The Build a Residential Accessory Building guide provides step-by-step instructions for residents living in Wake County's unincorporated area. All plans are required to be designed to meet the 2018 North Carolina Residential Code.The provisions of this chapter shall control the design and construction of walls and partitions for buildings. Before the erection, construction or alteration of any building or structure, or part of same, there shall be submitted to the. North Carolina State Building Code. (a). Preparation and Adoption. Construction documents shall show the size, section and relative locations of structural members with floor levels, column centers and offsets dimensioned. Completed elevation certificate from a NC licensed land surveyor - see attached checklist.