Nashua, NH Zoning Overlays & Bonuses: Downtown Design Guide (2026)
Key Facts
- First-floor transparency
- 60%-90% of frontage
- Upper-floor transparency
- 10%-50% of facade
- Vertical piers
- every 15-35 feet
- Facade features required
- 4 of 5 listed elements
- Reviewing body
- Planning Board / ZBA
Summary
Nashua's D-1 and D-3 Downtown Districts require storefront transparency, street-oriented entrances and facade articulation on every new building or addition.
Between 60% to 90% of the length, and at least 50% of the surface, of the first floor street frontage shall be in transparent public entrances or windows (including retail display windows). Between 10% to 50% of the surface of the front facade for each floor above the first floor street frontage shall be in transparent windows. At least one public entrance, such as a doorway, shall be accessible from the sidewalk. No windows or openings of storefronts shall utilize a mirrored reflective film. Films allowing light to pass through but blocking ultraviolet light are permitted. The intent is that interior displays will be visible from the right-of-way.
(d) Building frontages that face public streets and exceed a width of 20 feet must include vertical piers or other vertical visual elements to break the plane of the building frontage. Such vertical piers or vertical elements must be spaced at intervals of 15 feet to 35 feet along the entire building frontage. Vertical visual elements may include entryways, windows, columns, colonnades, or other form of modular fenestration.
(e) Doors may be recessed into the face of the building to provide a sense of entry and to add variety to the streetscape. The ground surface of an entryway shall not be less than 15 square feet. Door openings shall not exceed six feet horizontally and 10 feet vertically. Overhead doors for loading docks, delivery and distribution shall be permitted only on the rear of the building.
(f)
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4805762; v29 updated 2026-02-10; through 02-10-2026).
Full Breakdown
Buildings in the D-1 and D-3 Downtown Districts must face the street, skip front parking, and meet strict facade rules: 60% to 90% of first-floor street frontage must be transparent windows or entrances, upper floors need 10% to 50% transparency, and wide frontages need vertical piers every 15 to 35 feet. Facades need four of five listed features, pediment, cornice, upper-story windows, mid-building articulation, or a recessed entry. Mirrored film is banned; light-transmitting UV film is allowed.
Violations & Fines
Site plan or building permit applications that don't meet the standards go to the Planning Board, which can approve an alternative standard and modify dimensional or design requirements, or an applicant can seek a variance from the Zoning Board of Adjustment.
Frequently Asked Questions
Do all downtown Nashua buildings need this much window space?
Can a downtown building skip the design standards?
Sources & Official References
Other rules in Nashua
Compare Nashua to another location·View the New Hampshire zoning overlays & bonuses overview
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