The OAA supports the use of industry standard documents. The use of standard documents allows the parties to concentrate on project specific issues rather than boilerplate sections. To that end, the OAA developed several standard contracts for use with clients and consultants which balance the needs of all parties.

This is the corresponding usage guide (with instructions) for the OAA 900-2021 subcontract between licensed member and subconsultant which provides background information about how to fill in and use the subcontract. It also includes as attachments a sample subcontract and a sample attachments file to indicate the type of information to be entered in the various text boxes.

For additional information, consult the Index to OAA Contracts and Guides and the Contracts for Professional Services page.

Legislative Change: Updated Construction Act Now In Force

Effective January 1, 2026, significant amendments to the Construction Act and its associated regulations came into force, affecting both contracts for professional services and construction.

Work is underway to update the OAA Contracts Suite and guides to reflect these changes. Click here to learn more.

Construction Act (after January 1, 2026)

Updated OAA Contracts and Guides Coming Soon

Construction Act (before December 31, 2025)

Downloads

OAA 900-2021 GUIDE
Quick Start Instructions: How to Use the Template Files and Customize
Sample OAA 900-2021 Contract and Attachments (For Reference Only) (ZIP File)