Rules adopted by a board of county commissioners pursuant to this division may be enforced within the unincorporated areas of the county and within any municipal corporation where the legislative authority of the municipal corporation has contracted with the board for the enforcement of the county rules within the municipal corporation pursuant to section 307.15 of the Revised Code. The rules shall not conflict with rules adopted by the board of building standards pursuant to section 3781.10 of the Revised Code or by the department of commerce pursuant to Chapter 3703. of the Revised Code. This division does not impair or restrict the power of municipal corporations under Section 3 of Article XVIII, Ohio Constitution, to adopt rules concerning the erection, construction, repair, alteration, and maintenance of buildings and structures or of establishing standards and providing for the licensing of specialty contractors pursuant to section 715.27 of the Revised Code.
A board of county commissioners, pursuant to this division, may require all electrical contractors and heating, ventilating, and air conditioning contractors, other than those who hold a valid and unexpired license issued pursuant to Chapter 4740. of the Revised Code, to successfully complete an examination, test, or demonstration of technical skills, and may impose a fee and additional requirements for a license to engage in their respective occupations within the jurisdiction of the board's rules under this division.
R.C. § 3781.102