42 Pa. C.S. § 5525 : Consolidated Statutes — JUDICIARY AND JUDICIAL PROCEDURE — ACTIONS, PROCEEDINGS AND OTHER MATTERS GENERALLY — LIMITATION OF TIME — CIVIL ACTIONS AND PROCEEDINGS — Four year limitation

(a) General rule. Except as provided for in subsection (b), the following actions and proceedings must be commenced within four years:
(1) An action upon a contract, under seal or otherwise, for the sale, construction or furnishing of tangible personal property or fixtures.
(2) Any action subject to 13 Pa.C.S. § 2725 (relating to statute of limitations in contracts for sale).
(3) An action upon an express contract not founded upon an instrument in writing.
(4) An action upon a contract implied in law, except an action subject to another limitation specified in this subchapter.
(5) An action upon a judgment or decree of any court of the United States or of any state.
(6) An action upon any official bond of a public official, officer or employee.
(7) An action upon a negotiable or nonnegotiable bond, note or other similar instrument in writing. Where such an instrument is payable upon demand, the time within which an action on it must be commenced shall be computed from the later of either demand or any payment of principal of or interest on the instrument.
(8) An action upon a contract, obligation or liability founded upon a writing not specified in paragraph (7), under seal or otherwise, except an action subject to another limitation specified in this subchapter.
(b) Special provisions. An action subject to section 8315 (relating to damages in actions for identity theft) must be commenced within four years of the date of the offense or four years from the date of the discovery of the identity theft by the plaintiff.

42 Pa.C.S. § 5525

1976, July 9, P.L. 586, No. 142, § 2, effective 6/27/1978. Amended 1980, Oct. 5, P.L. 693, No. 142, § 501(a), effective in 60 days; 1982, Dec. 20, P.L. 1409, No. 326, art. II, § 201, effective in 60 days; 2002, June 19, P.L. 430, No. 62, § 2, effective in 60 days.