Change Order in Canada: Template and Key Clauses (2026)

A change order in Canada is a signed document that records an agreed change to the scope, price or schedule of an existing contract, most often a construction or services contract. It is not a new contract; it is a controlled amendment to one already running. What makes the Canadian version specific is the interaction with standard industry forms, provincial lien and prompt-payment legislation, and sales tax. This guide explains how change orders work, the key clauses and a drafting skeleton. It is general information, not legal advice; confirm a live deal with a qualified local lawyer. ## What a change order is and how it differs from a change directive A change order is a bilateral document: both parties agree the change, its cost and its time impact, and sign. A change directive (used in construction) is different: the owner can instruct the contractor to proceed with a change before price and time are agreed, with valuation to follow. Knowing which instrument you are using matters, because a directive shifts the pricing risk and the timing of agreement. ## Standard forms: the CCDC family Canadian construction commonly uses the standard contracts of the Canadian Construction Documents Committee (CCDC), such as CCDC 2 for stipulated-price work. These forms contain their own mechanisms for changes in the work, change orders and change directives, and for how valuation and the schedule are adjusted. If your contract is a CCDC form, draft each change order to fit that form's defined process rather than inventing a parallel one. ## Provincial law: liens and prompt payment Construction law in Canada is provincial. Most provinces have a builders' or construction lien statute, and several have modernised their regimes to add prompt-payment rules and adjudication. Ontario's Construction Act is the leading example, with statutory payment timelines and a right to interim adjudication of disputes, including disputes over the valuation of changes. Because a change order changes the amount owing, it can affect holdback, payment timing and lien rights. Confirm the rules in the specific province, because they differ. ## Tax A change order that increases the contract price also changes the tax base. GST at 5 percent, or HST in HST provinces, generally applies to the added value, and British Columbia, Saskatchewan, Manitoba and Quebec apply their own taxes. State whether the change-order amount is tax inclusive or exclusive so there is no argument on the invoice. ## Key clauses in a Canadian change order - Reference to the base contract: name the contract, its date and the parties, and state that all other terms continue unchanged.

• Description of the change: a precise statement of the added, removed or altered scope, with drawings or specifications where relevant.
• Price adjustment: the increase or decrease, how it was valued (lump sum, unit rates, cost plus), and the tax treatment.
• Schedule adjustment: any change to completion dates, milestones or the critical path.
• Effect on holdback and payment: how the change affects statutory holdback and the next payment application.
• No waiver: confirmation that agreeing this change does not waive rights on other claims.
• Authority: signature by someone with authority to bind each party.
• Documentation: reference to any change directive that preceded the order, and attached backup. ## A simple drafting skeleton 1. Title, change-order number and date

2. Reference to the base contract and parties
3. Description of the change in scope
4. Reason or instruction (including any prior change directive)
5. Price adjustment and valuation method
6. Tax treatment (GST/HST/PST/QST)
7. Schedule and milestone adjustment
8. Effect on holdback and payment application
9. Statement that all other terms continue
10. No-waiver and reservation of rights
11. Authorised signatures and date Number change orders in sequence and keep a running log, because disputes often turn on whether a change was properly authorised and priced before the work was done. ## Common mistakes to avoid - Doing the extra work on a verbal instruction, then arguing about price later; agree and sign first where possible.

• Confusing a change directive (proceed now, value later) with a change order (agreed and signed).
• Ignoring the effect on statutory holdback and prompt-payment timelines, especially in provinces like Ontario.
• Leaving tax silent on the change-order amount.
• Failing to state that the base contract otherwise continues unchanged. ## Authority and the paper trail Many change-order disputes in Canada are really disputes about authority: who, on each side, could commit to extra cost. A site supervisor may not have power to approve a price increase that binds the owner, yet instructions get given on site and work proceeds anyway. Name in the contract the roles that can authorise a change, set a dollar threshold above which a signed order is mandatory, and keep every instruction in writing. A numbered log of change orders, each tied to the instruction behind it, is the single best protection if the project later goes to adjudication or court. It also matters for payment: an approved, documented change flows cleanly into the next progress claim, while an undocumented one invites a holdback or a set-off. ## Services contracts, not just construction Change orders are not only a construction tool. Software, consulting and outsourcing contracts in Canada use the same device: a short written amendment that records new scope, a revised fee and any date change, signed by both sides. The discipline is identical. Agree and sign before the extra work starts, state that all other terms of the master services agreement continue, and keep the change orders numbered and attached to the base contract so the current scope is always clear from the file. ## Keeping a contract portfolio under control One Canadian change order is manageable by hand. A portfolio is not. The hard part is tracking which version is current, when each notice period runs, which clause carries risk, and which renewal is due. That work (drafting from a tuned template, flagging risky clauses, tracking dates, keeping versions straight) is what an AI contract workspace can hold in one place. Adira is built for this, with per-clause risk review, plain-English clause editing and a live activity timeline. It is India-first today, with other jurisdictions architected but not yet at the same depth, so verify local depth before relying on it for Canadian law. More at Adira. The law above stands on its own. ## Bottom line A Canadian change order is a controlled, signed amendment to an existing contract that records new scope, price, tax and schedule. Fit it to any CCDC form you are using, respect the province's lien and prompt-payment rules, set the tax treatment clearly, and keep a numbered log. Get Canadian construction advice for anything contentious.