Milford, NH Zoning Regulations & Building Permits
What we have on file vs. what to verify locally
We don't have editor-verified zoning prose for Milfordyet. Here's the structured data we do have, and the highest-leverage steps to confirm specifics for your parcel.
What we have on file
- Population:
- 15,990
- County:
- Hillsborough County
- State building code:
- NH State Building Code (based on 2018 IBC)(statewide default)
- State ADU law:
- Yes — 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.
- FEMA flood map:
- Search flood zones
- Planning department:
- Milford Community Development
Verify these locally
- Call the Milford Community Development: (603) 249-0620
- Check FEMA flood zone for your parcel — flood-zone status changes setbacks, foundation requirements, and insurance.
- Check your HOA CC&Rs and recorded deed restrictions — they are common in Milford and frequently restrict ADUs, fences, and exterior changes beyond what zoning allows.
Key Zoning Facts
Milford Zoning Overview
Milford is a town in Hillsborough County, New Hampshire, with a population of approximately 15,990 (2020 Census). Located in southern New Hampshire along the Souhegan River, Milford manages land use and development through its zoning ordinance, administered by Milford Community Development.
Milford's zoning ordinance divides the town into several districts, including two residential zones, an integrated business zone, a commercial zone, and an industrial zone. The R district requires 40,000 sq ft minimum lots, while R-A requires a 1-acre minimum.
Key Zoning Districts
Milford's primary residential zoning districts include:
- R (Residence) — Minimum 40,000 sq ft lots with 35 ft front, 20 ft side, and 25 ft rear setbacks. Maximum height of 35 ft.
- R-A (Residence A) — Minimum 1 acre lots. A low-density residential district with larger lot requirements.
Other districts include:
- B (Integrated Business) — Mixed-use business district allowing commercial and compatible residential uses
- C (Commercial) — General commercial district for retail, office, and service uses
- I (Industrial) — Manufacturing, warehousing, and related industrial uses
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. Milford must comply 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 Milford Community Development for the town's specific ADU application requirements and any local dimensional standards
Building Code
Milford 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 Milford generally requires obtaining the appropriate permits from the town'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 Milford Zoning Board of Adjustment (ZBA).
Key Considerations
Before starting any development project in Milford, 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
- Contact Milford Community Development at (603) 249-0620 for pre-application guidance
Disclaimer: This guide provides general information about zoning in Milford, NH and should not be relied upon as legal advice. Zoning codes are subject to change. Always verify current regulations with Milford Community Development before making development decisions.
Regulatory Layers That Apply in Milford
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
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.
Statewide Context (New Hampshire)
Local data for Milford is limited. The following state-level facts apply across New Hampshire and are inherited by this page until city-specific details are verified.
- State Building Code
- NH State Building Code (based on 2018 IBC)
- State ADU Preemption
- Yes — state law overrides local rules
- Coastal Zone
- Yes
- Wildfire Zones
- No
ADU Rules in Milford
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 Milford Community Development.
Permit Costs & Timelines
Permit Costs & Timelines
Specific permit fee schedules for Milford are available from the local planning department. Fees vary based on project type, scope, and valuation.
Check Milford permit fees →Official Sources
City-specific