Whether trade usage that painting subcontracts ordinarily cover an entire construction project could resolve the ambiguity and bind Flower to Gumina’s interpretation.
Holding
No. A party is not bound by a trade usage unless it knew or had reason to know of that usage, and Flower had neither.
Reasoning
The written subcontract plausibly supported both sides. The unit-by-unit pricing in Schedule A suggested that Flower had agreed to paint only apartment interiors. But Schedule A’s reference to the “project,” together with the incorporation of plans and specifications describing exterior painting, supported Gumina’s view that Flower had agreed to paint the entire project.
Trade usage may be proved through parol evidence and can help supply meaning to an ambiguous agreement. But the governing limitation is that a party cannot be bound by a usage unless it actually knows, or has reason to know, of its existence and character.
Flower’s president testified that Flower did not know of the asserted Rochester custom of awarding painting subcontracts on an entire-project basis. The court also held that Flower lacked reason to know it: Flower was a new minority-owned contractor, had obtained this first substantial subcontract through an affirmative-action program, and could not realistically be treated as an experienced participant in local construction-trade practices.