Do I Need a Structural Engineer for Permits in Toronto?

Table of Contents

1. When a Structural Engineer Is Required for a Toronto Permit
2. Projects That Always Require Structural Engineering for a Permit
3. What Happens Without an Engineer's Drawings
4. The Engineer's Role in the Permit Process
5. The Toronto Building Permit Process Step by Step
6. Toronto-Specific Considerations
7. What to Do Next
8. When to Call a Structural Engineer
9. Frequently Asked Questions

When a Structural Engineer Is Required for a Toronto Permit

For most structural work in Toronto, yes, a structural engineer is required to obtain a permit. Toronto Building will not issue a building permit for structural work without stamped drawings prepared and signed by a Professional Engineer licensed with PEO (Professional Engineers Ontario). This requirement applies to load-bearing wall removal, home additions, basement underpinning, foundation construction, and all other projects that involve changes to the building's structural system. Projects that fall within the prescriptive limits of Part 9 of the Ontario Building Code may not require custom engineering for every element, but anything that departs from standard prescriptive framing rules needs an engineer's sign-off.

Key Takeaways

• Toronto Building requires stamped structural drawings from a PEO-licensed engineer for any permit involving structural work.
• No other professional can provide the engineer's stamp, not an architect, designer, or contractor.
• Submitting a permit application without required structural drawings results in a deficiency notice and delays.
• An engineer who knows Toronto Building's submission format reduces the review cycle and speeds up permit issuance.

Projects That Always Require Structural Engineering for a Permit

The following project types require stamped structural drawings as part of the Toronto Building permit submission:

• Load-bearing wall removal or modification (any new beam required)
• Home additions of any size or type
• Basement underpinning or basement floor lowering
• Foundation construction for new structures, additions, or garden suites
• Structural roof modifications (dormers, attic conversions, roof additions)
• Second-storey additions
• New detached garages and garden suites
• Deck construction requiring a permit (typically decks over 600 mm above grade, confirm with Toronto Building)
• Any project where the structural elements exceed the prescriptive limits of OBC Part 9

See structural drawings for what a complete permit-ready engineering package includes.

What Happens Without an Engineer's Drawings

A permit application for structural work submitted without required engineer's drawings will receive a deficiency notice from Toronto Building identifying the missing documentation. The permit will not be issued until the deficiency is resolved. If structural work begins before the permit is issued, Toronto Building can issue a stop-work order, require demolition of completed work, and impose fines. Unpermitted structural work is a legal disclosure obligation in real estate transactions and can create insurance complications.

See Can a Structural Engineer Help With Building Code Compliance in Toronto? for more on how engineers keep projects compliant throughout the process.

The Engineer's Role in the Permit Process

The structural engineer is involved in the permit process from design through closeout:

Pre-permit: Site assessment, engineering calculations, and production of stamped drawings ready for permit submission.

Permit submission: Drawings submitted as part of the permit package. The engineer responds to any technical questions or comment letters from Toronto Building's review staff.

During construction: Structural drawings are the reference document for the contractor and city inspector. The engineer responds to field questions and issues revised drawings if site conditions differ from what was anticipated.

Inspections: City inspectors review completed work against the stamped drawings. The engineer is available to clarify drawing intent if the inspector raises a technical question.

Permit closeout: The permit is closed when all required inspections are passed. Stamped drawings become the permanent record of the approved structural work.

The Toronto Building Permit Process Step by Step

1. Confirm whether a permit is required for your project scope (contact Toronto Building or consult a structural engineer).
2. Engage a PEO-licensed structural engineer to prepare stamped drawings.
3. Assemble the permit package: structural drawings, architectural/design drawings, permit application form, and supplementary documents as required.
4. Submit through Toronto Building's online portal or in person.
5. Receive permit or deficiency notice. Resolve any deficiencies with the engineer.
6. Receive permit and begin construction per the approved drawings.
7. Schedule city inspections at required construction stages.
8. Receive final inspection sign-off and permit closeout.

Homeowners should confirm current permit process requirements and timelines directly with Toronto Building, as these can change.

Toronto-Specific Considerations

Toronto processes a very high volume of residential permit applications. Current processing timelines are published on the City of Toronto's website and fluctuate with demand. A complete, well-prepared application with properly formatted structural drawings moves through review faster than an application with deficiencies. Engaging an engineer who prepares drawings specifically for Toronto Building's submission standards and formats is a practical way to reduce permit processing time.

For heritage properties, an additional review by Heritage Preservation Services may be required before a permit is issued. For properties near ravines, TRCA review may also apply. See When Do You Need a Municipal Review for a Toronto Project? for more on these additional processes.

What to Do Next

1. Confirm whether your project requires a permit by contacting Toronto Building or a structural engineer.
2. Engage a structural engineer as early as possible in the planning process.
3. Submit a complete permit application, including stamped drawings, before beginning any structural work.
4. Do not start structural work without an issued permit.

When to Call a Structural Engineer

Call a structural engineer when you are planning any project that may require a building permit in Toronto. Earlier is better. If you are not sure whether a permit is required, the engineer can advise.

Frequently Asked Questions

Q: Can an architect provide the engineering drawings for a Toronto permit?

No. Architectural drawings cover layout and design. Structural drawings that require a P.Eng. stamp must be prepared and signed by a PEO-licensed Professional Engineer. On most projects, both an architect and a structural engineer contribute drawings to the permit package.

Q: Can I submit a building permit application myself as a homeowner?

Yes. Homeowners can submit permit applications for their own property. An authorized agent can submit on your behalf with written authorization.

Q: How long does a Toronto building permit take once submitted?

Processing times vary by project type and current city workload. Toronto Building publishes estimated timelines on its website. A complete application with properly prepared drawings reduces the delay risk from deficiency cycles.

Q: What does "permit-ready drawings" mean?

Permit-ready drawings are stamped structural drawings prepared specifically to meet Toronto Building's submission requirements: properly formatted, code-referenced, complete in scope, and signed by a PEO-licensed engineer. See structural drawings for what this includes.

Q: What if Toronto Building requests revisions to my structural drawings?

Your engineer of record responds to the comment letter, prepares revised drawings, and resubmits. This is a standard part of the permit process and is included within the engineer's engagement scope for comments within the original project scope.

Need permit-ready structural drawings for a Toronto project? Get My Free Quote from Toronto Structural Engineers.