It is mandatory that a contractor register with the City before beginning any work. The Contractor Registration Form can be printed from of our website and brought to the counter for registration or faxed along with a valid government issued photo ID, the current trades license and a completed credit card authorization for the appropriate fee if required. (Incomplete submittals will not be processed.) Contractor Registration Form and Contractor Validation Form the fax number is 972-412-6228 and/or the Development Services Building is located at 5702 Rowlett Road, Rowlett, TX 75088.