Structural Engineering Site Inspections in Ontario: What Contractors Need to Know

In Ontario construction projects, a structural engineer site inspection may be required as part of the permit process. In practice, this is the engineer’s “general review” site visit—an on-site observation to confirm that the work observed is generally consistent with the sealed drawings and the Ontario Building Code (OBC). These inspections are not general quality checks; they are targeted engineering reviews tied to specific structural elements.

For contractors, understanding when a structural engineer site inspection is required — and what it includes — helps prevent delays, failed inspections, and liability issues.

When Is a Structural Engineer Site Inspection (General Review) Required?

A structural inspection is typically required when:

• The building permit file includes a “Commitment to General Review” by a P.Eng. (or architect)

• The municipality/CBO requests engineering confirmation to close out a permit stage

• Engineered structural work must be observed at key stages before it is concealed

• A field change is proposed that may affect structural capacity or load paths (requires engineer review before proceeding)

Under Division C of the OBC, where general review is required as part of the permit process, the engineer typically conducts site inspections at key stages to determine whether the work observed is generally consistent with the sealed design documents—especially before critical structural items are concealed.

On some industrial projects, separate requirements may also apply under Ontario health and safety regulations (for example, certain systems such as pallet racking can trigger a Pre-Start Health and Safety Review (PSR)).

Common situations where contractors often need an engineer site inspection include:

• Load-bearing wall removal

• New beams or columns

• Mezzanine installations

• Structural steel connections

• Foundation underpinning

• Roof or floor reinforcing

What Does a Structural Engineer Inspect During a Site Inspection?

A structural site inspection is focused and evidence-based. The engineer verifies structural work that is visible at the time of the visit against the sealed drawings and applicable CSA standards such as:

• CSA S16 (steel structures)

• CSA A23.3 (concrete design)

• CSA O86 (wood design)

Typical inspection items include:

• Beam sizes and installation

• Column anchorage and base plates

• Bolt grades and connection details

• Rebar placement and spacing

• Bearing lengths and load paths

• Framing alignment and support conditions

The engineer may take measurements, photos, and note deficiencies requiring correction before issuing a structural engineer letter.

Site Review vs. Municipal Inspection

It is important to distinguish between inspection roles. Both municipal inspections and structural engineer site inspections may be required on the same project.

Inspection Type	Performed By	Purpose
Building inspection	Municipal inspector	Code compliance (minimum standards)
Structural engineer site inspection (general review)	P.Eng.	General consistency with sealed design documents (as observed), and documentation of deficiencies

Common Contractor Mistakes

• Calling for inspection after drywall is installed

• Deviating from structural drawings without approval

• Substituting materials without engineer review

• Covering connections before verification

Any field change that may affect structural capacity or load paths should be reviewed by the engineer before the revised work is built or concealed.

What Happens After the Inspection?

If the work conforms to drawings, the engineer may issue:

• A site inspection (general review) report

• A sealed structural compliance letter

• Documentation required for permit closeout

If deficiencies are observed, corrections must be completed and re-reviewed.

Why Structural Site Inspections Matter

Structural components control load transfer, stability, and safety. Errors in installation — even small ones — can compromise:

• Load-bearing performance

• Lateral stability

• Long-term durability

• Insurance and liability protection

Engaging a qualified professional engineer (P.Eng.) in Ontario ensures documentation is defensible and technically sound.

Conclusion

A structural engineer site inspection is not a formality — it is often required when the permit process includes a commitment to general review or when the municipality requests engineering confirmation. Clear coordination between contractor and engineer ensures compliance, minimizes delays, and protects all parties involved.

At Parsways Inc., we provide structural engineering site inspections, general review services, and sealed compliance letters across residential, commercial, and light industrial projects in Ontario, aligned with Ontario Building Code requirements and applicable CSA design standards.

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FAQs

1) When should I call the structural engineer for inspection?

Before structural elements are concealed and after installation is complete.

2) Can a contractor modify a beam size in the field?

No. Any structural change requires engineer approval.

3) Does every project require a structural site inspection?

Only projects involving engineered structural elements or those specified in the permit conditions.