16 Pa. Stat. § 5311
Plans and specifications for any county or joint county hospital or building, wing or unit at a general hospital shall be prepared by the board or boards of commissioners or at their instance, or by the general hospital with which an agreement has been made, as the case may be, which plans and specifications must be submitted to the Secretary of Health of the Commonwealth. The cost of the preparation of such plans shall be paid by the county or counties so joining. Upon the approval of said plans and specifications by the Secretary of Health of the Commonwealth, any county or joint county contagious disease hospital may be constructed and equipped in the same manner that any other county buildings are constructed and equipped, and in the case of a building, wing or unit at a general hospital, the same shall be constructed and equipped by the authorities in charge of the general hospital, as may be provided in the agreement with the county or counties joining. But in either event, the expense and cost of such erection, construction and equipment and the cost of the site, if any, shall be paid by the board or boards of commissioners out of county funds.
16 P.S. § 5311