
  • Business Resources
  • Business Directory
  • Business Improvement Area (BIA)
  • Events Calendar
  • Maps
  • Property Taxes
  • Schools
  • St. Marys Money

Accessory Apartments

Show or hide navigation More

More in this Section...

Contact Us

An accessory apartment is a separate dwelling unit, which is located within and subordinate to a single-detached, a semi-detached, or row or townhouse.

Zoning By-law Amendment No. Z130-2018

On October 9, 2018, the Town of St. Marys passed Zoning By-law No. Z130-2018 to add regulations to the Town’s Comprehensive Zoning By-law No. Z1-1997 to permit a maximum of one accessory apartment per residential lot, in either of the following situations (but not both) and made further changes in June 2021 by passing Z144-2021:

In a single detached, semi-detached, row or townhouse dwelling

OR

In an accessory building or structure on a lot with an existing single detached, semi-detached, row or townhouse dwelling provided the:

  • accessory building or structure complies with 5.1.3A of the Towns Zoning Bylaw
  • accessory building or structure complies with the building height and lot coverage requirements of the Zoning By-law.

Other Zoning Regulations for Accessory Apartments

  • The maximum gross floor area of the accessory apartment can not exceed 45% of the gross floor area of the main building or 100 m2.
  • A home occupation is prohibited in any accessory apartment.
  • The lot is serviced by municipal water and sanitary sewer services.
  • One additional (non-tandem) parking space is provided for the accessory apartment.
  • The lot does not contain a garden suite.
  • The lot is not located east of the CNR tracks and north of Trout Creek.

 The Town’s Zoning By-law should be read in its entirety to determine all applicable zoning provisions.

BENEFITS OF PERMITTING ACCESSORY APARTMENTS
  • Provides an additional housing option in the community
  • Increases the supply of affordable housing
  • Make more efficient use of the existing housing stock
  • Creates jobs in the construction/renovation industry
  • Provides opportunities for additional income for homeowners
  • Allow seniors to live independently while still being close to family or friends
  • Can help pay the mortgage and maintenance costs for first time homebuyers

General Building Permit Information

Accessory apartments must comply with the Town’s Zoning By-law, and the Ontario Building Code.  Before you renovate your home to establish, enlarge or alter an accessory apartment, you should contact or visit the Town’s Building and Development Department at the Town of St. Marys Municipal Operations Centre (408 James Street South / 519-284-2340 ext 242) during office business hours.

Building Permit Information Flyer (PDF). Accessible version available upon request.

Other General Information

Your property taxes could be impacted by the creation of an accessory apartment.  Please contact the Municipal Property Assessment Corporation for further information.

You should also contact the Upper Thames River Conservation Authority to determine if your property is located within a Regulated Area (1424 Clarke Road, London / 519-451-2800).

Receive Email Updates...
  • Living Here
    • About St. Marys
    • Air Quality
    • Building and Renovating
    • COVID-19
    • Child Care
    • Community Services and Centres
    • Emergency Services and Planning
    • Environment and Sustainability
    • Events Calendar
    • Facilities, Parks & Trails
    • Forestry Management
    • Garbage and Recycling
    • Library
    • Parking
    • Road Closures and Construction
    • Senior Services
    • Street Lights and Traffic Signs
    • Stonetown Supports: Wellbeing Resources
    • Transportation
    • Water and Wastewater
  • Recreation and Leisure
    • Access to Recreation Grant
    • ActiveNet / Register for programs
    • Adult and Older Adult Programs
    • Aquatics Centre
    • Camp PRC
    • Canadian Baseball Hall of Fame and Museum
    • Clubs and Activity Groups
    • Child and Youth Programs
    • Community Calendar
    • EarlyON Centre
    • Facilities, Parks & Trails
    • Library
    • Museum and Archives
    • Pyramid Recreation Centre
    • Recreation & Leisure Program Guide
    • Rentals and Bookings
    • School Break Care and Camps
    • Skate Park
    • Skating Programs
    • St. Marys Quarry and Lind Sportsplex
    • View All...
  • Discover Our Town
    • Arts and Culture
    • Community Calendar
    • Festivals and Special Events
    • Getting Around St. Marys
    • Heritage and Historic Landmarks
    • See, Stay and Play
    • Shopping and Dining
    • Stay in Touch
    • Summer Fun
    • St. Marys Tourism
  • Doing Business
    • Applications, Licences and Permits
    • Available Sites and Buildings
    • Bids and Tenders
    • Building Services
    • Business Resources
    • Business Directory
    • Business Improvement Area (BIA)
    • Events Calendar
    • Maps
    • Planning and Development
    • Property Taxes
    • Schools
    • St. Marys Money
  • Town Services
    • Accessibility
    • Animal Services
    • Applications, Licences and Permits
    • Budget and Finance
    • Appointed Committees and Boards
    • Community Safety and Well-being Plan
    • Contact Us
    • Cyber Security
    • Downtown Service Location Review
    • Elections
    • Grant Programs
    • Lottery Licensing
    • Mayor and Council
    • News and Public Notices
    • Planning and Development
    • Property Taxes
    • Publications, Reports and Plans
    • RZone
  • Things I Need
    • Applications, Licences and Permits
    • Bids and Tenders
    • By-laws
    • Childcare
    • Council Agendas, Minutes and Meetings
    • Employment Opportunities
    • Facilities, Parks and Trails
    • Garbage, Recycling and Landfill
    • Library
    • Museum and Archives
    • Property Taxes
    • Report a Problem
Team Member Sign-In|Employee Self Service|Staff Portal|A-Z Services|Accessibility|Privacy|Contact Us|Report a Problem|Sitemap

© 2021 Town of St. Marys, Town Hall: 175 Queen Street East, Mail: P.O Box 998, St. Marys, ON. N4X 1B6, Phone: 519-284-2340, Fax: 519-284-2881

Designed by eSolutionsGroup

Browser Compatibility Notification

It appears you are trying to access this site using an outdated browser. As a result, parts of the site may not function properly for you. We recommend updating your browser to its most recent version at your earliest convenience.