Manchester, NH Zoning Regulations & Building Permits
Notable local initiatives in Manchester
Named ordinances, statutes, and reforms specific to Manchester — each linked to an official source you can verify directly.
Manchester Land Use Code - first major rewrite since 2001(2025)
On December 16, 2025 the Manchester Board of Mayor and Aldermen approved a new zoning ordinance (effective March 1, 2026) - the first comprehensive update since 2001. The 11-2-1 vote adopted the Manchester Land Use Code, which consolidates the zoning ordinance, subdivision regulations, and site plan regulations into a single streamlined document aimed at increasing housing supply, walkable mixed-use development, and reduced procedural friction.
Source · manchesternh.govNH RSA 674:72 - Statewide ADU mandate
New Hampshire RSA 674:72 requires every municipality, including Manchester, to allow at least one accessory dwelling unit as a matter of right on any lot containing a single-family dwelling, in every zoning district that permits single-family dwellings, without additional requirements for lot size, setbacks, design review, or frontage beyond what would apply to a single-family dwelling without an ADU. Municipalities may not restrict ADU living space to less than 750 sq ft; the default cap is 950 sq ft.
Source · gc.nh.govNH HB 577 (Chapter 197, 2025) - ADU law update(2025)
HB 577, enacted as Chapter 197 of the 2025 Laws of New Hampshire, further amended RSA 674:71-73 governing accessory dwelling units. The updates clarify conversion rights (including detached garages even where they violate current setbacks or lot coverage), prohibit municipalities from denying separate electrical service or panels, and reinforce that absent local ADU provisions one ADU is deemed a permitted accessory use as of right.
Source · gc.nh.govManchester-Boston Regional Airport (MHT) - FAA Part 150 Noise Compatibility Program
Manchester-Boston Regional Airport (MHT) is operated by the City of Manchester. FAA-approved noise exposure maps for MHT became effective December 3, 2010 under 14 CFR Part 150 (Aviation Safety and Noise Abatement Act of 1979). Residential development near the airport may be affected by noise exposure contours and noise-abatement procedures (e.g., turbojet right-turn departures from runway 17); verify any parcel-level overlay or disclosure requirements with Manchester Planning.
Source · federalregister.govNH State Building Code - RSA 155-A
New Hampshire RSA 155-A adopts a statewide State Building Code based on the International Code Council (ICC) family of codes (IBC, IRC, IECC, IEBC, IMC, IPC, IFGC) and applies uniformly to every municipality, including Manchester. Local jurisdictions generally enforce the State Building Code as adopted at the state level by the State Building Code Review Board, with limited authority for local amendments.
Source · gc.nh.gov
Key Zoning Facts
Manchester Zoning Overview
Manchester is the largest city in New Hampshire, located in Hillsborough County, with a population of approximately 115,644 (2020 Census). As the state's most populous city and a regional economic hub, Manchester manages land use and development through its zoning ordinance, administered by Manchester Planning & Community Development.
Manchester's zoning ordinance divides the city into multiple districts, including three residential zones ranging from single-family (R-1) with 10,000 sq ft minimum lots to multi-family (R-3) with 45 ft height limits. The city also includes Neighborhood Business (B-1), General Business (B-2), Central Business District (CBD), Light Industrial (I-1), and Heavy Industrial (I-2) districts.
Key Zoning Districts
Manchester's primary residential zoning districts include:
- R-1 (Single-Family) — Minimum 10,000 sq ft lots with 25 ft front, 10 ft side, and 20 ft rear setbacks. Maximum height of 35 ft.
- R-2 (Two-Family) — Minimum 8,000 sq ft lots with 20 ft front, 8 ft side, and 15 ft rear setbacks. Maximum height of 35 ft.
- R-3 (Multi-Family) — Multi-family residential district with 20 ft front, 10 ft side, and 20 ft rear setbacks. Maximum height of 45 ft. Lot size varies.
Commercial and industrial districts include:
- B-1 (Neighborhood Business) — Small-scale commercial district serving nearby residential areas
- B-2 (General Business) — Broad range of retail, office, and service uses
- CBD (Central Business) — Mixed-use district in Manchester's downtown core
- I-1 (Light Industrial) — Less intensive manufacturing, assembly, and warehousing
- I-2 (Heavy Industrial) — Intensive manufacturing, processing, and warehousing operations
ADU Regulations (Accessory Dwelling Units)
New Hampshire state law (RSA 674:72-73) requires all municipalities to allow ADUs (Accessory Dwelling Units) as a matter of right on any property with a single-family dwelling. Manchester has adopted local ADU provisions in compliance with this state mandate. Key points:
- One ADU is permitted per single-family lot
- The ADU may be attached to or detached from the primary dwelling (subject to local standards)
- Municipalities cannot prohibit ADUs but may adopt reasonable regulations regarding size, parking, and other dimensional standards
- Contact Manchester Planning & Community Development for the city's specific ADU application requirements and any local dimensional standards
Building Code
Manchester follows the NH State Building Code (RSA 155-A), which is based on the International Building Code (IBC) and International Residential Code (IRC). All construction must comply with the state building code.
Development Process
Development in Manchester generally requires obtaining the appropriate permits from the city's planning and building departments. The process typically involves:
- Zoning Verification — Confirm that your proposed use is permitted in the applicable zoning district
- Site Plan Review — For commercial, multi-family, and certain other projects, submit a site plan to the Planning Board
- Building Permit — Apply for a building permit with construction documents
- Inspections — Schedule required inspections during construction
- Certificate of Occupancy — Obtain final approval before occupying the structure
For projects that do not conform to existing zoning, property owners may need to seek a variance or special exception from the Manchester Zoning Board of Adjustment (ZBA).
Key Considerations
Before starting any development project in Manchester, property owners should:
- Verify the zoning classification of their property
- Review setback, height, and lot coverage requirements for the applicable district
- Check for any overlay districts or special regulations
- Determine if the property is in a flood zone using FEMA's flood map service
- Confirm whether HOA covenants or deed restrictions apply
- Review the Manchester Code of Ordinances for the full zoning text
- Contact Manchester Planning & Community Development at (603) 624-6450 for pre-application guidance
Disclaimer: This guide provides general information about zoning in Manchester, NH and should not be relied upon as legal advice. Zoning codes are subject to change. Always verify current regulations with Manchester Planning & Community Development or the municipal code before making development decisions.
Regulatory Layers That Apply in Manchester
Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.
Federal
- FEMA Flood Zones: Applicable
- View FEMA Flood Map
State — New Hampshire
- Building Code: NH State Building Code (RSA 155-A)
- State ADU Override: Yes (NH RSA 674:72-73 requires municipalities to allow ADUs)
County — Hillsborough County
- Role: Property records, tax assessment
City / Municipal
The city's zoning ordinance, building codes, and local permits form the primary layer of land-use regulation for your property.
Overlay Districts
No overlay districts identified.
Private Restrictions
- HOA / CC&Rs common: Yes
- Check HOA CC&Rs and deed restrictions for additional requirements.
Primary Zoning Districts
- Min Lot
- 10,000 sq ft
- Max Height
- 35 ft
- Front Setback
- 25 ft
- Side Setback
- 10 ft
- Rear Setback
- 20 ft
- Min Lot
- 8,000 sq ft
- Max Height
- 35 ft
- Front Setback
- 20 ft
- Side Setback
- 8 ft
- Rear Setback
- 15 ft
- Min Lot
- Varies
- Max Height
- 45 ft
- Front Setback
- 20 ft
- Side Setback
- 10 ft
- Rear Setback
- 20 ft
- Min Lot
- Varies
- Max Height
- Varies
- Front Setback
- Varies
- Side Setback
- Varies
- Rear Setback
- Varies
- Min Lot
- Varies
- Max Height
- Varies
- Front Setback
- Varies
- Side Setback
- Varies
- Rear Setback
- Varies
- Min Lot
- Varies
- Max Height
- Varies
- Front Setback
- Varies
- Side Setback
- Varies
- Rear Setback
- Varies
- Min Lot
- Varies
- Max Height
- Varies
- Front Setback
- Varies
- Side Setback
- Varies
- Rear Setback
- Varies
- Min Lot
- Varies
- Max Height
- Varies
- Front Setback
- Varies
- Side Setback
- Varies
- Rear Setback
- Varies
ADU Rules in Manchester
State law (statewide context, not city-specific):
New Hampshire RSA 674:71-73 (enacted by SB 146, signed March 2016) requires municipalities that adopt zoning to allow at least one accessory dwelling unit as a matter of right or by conditional use permit/special exception in all zoning districts that permit single-family dwellings. HB 1291 (2024), which would have expanded this to two ADUs by right, passed the House but was killed in the Senate.
For local size, setback, and parking specifics, contact the Manchester Planning & Community Development.
Permit Costs & Timelines
Permit Costs & Timelines
Specific permit fee schedules for Manchester are available from the local planning department. Fees vary based on project type, scope, and valuation.
Check Manchester permit fees →Official Sources
City-specific