NJ Plumbing Licensing Law of 1968
(CHAPTER 45:14C-12. a.)
a person shall not work as a Master Plumber or use the title or designation of Master Plumber unless licensed pursuant to the provisions of this amendatory and supplementary act.
(CHAPTER 45:14C.12. b.) a person, firm, partnership, corporation or other legal entity shall not engage in the business of Plumbing Contracting or advertise in any manner as a Plumbing Contractor or use the title or designation of Plumbing Contractor unless authorized to act as a Plumbing Contractor
pursuant to the provisions of this amendatory and supplementary act.
(CHAPTER 45:14C-12.4)
the provisions of this amendatory and supplementary act shall not apply to a single family home owner who performs plumbing work on their primary dwelling as long as they are not using it for rental purposes.