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Unless a contract is for the sale of goods, see the Uniform Commercial Code -- Sales, the Act of April 6, 1953, P. L. 3, § 2-209 (2), as amended, 12A P.S. § 2-209 (2), it appears undisputed that the contract can be modified orally although it provides that it can be modified only in writing. E.g., Wagner v. Graziano Construction Co., 390 Pa. 445, 136 A. 2d 82 (1957); 4 Williston on Contracts, § 591 (3d ed. 1961); 6 Corbin on Contracts, § 1295 (1962); Restatement, Contracts, § 407 (1932). Construction contracts typically provide that the builder will not be paid for ...