Professional Services Subcontract
The Professional Services Subcontract was updated in September 2026, following a major revision in September 2025. It is available for members to use when back-to-back provisions are required to pass the rights and obligations of the Head Contract through to the Subconsultant. Download the latest version today!
The September 2026 version has been updated to ensure compliance in circumstances where invoicing under the Security of Payment Act (SOPA) has been opted into.
Prior to September 2025, the contract focused on the back to back provisions, leaving the Lead Consultant (the Architect) to supply other required terms and conditions. This update addresses many more elements and is a more comprehensive framing of the contractual relationship.
The development of the subcontract update was a jointly funded initiative of the ACA South Australia and Victoria/Tasmania branches and led by George Theodoridis, Chair of the ACA IR Committee and member of the ACA VIC/TAS Committee; and Mario Dreosti, ACA SA President. It was developed in partnership with Mills Oakley and Planned Cover.
Note: Architects may wish to reformat the contract terms by changing logos, fonts, and so on. However, it is important that they retain the clause numbering and indent structure in the contract terms.
Note: this does not replace legal and insurance advice. Any additions, subtractions or amendments may affect its operation and professional advice should be sought.
ACA members can download the subcontract when logged in (see below). If you are not a member, find out more about the benefits of ACA membership or apply to join here.
NOTE: Member Only Content