C.R.S. § 9-5-104

(1) The responsibility for enforcement of this article is as follows: (a) For factory-built residential structures as defined in section 24-32-3302 (10), C.R.S., the division of housing created in section 24-32-704 , C.R.S.; (b) In a political subdivision that does not have a local building code, the division of housing created in section 24-32-704 , C.R.S.; (c) For all other housing or in a political subdivision that has adopted a building code, by the building department, or its equivalent, of the political subdivision having jurisdiction.