All accessory structures in the Town of Whitby, such as sheds or detached garages, are regulated under the Zoning By-law and may be subject to requirements in the Ontario Building Code.

Apply for a building permit

If your accessory structure, other than a shed, is larger than 10 m² in size, you'll need to get a building permit before you begin construction.  If your shed, that is accessory to a dwelling, is larger than 15 m² in size and/or greater than one storey in building height, then you'll need to get a building permit before you begin construction.  Learn how to apply for a building permit. Even if a building permit is not required, all accessory structures must comply with the provisions of the Zoning By-law.

Building and zoning requirements

The Zoning By-law sets out the building standards for all accessory structures. When designing an accessory structure make sure to follow these general guidelines and requirements:

• If the accessory structure, other than a shed, is less than 10 m² in size, you don't need a building permit, but you must still follow the provisions in the Zoning By-law
• If the shed, that is accessory to a dwelling, is less than 15 m² in size, you don't need a building permit, but you must still follow the provisions in the Zoning By-law
• Generally, accessory structures in residential zones can be a maximum of 4.5 m in height
• You can only add an accessory structure to a side yard or back yard in residential zones
• Accessory structure must be located a minimum of 0.6 m from all neighbouring property lines. Eaves and roof overhangs may encroach into the setback a maximum of 0.3 m
• If the structure has windows that face neighbouring properties or streets will be subject to additional setback requirements and should be reviewed during the building permit process
• Review the applicable Zoning By-law to learn about lot coverage maximums for accessory buildings.

Residential accessory buildings can't be used as a business or dwelling unit.

What is an accessory structure?

Accessory structures can be anything that is detached from the main building on the property and can include:

• Sheds
• Detached garages
• Gazebos
• Pool houses