Raleigh, NC Landscaping Rules: Rainwater Harvesting (2026)

UDO § 1.5.4, "Setback Encroachments," lists rainwater collection or harvesting systems alongside solar panels, wind turbines and residential mechanical equipment as features that "may extend into a required rear or side setback, provided that such extension is at least 3 feet from the vertical plane of any lot line." That 3-foot buffer is measured to the actual lot line, not to a fence or hedge, and the allowance only applies to the rear and side yards, a primary-street or side-street setback still has to be kept clear under the general rule that "all buildings and structures must be located at or behind required setbacks." A separate provision in § 1.5.7, "Height Encroachments," lets a rooftop-mounted rainwater collection or harvesting system exceed the applicable zoning district's maximum building height by up to 12 feet, grouped with chimneys, flagpoles, parapet walls and solar panels, but that height bonus does not apply inside an Airport Overlay District (-AOD).

No separate rainwater-harvesting permit or variance is created by these sections; a homeowner installing a ground-level barrel or an elevated cistern that fits inside the 3-foot lot-line clearance and, if roof-mounted, the 12-foot height allowance, does not need a setback variance from the Board of Adjustment. Larger or non-conforming installations still have to meet the underlying district's rear/side setback and height limits set in Chapter 2's building-type tables (e.g., § 2.2.1 for a Detached House).