The change order process for construction projects moves through a defined sequence: a triggering event, written notice within the contract’s deadline, a documented request with cost and time backup, review by the architect or contracting officer, signatures from every required party, and updates to the contract sum and schedule. Miss a step and the claim weakens; miss a deadline and the claim can disappear entirely.
When the Process Applies
Change orders arise from a handful of recurring situations: unforeseen site conditions, design errors or omissions discovered during construction, owner-requested additions or deletions, and regulatory changes that force a redesign. The party requesting the change bears the burden of proving both that the change is necessary and that the proposed cost and time adjustments are reasonable.
Not every field adjustment needs a formal change order. Minor clarifications that don’t affect cost or schedule are typically handled through requests for information or supplemental instructions from the architect. The formal process kicks in when the modification will shift the contract price, extend or compress the schedule, or alter the fundamental nature of the work.
Give Written Notice Before the Deadline Runs
Before anything else, calendar the notice deadline. Under AIA A201, a claim for additional compensation or time must be made within 21 days of the event giving rise to the claim. Federal construction contracts governed by FAR 52.243-4 impose an even tighter lookback: no cost adjustment will be made for expenses incurred more than 20 days before the contractor provides written notice, and the contractor must formally assert its right to an equitable adjustment within 30 days of the triggering event.1Acquisition.GOV. 52.243-4 Changes
These windows are enforced strictly. Missing them is one of the most common reasons contractors lose otherwise valid change order claims. Written notice does not need to contain full pricing to be timely; it needs to identify the event, the date it occurred, and the fact that the contractor considers it a change. Pricing and schedule analysis can follow in the full request.
If delivery is physical rather than digital, get a signed and dated receipt from the receiving party’s authorized representative. When delivery timing is later disputed, that receipt is the simplest proof available. Many modern projects use a management platform like Procore or Autodesk Build, which generates an automatic timestamp and notifies all stakeholders at once.
What the Request Must Contain
The strength of a change order request depends almost entirely on the supporting documentation. A vague description of extra work and a round-number price invites pushback and delay. The request needs a clear technical description of the work being added, deleted, or revised, in enough detail that someone unfamiliar with the project could understand exactly what changed and why.
Financial backup needs to be granular: labor hours and hourly rates, material quantities and unit costs, equipment charges, and applicable overhead and profit. Many contracts cap the allowable markup on change order work. Overhead-and-profit markups of 10 to 20 percent on self-performed work and 5 to 10 percent on subcontracted work are common ranges, though the specific percentages are negotiated in the original contract and vary widely.
The request must also address schedule impact. Specify the number of days to be added to or subtracted from the substantial completion date and provide a revised schedule or time-impact analysis showing how the changed work affects the critical path. A change order that adjusts the price but ignores the time impact creates problems later, especially where liquidated damages are at stake.
The Standard Forms
Most projects document change orders on standardized forms rather than drafting them from scratch. The AIA G701 is the most widely recognized. It requires the preparer to enter the original contract sum, the net change from all previously authorized change orders, the contract sum before the current change, the dollar amount of the current adjustment, and the resulting new contract sum. A separate field captures the time adjustment in calendar days and the new substantial completion date. The form is not valid until signed by the architect, contractor, and owner.2The American Institute of Architects. AIA Document G701 2017 – Change Order
ConsensusDocs 200 follows a similar structure but uses slightly different terminology, referring to an “interim directed change” when the owner needs work to proceed before the parties have agreed on price or time. Both form families serve the same purpose: creating a single document that memorializes every financial and schedule adjustment so the contract stays current.
Review, Approval, and Signatures
After submission, the architect or designated project engineer evaluates the request on two fronts: technical merit and cost reasonableness. The reviewer checks whether the proposed costs align with current market rates, whether the time extension reflects the actual critical-path impact, and whether the change is genuinely outside the original contract scope. Additional documentation such as subcontractor invoices, supplier quotes, or updated site photos may be requested during this review.
If the architect finds the request justified, they prepare or endorse the change order and route it to the owner for authorization. AIA A201 does not impose a specific number of days for the owner to respond, and most standard-form contracts leave this to negotiation. The practical risk of an open-ended review period is project delay, which is why experienced contractors follow up aggressively and keep written records of every communication during the approval cycle.
A change order becomes part of the contract only when all required parties have signed. Under AIA A201, that means the owner, contractor, and architect. Under ConsensusDocs 200, it is the owner and constructor. Until those signatures are in place, the modification has no contractual force, and any work performed in reliance on an unsigned change order is done at the performing party’s risk.3AIA Contract Documents. AIA Document G701 – Change Order
When the Parties Cannot Agree: Construction Change Directives
Projects cannot always wait for full agreement on price and schedule before changed work begins. Under AIA A201, a construction change directive is a written order signed by the owner and architect that directs the contractor to proceed with a change before the parties have agreed on the cost or time adjustment.4AIA Contract Documents. Changes to the Contract – Differences Between Change Orders and Construction Change Directives The contractor does not sign a directive. The contractor must promptly proceed with the work, even while the financial terms are being negotiated.
This resolves a common standoff: the owner needs the work done now, but the contractor wants agreement on price before starting. The directive breaks the logjam by separating the performance obligation from the pricing negotiation. Once the owner and contractor agree on cost and time, the architect prepares a change order to supersede the directive and formally incorporate the adjustment into the contract.
ConsensusDocs 200 uses the term “interim directed change” for the same concept and allows contracts to set a cap on the cumulative value of outstanding directed changes before the contractor can decline to proceed without a fully executed change order. If your contract includes a directive mechanism, understand it before the first dispute arrives.
Updating the Contract Records
Once a change order is fully executed, several back-office updates must happen quickly. The master contract amount is adjusted to reflect the new obligation. On the AIA G701, this is the running calculation: original contract sum, plus or minus all prior change orders, plus or minus the current adjustment, equals the new contract sum. Getting the arithmetic wrong cascades through every subsequent payment application.
The schedule of values must be updated to include a new line item for the changed work, allowing the contractor to bill for it in the next progress payment. The project scheduler integrates the approved time extension into the baseline schedule, adjusting milestone dates and recalculating the critical path.
Significant change orders can also trigger bond-related obligations. On federal projects, the contracting officer must obtain consent from the surety when a contract modification changes the price by more than 25 percent or $50,000, or when the modification involves new work beyond the original scope.5Acquisition.GOV. 28.106-5 Consent of Surety Private-sector contracts vary, but most performance and payment bonds include language requiring notification to the surety when the contract sum changes materially. Failing to notify the surety can jeopardize bond coverage.
Federal contract records must be retained for six years after final payment.6Acquisition.GOV. 4.805 Storage, Handling, and Contract Files Private-sector retention periods vary by jurisdiction and are often tied to the applicable statute of repose for construction defect claims, which in most states runs between six and twelve years from substantial completion.
Always Address Time, Even When It Looks Like Zero
Every change order that extends the contract time directly affects the owner’s ability to assess liquidated damages for late completion. A change order granting additional days resets the substantial completion date, and the owner cannot collect liquidated damages for the period covered by the extension. On federal projects, the change order may also provide for an equitable readjustment of the liquidated damages rate under the new schedule.7Acquisition.GOV. 52.211-13 Time Extensions
The flip side matters just as much. If a change order adjusts the price but is silent on time, the original completion date stands. Contractors who perform extra work without securing a time extension in writing often find themselves absorbing liquidated damages for delays the owner’s own changes caused. Owners face a parallel risk. Directing extra work after the completion deadline without reserving the right to enforce liquidated damages can be interpreted by courts as a waiver of those damages. Address time explicitly in every change order, even when both sides believe the schedule impact is zero.
Verbal Directives and Constructive Changes
Not every change arrives as a neatly drafted document. A constructive change occurs when an owner’s action or inaction forces the contractor to perform work beyond the original scope, even though no formal change order was issued. Common examples include defective specifications that require rework, over-inspection that slows production, acceleration demands when the contractor is entitled to a time extension, and informal field instructions from the owner’s representative that add scope.
To recover costs for a constructive change, the contractor generally must prove four things: that extra work was performed beyond what the contract required, that the owner caused or directed the additional work, that someone with authority ordered or approved it, and that the owner had notice the contractor considered the work a change. That last element is where most constructive change claims fail. A contractor who silently performs extra work and raises the issue months later will struggle to recover, because the owner had no opportunity to limit the cost or choose an alternative approach.
Most contracts require change orders to be in writing, but courts in many jurisdictions have held that an owner who knowingly directs extra work without issuing a written change order has effectively waived the writing requirement. The key factor is whether the owner was aware the work constituted a change. When you receive a verbal instruction that feels like extra work, send written notice that same day identifying the instruction, who gave it, and why you consider it a change.
Keep Working While the Dispute Is Resolved
One of the more frustrating realities of the process is that the contractor almost always must keep working while a pricing or scope dispute is being resolved. Under ConsensusDocs 200, the constructor is required to continue work and maintain the schedule during any dispute, and the owner must continue making payments for undisputed work.8ConsensusDocs. When Is It OK to Say No – The Duty to Proceed and Right to Stop Work AIA A201 contains a similar expectation through its construction change directive mechanism.
The consequences of stopping work unilaterally are severe: termination for default, liability for the cost of hiring a replacement contractor at premium rates, seizure of materials and equipment on site, and exposure to delay and consequential damages. Even threatening to stop work can constitute an anticipatory breach that gives the owner grounds for immediate termination.
There is one narrow exception. The cardinal change doctrine holds that when cumulative changes are so drastic that the contractor is performing work fundamentally different from what was originally agreed upon, the changes constitute a breach of the original contract rather than a legitimate exercise of the changes clause. Courts evaluate cardinal change claims case by case, and the contractor bears a heavy burden of proof. Individual change orders that the contractor finds expensive or inconvenient do not qualify. Short of that threshold, the remedy is to continue working, preserve notice rights, and pursue the disputed costs through the contract’s dispute resolution process, typically a progression from direct negotiation to mediation to arbitration or litigation.
Federal Projects: Extra Layers
Change orders on federal construction projects follow the same general logic but add regulatory requirements under the Federal Acquisition Regulation. The contracting officer has unilateral authority to issue written change orders within the general scope of the contract, covering changes to specifications, methods of performance, government-furnished property, and acceleration of the work.1Acquisition.GOV. 52.243-4 Changes The contractor must comply first and negotiate the equitable adjustment afterward.
The notice deadlines on federal work are particularly rigid. Under FAR 52.243-4, costs incurred more than 20 days before the contractor gives written notice of a constructive change are not recoverable. The contractor must then formally assert its right to an equitable adjustment within 30 days of receiving a written change order or providing notice of a constructive change. No proposal for equitable adjustment is allowed after final payment. Federal contractors who treat these deadlines casually routinely lose otherwise meritorious claims.