CONSTRUCTION CODES - 2015 International Code & 2014 National Electrical Code and local amendments. 10 working days notice is required for phase VI / C.O. inspection. An application for a Certificate of Occupancy must be submitted to the Building Inspection Department at least 10 working days prior to Phase VI / C.O. inspection. All contractors on commercial sites must used Allied Waste for all trash removal. Phone number 972-225-4207. For inspection www.rockwall.com/buildinginspections/inpectionreq.asp..