Cardinal change in the United States

Every changes clause has an outer edge. Inside it, the owner orders and the contractor performs and is paid through the clause. Past it, the owner is no longer exercising a contract right — it is in breach. US law calls that a cardinal change. It is a US doctrine; other systems police the same boundary through the wording of the variation power. The doctrine takes a sentence to state. The remedy — breach damages, a right to stop, or reasonable value with the contract set aside — depends on forum, state and owner, and is most of this page.

Cardinal change is often confused with constructive change, which is a different doctrine with a different remedy. See constructive change in the United States.

A note on sources. FAR clauses were read on acquisition.gov (FAC 2026-01). Read the clause as incorporated in your contract, not the FAR — the FAR Overhaul runs through agency class deviations. Case quotations were checked against published texts of the opinions; where only commentary was available, the page says so.

The short answer

The textual hook is FAR 52.243-4 (JUN 2007), paragraph (a). Under it the Contracting Officer may "make changes in the work within the general scope of the contract." An order outside that scope is not authorised by the clause. The clause therefore cannot compel the work or supply the price, so the claim becomes a claim for breach.

The Federal Circuit's standard formulation is in Rumsfeld v Freedom NY, Inc, quoting Krygoski Construction Co. v United States, 94 F.3d 1537, 1543 (Fed. Cir. 1996). A cardinal change "occurs when the government effects an alteration in the work so drastic that it effectively requires the contractor to perform duties materially different from those originally bargained for."

Two policies drive it, and only one travels: protecting the contractor from a different bargain, and protecting competitive procurement from a sole-source contract created by modification. The second is the source of the protest mirror below and has no private-work counterpart — one reason the doctrine sits less securely in state law.

Cardinal change is not constructive change. A constructive change is in-scope work ordered informally and priced under the clause, subject to FAR 52.243-4(b)'s notice condition. A cardinal change is out-of-scope work that the clause cannot redress; it sounds in breach.

The test

There is no formula. The key authorities are Wunderlich Contracting Co. v United States, quoted for "giving just consideration to the magnitude and quality of the changes ordered and their cumulative effect upon the project as a whole"; Edward R. Marden Corp. v United States, quoted in Freedom NY for "it is the entire undertaking of the contractor, rather than the product, to which we look" — a cardinal change can occur even when the finished product is the same; and Air-A-Plane Corp. v United States, asking whether the modified job is essentially the same work the parties bargained for.

Becho, Inc. v United States stated that there is "no precise calculus," and listed the factors courts weigh: whether the magnitude of the work changed significantly; whether the change procures a totally different item or drastically alters the quality, character, nature or type of work; whether the cost of the ordered work greatly exceeds the original price.

Cardinality is principally a question of fact (Becho), so it is won or lost on the project record, rarely on a motion.

The threshold is very high, and a cost multiple alone rarely clears it

Magnitude is a factor. It is almost never enough by itself. The cases turn on whether the kind of undertaking changed.

Miller Elevator put General Dynamics and Kiewit side by side to make the point: "No rule of thumb exists." An increase of roughly 167% was within scope; a treble rise in cost was not.

The working view: plead a change of kind, not of degree. Show that the method, risk profile, trades or skills became something the bid did not contemplate, and that the contract documents did not warn of it. Cost growth supports the case; it is not the case. Two traps: in open-and-inspect, indefinite-quantity or design-development contracts, heavy change is the bargain (Boston Shipyard); and a long list of modifications shows transformation but also shows the changes were being administered through the clause.

What a finding actually gets you — the remedy question

Three different remedies are in play, and the cases do not always keep them apart.

The federal position. A cardinal change is a material breach, and the Federal Circuit has said such a breach frees the contractor from its contract obligations, including those under the Disputes clause: Alliant Techsystems, Inc. v United States. The obligation that matters is FAR 52.233-1 (MAY 2014)(i): the Contractor "shall proceed diligently with performance of this contract, pending final resolution of any request for relief, claim, appeal, or action arising under the contract, and comply with any decision of the Contracting Officer." Alternate I (DEC 1991) widens it to disputes "arising under or relating to" the contract. [EDITION ALERT] The proposed Part 33 rule, FAR Case 2026-001 (23 June 2026), would remove paragraph (i) in favour of the Alternate I language. Check your contract's text.

But on its facts Alliant found no drastic modification, so Alliant had to keep performing. The release belongs only to a contractor who is right.

The dilemma. Allied Materials & Equipment Co. v United States: "The cautious contractor might often proceed under the revised contract because of doubt whether he could invoke the cardinal change doctrine." Boston Shipyard shows why: the yard stopped work, called the changes cardinal, and lost — they were not. Performing has a price too. In Fuller Co. v Brown Minneapolis Tank & Fabricating Co., a subcontractor that continued after assumed cardinal changes had made an election: it stayed bound by the contract's terms and was left to damages. On federal work a declaration is available — Alliant upheld Court of Federal Claims jurisdiction over a pre-performance non-monetary claim under 28 U.S.C. § 1491(a)(2) — but the same opinion held the contractor had to keep working meanwhile.

So: perform under protest, reserve specifically on every modification, segregate costs from the day scope moved, and litigate cardinality afterwards.

The measure is breach damages, not a blank cheque. It is often said that a finding makes every contractual limitation fall away. The authorities located do not go that far. Amelco Electric v City of Thousand Oaks: "There is no hint in any Federal Circuit or Court of Claims case to which we have been directed that the terms of the federal contract are held inapplicable or set aside for the period prior to the breach." Litton Systems, Inc. v Frigitemp Corp.: even if the doctrine applied, relief would be breach damages, not quantum meruit. SINGLE-SOURCE Turner Construction Co. v M.J. Flaherty Co. (Mass. Super. Ct. 2017) is reported to have held that a cardinal change did not displace a consequential-damages waiver.

The working view: the duty to proceed falls away if you are right; notice and pricing machinery arguably do not reach work the clause never authorised; but assume other risk-allocation terms — consequential-damages waivers, caps, no-damage-for-delay clauses — survive unless your forum has held otherwise.

Sureties. FAR 52.243-4(a) dispenses with notice to sureties only for changes "within the general scope of the contract." (Inference.) An out-of-scope change falls outside the surety's advance consent — the basis of the surety-discharge defence. Check the bond's own wording.

California: Amelco, stated precisely

The Court of Appeal, Amelco Electric v City of Thousand Oaks, 82 Cal. App. 4th 373, 98 Cal. Rptr. 2d 159 (2000), upheld recovery against a city on an abandonment theory. It was reversed: Amelco Electric v City of Thousand Oaks. Anything still citing the 2000 decision for the abandonment theory is citing bad law. The Supreme Court held three things, and no more:

1. Abandonment is unavailable against a public entity. The court concluded that "the theory of abandonment does not apply against a public entity"; otherwise "the notion of competitive bidding would become meaningless."
2. The rule is confined to public entities. The California abandonment cases (Opdyke & Butler v Silver, 111 Cal. App. 2d 912; C. Norman Peterson Co. v Container Corp. of America, 172 Cal. App. 3d 628) were distinguished "on the ground they involved private, not public, parties." Abandonment survives between private parties — including a subcontractor against its prime on a public job: Sehulster Tunnels/Pre-Con v Traylor Brothers, Inc./Obayashi Corp., 111 Cal. App. 4th 1328 (2003).
3. Cardinal change was left open: "We therefore do not reach the issues of whether the cardinal change theory applies in California."

Amelco's total-cost damages also failed for a separate reason — it never showed it was not responsible for the added costs.

What Amelco is not: a general US rule, or a rejection of cardinal change. Elsewhere, whether abandonment runs against a public owner is that state's question. In California, against a public entity, plead breach — cardinal change as breach — not abandonment. The competitive-bidding reasoning is the same reasoning behind the protest mirror below.

The waiver problem — two rules that get conflated

Did signing the modifications waive the cardinal change?

Both lines are live.

Barring the claim. Williams Building Co. v Department of State: bilateral modifications addressing the very document substitution later called cardinal released "any and all liability." Watt Plumbing, Air Conditioning & Electric, Inc. v Tulsa Rig, Reel & Manufacturing Co.: "An alteration of a contract cannot constitute a breach of contract because it becomes a part of the contract." In Boston Shipyard the signed modification was an accord and satisfaction of the claims then existing; the cardinal argument about later changes failed on its merits.

Not barring the claim. In Saddler the contractor protested, signed the change order, accepted final payment — and still recovered. Atlantic Dry Dock Corp. v United States refused summary judgment despite some 130 change orders: the releases on their face reached only claims arising out of each modification, and a cumulative cardinal effect cannot be known until the project is complete or nearly so.

The reconciliation: read the release words (a release confined to the priced change leaves the cumulative claim alive; an "any and all liability" release addressed to the same facts does not), and ask whether the cumulative effect was knowable at signature. Same analysis, same drafting discipline, as change order releases: reserve cumulative impact and cardinality expressly, on every modification.

Blue & Gold — a bid-protest rule, not a cardinal-change rule

Blue & Gold Fleet, L.P. v United States: a party that could have objected to a patent error in a solicitation before the close of bidding, and did not, waives it in a later Court of Federal Claims protest. Utech, Inc. v United States: the close of bidding is the proposal submission deadline, not award.

[CONFLICT] — framing error. Blue & Gold is sometimes presented as "the cardinal-change waiver problem." It involves a different party (a would-be offeror), forum (a protest) and remedy (setting aside a procurement). Its relative, the pre-bid duty to inquire about patent ambiguities, does appear in scope disputes — as the owner's answer to "it was never in scope," not as a post-award waiver of a cardinal change.

The protest mirror — an out-of-scope modification is an unlawful sole-source procurement

Under the Competition in Contracting Act (41 U.S.C. § 3301; for defence agencies, 10 U.S.C. § 3201), a modification beyond the original scope is in substance a new procurement awarded without competition. AT&T Communications, Inc. v Wiltel, Inc. drew the line in cardinal-change terms but recast the question: not whether the government breached, but whether the modification changed the contract enough to circumvent the statutory requirement of competition — including whether the solicitation adequately advised offerors of the potential for that type of change. (The Wiltel modification was held within scope.)

GAO does not generally review contract administration (4 C.F.R. § 21.5(a)), but makes an exception "where a protest alleges that a contract modification changes the work from the scope of the original contract." Zodiac of North America, Inc. weighs "the extent of any changes in the type of work, performance period, and costs"; "whether the original solicitation adequately advised offerors of the potential for the change or whether the change was the type that reasonably could have been anticipated"; and "whether the modification materially changed the field of competition." The best-known sustain, Leupold Stevens, Inc., involved a design change the solicitation expressly prohibited and about $9.3 million added to a roughly $12 million contract.

NEGATIVE FINDING No 2024–2026 GAO or Court of Federal Claims decision sustaining an out-of-scope-modification protest was located in two targeted searches on 22 September 2026 — not a finding that none exists.

Why a contractor should care:

1. Your out-of-scope modification can be taken away. A sustained protest can end with the work being competed. The state-law version is harsher: in Albert Elia Building Co. v New York State Urban Development Corp., a disappointed contractor challenged a tunnel change order as unbid work; the court held it a new undertaking and ordered the contractor that built it to refund the difference between its negotiated price and what a bidding contractor would have charged.
2. Expect the owner to run the mirror as a defence — "if this were cardinal we could not have ordered it from you, so it is in scope." The tests share vocabulary but serve opposite parties; a modification can be in scope for protest purposes yet cardinal as between the parties, and vice versa.
3. Keep your positions consistent. "In scope" to defeat a protest and "cardinal" in your breach claim will be quoted against each other.

State-law reception is not uniform

The circulating statistic — nine states adopted, four rejected — does not survive a check against the cases. The adopting list mixes state high-court holdings, federal predictions of state law, cases that applied the test only to find no cardinal change, and abandonment cases. The rejecting list is entirely federal predictions.

Hancock Electronics Corp. v Washington Metropolitan Area Transit Authority, 81 F.3d 451 (4th Cir. 1996), often counted as an adoption, is not a state authority at all: the Fourth Circuit applied federal government-contract principles to a transit authority's contract, and found no cardinal change.

What the table supports: only Nevada has expressly adopted the doctrine at state high-court level (private work). The high courts of Maine, Oklahoma and Wyoming have discussed it and declined to apply it on the facts; three federal courts have predicted that Ohio, Mississippi and New Jersey would not recognise it; California has left it open. In most other states it is undecided. Check your own state's high court before pleading — a state that has not adopted the doctrine may still have spoken to it, as Maine and Wyoming have.

★ Subcontractors, read Scherer. The claim a subcontractor most often wants to bring is cardinal change against a prime contractor for changes the owner ordered. Wyoming's supreme court has declined to extend the doctrine to exactly that defendant. (Opinion.) Where the prime did not order the change, plead the pass-through and the subcontract's own changes and pricing machinery, not cardinal change against the prime alone. Plead in the alternative — breach of the changes clause, abandonment where available against that owner, quantum meruit where the contract is displaced. (Semac Electric Co. v Skanska USA Building, Inc., 195 Conn. App. 695 (2020), an intermediate appellate court, is described by commentators both as recognising the doctrine and as rejecting the claim on its facts; it is not scored here.)

Checklist before you plead it

1. Find the limiter in your changes clause — "within the general scope" or its equivalent (FAR 52.243-4(a); on AIA work, A201–2017 §7.3.1 lets the Owner order changes by Construction Change Directive "within the general scope of the Contract"). No limiter, no textual hook.
2. Prove kind, not degree: undertaking as bid against undertaking as performed. Cost last.
3. Say "cardinal" in writing, early, with reasons — and on federal work preserve the FAR 52.243-4(b) constructive-change route in the alternative.
4. Keep performing and reserve on every modification, unless you are certain.
5. Check owner type and state — California public entity: breach, not abandonment.

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