Accessory Structures

Building permit applications are accepted through the Online Permitting Portal.

A building permit is required for any detached accessory structure that is:

  • 10 metres squared (about 108 feet squared) in size or greater
  • Attached to another structure regardless of size
  • A structure occupying an area of 10 metres squared or less, that contains plumbing


Designer requirements

Drawings that are prepared by a qualified designer (as defined in the Ontario Building Code) must include:

  • The qualified designer’s name
  • The qualified designer’s registration number
  • The qualification identification number of the qualified designer (Building Code Identification Number: BCIN)
  • The qualified designer's signature
  • The stamp or statement that the qualified designer has reviewed and taken responsibility for the design activities

Note: Property owners may prepare and submit drawings that follow the requirements outlined in the “drawing requirements” section below.


Drawing requirements

A PDF copy of the construction drawing must be provided.


All drawings are to be designed to a minimum scale of 1:75 or 3/16ths equals one foot. Drawings are to be fully dimensioned, signed and dated, and include information such as:

  • A property survey or site plan – including the location of the proposed accessory structure and dimensions indicating the distance from accessory structure to adjacent property lines
  • Lot grading plan approved by City of Vaughan Development Engineering Department
  • Construction drawings. Depending on the scope of work, each drawing set may require the following information:
    • Foundation plan
    • Floor plan or framing plan
    • Building elevations indicating building height, length, roof overhang dimensions, window and door locations and sizes and exterior finishes
    • Wall sections and details
    • Roof plan including engineered truss drawings and layout (if applicable)
    • Engineered beam and floor joist layout and specifications (if applicable)


Additional requirements