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

Clinton County requires a building permit for construction that physically alters or adds to a structure, or for work regulated by county codes or ordinances, in the Building Department's service jurisdictions¹. The City of DeWitt and Bath, DeWitt and Watertown townships are local enforcing agencies for all four construction-code disciplines, so applicants there use the local agency for building, electrical, plumbing and mechanical permits³. Septic permits throughout Clinton County still go through the Mid-Michigan District Health Department⁵. The current Michigan Building Code is the 2021 edition, effective April 9, 2025³. Grand Ledge, mainly in Eaton County but extending into Clinton County, requires a city Zoning & DPS Referral Form before the Eaton County building-permit application for the listed construction and alteration work¹¹.

The Clinton County Building Department is at 100 E. State Street in St. Johns and can be reached at 989-224-5181¹. Applications, plans and supporting documents may be sent by email or mail or delivered in person, and the busy-season review estimate is 10 to 14 business days². Online building permits are limited to roofing, siding, or jobs involving three or more windows or doors². Fees use project valuation and ICC Building Valuation Data; a $15 contractor-registration fee applies when registration is required, and the department provides project estimates⁷. Clinton County Planning & Zoning is in Suite 1300 at the same courthouse and can be reached at 989-224-5180⁴.

Clinton County does not have one zoning ordinance that applies countywide⁶. Clinton County Planning & Zoning says it enforces zoning in Bingham, Duplain, Essex, Greenbush, Lebanon, Olive, Ovid, Riley, Victor and Westphalia townships; it directs zoning questions for Eagle, Watertown, DeWitt, Bath, Dallas and Bengal townships, the cities of DeWitt and St. Johns, and the listed villages to the appropriate municipality⁴. Grand Ledge, a city mainly in Eaton County that reaches into Clinton County, enforces its own zoning ordinance¹². Septic permits in Clinton County remain with the Mid-Michigan District Health Department⁵. Within the county zoning jurisdiction, minimum lot area, setbacks and lot coverage vary by district and use⁹. Single-family dwellings must also meet form-specific size and width standards there¹⁰. Residential detached accessory structures in the county zoning jurisdiction cannot exceed a 16-foot sidewall height; that limit does not establish the height allowed for a house or other building type⁹.

The Mid-Michigan District Health Department issues permits for new private sewage-disposal systems in Clinton County from its Clinton Branch office in St. Johns^5,8. The listed new sewage-disposal permit fee is $240, and a vacant-land evaluation is required; incomplete applications are returned and can delay processing, while commercial fees may differ⁸. Michigan requires a building with plumbing to connect to public sewer where available or to an approved private sewage-disposal system¹³. Only about 1.2% of Clinton County soils rate as lacking severe limitations for a conventional drain field, so make the health department's site evaluation an early purchase contingency rather than assuming a standard system will work^5,14.

In the Clinton County zoning jurisdiction, using a trailer, motor home, mobile home or similar temporary structure as a dwelling is prohibited unless the zoning ordinance otherwise permits it⁹. A self-contained movable dwelling may be permitted after a permanent home is destroyed or made uninhabitable, subject to principal-structure setbacks, health-department water and toilet requirements, and a zoning or land-use application showing its location and utilities⁹. We could not confirm a general temporary-camping rule or a separate tiny-home occupancy rule; ask Clinton County Planning & Zoning for county-zoned land⁴. A tiny house on wheels is not automatically a recreational unit under Michigan rules, and applicable zoning, construction and health approvals still apply¹⁵. Outside the ten county-zoned townships, ask the parcel's township, city or village because local zoning varies⁴.

1. Identify the zoning authority and construction-code agency separately: zoning varies by municipality, while the county issues building, electrical, plumbing and mechanical permits except where a local enforcing agency does so^3,4.
2. Confirm the zoning district's lot area, setbacks, coverage and dwelling standards before finalizing plans^9,10.
3. Obtain the vacant-land evaluation and septic permit from the Mid-Michigan District Health Department, regardless of which office handles building permits or zoning^5,8.
4. Submit the building-permit application, plans and supporting documents to the correct enforcing agency².
5. An owner-builder may act as general contractor for a primary single-family residence, but building permits and code compliance still apply⁷.
6. For county-issued building and trade permits, request inspections with 24-hour notice before 4 p.m. on the preceding business day and wait for the posted approval sticker before continuing work; work that is not ready or a locked building triggers a reinspection fee¹⁶.
7. Complete electrical, plumbing and mechanical finals plus health-department septic and water approvals before the final building inspection and Certificate of Occupancy¹⁶.

Confirm the parcel's zoning office and construction-code enforcing agency separately because their service areas differ^3,4. Check the exact zoning district before relying on acreage, setbacks or building coverage; each varies by district or use⁹. Make a satisfactory vacant-land septic evaluation a purchase contingency because only about 1.2% of Clinton County soils rate as lacking severe limitations for a conventional drain field¹⁴. In the county zoning jurisdiction, an agricultural building used for farm equipment or products has conditions: retail, residential and recreational uses are restricted, and roadside loading triggers an added setback⁹. We could not confirm a countywide driveway-permit rule; ask the relevant road authority before closing.