Okla. Stat. tit. 59, § 59-1850.12: Political subdivisions - Inspections - Permits -

Registration.

The provisions of the Mechanical Licensing Act shall not

prohibit any political subdivision from appointing inspectors,

making inspections, requiring permits for mechanical work and

charging such fees as are determined to be necessary by such

political subdivision. Said political subdivision may inspect

mechanical work performed within the jurisdiction of that political

subdivision, and may require contractors to register within their

jurisdiction.