Naperville, IL Building Setbacks & Zoning: Structure Height Limits (2026)

The Naperville Municipal Code sets building height district by district under Title 6, Chapter 6 (Residence Districts). Section 6-6A-8 caps the R1A low density single-family district, the City's largest residential zone, at two and one-half stories and no more than thirty-five feet. The identical 2½-story, 35-foot cap applies in R1B, R1, R5 (mobile home park), E1, E2, E3 estate districts, and the AG agricultural district, where barns and silos alone may reach fifty feet. Multi-family zones run taller: R3A (Section 6-6D-8) also tops out at thirty-five feet, R2 (Section 6-6C-8) allows forty feet/three stories for multi-family buildings while holding single-family homes and duplexes to the 35-foot cap, R3 (Section 6-6E-8) allows forty-three feet, and R4 (Section 6-6F-8) allows seventy-five feet.

Section 6-2-4 (Building Height and Bulk) supplies the citywide measurement method every district cap relies on: height is measured from a datum point set by averaging the two grades along each side lot line where the front yard line meets it, up to the highest point of a flat roof or parapet, the deck line of a mansard roof, or the mean level between eave and ridge on a gable, hip, or gambrel roof. Chimneys, ornamental towers, scenery lofts, monuments, cupolas, domes, spires, steeples, false mansards and parapet walls, and necessary mechanical appurtenances are exempt and may rise to their customary height regardless of the district cap.

Teardown and infill single-family and duplex projects instead follow separate height rules that supersede the underlying district limit. The Zoning Administrator, housed in the Transportation, Engineering, and Development Business Group, enforces height compliance through building inspections and can stop work that doesn't conform. A property owner who wants to exceed the district height cap must obtain a zoning variance under Section 6-3-9, reviewed by the Planning and Zoning Commission before City Council action.