Building Setbacks & Zoning in Nashua, NH (2026)

Setback Rules

Nashua Land Use Code Sec. 190-16 (Dimensional Regulations / Dimensional Matrix) sets minimum lot area, frontage, and yard setbacks for each zoning district. Residential districts include R-40 (40,000 sq ft min lot, lowest density), R-30 (30,000 sq ft), R-18 (18,000 sq ft), R-9 (9,000 sq ft), R-A (medium density), R-B (higher density), and R-C (high-density urban). Detached accessory structures (sheds, carports, ADUs) follow Sec. 190-31 / 190-32 with a typical 4 ft side/rear setback. NH RSA 674:72 prohibits Nashua from imposing additional setbacks on ADUs beyond the single-family district standards.