If you remember one thing

Organise the story around evidence. An adjudicator needs the contract, the disputed issue and the records that support each position.

In Ontario

Construction Act

Prompt-payment applicability depends on the contract and procurement transition rules, not just the date on an invoice. Check section 87.3. The rules changed again on 1 January 2026; use the applicable version.

The owner’s notice is Form 1.1. Different forms and timing apply further down the payment chain. See section 6.4 and O. Reg. 303/18.

Read the governing source

The explanation below is a cross-province introduction. This jurisdiction note does not make every general example a rule for this province. Read the original adjudication guide for the shared explanation.

01

A route designed for construction disputes

Statutory adjudication is a process for deciding specified construction disputes on a shorter timetable than ordinary litigation. Its availability, procedure and effect depend on the governing regime.

Do not assume that every dispute, every contract or every time period is eligible. The relevant authority’s procedure and the statute must be read together. An adjudication decision can have an interim binding effect while other proceedings remain possible.

02

Build a chronology before a bundle

Begin with the contract and the specific payment issue. Record when work was supplied, when invoices were given, which amounts were paid and what was disputed. Connect each point to the document that supports it.

  • The relevant contract, scope and approved changes.
  • Invoices and evidence of giving or receipt.
  • Payment records and allocation of partial payments.
  • Notices, correspondence and service records.
  • The relief sought and the calculation supporting it.
03

Procedure is part of the work

The nominating or adjudication authority, appointment process, permitted disputes, delivery deadlines and fees vary. Ontario’s current adjudication regulation is O. Reg. 264/25; old procedural summaries may refer to a revoked regulation.

Starting adjudication does not mean it is safe to ignore a lien deadline or another preservation step. Check those rights separately with an adviser.

04

Prepare without overstating the outcome

A clear evidence record helps someone assess the issue. It does not guarantee a favourable decision or collection of the money. For a live dispute, confirm the available route and next deadline with a qualified professional.

Put it into practice

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Sources & scope

These are general educational explanations, not advice on a specific contract. Check the version of the law that applies to your project. This edition has not been represented as independently reviewed by a lawyer.

OntarioConstruction ActSource register & editorial method