Whether a public-works contractor may rescind a bid after discovering an honest clerical mistake that omitted a material cost item from the bid total.
Holding
Yes. Kastorff was entitled to rescind because the omission of plumbing costs was a material, honest clerical mistake, he promptly gave notice, and enforcing the bid would be inequitable.
Reasoning
Under M. F. Kemper Construction Co. v. City of Los Angeles, an opened public bid is generally an irrevocable option in favor of the public entity. But the bidder may rescind if the requirements for equitable rescission based on mistake are met: the mistake must be material, not caused by neglect of a legal duty, enforcement must be unconscionable, the other party must be capable of being returned to the status quo, and the bidder must promptly give notice of rescission.
Kastorff's worksheets and the uncontradicted testimony of both Kastorff and the district's own architect established the error. The worksheets showed plumbing bids in the preliminary columns but no plumbing amount in the final total column. His final bid therefore contained no allowance at all for plumbing, even though both parties plainly expected the construction work to include it.
The omission was material. Whether the omitted plumbing cost was $6,500 or $9,285, it was a substantial component of an $89,994 bid. The Court noted that the percentage error exceeded the error in Lemoge Electric v. County of San Mateo, where the Court had recognized that the contractor could have rescinded had it chosen to do so.
Kastorff's carelessness did not amount to the neglect of a legal duty that bars rescission under Civil Code section 1577. Clerical mistakes of this kind can occur even in the work of reasonable and cautious businesspeople. The pressure of last-minute subcontractor bidding and Kastorff's failure to detect the omission before submitting did not make the mistake legally inexcusable.
Kastorff acted promptly once he had a practical opportunity to inspect his worksheets. Although he initially assured the board that the figures were correct, he lacked the papers needed to verify the calculation at the bid opening. The next morning, he discovered the omission, notified the architect and superintendent immediately, and repeatedly requested permission to withdraw.
Enforcing the bid would have allowed the district to capitalize on an unintended and inequitable bargain. The district knew of the error before it formally notified Kastorff in writing that his bid had been accepted. Its own bid form required written notice of acceptance before Kastorff had to execute the formal contract, and that notice came about two weeks after his rescission.