Bolthole Index

Gallatin County, Montana

Building permits, zoning and septic in Town of Manhattan, Montana

Town of Manhattan, Montana requires a building permit for a building or enclosed structure greater than 200 square feet, with plans approved before construction starts.1 Manhattan has its own zoning ordinance; septic-system installation falls under Gallatin City-County Health Department wastewater permitting.23 RV sleeping on a single-family residential lot is limited to 2 occasions totaling no more than 30 days per calendar year.4

At a glance

Building permits
Required for buildings or enclosed structures greater than 200 square feet; obtain plan approval before starting.1
Zoning
Town zoning applies; use the municipal zoning map to identify the parcel’s district.25
Septic systems
Gallatin City-County Health Department requires a local wastewater permit before installation.63
RV sleeping
Single-family residential lots: 2 occasions totaling at most 30 days annually; a stay over 7 days requires a Town permit.4
Accessory dwellings
Montana municipal zoning law requires an ADU by right on a lot containing a single-family dwelling, subject to applicable standards.7
Owner-builder
State contractor-licensing exemptions are conditional and do not waive building permits or inspections.8
Private well water rights
Qualifying small groundwater uses may receive a permit exception; a Notice of Intent is required before using exempt-well water in 2026.9

Who to call

Building permits

Town of Manhattan Building Official

Town building-permit applications and building-code questions

406-595-9300

[email protected]

Zoning

Town of Manhattan Town Office — Zoning

Town zoning, district identification and zoning-permit questions

406-284-3235

[email protected]

207 South Sixth Street, Manhattan, MT, 59741

Zoning

Town of Manhattan Zoning Administration — Adopted Code

Zoning-permit conditions and expiration provisions

Septic permits

Gallatin City-County Health Department — Environmental Health

Local wastewater-system applications, site evaluation requirements and septic inspections

406.582.3120

[email protected]

400 E. Babcock Street Bozeman, MT 59715

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Town of Manhattan means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Town of Manhattan, MT?

Town of Manhattan requires a building permit before constructing any building or enclosed structure greater than 200 square feet; the permit includes plumbing, electrical and zoning permits.1 Construction must wait for approval from the building inspector and zoning administrator, and administrative, plan-review and inspection charges apply.1 Manhattan’s inspection provision references the rules and procedures of Bozeman’s building-code enforcement division; start with Manhattan’s Building Official for the current inspection arrangements.1011 Ask the Building Official how the permit threshold applies to your particular shed, addition or alteration before ordering materials.111

Who handles building permits and zoning in Town of Manhattan?

The Town of Manhattan lists a Building Official at 406-595-9300 and [email protected], and the Town Office’s zoning contact at 406-284-3235.1112 Use the municipal building/zoning page for the application and zoning map, and ask the Town Office for the current zoning fee schedule.51311 Building permits and zoning approval are separate from local wastewater-system approval: Gallatin City-County Health Department handles the latter.16 For a parcel outside town limits, use the Gallatin County guide for the county’s land-use approval and state building-permit jurisdiction.14

Does Town of Manhattan have zoning, lot sizes and setbacks?

Town of Manhattan has an adopted zoning ordinance and publishes an interactive zoning map; identify the parcel’s district before choosing a house layout.25 Manhattan’s application requires scaled plans, dimensions, setbacks from streets and lot lines, utility connections and parking where required.15 We could not confirm Manhattan’s district-specific minimum lot sizes, dwelling sizes, setbacks, lot coverage or height limits; request the applicable dimensional schedule from the Town Office’s zoning contact.12 The Town Council governs subdivision applications inside Manhattan, and subdivision review supplements zoning, floodplain, building, development and fire requirements rather than replacing them.16

How do septic permits work inside Town of Manhattan?

A septic system proposed inside Town of Manhattan needs a local wastewater treatment system permit before installation under Gallatin County’s countywide requirement.3 Gallatin City-County Health Department requires signed wastewater and property-information forms, fee payment and a scaled site plan.3 Site evaluations must be performed by a registered site evaluator or Montana-registered professional engineer, and a county-registered installer must be on-site during installation.17 Healthy Gallatin currently posts wastewater review timelines of around 40 days.17 We could not confirm when Manhattan requires public sewer connection or whether an individual lot may use septic instead; ask Town zoning and Environmental Health to resolve the sewer-versus-septic question before designing a system.1217

Can you live in an RV or tiny home in Town of Manhattan?

Sleeping or camping in a parked RV on a single-family residential lot in Town of Manhattan is limited to 2 occasions per calendar year, totaling no more than 30 days.4 Any stay exceeding 7 days requires a Town permit; ask Town zoning about the permit before arranging a stay while building.412 We could not confirm a separate Manhattan tiny-home occupancy rule, so ask the Building Official and zoning contact to classify a proposed tiny home before buying one.1112 Montana municipal zoning law requires at least one ADU by right on a lot containing a single-family dwelling, while retaining applicable building, fire and health requirements.7 Attached or detached ADUs may not exceed 75% of the primary dwelling’s gross floor area or 1,000 square feet, whichever is less.7

Building a home in Town of Manhattan: what are the steps?

  1. Identify the parcel’s zoning district using Manhattan’s map, then ask Town zoning to confirm the proposed use and dimensional standards.512
  2. Resolve utility connections with the Town Office; for a proposed septic system, obtain Environmental Health’s site evaluation and wastewater approval before installation.15123
  3. Submit scaled plans showing the lot, construction, setbacks, utilities and required parking to the building and zoning officials.15
  4. Obtain plan approval and pay applicable charges before starting construction; coordinate inspections with the Building Official.11011
  5. Confirm the work schedule: Manhattan’s code also cancels a zoning permit if work is not substantially completed within 1 year of issuance.18

What should you check before buying land in Town of Manhattan?

Ask Manhattan’s Building Official about occupancy approval and any owner-builder requirements; we could not confirm a town-specific certificate-of-occupancy rule or construction-permit exemption.11 Montana’s conditional owner-builder contractor-licensing exemption does not itself waive building permits or inspections.8 Ask Town zoning who administers floodplain development and driveway approvals for the parcel; we could not confirm those town-specific requirements.12 If a private well is proposed, Montana’s groundwater permit exception may cover uses at or below 35 gallons per minute and 10 acre-feet annually, but qualification is not automatic.9 Beginning in 2026, an exempt-well user must file a Notice of Intent with DNRC before using the water; the filing fee is $400.9 We could not confirm whether Manhattan allows a private well instead of public water service; ask the Town Office before relying on the state exception.12

Watch-outs

  • Manhattan’s short RV-stay allowance does not provide a long-term residence option on a single-family residential lot: the annual total is at most 30 days.4
  • Do not rely solely on starting construction to preserve a zoning permit: Manhattan’s code also specifies cancellation when work is not substantially completed within 1 year.18
  • Healthy Gallatin posts wastewater reviews at around 40 days; include wastewater approval in your construction schedule.17
  • We could not confirm Manhattan’s sewer-connection requirement or off-grid sanitation options; ask the Town Office and Environmental Health before committing to a septic design.1217

Sources

  1. 12-1-2: Building Permit Required (Town of Manhattan), quoted and re-checked
  2. 10-1-1: Title (Town of Manhattan), quoted and re-checked
  3. Wastewater (Septic) Treatment - Healthy Gallatin, quoted and re-checked
  4. Manhattan Town Code Reminders (Town of Manhattan), quoted and re-checked
  5. Building / Zoning (Town of Manhattan), quoted and re-checked
  6. Wastewater (Septic) Treatment - Healthy Gallatin, quoted and re-checked
  7. 76-2-345. Accessory dwelling units -- regulations -- restrictions, MCA (Montana statewide rule), quoted and re-checked
  8. Montana Code Annotated, Title 37, Chapter 45, Construction Contractors (Montana statewide rule), quoted and re-checked
  9. Exempt Well Updates and Information (Montana statewide rule), quoted and re-checked
  10. 12-1-2: Building Permit Required (Town of Manhattan), quoted and re-checked
  11. Town of Manhattan Building Official (townofmanhattan.com)
  12. Town of Manhattan Town Office — Zoning (townofmanhattan.com)
  13. 10-2-3: Schedule of Fees (Town of Manhattan), quoted and re-checked
  14. Frequently Asked Questions | Gallatin County, MT, quoted and re-checked
  15. 10-2-2: Zoning Permit (Town of Manhattan), quoted and re-checked
  16. codelibrary.amlegal.com (Town of Manhattan), quoted and re-checked
  17. Gallatin City-County Health Department — Environmental Health (healthygallatin.org)
  18. Town of Manhattan Zoning Administration — Adopted Code (codelibrary.amlegal.com)

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Town of Manhattan

Town of Manhattan’s own rules

  • Building permitRequired

    Construction of any building or enclosed structure greater than 200 square feet inside the Town of Manhattan.

    • The permit includes plumbing, electrical, and zoning permits.
    • Application must be made before construction starts.
    • Construction may not start until plans are approved by the building inspector and zoning administrator.
    • An administrative fee and plan-review and inspection costs are payable under the applicable schedule.

    floor area threshold: > 200 square feet (Buildings or enclosed structures of 200 square feet or less are outside this provision.)

    “For the construction of any building or enclosed structure greater than two hundred square feet (200), the owner [...] must apply [...] for a building permit”
  • InspectionsRequired

    Permitted construction inside the Town of Manhattan.

    • Inspection costs are payable under a schedule provided by the building code inspector.
    • Plans are reviewed and inspections are made under the rules and procedures of the Bozeman city building code enforcement division.
    “Plans shall be reviewed and inspections made in accordance with the rules and procedures of the Bozeman city building code enforcement division.”
  • Local zoningPresent

    Land inside the Town of Manhattan.

    • The ordinance is titled the zoning ordinance of the one-mile jurisdictional area and the Town of Manhattan.
    “This title shall be known and cited as the ZONING ORDINANCE OF THE ONE MILE JURISDICTIONAL AREA AND THE TOWN OF MANHATTAN”
  • Zoning districtsPublished

    Zoning information for land inside the Town of Manhattan.

    • The Town publishes an interactive zoning map and a zoomable zoning map page.
    • The adopted zoning ordinance is published in the Town code.
    “interactive zoning map [...] ZONING MAP (ZOOM OPTION)”
  • Living in an RVLimited

    Camping or sleeping in a parked motor home, camper trailer, camper, or recreational vehicle on a single-family residential lot inside the Town of Manhattan.

    • Allowed on two separate occasions per calendar year.
    • Total duration may not exceed 30 days.
    • A Town permit is required.
    • A permit is required for any stay exceeding seven days.

    occasions per calendar year: 2 occasions · maximum total duration: <= 30 days · permit threshold: > 7 days (A permit is required for any stay in excess of seven days.)

    “A permit will be required for any stay in excess of seven (7) days.”
  • Subdividing landRegulated (with conditions)

    Division of land within Gallatin County located inside the Town of Manhattan.

    • The Town of Manhattan town council is the governing body for applications within town limits.
    • The subdivision title supplements other regulations, including zoning, floodplain, building, development, and fire codes.
    • More restrictive requirements apply where regulations conflict.
    “This title governs the division of land within Gallatin County which is located within the town.”
  • Permit feesPublished (with conditions)

    Town zoning permits, appeals, variances, and related matters inside the Town of Manhattan.

    • The fee schedule is filed in the town council office.
    • Fees may be altered or amended only by the town council.
    • No permit, zone change, or variance may issue until charges and fees are paid in full.
    “The schedule of fees shall be filed in the office of the town council, and may be altered or amended only by the town council.”
  • Permit processPublished (with conditions)

    Building and zoning permit applications inside the Town of Manhattan.

    • Applications identify the lot, construction size and nature, scaled plans, setbacks, utility connections, and parking if required.
    • Plans are submitted in duplicate and reviewed by the building official and zoning administrator.
    • Permits expire after one year unless construction has begun or an extension is granted.
    • Appeals must be presented to the Board of Adjustments within 30 days.

    permit expiration: 1 year (Unless construction has begun, including site improvements, or an extension is granted.) · appeal deadline: 30 days (After filing of the zoning administrator or building official decision.)

    “All permits expire within one year after date of issue unless construction has begun, this includes site improvements, or an extension [...] is granted”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Manhattan or Gallatin County directly.

  • Owner-builder exemption — Owner-builder exemptions for construction inside the Town of Manhattan.
  • Certificate of occupancy — Certificate-of-occupancy requirements for land inside the Town of Manhattan.
  • Minimum dwelling size — Minimum dwelling size inside the Town of Manhattan.
  • Minimum lot size — Minimum lot size inside the Town of Manhattan.
  • Setbacks — Building setbacks inside the Town of Manhattan.
15 more unanswered
  • Lot coverage
  • Building height
  • Tiny homes
  • Manufactured homes
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Building in a floodplain
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Town of Manhattan publishes no rule on the point, not that none exists. Gallatin County’s page lists the county offices to call.

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