Building Setbacks & Zoning in Nashua, NH: What Residents Actually Need to Know

If you live in Nashua or are thinking about moving there, building setbacks & zoning are one of those things you probably won't think about until they affect you directly. Nashua has 3 specific rules on the books covering different aspects of building setbacks & zoning, and some of them might surprise you.

Structure Height Limits

Nashua's zoning ordinance caps building height under § 190-16I, measured per the International Building Code; the exact maximum for each residential district, R-40 through R-C, is set in the Dimensional Matrix at Table 16-3, not one citywide number.

Key details: Governing section: § 190-16I, Table 16-3. Height measured by: IBC Chapter 5 standard. Exempt features: chimneys, spires, antennas, rooftop equipment. Industrial height bonus: 120 ft, 8 stories (PI/TOD/HB). Enforcement: Administrative Officer under RSA 676.

The Administrative Officer enforces height compliance before issuing a building permit; violations are prosecuted under RSA 676:11 through 676:19, which authorize stop-work orders, fines, and injunctive relief through the courts.

Setback Rules

Nashua sets separate minimum front, side and rear yard setbacks for each zoning district in the Dimensional Matrix at § 190-16 of the Land Use Code, measured from the property line or, for front yards, the street right-of-way.

Key details: Setback figures live in: Dimensional Matrix, Table 16-3. Front yard measured from: Street right-of-way line. Side/rear measured from: Property line. No conforming setback means: No building permit. Minor encroachments require: ZBA special exception, Table 16-2.

A structure that does not meet its district's setback in Table 16-3 cannot receive a building permit under § 190-16 A(2); the Zoning Board of Adjustment can allow only minor listed encroachments under Table 16-2 as a special exception.

Lot Coverage Limits

Nashua caps lot coverage indirectly: it sets a minimum open-space percentage for each zoning district in the Dimensional Matrix, and no building permit issues unless a project meets that standard.

Key details: Mechanism: Minimum open-space %, not a direct cap. Where set: Table 16-3, Dimensional Matrix, Column N. Enforcement: No building permit without compliance. Governing section: Land Use Code § 190-16(M).

No building permit may be issued for a building or structure that does not conform to the district's open-space (lot-coverage) standard under § 190-16(A)(2).

The Bottom Line

Nashua's building setbacks & zoning rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Nashua is broadly strict or permissive.

This guide is based on Nashua's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.