Building a Shed - Town of Ajax

Building a Shed

Building permits are required for sheds larger than 10 m² (108 ft²).

Be advised that all sheds are required to meet the provisions set out in the Zoning By-law.

Building Approvals has created a user-friendly guide to help residents with the building permit application process.

Building Requirements


Sheds are required to be anchored to a foundation to resist uplift and lateral movement. Acceptable foundations are:

  • Floating concrete slab, maximum area of 55 m² (592 ft²)
  • 4'-0" deep foundation wall with footings
  • Wood mud sill, maximum 55 m² (592 ft²) and is not of masonry or masonry veneer cladding.

Prefabricated Sheds

Prefabricated structures must comply with the Ontario Building Code (OBC). Not all products sold in Ontario comply with the OBC; it is advised that before purchasing a system to contact the manufacturer to determine this. When applying for a building permit you are required to submit the specifications detailing compliance, failure to do so will delay the permit process.

Drawing Requirements

To submit a complete application the following items are required:

All drawings shall be fully dimensioned, drawn to scale on minimum letter sized paper. Note all sizes and types of construction materials to be used and their respective locations.

Other Approvals

In addition to the building permit you may be required to obtain approvals from one or more of the following:

Be advised this is not a complete list and other approvals may be required.

For more information, please contact us at 905-619-2529 ext. 3652.