Construction Act Adjudication in Ontario | Statutory Interim Adjudication

Statutory authority for adjudication

Construction Act adjudication in Ontario construction law is governed by Part II.1 of the Construction Act, which establishes Construction Dispute Interim Adjudication as a statutory dispute-resolution mechanism. Interim adjudication in Ontario is not merely a contractual option; it is a statutory right available to parties involved in construction projects where the Act applies.

Once the process is properly initiated by a party, participation is mandatory. The statutory framework under the Construction Act sets minimum standards that apply regardless of the wording of the construction contract, ensuring consistent access to this dispute-resolution process across the industry.

Legislative purpose and intent

The interim adjudication regime under the Construction Act was introduced to address two persistent challenges in the construction industry: cash flow disruption and project delay.

Construction projects rely on continuous payment down the construction pyramid. Unresolved disputes and delayed payments can quickly destabilize projects and affect contractors, subcontractors, and suppliers. The statutory process was designed to provide a fast, temporary resolution so that work can continue while disagreements are addressed.

By requiring compliance with adjudicator determinations on an interim basis, Construction Act adjudication prioritizes project continuity while preserving the parties’ ability to seek a final resolution later through litigation, arbitration, or settlement.

Interim nature of adjudication

Adjudication under the Construction Act is interim by design. An adjudicator’s determination must be complied with immediately, but it does not finally determine the parties’ legal rights.

This structure balances speed and fairness. Parties obtain prompt direction on disputed issues affecting ongoing work or payment, without losing the ability to pursue a more comprehensive determination after the project progresses or concludes through litigation or arbitration.

Disputes eligible for adjudication

The Construction Act defines, at a high level, the categories of disputes that may be referred to Construction Act adjudication. These include disputes relating to:

• the valuation of services or materials
• payment issues, including disputes over change orders
• notices of non-payment under the prompt payment regime
• amounts retained as set-off
• payment or non-payment of holdback
• other matters agreed upon by the parties or prescribed by regulation

Eligibility is strategically significant because it allows disputes affecting cash flow and progress to be resolved during the project through interim adjudication, rather than deferred until completion.

Limits on adjudication

Not all disputes qualify for adjudication. Certain issues — such as determinations of substantial performance or other excluded matters — fall outside the statutory scope.

These limits are intentional and ensure that the process remains focused on resolving disputes that directly affect project progress and payment, rather than broader or more complex issues requiring judicial or arbitral determination.

How this fits within the framework

This page explains what the Construction Act says about adjudication and why it exists.

For related information, see:

• Adjudication Process — how interim adjudication functions at a high level
• Deadlines & Timelines — why timing is critical under the Act.