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

Yes. Before construction of a building or structure in Genesee County, the owner or the owner's representative must apply in writing to the appropriate enforcing agency; a permit is also required for a change in use or occupancy¹. Ordinary repairs are exempt only when they do not involve the structural, egress, public-health or general-safety work identified by the state¹. The Michigan Building Code applies statewide, while residential requirements are contained in the Michigan Residential Code¹⁰. Grand Blanc Township's Building Division approves permits and inspects permitted work within Grand Blanc Township, but buyers elsewhere must identify the state, county or local agency assigned to their parcel^2,11.

The correct building-permit office in Genesee County is the enforcing agency assigned to the parcel, which may be state, county or local; the Michigan Statewide Jurisdiction List identifies the assignment^1,11. For land in Grand Blanc Township, contact the Grand Blanc Township Building Department at 810-424-2600, visit 5371 South Saginaw Road, or use its online permit portal². Grand Blanc Township inspects the permitted work it approves under the Michigan Building Code². Michigan's owner-builder licensing exemption covers a person erecting a residence on that person's property for personal use and occupancy, but it does not waive the building permit⁵. Grand Blanc Township's building permits and zoning do not cover septic: where sewer is unavailable, septic permits and well permits come from the Genesee County Health Department, whatever the township^4,7.

Grand Blanc Township has multiple zoning districts, each with its own permitted uses and standards for setbacks, density and height³. In Grand Blanc Township, the applicable setbacks depend on the parcel's zoning district, and the plot plan must show front, side and rear setbacks plus wetland and power-line setbacks where present³. We could not confirm whether Genesee County directly administers countywide zoning, so ask the township, city, village or county authority serving the parcel rather than applying Grand Blanc Township's rules elsewhere. Grand Blanc Township Planning & Zoning handles questions within that township¹². Michigan's tiny-house guidance requires local zoning, building, electrical and plumbing permits and final approvals, including for a tiny house on wheels⁶.

Where municipal sewer is unavailable, the Genesee County Health Department regulates onsite sewage through site evaluations, permits and inspections⁴. Vacant land goes through a perc test first and a septic-permit application second; a new residential permit costs $220 and is valid for one year from issuance^4,7. A licensed septic contractor, or the owner working under Environmental Health supervision, must install the system, and the department must inspect the tank and drainfield before backfilling⁴. The Health Department's septic installation certificate must be issued before occupancy, but that certificate approves the septic installation only and is not the building certificate of occupancy⁴. Only about 2% of Genesee County soils are rated without severe limitations for a conventional drain field, making the site evaluation a consequential early check¹³.

A tiny house in Genesee County needs local zoning, building, electrical and plumbing permits and final approvals, even when the house is built on wheels⁶. RV rules are set township by township. In Genesee Township, transient RV occupancy may not exceed 30 continuous days in any 120-day period unless the vehicle is connected to electrical service and approved sanitary facilities, in which case it may not exceed 90 days in a calendar year, and a temporary-use permit from the Zoning Administrator is required⁹. In Grand Blanc Township, RVs in residential districts are usually required to be parked behind or beside the house and must meet the front-yard setback³. We could not confirm a countywide rule for living in an ordinary RV, temporary camping, minimum dwelling size or tiny-home occupancy, so ask the zoning authority for the parcel before buying or moving onto the land. Any residence with sewage-generating fixtures must connect to an approved sewage-disposal system; roof drains, footing drains, stormwater pipes and water-softener discharge cannot connect to the septic system⁴. A new or altered building cannot be occupied until the code official issues a certificate of occupancy⁸.

1. Identify the parcel's building-code enforcing agency from the statewide jurisdiction assignment, then confirm zoning with the authority serving that parcel^1,14.
2. If public sewer is unavailable, complete the county's perc-test process before applying for the septic permit⁴.
3. If the property needs a private residential well, submit the county application and scaled site plan before construction; the permit costs $200 and expires two years after issuance⁷.
4. Call MISS DIG 811 before applicable excavation, then apply to the appropriate enforcing agency for the building permit; an owner-builder exemption from builder licensing does not remove the permit requirement^1,5,7.
5. Complete building and septic inspections, including the septic inspection before the tank and drainfield are backfilled^2,4.
6. Obtain the Health Department's septic installation certificate and the separate building certificate of occupancy before moving in^4,8.

Confirm the parcel's jurisdiction first because building-code enforcement and zoning standards depend on the assigned state, county or local authority^11,14. Check sewer availability and soils before treating a conventional septic system as feasible: only about 2% of Genesee County soils are rated without severe limits for a conventional drain field^4,13. If the parcel will use a private well, budget for the $200 residential permit, a scaled site plan, a satisfactory bacteria test and a completed pump record before the water supply enters service⁷. For Grand Blanc Township property, address requests and driveway permits go through the Genesee County Road Commission permit system, but the source does not establish the same requirement for every road frontage in the county².