Usually contracts consist of an exchange of promises—a pledge or commitment by each party that somebody will or will not do something. Andy’s promise to cut Anne’s lawn “over the weekend” in return for Anne’s promise to pay twenty-five dollars is a commitment to have the lawn mowed by Sunday night or Monday morning. These promises are known as independent or unconditional, because their performance does not depend on any outside event. Such promises, if contractually binding, create a present duty to perform.

Not all promises to perform under a contract are unconditional; a promise may be subject to a condition as well. A condition is an event the happening or nonhappening of which gives rise to a duty to perform (or discharges a duty to perform). Conditions may be express or implied; they may also be precedent, concurrent, subsequent, or to the satisfaction of a party.

Express Conditions

Express conditions are stated in words in the contract, orally or written. Andy promises to mow Anne’s lawn “provided it doesn’t rain.” “Provided it doesn’t rain” is an express condition. If rain comes, there is no duty to cut the lawn, and Andy’s failure to do so is not a breach of promise. Express conditions are usually introduced by language such as “provided that,” “if,” “when,” “assuming that,” “as soon as,” “after,” and the like. 

Implied Conditions

Implied conditions are unexpressed but understood to be part of the contract. If Mr. Olson guarantees Jack’s used car for ninety days, it is implied that his obligation to fix any defects doesn’t arise until Jack lets him know the car is defective.

Condition Precedent

A condition precedent is a term in a contract (express or implied) that requires performance only in the event something else happens first. Jack will buy a car from Mr. Olson if Jack gets financing. “If Jack gets financing” is a condition precedent.

Condition Concurrent (or Simultaneous)

A concurrent condition arises when the duty to perform the contract is simultaneous: the promise of a landowner to transfer title to the purchaser and the purchaser to tender payment to the seller. The duty of each to perform is conditioned on the performance by the other. As a practical matter, of course, somebody has to make the first move, proffering deed or tendering the check, so simultaneous here means within the same transaction, and not at the exact same moment in time.

Condition Subsequent

A condition that terminates an already existing duty of performance is known as a condition subsequent. Ralph agrees to do preventive plumbing maintenance on an apartment building while the landlord is traveling across country for several weeks. On the landlord’s return, the obligation to provide the maintenance is terminated.

Condition of Timeliness

Typically, if a contract is not performed exactly on time it will not result in a material breach. The promisee has to accept the performance and deduct any losses caused by the delay. But, if the promisee does not want to accept performance that is not on time, the contract can require that “time is of the essence.” This makes time, or timeliness, a condition of the contract. Time as a condition can be made explicit in a clause reciting that time is of the essence. If there is no express clause, the courts will read it in when the purpose of the contract was clearly to provide for performance at or by a certain time, and the promisee will gain little from late performance. But even express clauses are subject to a rule of reason, and if the promisor would suffer greatly by enforcement of the clause (and the promisee would suffer only slightly or not at all from a refusal to invoke it), the courts will generally excuse the untimely performance, as long as it was completed within a reasonable time. A builder’s failure to finish a house by July 1 will not discharge the buyer’s obligation to pay if the house is finished a week or even a month later, although the builder will be liable to the buyer for expenses incurred because of the lateness (storage charges for furniture, costs for housing during the interim, extra travel, and the like).

Condition of Satisfaction of a Third Party

The duty to make a contract payment may be conditioned on the satisfaction of a third party. Building contracts frequently make the purchaser’s duty to pay conditional on the builder’s receipt of an architect’s certificate of compliance with all contractual terms; road construction contracts often require that the work be done “to the satisfaction of the County Engineer.” These conditions can be onerous. The builder has already erected the structure and cannot “return” what he has done. Nevertheless, because the purchaser wants assurance that the building (obviously a major purchase) or road meets his specifications, the courts will hold the contractor to the condition unless it is impossible to provide a certificate (e.g., architect may have died) or the architect has acted in bad faith, or the purchaser has somehow prevented the certificate from issuing. The third party’s refusal to issue a certificate needs to be reasonable.

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