Ariz. Rev. Stat. § 32-1121
A. This chapter does not apply to:
7. Architects or engineers who are engaging in their professional practice as defined in chapter 1 of this title and who hire or offer to hire the services of a contractor for preconstruction activities relating to investigation and discovery, including:
(c) Drilling for any of the following:
14. Any person other than a licensed contractor engaging in any work or operation on one undertaking or project by one or more contracts, for which the aggregate contract price, including labor, materials and all other items, but excluding any electrical fixture or appliance that was designed by the manufacturer, that is unaltered, unchanged or unmodified by any person, that can be plugged into a common household electrical outlet using a two-pronged or three-pronged electrical connector or that has internal batteries that do not exceed twelve volts in a single, series or parallel configuration and that does not use any other form of energy, including natural gas, propane or other petroleum or gaseous fuel, to operate or is attached by a nail, screw or other fastening device to the frame or foundation of any residential structure, is less than $1,000. The work or operations that are exempt under this paragraph shall be of a casual or minor nature. This exemption does not apply:
D. The exemptions from licensure pursuant to subsection A, paragraphs 4, 9 and 14 of this section do not apply to either of the following:
(L19, Ch. 140, sec. 1)