Ottawa Construction Association

Founded in 1889, the Ottawa Construction Association is one of the largest regional construction associations in Canada with more than 1,100 firms active in all sectors of the region's $5-billion construction market. The OCA serves its members in four major ways –Construction Project Information, Education, Networking and Advocacy.

Learn more about the OCA

OCA Summer Hours

Starting Friday May 12th, 2023 the OCA will be operating on Summer Hours. Please note the office will be closed at 3PM starting today and every Friday until September 1, 2023. **NEW** Regular office hours are 8AM-4PM Monday-Thursday and 8AM-3PM on Fridays during the summer. Don't forget to check our hours before you visit!!


OCA Construction Comment Magazine - May 2023 issue

Construction Comment is the official publication of the Ottawa Construction Association that is digitally distributed to key decision makers and purchasers in eastern Ontario’s construction industry.

Need to schedule Commissioner of Oath services?

This is a free service for OCA Members. Contact one of the commissioners by email during business hours (8:00am - 4:00pm), or Please call ahead for in person service.
Non-members would need to purchase Virtual Witnessing at $17.70 + HST for each document witnessed.

Looking for a location to host your next meeting?

Meeting room rentals are for sessions which do not involve an admission or training fee. If you would like to rent a room to conduct training or any type of event for which a fee will be charged, please contact the Ottawa Construction Association directly at: and provide us with the details of the event.

Publish your Certificates with OCA!

Construction purchasers, owners’ representatives and prime contractors can publish Ontario legal notices on including; Certificates of Substantial Performance, Notices of Non-Payment of Holdback, Notices of Termination, Certificates of Completion of Subcontract, Notices of Intention to Register a Condominium Link2Build charges a flat fee of just $199 per notice.

OCA Membership

Membership in OCA is your investment to growing your business! Explore our website to learn more about accessing thousands of bid opportunities, marketing your firm’s services or products, growing your business network, professional development opportunities in OCA’s Education program or the numerous cost saving OCA Affinity programs.

See all upcoming courses
  • Upcoming courses

    12 June 2023
    From $300.00 excl. Tax

    Trade Contracts: A Double-Edged Sword


    13 June 2023
    From $649.00 excl. Tax

    CCDC 5A+5B: Construction Management Keys to Success

    This course is part of the Managing Construction Series