According to Greene County Muni Code Section 10-86. - Contractor’s responsibilities:
It shall be the duty of every contractor who shall make contracts for the installation or repairs of building, structure, electrical, gas, mechanical, sprinkler or plumbing systems, for which a permit is required, to comply with state and local rules and regulations concerning licensing which the applicable governing authority may have adopted. In such case that the state requires a contractor to have obtained a state license before they are permitted to perform work, the contractor shall supply the building official with their license number before receiving a permit for work to be performed.
(Code 1998, § 17-109(E); Ordinance of December 9, 1999, § 17-109(E))