Ohio Revised Code Title V. Townships § 505.78

(A)(1) A board of township trustees shall not adopt an existing structures code pursuant to section 505.73 of the Revised Code in any county in which the board of county commissioners has adopted an existing structures code pursuant to section 303.37 of the Revised Code.

(2) If a board of township trustees adopts an existing structures code and the board of county commissioners of the county in which the township is located subsequently adopts an existing structures code, the code the board of township trustees adopts shall be of no force and effect one year after the effective date of the code the board of county commissioners adopts or at an earlier date, as provided by the board of township trustees.

(B)(1) A board of trustees shall not adopt local residential building regulations pursuant to section 505.75 of the Revised Code in any county in which the board of county commissioners has adopted such regulations pursuant to section 303.37 of the Revised Code.

(2) If a board of township trustees adopts local residential building regulations and the board of county commissioners subsequently adopts such regulations, the township regulations shall be of no force and effect one year after the county regulations become effective or at an earlier date as the board of township trustees provides.