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OBC DIVISION B · PART 3 · SECTION 3.15 — SIGNS

What are the structural requirements for signs under the Ontario Building Code?

Regulated signs must be designed to safely resist all applicable loads, dead load, wind, snow and ice accumulation, and seismic effects, using the structural design provisions of Part 4, with adequate supports, anchorage and connections to the ground or the supporting building.

Code reference
Section 3.15 requires signs and their supporting structures to be designed and constructed to carry the loads to which they will be subjected, applying Part 4 structural design requirements. Supports, connections and anchorage must transfer wind and other loads safely to the building or foundation, and materials must be suited to exterior exposure and durability.
OBC Division B, Section 3.15 (Signs) and Part 4 (Structural Design)

Paraphrased for clarity — open this provision in the BUILDAiD Library for the exact wording.

What this means in practice

Wind governs almost every sign design: a large flat panel is essentially a sail, and the connection back to the building or foundation is where failures happen. For permit submissions, expect the municipality to require drawings sealed by a professional engineer for pylon signs, large fascia signs and any sign whose failure could hit people below. Verify the supporting building can take the added load, older parapets and canopies often cannot, and check corrosion protection for exposed steel. Illuminated signs add electrical approvals under ESA, outside the building permit.

Plain language

A big sign is basically a sail in the wind, so Ontario requires it to be engineered like any other structure: strong posts or brackets, solid anchoring, and connections that will not rip out of the wall or ground in a storm.

Related questions

When does a sign need a building permit under the Ontario Building Code?What rules apply to projecting signs over sidewalks in Ontario?What are the requirements for roof signs on buildings in Ontario?

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This page is provided for general information. Building code requirements depend on your specific project, occupancy and municipality, and code editions change. Always verify requirements against the current Ontario Building Code and confirm with your local building department.