Bolthole Index

St. Joseph County, Michigan

Building permits, zoning and land rules in Three Rivers, Michigan

Three Rivers, Michigan requires a building-permit application before home construction under statewide law, and the city processes building permits through its contracted SAFEbuilt office.12 Three Rivers sets its own zoning; in St. Joseph County, onsite septic and well permits come from the Branch-Hillsdale-St. Joseph Community Health Agency rather than the city building counter.345

At a glance

Building permits
Apply before home construction; City of Three Rivers / SAFEbuilt processes building permits12
Zoning
City zoning applies; use the parcel’s mapped district36
Septic
District health agency approval required for onsite sewage facilities47
Private wells
District health agency permit required for installation5
Owner-builder
Own-use and own-occupancy licensing exemption; building permits and zoning still apply8
Lot size and setbacks
Single-family residential districts use the city’s Schedule of Regulations; ask SAFEbuilt for the parcel’s dimensions9102

Who to call

Planning & zoning

City of Three Rivers Clerk’s Office — site-plan filing

Site-plan applications and questions about site-plan review exemptions

(269) 273-1075, ext. 108

[email protected]

333 W. Michigan Ave. (49093)

Septic permits

Branch-Hillsdale-St. Joseph Community Health Agency — Environmental Health, St. Joseph County

Onsite septic and well permitting, inspections and records

269-273-2161 ext. 233

[email protected]

1110 Hill Street Three Rivers, MI 49093

Building permits

City of Three Rivers — Building & Zoning

City building and trade permit application routes

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

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

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Do you need a building permit in Three Rivers, MI?

A new home in Three Rivers requires a written building-permit application to the appropriate enforcing agency before construction under Michigan law.1 Three Rivers processes building permits and plumbing and mechanical trade permits through the city.11 Michigan also requires a building permit when a structure’s use or occupancy changes, while ordinary repairs have a limited exemption with structural, utility and safety exceptions.12 An owner building a home for personal use and occupancy on the owner’s property may qualify for Michigan’s residential-builder licensing exemption, but that exemption does not remove building-permit, inspection or zoning requirements.8

Who handles Three Rivers building permits and zoning questions?

SAFEbuilt is Three Rivers’ contracted provider for building permits, inspections and the offices of Building Official and Zoning Administrator.2 Contact SAFEbuilt for the building-permit application, applicable code edition, project fees and inspection scheduling.2 Building department forms are available at the front desk at City Hall and through the city’s document portal.2 Formal site-plan applications go to the Clerk’s Office at City Hall, rather than SAFEbuilt unless the city instructs otherwise.13 Septic and well applications follow a separate route through the district health agency’s Environmental Health office and online portal.14

Does Three Rivers have zoning, lot-size rules and setbacks?

Three Rivers has city zoning that governs development and land use within city limits, with regulations tied to the mapped district.36 In the single-family residential districts, lot-size, setback and building-height requirements refer to the city’s Schedule of Regulations unless otherwise specified.91015 Ask the City Zoning Administrator at SAFEbuilt for the district and dimensional requirements for your exact parcel before choosing a house footprint.2 Dividing land also requires a signed Land Division Application, and every division must meet city zoning, frontage and other ordinance requirements.16

How do septic permits and private wells work in Three Rivers?

The Branch-Hillsdale-St. Joseph Community Health Agency has onsite sewage and water-supply jurisdiction throughout St. Joseph County, including properties inside Three Rivers.4 Where a new building needs an onsite sewage facility, health approval precedes the construction permit; construction affecting an existing system also requires coordination with the Health Officer.17 Private well installation requires a district health agency permit.5 The agency offers online well and septic applications and access to available system and inspection records.14 Michigan plumbing rules require connection to a public sewer where available, or an approved private sewage system otherwise; ask the city to confirm sewer availability and connection requirements for the parcel.18

Can you live in an RV or tiny home in Three Rivers?

We could not confirm permission to occupy an RV or tiny home on private land in Three Rivers; ask the City Zoning Administrator at SAFEbuilt about your proposed dwelling and parcel before relying on either arrangement.2 The city’s Airport District allows camping only as a special-exception use subject to review and approval, which does not establish permission for residential RV occupancy elsewhere.19 We could not confirm a city minimum dwelling size or an accessory-dwelling rule; request the applicable city provisions from SAFEbuilt.2 Any proposed off-grid sanitation must still direct sanitary sewage to a municipal sewer or an approved onsite septic system under Michigan’s sanitation framework.20

What are the steps before building a home in Three Rivers?

  • Confirm the city zoning district and proposed use with SAFEbuilt, including lot size and setbacks before finalizing the house layout.39102
  • Ask whether formal site-plan review applies: qualifying single- or two-family homes on separate lots under separate individual ownership are listed as exempt; projects requiring review obtain zoning approval before filing through the Clerk’s Office.2113
  • Resolve sewer service or obtain required onsite sewage approval from district health before the construction permit where the Environmental Health Code requires it.1817
  • Submit the building-permit application before construction, arrange required construction inspections, and obtain the Certificate of Occupancy before using a new or altered building.12223

What should you check before buying land in Three Rivers?

Ask SAFEbuilt about local driveway and floodplain approvals for the proposed site; we could not confirm the city’s specific requirements.2 Michigan separately regulates development in qualifying river, stream and drain floodplains, and prohibits new residential construction in the floodway.24 A driveway constructed or reconstructed in state highway right-of-way requires MDOT approval under the state’s access rules.25 For a lot needing septic, St. Joseph County’s soil data rates only 3.1% of soils “not limited” for conventional drain fields; that countywide rating calls for a site evaluation and does not mean septic is impossible on your lot.26 For land outside city limits, use the St. Joseph County guide; parcel-level land-use decisions remain with the applicable city, village or township.27

Watch-outs

  • Site-plan review exemptions do not remove the separate building-permit requirement for home construction in Three Rivers.211
  • Three Rivers rental dwellings must be registered annually and are subject to the city’s stated biannual inspections; ask Building & Zoning to confirm the schedule for a rental purchase.28
  • We could not confirm residential RV occupancy, tiny-home occupancy or accessory-dwelling permission in Three Rivers; obtain a parcel-specific answer from SAFEbuilt before buying for that purpose.2

Sources

  1. Stille-DeRossett-Hale Single State Construction Code Act, MCL 125.1510 (Michigan statewide rule), quoted and re-checked
  2. City of Three Rivers Building Official and Zoning Administrator (SAFEbuilt) (threeriversmi.org)
  3. Building & Zoning – City of Three Rivers Michigan (Three Rivers), quoted and re-checked
  4. Water Wells and Water Testing, quoted and re-checked
  5. Water Wells and Water Testing, quoted and re-checked
  6. Zoning Map & Ordinance – City of Three Rivers Michigan (Three Rivers), quoted and re-checked
  7. Well and Septic Applications and Fees, quoted and re-checked
  8. Frequently Asked Questions – Residential Builder (Michigan statewide rule), quoted and re-checked
  9. Code of Ordinances, § 30-22 R-1 and R-2 Single Family Residential District (Three Rivers), quoted and re-checked
  10. Code of Ordinances, § 30-22 R-1 and R-2 Single Family Residential District (Three Rivers), quoted and re-checked
  11. City of Three Rivers — Building & Zoning (threeriversmi.org)
  12. Building Permit Information (Michigan statewide rule), quoted and re-checked
  13. City of Three Rivers Clerk’s Office — site-plan filing (threeriversmi.org)
  14. Branch-Hillsdale-St. Joseph Community Health Agency — Environmental Health, St. Joseph County (bhsj.org)
  15. Code of Ordinances, § 30-22 R-1 and R-2 Single Family Residential District (Three Rivers), quoted and re-checked
  16. Building & Zoning – City of Three Rivers Michigan (Three Rivers), quoted and re-checked
  17. Environmental Health Code, quoted and re-checked
  18. Michigan Part 7 Plumbing Code Rules (Michigan statewide rule), quoted and re-checked
  19. Code of Ordinances, § 30-32B A Airport District (Three Rivers), quoted and re-checked
  20. Disposal of residential wastewater such as swimming pool water (Michigan statewide rule), quoted and re-checked
  21. Site Plan Applications and Review Process – City of Three Rivers Michigan (Three Rivers), quoted and re-checked
  22. courts.michigan.gov (Michigan statewide rule), quoted and re-checked
  23. Certificate of Occupancy Request (Michigan statewide rule), quoted and re-checked
  24. Floodplains (Michigan statewide rule), quoted and re-checked
  25. Infrastructure permits (Michigan statewide rule), quoted and re-checked
  26. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  27. St. Joseph County Master Plan – Update 2007, quoted and re-checked
  28. Building & Zoning – City of Three Rivers Michigan (Three Rivers), quoted and re-checked

Written October 11, 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 Three Rivers

Three Rivers’s own rules

  • Building code adoptedAdopted (with conditions)

    Construction inside Three Rivers city limits.

    • The city page identifies the adopted code as State Building Code, MRC 2009.
    “The State Building Code, MRC 2009, is the adopted Building Code for the City of Three Rivers.”
  • InspectionsRequired

    Registered rental dwellings inside Three Rivers city limits.

    • Rental dwellings must be registered annually; the stated inspection frequency is biannual.

    inspection frequency: biannually (Applies to rental dwellings.)

    “Please note that all rental dwellings must be registered annually and are inspected biannually.”
  • Local zoningPresent (with conditions)

    Land inside Three Rivers city limits.

    • Land use is governed by City Code Chapter 30 and the applicable mapped zoning district.
    “Chapter 30 of the City Code, The Zoning Ordinance, is designed to protect the public health, safety, and general welfare of the community and its people by establishing minimum regulations governing development and use.”
  • Zoning districtsPublished (with conditions)

    All land inside Three Rivers city limits.

    • The City states that the 14 mapped districts have specific regulations; parcel-specific applicability depends on the zoning map.

    zoning districts: 14 districts

    “Collectively, these zones (as shown below) comprise a total of 14 Zoning Districts with specific zoning and zoning-related regulations established for each;”
  • Subdividing landRegulated (with conditions)

    Land divisions inside Three Rivers city limits.

    • The property owner must complete and sign a Land Division Application.
    • All land divisions must meet zoning, frontage, and other City Code and ordinance requirements.
    “All land divisions must meet zoning, frontage and other requirements set forth in the city code and subsequent ordinances.”
  • Permit processPublished (with conditions)

    Projects inside Three Rivers city limits requiring City site-plan review.

    • Zoning approval must precede a Site Plan Application.
    • Site-plan applications must be filed through the Clerk's Office.
    • The cited page identifies exemptions, including single- or two-family homes under separate ownership on separate lots.
    “Before any building permit can be issued, you (or your representative) will need to submit a site plan and before you submit a Site Plan Application, you must obtain zoning approval.”

Rules another office applies inside Three Rivers

Three Rivers does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.

  • Minimum lot sizeDistrict specific (with conditions)

    R-1 and R-2 Single Family Residential Districts inside Three Rivers city limits.

    • Requirements are in the Schedule of Regulations in § 30-20 unless otherwise specified; the applicable numeric entry depends on district and was not reproduced in the opened excerpt.
    “All buildings and uses within the R-1 and R-2 District shall be subject to the requirements of the Schedule of Regulations in Section 30-20 of this Chapter unless otherwise specified.”
  • SetbacksDistrict specific (with conditions)

    R-1 and R-2 Single Family Residential Districts inside Three Rivers city limits.

    • Requirements are in the Schedule of Regulations in § 30-20 unless otherwise specified; the applicable numeric entry depends on district and was not reproduced in the opened excerpt.
    “All buildings and uses within the R-1 and R-2 District shall be subject to the requirements of the Schedule of Regulations in Section 30-20 of this Chapter unless otherwise specified.”
  • Building heightDistrict specific (with conditions)

    R-1 and R-2 Single Family Residential Districts inside Three Rivers city limits.

    • Requirements are in the Schedule of Regulations in § 30-20 unless otherwise specified; the applicable numeric entry depends on district and was not reproduced in the opened excerpt.
    “All buildings and uses within the R-1 and R-2 District shall be subject to the requirements of the Schedule of Regulations in Section 30-20 of this Chapter unless otherwise specified.”
  • Camping on your landLimited

    Camping in the A Airport District inside Three Rivers city limits.

    • Camping is a special-exception use subject to review and approval under § 30-34.
    “The following special exception uses may be allowed in the A District subject to review and approval in accordance with Section 30-34 of this Chapter. (a) Permitted camping”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Three Rivers or St. Joseph County directly.

  • Building permit — Residential construction inside Three Rivers city limits.
  • Owner-builder exemption — Owner-built residential construction inside Three Rivers city limits.
  • Certificate of occupancy — New or altered residential occupancy inside Three Rivers city limits.
  • Minimum dwelling size — R-1 and R-2 Single Family Residential Districts inside Three Rivers city limits.
  • Living in an RV — Residential occupancy of recreational vehicles on private land inside Three Rivers city limits.
12 more unanswered
  • Tiny 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 Three Rivers publishes no rule on the point, not that none exists. St. Joseph County’s page lists the county offices to call.

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