Nashua, NH Building Setbacks & Zoning: Setback Rules (2026)

Setbacks for buildings or structures are measured as the area between the furthest projection of a principal structure and the property line of the lot on which the structure is located, except as provided below. Where a yard abuts a street, the setback shall be measured from the abutting street right-of-way line. Commentary: Typically, the side and rear setback is measured from the property line, while the front setback is measured from the right-of-way because the front yard adjoins the street.

(2) Development in setbacks.

(a) Setbacks shall be unobstructed from the ground to the sky except as specified in this section. The following features may encroach into a required building setback: [1] Any buttress, cornice or pier may extend beyond the setback not more than 12 inches. [2] Unenclosed steps not extending above the first floor level may extend up to three feet to a side property line or up to a front property line. [3] Retaining walls, regardless of necessary height, may extend up to 18 inches to a street line or service lane. [4] A protective hood or overhang over a doorway may extend not more than three feet into the required minimum yards. [5] Balconies or bay windows, not to exceed three feet into the required setback. [6] Chimneys, not to exceed two feet. [7] Heating and cooling units, not to exceed three feet. [8] Overhanging roof, eave, gutter, cornice, or other architectural features and awnings, not to exceed two feet. [9]