Whether the builder’s claimed unilateral mistake about which specifications the signed contract incorporated prevented contract formation.
Holding
No. The written agreement was an enforceable contract, and the builder’s claimed unilateral misunderstanding did not excuse its performance.
Reasoning
The contract unambiguously identified the governing plans and specifications by their titles, dates, and number of pages. It required the builder to construct the house “strictly” in accordance with those documents and sharply limited any substitutions or deviations. Those detailed terms were inconsistent with the builder’s claim that the contract instead incorporated its own earlier, more general three-page proposal.
Even accepting that the Eurice officers honestly believed the agreement referred to their own specifications, that belief was at most a unilateral mistake. The Rays intended the February 14 specifications to govern, and the executed writing objectively expressed that same intent. There was no fraud, duress, or mutual mistake that could justify avoiding the agreement.
Contract formation turns on outward manifestations of assent, not a signer’s undisclosed understanding. A party with capacity who reads and signs a written agreement—or signs without reading it—is ordinarily bound by its terms. The Eurice officers read the contract, were experienced builders, and signed it; the corporation therefore could not rely on a private misconception to disavow its written promise.
Because the agreement was integrated and unambiguous, the builder could not use oral testimony about its supposed intent to vary the contract’s terms. The objective meaning a reasonable person would assign to the signed document controlled, rather than the builder’s subjective interpretation of what it believed it was accepting.