Welcome to the Professional Engineers Ontario Online Certificate of Authorization (C of A) Directory.

A Certificate of Authorization issued by PEO authorizes individuals and companies to engage in the business of offering and providing professional engineering services to the public.
It is not the licence issued to individuals to practise professional engineering.

Search the directory by: (Provide at least one of the following search conditions)
Company name
C of A ID#
City Name
IMPORTANT: Not all PEO licence holders hold Certificates of Authorization. To learn more about the C of A click here. For the most up-to-date information or if you are unable to locate a company, please contact Professional Engineers Ontario at 416-224-1100 or 1-800-339-3716. Your use of this Online Directory is conditional upon your acceptance of the Terms and Conditions for Use of Website. You should check the Terms and Conditions for Use of Website from time to time to keep informed of any changes or additions to them. By accessing and using this Directory, you agree, for yourself and for any entity on whose behalf you may be acting, to be bound by the Terms and Conditions for Use of Website even if you have not read them.