Accessory structure (shed, gazebo, detached garage)

Your drawings must clearly show what is existing and the changes you’re proposing. Drawings must be to scale, and should use metric measurements. We may request additional information when your application is reviewed.

For accessory structures such as sheds, gazebos or detached garages, you’ll need to submit:

The site plan must include the following:

  • Scale (metric only)
  • Direction (North arrow)
  • Municipal address
  • Legal description (lot and plan numbers)
  • Existing buildings and accessory structures labelled “existing”
  • Proposed construction (hatch and label “PROPOSED” in capital letters)
  • Dimensioned property lines
  • Overall building dimensions
  • Rights-of-way and easements
  • Landscaped areas and hard surfaces such as driveways and walkways

Set backs

  • Setbacks from all property lines to all new structures

Site statistics

  • Lot area
  • Lot frontage
  • Lot coverage (meters squared and percent)
  • Description or breakdown of what is included in coverage

Driveway and walkways

  • Driveway width
  • Driveway setback to adjacent property line(s)
  • Driveway surface treatment
  • Dimension of any walkway attachment width to driveway


  • Established grade calculation
  • Points used for established grade shown on the site plan

The floor plan must include the following:

  • Direction (North arrow)
  • Title and scale
  • Use and size of rooms and spaces
  • Interior and exterior dimensions, including door and window sizes
  • Structural framing indicating the size, type, grade, spacing, direction of span and location of all structural members (joists, beams, posts and lintels, as well as engineered floor members when applicable)
  • Floor drains and ventilation provisions
  • Section marks

In addition to the above, the foundation plan must include:

  • Soil bearing capacity
  • Size, thickness and material specifications of foundation walls and footings
  • Step down footing (SDF) locations
  • Size, spacing and footing specifications of interior load-bearing walls and columns
  • Concrete slab and granular fill thickness and material specifications
  • Size and grade of steel beams and columns

The roof plan must include the following:

  • Roof slopes
  • Roof space ventilation
  • Size, grade and spacing of roof rafters, roof joists (if cathedral or flat), ceiling joists, collar ties and ridge supports for conventional roof framing
  • Location of girder trusses and beams

Elevations are required for each side of the project. They must include the following:

  • Title and scale
  • Grade level
  • Existing and proposed work
  • Finished floor levels
  • Vertical dimensions
    • To the highest ridge
    • To the eaves
  • Exterior wall cladding, finishes and flashing
  • Sizes and location of windows and doors
  • Roof overhang and dimensions
  • Roof shape, slope and finish
  • Rain water leaders and eavestroughs
  • The percentage of glazed areas relative to exposed building face calculations

Sample drawings

Contact us

If you need more information, call 311 (905-615-4311) or contact us online.