(1) All planning, inspection and designing of plumbing systems and all plumbing and the inspection thereof shall be performed only by persons licensed or registered pursuant to the provisions of this chapter hereinafter called "licensed plumbers" and "registered plumber's apprentices", provided that no person who holds a license or certificate of registration under the Illinois Architecture Practice Act of 1989, or the Structural Engineering Practice Act of 1989, or the Professional Engineering Practice Act of 1989 shall be prevented from planning and designing plumbing systems.
(2) Nothing herein contained shall prohibit a licensed registered plumbing contractor from employing any person at least 16 years of age in plumbing as a plumber's apprentice under the supervision of a licensed registered plumbing contractor. No person shall engage in plumbing as a plumber's apprentice unless he has registered with the board of plumbing examiners as a plumber's apprentice upon forms prescribed by the board. No licensed registered plumbing contractor shall employ any person as a plumber's apprentice who is not so registered.
(3) Nothing herein contained shall prohibit the owner, occupant or lessee of a single-family residence, or the owner of a single-family residence under construction for his or her occupancy, from planning, installing, altering or repairing the plumbing system of such residence; provided, that such plumbing shall comply with all plumbing laws, rules and regulations applicable thereto and shall be subject to such inspection as may therein be provided; and provided further that any such owner or lessee occupant may not employ any other person than a licensed registered plumbing contractor to assist him or her in such work.
(Added Coun. J. 12-9-92, p. 25465; Amend Coun. J. 2-19-20, p. 14473, Art. VI, § 1)