Okla. Stat. tit. 63, § 63-1084: Industrial housing - Adoption of Federal standards

Notwithstanding any other provisions of law, or of any municipal

or county ordinance or local building code, the standards for

factory-built housing, housing prototypes, subsystems, materials and

components certified as acceptable by the Federal Department of

Housing and Urban Development are hereby deemed acceptable and

approved for use in housing construction in this state. A

certificate from the State Director of the Federal Housing

Administration of the Department of Housing and Urban Development

shall constitute prima facie evidence that the products or materials

listed therein are acceptable and such certificates shall be

furnished by the building contractor to any local building inspector

or other local housing authority upon request. The provisions of

this act will not preclude on-site inspections by cities and towns

of the service connections for electrical and sanitary facilities.