Change orders in the United States

American change-order practice has more doctrine in it than anyone else's. Two doctrines carry names here that no other jurisdiction this site covers uses — constructive change and cardinal change — both born in federal contracting and both since carried into state and private work. The owner, not the contractor, stands behind the adequacy of the specifications it chooses to impose. And the most common way a sound change claim dies is not a lost argument about entitlement. It is a signature.

This is the orientation page. Four deeper pages sit under it, and each exists because the American answer diverges from the general one — sometimes by more than a reader expects.

A note on sources. The FAR clauses cited across this cluster were read on acquisition.gov under FAC 2026-01. The California statutes were read on the Legislature's own site. AIA A201–2017 wording is quoted only from AIA's own complete 38-page sample of the form, read in full on 22 September 2026. The shorter sample AIA now serves from its main site is a 15-page extract that stops in Article 3 and cannot support any Article 4, 7, 9 or 15 wording. ★ Several copies circulating as "A201-2017" are owner-modified editions that renumber Article 7 entirely. Never take standard-form numbering from one, and read your own executed contract, which will almost always amend the form.

Five things that orient a US change dispute

1 · Two doctrines no other jurisdiction this site covers has by name. Constructive change is the claim for a change nobody formally ordered. The Federal Circuit states it in two elements: work beyond the contract's requirements, and an order — express or implied — attributable to the government. Bell/Heery v United States, 739 F.3d 1324, 1335 (Fed. Cir. 2014). Cardinal change is the claim that the owner has changed the job so far that it is no longer the job the contractor agreed to build: "an alteration in the work so drastic that it effectively requires the contractor to perform duties materially different from those originally bargained for". Rumsfeld v Freedom NY, Inc, 329 F.3d 1320, 1332 (Fed. Cir. 2003), quoting Krygoski Construction Co v United States, 94 F.3d 1537, 1543 (Fed. Cir. 1996). The two are different claims with different consequences, and they are frequently confused.

2 · The owner stands behind its specifications — within limits. United States v Spearin, 248 U.S. 132 (1918), implies a warranty that specifications the contractor is bound to build to are adequate. It is the exact opposite of the English default. It is also narrower than it is usually stated: it is implied, it reaches specifications the contractor is bound to build to (later cases frame this as design, not performance, specifications — the words are not in Spearin), and it operates as an exception to the ordinary rule that a fixed-price contractor bears the cost of difficulty.

3 · The release on the change order is a genuine claim-killer. No comparable body of doctrine has been located in the other jurisdictions this site covers, and Bell BCI Co v United States is why. The Court of Federal Claims awarded the contractor over $6.2 million, including cumulative-impact inefficiency, having rejected the government's accord-and-satisfaction defence, 81 Fed. Cl. 617 (2008). The Federal Circuit disagreed: the release language in the bilateral modification was unambiguous, and the trial court "clearly erred in holding that Bell did not release its cumulative impact claims attributable to that modification". 570 F.3d 1337 (Fed. Cir. 2009). The disposition was affirmed in part, vacated in part and remanded — so the case is not authority that one early release caught every later change. It is authority that every unreserved signature is exposure.

4 · Who can bind the owner depends on who the owner is. On private work a written-change-order requirement can be waived by the owner's conduct. On public work the rule changes character: the question stops being whether the formality was waived and becomes whether the person who directed the work had the authority to change the contract at all. Estoppel does not supply authority a public body's officer did not have. On federal work, only a Contracting Officer binds the government; apparent authority is not enough, and implied actual authority is unavailable where the contract gives modification power exclusively to the Contracting Officer, as federal construction contracts commonly do (Opinion). Winter v Cath-dr/Balti Joint Venture, 497 F.3d 1339 (Fed. Cir. 2007). What rescues a federal contractor in practice is ratification and the contract's own clauses.

5 · Unilateral, priced-later instruments are standard. The AIA Construction Change Directive (A201–2017 §7.3) and the FAR unilateral change order (52.243-4(a)) both compel the contractor to perform unpriced work, with a valuation mechanism behind them. That is what makes the American system work at speed — and it is why the notice and reservation discipline around those instruments carries so much weight.

The four routes

For the jurisdiction-neutral treatment, see the variations pillar. For the time side of the same project, see extension of time in the United States.

REA or claim — the fork that controls everything downstream

On federal work, a contractor seeking more money for a change chooses — sometimes without noticing it has chosen — between two instruments.

A Request for Equitable Adjustment is a contractual mechanism for negotiating an adjustment. A claim under the Contract Disputes Act is a written demand as of right, seeking a Contracting Officer's final decision. They are not interchangeable, and treating an REA as though it were a claim is itself an error.

★ The two certification thresholds are not aligned, and the DFARS figure moved on 1 October 2025. A great deal of published material still gives $250,000. It is out of date.

The notice layer

Two clocks matter most, and they work differently.

AIA A201–2017 §15.1.3.1 gives 21 days to initiate a Claim: Claims "shall be initiated within 21 days after occurrence of the event giving rise to such Claim or within 21 days after the claimant first recognizes the condition giving rise to the Claim, whichever is later." This site's claim clocks page states the same period.

FAR 52.243-4(d) does not bar a constructive-change claim for late notice. It cuts off costs incurred more than 20 days before the contractor gives the written notice the clause requires — except for an adjustment based on defective specifications, which the cut-off does not reach — so a late notice shrinks the claim rather than killing it. Where the Government is responsible for defective specifications, the adjustment includes "any increased cost reasonably incurred by the Contractor in attempting to comply". The live notice and time bars page takes the same view of the cut-off. The consequence is that on federal work, outside defective specifications, the damage from late notice is arithmetic, and it compounds every week the notice is not sent.

The FAR is mid-overhaul — read the clause in the contract, not the regulation

The Revolutionary FAR Overhaul (Executive Order 14275, April 2025) is proceeding by class deviation, agency by agency, with formal rulemaking behind it.

• The Changes clauses survived. Part 43 and FAR 52.243-1 through 52.243-7 were retained.
• ★ On 18 September 2026 the FAR Council proposed rules for Parts 14, 28 and 36 and related Part 52 clauses (FAR Case 2026-010), with comments due 19 October 2026. [PARTIAL] Its preamble, read twice independently, does not mention 52.243-4; the amendatory text was not read in full. The same proposal would remove several 52.236 clauses and is considering renumbering the construction clauses into a new subpart 52.4 — which reaches the Differing Site Conditions clause, 52.236-2.
• No proposed rule has issued for Part 43 as at 22 September 2026.
• ★ The rule for any federal change dispute: read the clause as it was incorporated into your contract. A contract awarded under the June 2007 text keeps the June 2007 text, whatever the agency's administering procedures now say.

The Contract Disputes Act itself is statutory and none of this touches it — the six-year limitation, the $100,000 certification threshold, the Contracting Officer's final decision and the appeal elections all sit in the Act. The FAR text that implements it is another matter: FAR Part 33 is within the 23 June 2026 proposed rule for Parts 1, 2, 4, 33 and others, which proposes removing the Disputes clause's duty-to-proceed paragraph, 52.233-1(i). Cite 33.207, 33.208 and 52.233-1 as incorporated in your contract.

The forms, as at September 2026

• AIA A201–2017 remains the current General Conditions. No announcement of a 2027 revision had been located as at 22 September 2026, though the ten-year cycle (1997 → 2007 → 2017) makes one the natural expectation.
• ★ Article 7 numbering moved between the 2007 and 2017 editions, and commentary quoting 2007 numbers against 2017 contracts is everywhere. In 2017 the Architect's determination of a Construction Change Directive is §7.3.4 (it was §7.3.7): reasonable expenditures and savings attributable to the change, with costs "limited to" a closed list of five heads, plus "an amount for overhead and profit as set forth in the Agreement, or if no such amount is set forth in the Agreement, a reasonable amount". The duty to proceed promptly is §7.3.6 (it was §7.3.5). And §4.2.8: "The Architect will prepare Change Orders and Construction Change Directives, and may order minor changes in the Work as provided in Section 7.4." Prepare, not issue — a Change Order also needs the Owner's and Contractor's signatures (§7.2.1), and a Construction Change Directive the Owner's (§7.3.1).
• ★ Mediation is §15.3; arbitration is §15.4. Both are frequently cited one number off.
• The AIA 2024 Design-Build family was released 22 January 2025, and A141–2024 carries its own general conditions — A201 is not incorporated into the design-build documents.

California's statutory change-order procedure

Cal. Civ. Code § 8850, added by SB 440 (Stats. 2025, ch. 583) and in force from 1 January 2026, gives private-works contractors a statutory claim procedure: a written claim, a 30-day written response obligation on the owner, deemed denial if the owner misses it, payment of the undisputed portion within 60 days, 2% per month interest, mandatory non-binding mediation, and a stop-work route. It applies only to contracts entered into on or after 1 January 2026, excludes smaller residential projects, and repeals itself on 1 January 2030.

Its public-works counterpart, Pub. Contract Code § 9204, was due to sunset on 1 January 2027. ★ It will not: SB 33 (Stats. 2026, ch. 99, approved 16 July 2026) removed the repeal date, with effect from 1 January 2027.

California is not the only state to legislate on change-order money. Comparison, labelled — neither statute was researched beyond what follows. Nevada, NRS 624.610, goes further on silence: if the owner, within 30 days after the prime contractor submits a written request for a change order, neither issues the change order nor gives written reasons for refusing it, the contract price and the time for performance are increased by the amounts sought, and the owner pays with the next progress payment; the section also gives the prime contractor a right to stop work on 10 days' written notice in the circumstances it sets out. UNVERIFIED NRS 624.622 sets out exemptions from these provisions; they were not read, so check that your project is inside the section before relying on it. Massachusetts, G.L. c. 149 § 29E, deems a written change-order request on a private construction contract of $3 million or more approved if the owner neither approves nor rejects it within the permitted period, which may not exceed 30 days. SINGLE-SOURCE one read of the statutory text; its enactment year was not verified.

★ Neither California statute is adjudication. Both lead with time extensions and relief from delay damages, and both end in non-binding mediation. (Inference.) Nevada's and Massachusetts's deemed-approval rules are defaults triggered by silence, not decisions by anyone. No statutory adjudication — an independent determination binding in the interim — for a change-order dispute was located anywhere in the United States, which is the structural difference between American practice and Ontario, Australia or the United Kingdom. The California page sets out the procedure from the statute's text and works through its collisions with A201–2017.

Where US change claims actually die

Five places, and only one of them is about entitlement:

1. The signature. A bilateral modification priced at direct cost, signed without a reservation that names what is being kept open. After Bell BCI, the release language will be read for what it says.
2. Authority. The work was directed by someone who could not change the contract. On public work that is fatal far more often than contractors expect; on federal work it turns on whether the Contracting Officer ratified.
3. Notice, and the arithmetic of costs cut off by it.
4. The wrong instrument. An REA treated as a claim, or a claim that was never certified, so interest never started and there was nothing to appeal.
5. Overreach on cardinal change. The threshold is very high, cost multiples alone do not meet it, and a contractor that stops work on the strength of its own view that a change is cardinal risks being the party in breach.

Every one of those is decided by the paper trail made at the time of the change. The releases page carries reservation language that has been tested, and the written instruction page sets out who, on each kind of project, can actually bind the owner.

A comparison, clearly labelled

The Canadian layer of this cluster (being prepared for publication) reached almost the opposite conclusions on three of these points. No Canadian authority adopting constructive change by that name was located; Canada has contractual routes and a breach claim. Canada has no Bell BCI; the bar there operates through price finality and two notice gates in CCDC 2 – 2020. And Ontario does have binding interim adjudication of change-order money, where no American jurisdiction located does. Readers working on both sides of the border should not assume the analysis travels.

About this material Library content is general information about construction claim practice, not legal advice. Entitlement, deadlines and procedure are governed by your own contract and by the law of the place the work is performed. Reviewed September 22, 2026 · Report a correction