What Is P.Eng. Stamping and Why Do You Need It in Ontario?

If you've applied for a building permit in Ontario, you've likely encountered the requirement for P.Eng.-stamped structural drawings. Here's what that means, why it's legally required, and what you get from a licensed structural engineering firm like AMGH Engineering.

What Is a P.Eng.?

P.Eng. stands for Professional Engineer — a designation granted by the Professional Engineers of Ontario (PEO) to engineers who have met the required educational qualifications, passed the Professional Practice Examination, and accumulated the necessary work experience. In Ontario, only a licensed P.Eng. can take legal professional responsibility for an engineering design.

What Is a P.Eng. Stamp?

A P.Eng. stamp (also called a seal) is the licensed engineer's official mark applied to engineering drawings. When a P.Eng. stamps drawings, they are legally declaring that the design is safe, code-compliant, and meets the applicable engineering standards. The stamp includes the engineer's name, registration number, and is backed by professional liability insurance.

Why Do Ontario Building Permits Require P.Eng. Stamps?

The Ontario Building Code requires P.Eng.-stamped structural drawings for permit applications involving modifications to structural elements — load-bearing walls, foundations, additions, and more. Municipalities require the stamp because it provides legal accountability: if the structural design fails, the P.Eng. bears professional and legal responsibility for the design.

What Can a Drafting Service Do vs. What a P.Eng. Can Do?

• Drafting service: Can produce drawings, but cannot stamp them, cannot take legal responsibility, and drawings may not be accepted by the building department
• Licensed P.Eng.: Can design, stamp, and take full legal accountability for the structural design — drawings are legally accepted for permit applications across Ontario