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

Yes. Before constructing a building or structure in Lenawee County, the owner or project representative must apply in writing to the appropriate enforcing agency; a permit is also required when a structure's use or occupancy changes¹. Ordinary repairs are exempt, but structural changes, changes to required exits, and specified plumbing, electrical, mechanical or safety-related work are not ordinary repairs¹. Lenawee County directs building, mechanical, electrical and plumbing questions to the city, township or village where the property sits². The enforcing agency periodically inspects work performed under its building permit⁹. A new or altered building cannot be occupied until the code official issues a Certificate of Occupancy⁷.

There is no single permit contact identified for every Lenawee County parcel. The county tells applicants to contact their municipality for building, mechanical, electrical, plumbing, driveway and zoning questions². The appropriate building enforcing agency may be the state, county or local government, depending on jurisdiction¹. If you do not know which municipality contains the parcel, the county directs you to the Lenawee County Equalization Department². The department can be reached at 517-264-4522 or at 301 N Main St, Old Courthouse 1st Floor, Adrian, MI 49221³. Ask the identified enforcing agency for its application, inspection sequence and building-permit fee before finalizing plans; the county environmental-health fee schedule covers well and septic services, not every local building fee¹⁰. Michigan's owner-builder licensing exemption applies when an individual builds on their own property for their own use and occupancy, but it does not waive permits, inspections, codes or zoning⁵.

Lenawee County does not administer zoning; the county states that zoning is determined and maintained by the municipality in question³. That means zoning approval, setbacks and use rules come from the city, village or township that contains the parcel, and the rules and dimensional schedules may differ from one municipality to the next³. Michigan law lets counties, townships, cities and villages establish zoning districts, but that statewide framework does not identify the districts adopted for a particular parcel¹¹. We could not confirm a single answer for setbacks, minimum lot size, minimum dwelling size, lot coverage or building height. Before buying, ask the relevant municipal zoning office for the parcel's zoning district, permitted uses, dimensional standards and any approval required for the proposed home or accessory buildings.

The Lenawee County Health Department has jurisdiction over on-site sewage systems handling up to 10,000 gallons of wastewater per day; EGLE handles large municipal systems, including the system serving the City of Adrian⁴. Obtain the applicable construction permit before installation, then have the system inspected and approved by the department before placing it in service⁴. A building with plumbing must connect to an available public sewer or an approved private sewage-disposal system¹². The county evaluates soil permeability, seasonal high water table, available land area and separation from nearby water supplies during the site evaluation⁴. Only 5.1% of Lenawee County soils are rated without severe limits for a conventional drain field, so do not assume a preferred house site will support a conventional system⁸. The county publishes environmental-health fees for septic services¹⁰. Reach the Sewage Disposal Program at 517-264-5214⁴.

We could not confirm a countywide rule allowing RV occupancy or temporary camping on private land in Lenawee County. Ask the city, township or village where the parcel sits because zoning is set by each municipality rather than the county³. Michigan's campground rules cover sites offered for temporary living quarters for 5 or more recreational units, so they do not answer whether one RV may be occupied on a private parcel¹³. Michigan guidance says a tiny house cannot be treated as a recreational unit merely because it is built on wheels; applicable local zoning, building, electrical and plumbing approvals still apply, along with health-department approval for wells and septic systems where needed¹⁴.

1. Identify the parcel's city, township or village; the Lenawee County Equalization Department can help if you are unsure².
2. Ask that municipality for the zoning district, allowed use, setbacks and required zoning approval because local requirements vary³.
3. Submit the building-permit application to the appropriate enforcing agency before construction¹.
4. Apply to the local health department before drilling a private well⁶.
5. Obtain the appropriate septic construction permit and site evaluation before installation⁴.
6. Schedule building and septic inspections with the agencies that issued the permits^4,9.
7. Complete the work, pay required fees, finalize the permits and request the Certificate of Occupancy before moving in⁷.

Start with jurisdiction: identify the city, township or village and obtain its parcel-specific zoning and building requirements^2,3. Test the proposed septic area early because only 5.1% of Lenawee County soils are rated without severe limits for a conventional drain field⁸. Confirm the approved water source; a private well requires a permit application before drilling⁶. Ask the municipality who controls driveway access for the parcel². A driveway connecting to a state trunkline requires an MDOT permit in addition to the local building permit¹⁵. Check flood status early: new homes are prohibited in a regulated river, stream or drain floodway, and other regulated floodplain work may require EGLE approval¹⁶. Lenawee County's effective property-tax rate is about 1.3%, and the median annual property-tax bill is about $2,412⁸.