Ontario Building Permits for Steel Structures: What You Need to Know

One of the most common questions we get from clients is: "Do I need a permit for my steel building?" The answer is almost always yes — but the process is more straightforward than most people expect.

Here is a plain-language guide to Ontario building permits for steel structures.

Under the Ontario Building Code, a building permit is required for:

• Any new structure over 10 square metres (about 108 square feet)
• Any structure intended for human occupancy (including barndominiums and workshops with living quarters)
• Any structure with plumbing or electrical
• Additions to existing structures that increase floor area
• Changes to the use of an existing building

Agricultural exemptions: Some agricultural buildings may be exempt from certain requirements under the Farm Buildings section of the Ontario Building Code, but this exemption has specific conditions and does not apply to all farm structures. Do not assume your building is exempt without confirming with your local building department.

Building permits are issued by your local municipality — the city, town, or township where your property is located. Each municipality has its own building department and may have local requirements in addition to the provincial Building Code.

If your property is in an unorganized territory (areas without municipal government), permits are issued by the Ministry of Municipal Affairs and Housing.

A typical building permit application for a steel structure requires:

• Site plan: A drawing showing the location of the proposed building on your property, including distances from property lines, roads, and other structures
• Construction drawings: Detailed plans showing the building dimensions, structural design, foundation, and any mechanical or electrical systems
• Engineered drawings: For most steel buildings, stamped drawings from a licensed structural engineer are required
• Property survey: Confirming property boundaries and existing structures
• Completed application form: Available from your local building department

Your steel building supplier should be able to provide engineered drawings for the structure. Your builder can typically assist with the site plan and application.

Under the Ontario Building Code Act, municipalities are required to issue a permit within:

• 10 business days for houses
• 15 business days for small buildings
• 20 business days for larger or more complex buildings

In practice, timelines vary. Some municipalities process permits quickly; others are backlogged. Rural municipalities with smaller building departments may take longer.

Plan for 4 to 8 weeks from application to permit issuance in most cases. If your project is time-sensitive, submit your application as early as possible.

Permit fees vary by municipality and are typically calculated based on the value of construction or the floor area of the building. As a rough guide, expect to pay:

• $500–$2,000 for a small agricultural building
• $1,500–$5,000+ for a larger commercial or residential structure

Some municipalities also charge development charges or other fees. Confirm the full cost with your local building department before budgeting.

Building without a required permit is a serious issue in Ontario. Consequences can include:

• Stop-work orders: The municipality can order all construction to halt
• Fines: Under the Building Code Act, fines can reach $50,000 for individuals and $100,000 for corporations
• Demolition orders: In extreme cases, unpermitted structures can be ordered demolished
• Insurance problems: Your insurer may deny claims for damage to an unpermitted structure
• Sale complications: Unpermitted structures must be disclosed when selling property and can complicate or kill a sale

The cost and hassle of obtaining a permit upfront is always less than dealing with the consequences of building without one.

1. Start early: Submit your application well before you want to break ground
2. Use a local builder: A contractor familiar with your municipality's requirements can help avoid delays
3. Get engineered drawings: Most municipalities require them for steel structures; having them ready speeds up review
4. Respond promptly: If the building department requests additional information, respond quickly to avoid delays
5. Schedule inspections: Once your permit is issued, required inspections must be completed at specific stages of construction

At Iron Valley Constructions, we work with our clients to navigate the permit process from start to finish. We know what local building departments require and can help ensure your application is complete and accurate the first time.

Call 613-662-9278 or request a free quote online. We will walk you through the permit requirements for your specific project and municipality.