Building permits, zoning and septic rules in Bay County, Michigan

At a glance

Building permit

Required for construction and changes in use or occupancy; apply to the assigned enforcing agency¹

Zoning

Local ordinances vary by city or township³

Septic

Bay County Health Department, Environmental Health Division, issues onsite sewage permits countywide⁴

Owner-builder exemption

Not confirmed on official county or township sources; ask your township's building official directly⁵

Septic soils

Only about 0.8% of the county's soils are rated free of severe limits for a conventional drain field⁶

Certificate of occupancy

Required statewide before a new or altered building can be used⁷

Utility connection

A building with plumbing must connect to public sewer where available, or an approved private septic system⁸

Tiny homes

Treated as a building requiring full local zoning, building, electrical and plumbing approval, not as a recreational unit⁹

Who to call

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

Do you need a building permit in Bay County, Michigan?

Yes. A person constructing a building or structure, or changing its use or occupancy, must submit a written building-permit application to the appropriate enforcing agency in Bay County¹. Ordinary repairs are exempt only when they do not involve the listed structural, egress, plumbing, electrical, mechanical, public-health or safety exceptions¹. Michigan's building code governs construction, alteration, addition, repair, removal, demolition, use, location, occupancy and maintenance, with one- and two-family dwelling provisions in the Michigan Residential Code². A new or altered building cannot be occupied until the code official issues a Certificate of Occupancy after required permits are finaled and fees are paid⁷. We could not confirm an owner-builder exemption for Bay County, so ask the enforcing agency before planning to self-perform regulated work⁵.

Who issues building permits in Bay County, and how do you reach them?

The correct permit counter depends on the enforcing agency assigned to the property; Michigan recognizes state, county and local enforcing agencies². Bangor Township is one confirmed local example: its Building & Zoning Department reviews plans, issues permits and inspects construction for compliance with state building codes and local ordinances¹⁰. The Bangor Township office is at 180 State Park Drive, Bay City, MI 48706, and its phone number is (989) 684-8931¹⁰. A Michigan jurisdiction listing may instead designate a county enforcing agency where a local unit does not provide its own code enforcement¹¹. Identify the city or township for the parcel first, then ask that local government which enforcing agency receives the application; do not assume the Bangor Township office serves land outside Bangor Township¹⁰.

Does Bay County have zoning?

Zoning requirements across Bay County vary by city or township, and the county directs land-division applicants to consult the applicable city or township assessor³. Michigan's zoning framework allows counties, townships, cities and villages to establish zoning districts, but the framework does not supply the actual district rules for a particular parcel¹². Setbacks, permitted uses, minimum dwelling size, lot coverage, building height and accessory-dwelling rules therefore need to be checked with the city or township responsible for the parcel; we could not confirm countywide standards for those questions³. Before buying, identify the municipality, zoning district and proposed use, then obtain the applicable local ordinance answer in writing.

How do septic permits work in Bay County?

Septic is the one function Bay County runs directly: the Health Department's Environmental Health Division conducts site evaluations and issues onsite sewage disposal permits countywide⁴¹³. Statewide, Michigan's EGLE oversees the onsite wastewater program while local health departments handle the actual permitting and inspection, which is exactly the arrangement Bay County uses¹⁴. Every building with plumbing fixtures must connect to a public sewer where one is available, or otherwise to an approved private septic system, and sanitary sewage can't be handled by any other arbitrary off-grid method⁸¹⁵. Soils here make this section especially important: USDA soil survey data rates only about 0.8% of Bay County's soils as free of severe limits for a conventional septic drain field, a real NRCS rating rather than an error, reflecting the county's flat, poorly drained lakeplain soils along Saginaw Bay⁶. Expect a site evaluation to be central to any purchase decision, and budget for the strong likelihood of an engineered or alternative system rather than a standard drain field⁶.

Can you live in an RV or tiny home on your land in Bay County?

We could not confirm a countywide rule allowing RV occupancy or temporary camping on private land in Bay County, and local zoning varies by city or township³. Michigan guidance for tiny houses used as resort cabins says that a tiny house is not a recreational unit even when built on wheels and requires local zoning, building, electrical and plumbing approvals⁹. That guidance does not establish a general right to occupy a tiny house on a private Bay County parcel⁹. Ask the city or township zoning office about residential use, duration limits and placement before buying or moving an RV or tiny home onto the land; Bangor Township's Building & Zoning Department is relevant only for parcels in Bangor Township¹⁰.

Building a home in Bay County: the steps, in order

1. Identify the city or township and ask which building-code enforcing agency serves the parcel².
2. Confirm the local zoning district, setbacks and allowed use with that city or township because local zoning varies across Bay County³.
3. Submit the building-permit application to the assigned enforcing agency before beginning regulated construction¹.
4. Apply for the onsite sewage permit through the Bay County Health Department's Environmental Health Division and arrange the required site evaluation⁴.
5. Confirm the sewer plan because plumbing must connect to public sewer where available or to an approved private sewage-disposal system⁸.
6. If the project divides or develops land, complete the local subdivision review and account for Bay County Drain Commissioner review of stormwater facilities¹⁶.
7. Complete required inspections and obtain the Certificate of Occupancy before moving in⁷.

What to check before you buy land in Bay County

Only about 0.8% of Bay County soils are rated without severe limits for a conventional septic drain field, so make septic feasibility an early purchase contingency⁶. Local zoning varies by city or township, so confirm the parcel's municipality, zoning district and allowed use before relying on a listing description³. A proposed land division or subdivision is regulated under the Michigan Land Division Act and local standards, while the Bay County Drain Commissioner reviews stormwater facilities for flood protection¹⁶. Property taxes have an effective rate around 1.6%, with a median annual bill near $2,205¹⁷¹⁸. Also verify legal access, floodplain constraints and driveway requirements with the responsible local offices because we could not confirm countywide rules for those issues.

Watch-outs

• Building permits are required in Bay County, but the appropriate enforcing agency can be state, county or local, so confirm the assignment for the parcel before applying¹².
• Only about 0.8% of Bay County's soils are rated free of severe limits for a conventional septic drain field, so a site evaluation should happen before you finalize plans on any parcel, not after⁶.
• A land division or subdivision brings separate local standards and may require Bay County Drain Commissioner review of stormwater facilities¹⁶.

Sources

1. Building Permit Information, quoted and re-checked
2. Building Permit Information, quoted and re-checked
3. Property Descriptions and Mapping, quoted and re-checked
4. Bay County Health Department - Environmental Health Division (2026 county census)
5. (2026 county census)
6. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
7. Certificate of Occupancy Request (Michigan statewide rule), quoted and re-checked
8. Michigan Part 7 Plumbing Code Rules (Michigan statewide rule), quoted and re-checked
9. 2022 ARVC - General (Michigan statewide rule), quoted and re-checked
10. Bangor Township Building & Zoning Department (one example township office; contact the specific township for your parcel) (bangortownship.org)
11. Building Permit Information (Michigan statewide rule), quoted and re-checked
12. Michigan Zoning Enabling Act (Michigan statewide rule), quoted and re-checked
13. Bay County Health Department (Environmental Health Division) (baycountymi.gov)
14. Michigan Guide to Environmental Regulations, Chapter 3: Wastewater (Michigan statewide rule), quoted and re-checked
15. Disposal of residential wastewater such as swimming pool water (Michigan statewide rule), quoted and re-checked
16. Land Developments within Bay County, quoted and re-checked
17. Effective property tax rate: Bolthole Index county data
18. Median property tax bill: Bolthole Index county data

Written September 29, 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.