Nothing herein contained shall prohibit any property owner from personally installing plumbing piping or equipment within and upon his or her own residence and intended for his or her personal use and permanent occupancy; provided, the owner shall satisfy the Plumbing Inspector as to his or her ability to install such piping or equipment, secure a permit, pay required fees, do work in accordance with this article, and apply for an inspection and receive approval. Personal installation by an owner under this section shall be by himself, herself, for himself or herself on his or her own residence, without compensation and no person shall be employed to assist him or her in any way on such work except a plumber or plumbing contractor licensed by the city.