Under Pennsylvania law, both parties must agree to the terms laid out in the contract. The law establishes a mandatory registration program for contractors who offer or perform home improvements in Pennsylvania.Request a free consultation now! CHAPTER 14. CONTRACTS. Sec. 1401. Power to make contracts. 1402. In Pennsylvania, the statute of limitations for an oral contract is four years, the same as for written contracts. State law requires all contracts that will require a consumer to pay a fee to be in writing. Employment contracts are legally enforceable in Pennsylvania. (b) Assignment of rights. What is Pennsylvania Contract Law?