Durham, NC Building Setbacks & Zoning: Structure Height Limits (2026)

Durham's UDO sets residential building height through the Sec. A Dimensional Standards table for the Residential Suburban (RS) districts, which covers RS-20, RS-10, RS-8, and RS-M zoning. All four districts share the same base cap: a principal structure may not exceed 3 stories in visual articulation or 40 feet, whichever governs, as calculated under the measurement rules of Sec. 1. That base number is not absolute. In the Suburban Tier, RS-20, RS-10, and RS-8 lots can trade extra setback for extra height: the code allows one additional story for every 10 feet of additional setback provided, but caps the result at 45 feet no matter how much setback is added.

RS-M projects can go further, up to 5 stories, but only through a minor special use permit issued under Sec. 9, and even then the structure cannot exceed 60 feet. Footnote 2 to the dimensional table warns that the 40-foot base can be pulled down further by other overlays and options that apply on a lot-by-lot basis: the small lot option, the reduced pole width flag lot option, infill development standards (Sec. 8), a neighborhood protection overlay, or a local historic district designation. Because the UDO is administered jointly by Durham City-County Planning, this same RS table and height scheme applies both inside Durham's city limits and in unincorporated Durham County wherever RS zoning is mapped, a builder must check the zoning district on the specific parcel, not just the jurisdiction, to know which height ceiling applies.