6.1 Conditions: Express, Constructive & Excuse

Key Takeaways

  • A condition is an event, not certain to occur, that must occur (unless excused) before performance under a contract becomes due (Restatement (Second) of Contracts § 224).
  • Express conditions require strict, literal compliance; failure of an express condition discharges the conditional duty without liability, whereas breach of a promise creates liability for damages.
  • Under the preference for promises doctrine (Restatement § 227), ambiguous contractual language is construed as a covenant/promise rather than an express condition to avoid forfeiture.
  • Satisfaction conditions are governed by an objective reasonable person standard for commercial fitness, operability, and mechanical utility, but by a subjective honest dissatisfaction standard for personal taste, fancy, and aesthetics.
  • Non-occurrence of a condition is legally excused through wrongful prevention or hindrance, voluntary waiver, estoppel, extreme disproportionate forfeiture, or objective impossibility.
Last updated: September 2026

Conditions: Express, Constructive & Excuse

Doctrinal Foundation: In contract law, the duties of the parties to perform may be absolute or conditional. An absolute duty is unconditional; failure to perform immediately constitutes a breach. A conditional duty, by contrast, is dependent upon the occurrence or non-occurrence of an uncertain future event. Under Restatement (Second) of Contracts § 224, a condition is defined as "an event, not certain to occur, which must occur, unless its non-occurrence is excused, before performance under a contract becomes due." Mastery of conditions is critical for the FYLSE because mischaracterizing a term as a promise rather than a condition—or vice versa—completely alters the legal remedies and defenses available to the parties.


I. Conditions vs. Promises: The Fundamental Distinction

On the FYLSE, candidates must immediately distinguish between a promise (covenant) and a condition. Confusing these concepts is one of the most common analytical errors on the exam.

                          ┌──────────────────────────────────────┐
                          │     Contractual Commitments          │
                          └──────────────────┬───────────────────┘
                                             │
                  ┌──────────────────────────┴──────────────────────────┐
                  ▼                                                     ▼
        [Promise / Covenant]                                  [Express Condition]
- Commitment to act or refrain                       - Event triggering or discharging duty
- Words: "promises", "agrees", "shall"               - Words: "if", "provided that", "subject to"
- Breach yields damages                              - Non-occurrence discharges duty
- Does not excuse other party unless material        - Strictly enforced; no damages unless promissory

1. Promise (Covenant)

  • Definition: A manifestation of intention to act or refrain from acting in a specified way, made so as to justify a promisee in understanding that a commitment has been made.
  • Linguistic Markers: Phrases such as "Buyer covenants," "Contractor agrees to," "Party A shall," "Vendor undertakes."
  • Legal Consequence of Breach: The failure to perform a promise is a breach of contract. It gives rise to a cause of action for damages. However, breach of a promise does not automatically excuse the other party's reciprocal performance unless the breach is material.

2. Condition

  • Definition: An operative fact or event (other than the mere lapse of time) that activates, suspends, or extinguishes a legal duty of performance.
  • Linguistic Markers: Express conditional language includes "if," "provided that," "on condition that," "subject to," "in the event that," "contingent upon."
  • Legal Consequence of Non-Occurrence: If a condition fails to occur, the conditional duty does not arise or is discharged. Non-occurrence is not a breach of contract and does not support an action for damages, unless the party also promised that the condition would occur.

3. Promissory Condition

  • Definition: A contractual term that operates as both a promise and a condition. The promisor covenants that an event will occur, and the promisee's return duty is expressly conditioned upon that occurrence.
  • Example: In a commercial purchase agreement: "Buyer covenants to obtain an irrevocable loan commitment by June 1, and Seller's obligation to convey title is expressly conditioned upon Buyer obtaining such commitment."
  • Legal Consequence: If the event fails to occur, the conditional duty of the other party is discharged, and the failing party is liable for damages for breach of promise.

4. Preference for Promises (The Presumption Against Conditions)

Because the non-occurrence of an express condition results in the strict forfeiture of the obligor's contractual rights without compensation, courts follow a strong interpretive presumption: In cases of doubt, contractual language is construed as a promise rather than an express condition (Restatement (Second) of Contracts § 227(1)).

[!IMPORTANT] The Forfeiture Avoidance Rule on the FYLSE: If an agreement uses ambiguous phrasing such as "Contractor will install the roof, it being understood that Owner pays when the loan funds," courts interpret the funding of the loan not as an express condition precedent to payment, but as a timing mechanism fixing a convenient time for payment. If the loan never funds through no fault of either party, Owner remains legally obligated to pay within a reasonable time.


II. Classifications of Conditions: Source and Timing

Conditions are classified according to how they are created (source) and when they operate in relation to contractual duties (timing).

Source Classifications

ClassificationSource & NatureStandard of ComplianceEffect of Non-Occurrence
Express ConditionExplicitly agreed to and drafted by the parties using conditional language.Strict, literal compliance required. Substantial performance does not apply.Discharges the conditional duty entirely; forfeits right to return performance.
Constructive Condition (Implied-in-Law)Imposed by the courts to regulate the order of performance and prevent injustice (Kingston v. Preston).Substantial performance is sufficient.Minor breach does not excuse; material breach suspends or discharges return duty.
Implied-in-Fact ConditionInferred from the conduct, course of dealing, or nature of the transaction.Reasonable or substantial compliance depending on context.Suspends or excuses dependent performance.

Timing Classifications (Precedent, Concurrent, Subsequent)

1. Condition Precedent

  • Rule: An event that must occur before a party's duty of performance becomes immediate and operative.
  • Procedural / Evidentiary Rule: The plaintiff bears the burden of pleading and proving the occurrence (or excuse) of all conditions precedent to establish the defendant's breach.
  • Example: An insurance policy stating: "The insured must submit a sworn proof of loss within 60 days before the insurer is obligated to pay benefits."

2. Condition Concurrent

  • Rule: Mutual, dependent conditions that are capable of simultaneous performance and are agreed to be performed at the same time.
  • Tender Requirement: Neither party is in breach until the other party tenders (offers and demonstrates present ability to execute) performance. Tender by one party is a condition precedent to the other party's duty to perform.
  • Example: The standard real estate closing: Delivery of the deed by the seller and payment of the purchase price by the buyer are concurrent conditions.

3. Condition Subsequent

  • Rule: A rare event whose occurrence terminates or discharges an already existing, operative legal duty of performance.
  • Procedural / Evidentiary Rule: The defendant bears the burden of pleading and proving the occurrence of a condition subsequent as an affirmative defense.
  • Example: A commercial liability contract stating: "Insurer is immediately obligated to defend and indemnify the insured upon an occurrence; provided, however, that Insurer's obligation shall terminate if Insured fails to file a formal action within 12 months after claim denial."

III. Satisfaction Conditions: Objective vs. Subjective Standards

Contracts frequently make a party's payment obligation conditioned upon that party's—or an independent third party's—"satisfaction" with the performance. The legal standard applied depends on the subject matter of the contract:

                         ┌──────────────────────────────────────┐
                         │   Standards for Satisfaction Clauses │
                         └──────────────────┬───────────────────┘
                                            │
                  ┌─────────────────────────┴─────────────────────────┐
                  ▼                                                   ▼
       [Objective Standard]                                 [Subjective Standard]
- Commercial utility, fitness, construction          - Personal taste, fancy, aesthetics, art
- "Reasonable Person" test                           - "Honest / Good Faith Dissatisfaction"
- Operates if reasonable person satisfied            - Genuine dissatisfaction excuses duty
- Dissatisfaction must be reasonable                 - Unreasonable dissatisfaction allowed if honest

1. The Objective Standard (Commercial Utility, Fitness, Construction)

  • Applicability: Applies to contracts involving mechanical utility, operational fitness, structural integrity, or commercial value (e.g., manufacturing machinery, installing HVAC units, constructing a warehouse, paving a parking lot).
  • Test: The condition is met if a reasonable person in the obligor's position would be satisfied. If the performance conforms to standard commercial specifications, the obligor cannot withhold payment, even if they subjectively claim dissatisfaction.

2. The Subjective Standard (Personal Taste, Fancy, Art, Aesthetics)

  • Applicability: Applies to contracts involving personal taste, individualized artistic judgment, or personal comfort (e.g., painting a portrait, tailoring custom clothing, composing a musical score, sculpting a monument).
  • Test: The obligor's personal, subjective satisfaction is required. The court will not inquire whether a reasonable person would be satisfied.
  • Limitation (Good Faith Requirement): The obligor's dissatisfaction must be honest and in good faith. If the obligor is actually satisfied but asserts dissatisfaction as a pretext to escape a bad bargain, the condition is excused, and the obligor is in breach.

3. Third-Party Satisfaction (Architect / Engineer Certificates)

  • In construction contracts, owner payments are routinely conditioned upon obtaining a certificate of completion from an independent architect or engineer.
  • Rule: The condition is strictly enforced. The owner's duty to pay does not arise without the certificate.
  • Excuse: The requirement of an architect's certificate is excused if the architect refuses the certificate due to fraud, collusion with the owner, bad faith, gross mistake, or failure to exercise honest judgment.

IV. Doctrines Excusing the Non-Occurrence of Conditions

Where an express condition has failed to occur, a party seeking to enforce the contract may overcome the defense by demonstrating that the condition was legally excused. Five primary doctrines excuse conditions:

1. Wrongful Prevention or Hindrance (Doctrine of Prevention)

  • Rule: Under Restatement (Second) of Contracts § 245, if a party whose duty is subject to a condition wrongfully prevents, hinders, or substantially interferes with the occurrence of that condition, the condition is excused, and the party's duty of performance becomes absolute.
  • Underlying Principle: Every contract contains an implied covenant of good faith and fair dealing, requiring neither party to do anything that will destroy or injure the right of the other party to receive the fruits of the contract.
  • Classic Exam Scenario: A buyer signs a purchase contract conditioned upon securing a 6% mortgage loan by July 1. The buyer never submits a loan application, refuses to furnish financial records to prospective lenders, and lets the deadline pass. The condition of obtaining financing is excused by the buyer's wrongful prevention, and the buyer is obligated to close or pay damages.

2. Voluntary Waiver

  • Rule: A waiver is the voluntary, intentional relinquishment of a known legal right. A party whose duty is subject to a condition may waive that condition by express words or conduct indicating they will not insist on its occurrence.
  • Executory Waiver vs. Retraction:
    • If the condition is waived after the time for its occurrence has passed, the waiver is permanent and cannot be retracted.
    • If the condition is waived before the time for its occurrence (an executory waiver), the waiving party may retract the waiver and reinstate the condition by giving reasonable notice to the other party, provided the other party has not materially changed their position in reliance on the waiver (Restatement (Second) of Contracts § 84).
  • Limitation: A party may waive a condition inserted solely for their own benefit, but cannot waive a condition that forms a material part of the agreed exchange without separate consideration.

3. Estoppel

  • Rule: When a party by words or conduct represents that they will not insist upon strict compliance with a condition, and the other party reasonably and foreseeably changes their position in detrimental reliance on that representation, the party is equitably estopped from enforcing the condition.

4. Avoidance of Disproportionate Forfeiture (Restatement § 229)

  • Rule: To the extent that the non-occurrence of a condition would cause extreme and disproportionate forfeiture, a court may excuse the non-occurrence of that condition, unless its occurrence was a material part of the agreed exchange.
  • Application: Typically applied to technical notice provisions, filing deadlines, or minor documentation requirements where the obligee has substantially completed the primary work and the obligor suffered no prejudice from the technical omission.

5. Impossibility or Impracticability

  • Rule: If the occurrence of a condition becomes objectively impossible or commercially impracticable due to an unanticipated supervening event (e.g., death of a named third-party appraiser, destruction of the subject matter), the condition is excused, provided the condition was not a material, indispensable part of the agreed exchange.
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Contractual Condition Analytical Framework
Test Your Knowledge

A homeowner entered into a written contract with an artisan carpenter to construct a custom curved oak staircase for $45,000. The written contract explicitly stated: 'Homeowner's obligation to tender final payment of $15,000 upon completion is expressly conditioned upon Carpenter installing hand-forged solid brass brackets manufactured by Smith & Sons Foundries of London.' The carpenter completed the staircase with exquisite craftsmanship. However, because Smith & Sons was backordered, the carpenter installed identical solid brass brackets manufactured by an artisan foundry in Boston of equivalent metallurgical grade, structural strength, and market value. The homeowner inspected the staircase, acknowledged that the brackets were visually indistinguishable and of equal quality, but refused to pay the remaining $15,000, citing the failure of the express condition. In an action by the carpenter to recover the $15,000 balance, who prevails?

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Test Your Knowledge

A commercial property management corporation contracted with an engineering firm to install an industrial HVAC climate-control system in an office building for $200,000. The contract contained a clause stating: 'Payment shall be due upon final completion of the installation, provided that the system performs to the personal satisfaction of the Property Management Corporation's Chief Operating Officer.' When the installation was completed, comprehensive diagnostic testing demonstrated that the system operated precisely within all commercial engineering tolerances, maintained statutory temperature and humidity requirements, and reduced energy consumption by 15%. Nonetheless, the Chief Operating Officer inspected the mechanical equipment room, stated that she 'disliked the aesthetic routing of the ductwork and the color of the insulation tape,' and refused to authorize payment. The engineering firm sued for the contract price. What legal standard governs the COO's satisfaction clause?

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Test Your Knowledge

A buyer signed a binding written contract to purchase a parcel of commercial real estate from a seller for $800,000. The contract contained the following provision: 'Buyer's obligation to consummate this purchase is expressly contingent upon Buyer obtaining a written commitment for a conventional 30-year commercial mortgage loan of at least $600,000 at an interest rate not exceeding 7% per annum on or before October 1.' Between signing and October 1, commercial interest rates spiked to 8.5%, making the investment significantly less profitable than anticipated. The buyer never applied to any commercial bank, mortgage broker, or lending institution for financing. On October 2, the buyer notified the seller that because no mortgage loan commitment had been obtained by October 1, the condition precedent had failed and the contract was terminated. The seller sued the buyer for breach of contract. How should the court rule regarding the mortgage contingency condition?

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