Detached garages and sheds

Construction of an accessory building (e.g., detached garage, gazebo, pool house/change room), including pre-fabricated buildings, occupying an area greater than 10 square metres (108 square feet) requires a building permit. Construction of a one-storey detached storage shed that measures 15 square metres or less in gross area, is ancillary to the principal dwelling and without plumbing, does not require a building permit.

Before you begin

The Ontario Building Code outlines the minimum requirements for various elements, such as framing and foundation, and can be viewed on the Ontario Ministry of Municipal Affairs and Housing website.

Development Information Officers

In order to provide effective service to clients, the Development Information service is changing, as of August 1, 2023, in-person service will be available by appointment only.  If you require the services of a Development Information Officer, please call 613-580-2424 ext.23434 or email, include the subject address, proposed use, and other pertinent information relevant to the inquiry.  Upon receipt of the inquiry, a phone call or an email response will be provided within 2 to 3 business days, in the event more information is required there will be options to allow for further discussion.

Cost and timeline

Approximate cost

Refer to Applicable Fees

Approximate timeline

Approximate Timeline based on City Council approved enhanced service level:

  • First review - 5 business days

What you need

Required inspections

At key stages of building construction, your work must be inspected to ensure that the completed construction complies with the Ontario Building Code. The permit plans and specifications must be on site and made available to the Building Inspector at the time of inspection. To ensure the availability of a Building Inspector, you should book inspections 48 hours in advance. Failure to have the appropriate inspection performed may result in your having to uncover and expose the work for inspection, or other Orders issued, etc.

The Building Inspector's name and phone number are identified on the building permit. For a list of required inspections that may apply based on the proposed accessory building, please refer to the table on the next page.

Inspection Description
Sewer Lateral Prior to backfill of sanitary and storm sewers and water service. These inspections can be arranged by contacting the Tel: 613-580-2424 ext. 33246 Fax: 613-580-2627
The following inspections are undertaken by your Building Inspector
Excavation Required prior to placement of concrete footings.
Plumbing - Underground Required prior to covering underground plumbing. (Test required)
Foundation Required prior to backfill of foundation.
Plumbing – Rough-In Required at completion of plumbing rough-in, which includes drains, waste, vent and water piping system. (Test Required)
Framing and Mechanical Rough-In Required at completion of structural framing, and is satisfactory as required by the Ontario Building Code.
Insulation/Vapour Barrier Required at completion of insulation, air barrier and vapour barrier installation.
Plumbing – Final Required at completion of plumbing system, fixtures and appliances. (Test required)
Occupancy Inspection to confirm minimum Ontario Building Code requirements prior to occupying the space.
Final Required at completion of the building. Final Occupancy Permit for a fully completed building will be issued by the Building Official.


Building Code Service counters are open for personal services by appointment only. This includes the submission of permit applications, payment of fees and the issuance of permits. 

There are various methods for submitting applications.

A Development Information Officer (DIO) can advise on zoning regulations impacting your accessory building design such as setbacks to lot lines, building height and lot coverage.

Application Forms: Permit to Construct or Demolish