Construction change orders work as written amendments to an existing construction contract: a change order adjusts the scope of work, the contract price, the schedule, or some combination of the three, and under the industry’s most widely used form (AIA G701) it becomes enforceable only after the owner, contractor, and architect all sign it.1AIA Contract Documents. G701-2017 Change Order Everything else in the process — notice, pricing, approval, payment — exists to produce that signed document and to make sure the party who performed the extra work actually gets paid for it.
What Triggers a Change Order
Three situations account for most change orders. Design errors and omissions surface during construction, such as a missing structural support required by code or a conflict between mechanical and electrical drawings. Unforeseen site conditions appear once excavation or demolition begins, either conditions that differ from what the contract documents indicated (a geotechnical report showing stable clay when the excavation hits solid rock) or conditions no reasonable contractor would have anticipated for that type of project (an abandoned underground storage tank on a site with no industrial history). And owner-initiated changes cover everything from upgraded finishes to added square footage to simplifications meant to save money. Regulatory shifts during construction, like updated fire codes requiring additional sprinkler coverage, fall into the same bucket.
In the site-conditions category, the contractor carries the burden of showing the condition was genuinely unexpected. In the owner-initiated category, documentation matters just as much even though the change is elective, because the base contract still controls until it is formally amended.
Notice Deadlines That Protect Your Right to Payment
Most change order claims that fail, fail here. Nearly every construction contract requires the party seeking a change to give written notice within a specific window, and missing that window can forfeit the claim entirely, even when the extra work was clearly necessary and performed in good faith.
Under AIA A201-2017, the industry’s most widely used general conditions document, claims must be initiated within 21 days after the event giving rise to the claim, or within 21 days after the claimant first recognizes the condition, whichever is later.2AIA Contract Documents. AIA Document A201-2017 General Conditions of the Contract for Construction That notice goes to the other party and to the Initial Decision Maker, typically the architect. For concealed or unknown conditions discovered during excavation or demolition, the A201 imposes a shorter 14-day window from first observing the condition.
Federal construction contracts use different timelines. Under FAR 52.243-4, a contractor who receives a formal written change order has 30 days to assert its right to a cost or time adjustment. For constructive changes — where the government’s actions effectively require extra work without a formal order — the contractor cannot recover costs incurred more than 20 days before providing written notice.3Acquisition.GOV. FAR 52.243-4 Changes
Courts vary in how strictly they enforce these provisions. Some treat the deadline as an absolute bar; others apply a more forgiving standard if the other party had actual knowledge of the changed condition. Banking on judicial leniency is a losing strategy. The safe move is a written notice sent inside the contractual window, even if the final cost figure comes later. A preliminary notice saying “we believe a change has occurred and will provide detailed pricing within [X] days” preserves the claim while the numbers get worked out.
What a Change Order Must Include
The AIA G701 form provides a clear checklist. It requires five cost figures in sequence: the original contract sum, the net change from all previously authorized change orders, the contract sum before this change order, the dollar amount of the current adjustment, and the new contract sum after the adjustment is applied.4AIA Contract Documents. Instructions for G701-2017 Change Order That running ledger keeps anyone from arguing later about how much the contract has grown.
A detailed description of the changed work has to accompany the form. Vague language like “additional framing as discussed” invites disagreement. The description should spell out exactly what is being added, deleted, or modified, with references to specific drawings or specification sections, and should attach supporting documents (revised plans, photos of site conditions, product data sheets) as exhibits.
A line-item cost breakdown belongs in the backup even though the G701 itself only shows the lump-sum number. Separate labor hours and rates, material quantities and unit costs, equipment charges, and the markups for overhead and profit. Many contracts cap those markups at specified percentages, often in the range of 5% to 10% each for overhead and profit on the direct cost of the changed work. Exceeding a contractual cap in a change order proposal is a quick way to lose credibility with the owner and architect.
The form also requires the preparer to state the number of days the schedule will increase or decrease and the revised date of substantial completion.4AIA Contract Documents. Instructions for G701-2017 Change Order Skipping the time adjustment is a common mistake. If the contract includes liquidated damages for late completion, an unsigned time extension leaves the contractor exposed to daily penalties for delays both parties agreed were justified.
The Approval Workflow
The document typically moves through three stages: preparation, technical review, and owner authorization. The contractor or architect prepares the package with the documentation above. The architect or project manager usually reviews it first, checking proposed costs against site realities and original design intent. That review catches technical errors, like pricing work that was already in the base scope, or underestimating the time impact of a complex modification.
Keep a dated copy of everything you submit, whether submission happens through a digital project management platform or by certified mail. On projects that still use paper, hand-delivery with a signed receipt protects the contractor’s ability to prove timely submission.
After technical review, the document moves to the owner for financial evaluation. The owner decides whether the project budget can absorb the increase or whether scope needs to be scaled back. This back-and-forth can take days or weeks depending on the dollar amount and the owner’s internal approval process. Large institutional owners, government agencies, and developers with lender requirements often have multi-layered chains that slow things down.
Final authorization requires signatures from the contractor, the owner, and the architect.1AIA Contract Documents. G701-2017 Change Order Only after all three signatures land does the change order become an enforceable amendment to the contract. The contractor should not perform the changed work until the fully signed document is in hand.
When a Standard Change Order Is Not the Right Tool
Not every modification follows the same path. Several distinct mechanisms exist, each with different levels of agreement and different risk profiles.
Additive and Deductive Change Orders
An additive change order adds work and increases the contract price. A deductive change order removes scope and reduces the price, typically based on the original bid values for the deleted work so the final invoice reflects only what was actually built. Owners use deductive orders to simplify designs or cut features when the budget tightens.
Construction Change Directives
A construction change directive is used when the owner needs work to proceed immediately but the parties have not yet agreed on price or time. The directive is signed by the owner and architect and sent to the contractor, who must begin the changed work promptly on receipt.5AIA Contract Documents. Instructions for G714-2017 Construction Change Directive This keeps the project from stalling during negotiation.
Payment on directive work proceeds on an interim basis. The contractor submits costs in its regular payment applications, and the architect certifies whatever amount the architect determines to be reasonably justified. Once the owner and contractor reach final agreement on total cost, the directive converts into a formal change order.6AIA Contract Documents. Changes to the Contract: Differences Between Change Orders and Construction Change Directives Pricing is typically handled on a time-and-materials basis with a not-to-exceed cap, by unit prices from the contract, or by another cost method the parties agree on.
Constructive Changes
A constructive change happens when the owner’s actions effectively require the contractor to perform extra work, but nobody issues a formal change order. The owner may not even realize a change has occurred. Common examples: defective plans that force extra work to achieve a buildable result, overly strict inspection standards that reject work meeting the actual specification, or an owner’s refusal to grant a justified time extension that forces the contractor to accelerate.
The doctrine treats these situations the same as a formal change order for cost recovery, but the burden falls entirely on the contractor to identify the change, document it, and submit timely notice. Waiting until the project is over dramatically reduces the chances of recovery.
Cardinal Changes
Every contract has a ceiling on how much the owner can change the work. A cardinal change is a modification, or a cumulative series of modifications, so profound that the project no longer resembles what the contractor originally agreed to build. When that line is crossed, the owner has effectively breached the contract rather than exercised its right to direct changes.
No fixed dollar threshold or percentage automatically triggers the doctrine. Courts evaluate the totality of the changes, asking whether the work being performed is still essentially what the parties bargained for at signing. A single massive scope addition can qualify, and so can a long accumulation of smaller changes that collectively transform the project. A contractor facing a potential cardinal change can negotiate a new change order (possibly converting a fixed-price contract to cost-reimbursable), perform the work and pursue a breach-of-contract claim afterward, or refuse to perform and assert breach. None of these options is simple, which is why tracking cumulative changes as a percentage of original contract value throughout the project is a useful habit.
Why You Cannot Start Work on a Verbal Okay
Verbal agreements about changed work are one of the most expensive mistakes in construction. The field superintendent says “go ahead and do it, we’ll paper it later,” and the paperwork never comes. Or the owner verbally approves an upgrade during a site walk and then disputes the cost when the invoice arrives.
Most construction contracts include a clause requiring all changes to be in writing and signed by authorized parties. When a contractor performs extra work on a verbal instruction and the owner later refuses to pay, courts in many jurisdictions enforce the written-change-order requirement as written. Some courts recognize an exception if the owner stood by and watched the work happen without objecting, under a waiver theory. That argument is fact-intensive and unpredictable.
A contractor who performed extra work without a signed change order may attempt to recover under quantum meruit, which allows recovery for the reasonable value of services provided. The problem: quantum meruit is generally unavailable when the parties already have a contract that addresses how changes are handled. Courts reason that the contractor agreed to a specific change order process, ignored it, and cannot now ask equity to rescue it from its own decision. The narrow exception arises when the owner’s own misconduct or interference made it impossible to follow the contractual procedure.
If the owner or architect pressures you to begin immediately, at minimum send a written confirmation of the verbal instruction by email and note that you are proceeding under protest pending formal documentation. A brief delay to get proper paperwork is almost always cheaper than a six-figure dispute at the end of the project.
Getting Paid on a Signed Change Order
Getting the signatures is only half the job. A few payment mechanics catch contractors by surprise.
Retainage applies to change order work the same way it applies to base contract work. If your contract withholds 5% or 10% retainage from progress payments, expect the same percentage to be held back from change order payments. A $100,000 change order with 10% retainage puts $90,000 in your pocket until the project reaches substantial completion. Factor this into cash-flow planning on projects with a high volume of changes.
State prompt payment laws govern how quickly an owner must pay for approved change order work, with deadlines typically ranging from about 14 to 42 days depending on the jurisdiction. On federal projects, the Prompt Payment Act sets separate timelines. If your contract is silent on payment timing for changed work, the applicable state or federal prompt payment statute fills the gap. Late payment often triggers mandatory interest, so tracking payment deadlines on change orders is worth the effort.
For construction change directives where the final price has not been settled, AIA A201-2017 lets the contractor include completed directive work in regular payment applications. The architect makes an interim determination of what is reasonably owed and certifies that amount, with final reconciliation happening once the directive converts to a formal change order. This keeps cash flowing during negotiation, though the interim amounts are subject to later adjustment in either direction.
Bonding Consequences on Larger Changes
On bonded projects, significant price increases can trigger additional bonding obligations. On federal construction projects, the government may require additional performance and payment bond protection equal to 100% of the increase in contract price, secured either by increasing the penal amount of the existing bond or by obtaining a separate additional bond.7Acquisition.GOV. FAR 52.228-15 Performance and Payment Bonds – Construction
Surety consent is another requirement contractors frequently overlook. When a contract modification involves new work beyond the original scope, or when the price change exceeds 25% of the contract value or $50,000 (whichever is less), the contracting officer must obtain the surety’s written consent before the modification takes effect.8eCFR. 48 CFR 28.106-5 Consent of Surety Failing to notify the surety of major scope changes can jeopardize bond coverage at the worst possible time. Private projects follow similar logic: most surety agreements require the contractor to notify the surety of material changes to the bonded contract, even where federal procurement rules do not apply.