Building permits, zoning and land rules in Wayne County, Michigan

Before constructing a building or structure in Wayne County, the owner or representative must submit a written building-permit application to the appropriate enforcing agency; changing a structure's use or occupancy also requires a permit¹. Michigan's statewide construction code applies, including the Michigan Residential Code for one- and two-family dwellings¹. Ordinary repairs can be exempt, but structural, egress, plumbing, electrical, mechanical and safety work can fall outside that exemption; describe the work to the local building department before starting¹. Ask that department for the building-permit fee schedule for the proposed work¹.

Wayne County building permits come from the local city or township building department rather than a single county building counter¹. Confirm the parcel's enforcing agency using Michigan's jurisdiction list, which identifies where county code enforcement applies⁸. Submit a written application and construction documents unless the building official waives the documents because the application description establishes code compliance¹. Septic and well permits remain with Wayne County Environmental Health; contact the office at 33030 Van Born Road, Wayne, MI 48184, or (734) 727-7400^3,4,9.

Wayne County zoning depends on the parcel's city or township; Plymouth's city rules do not establish the rules for unincorporated Wayne County or another municipality². Northville administers its own zoning ordinance and map, while Wayne County Environmental Health remains the septic permitting authority^3,10. Plymouth publishes a zoning map, use matrix and ordinance with district-specific uses, heights and setbacks². Plymouth's single-family residential district limits new homes to 25 feet, and its R-1 district requires at least 60 feet of lot width and 7,200 square feet of lot area^11,12. Plymouth's RM-1 and RM-2 multifamily districts list no minimum unit size, but other district requirements still apply; that is not countywide permission for a tiny home¹². We could not confirm a countywide zoning ordinance; ask the parcel's city or township planning office for its district and applicable standards².

Wayne County permits residential and small-commercial onsite sewage systems where sanitary sewer is unavailable, using a perc test or soil evaluation to set permit specifications³. Submit the application, parcel identification, survey or legal description as applicable, plot plan and fees³. The county's 2024 schedule lists $471 for a septic permit under 1,000 gallons per day; confirm the current fee with Environmental Health¹³. Drainfield excavation must be inspected before sand fill or stone is placed, and completed systems require county approval³. About 11.7% of county soils lack severe limits for conventional drain fields, making the soil evaluation an early feasibility check⁷. Outside Detroit, homes with onsite septic systems require a satisfactory function inspection before sale³.

We could not confirm countywide permission to live in an RV or tiny home on private land in Wayne County; ask the parcel's city or township about the proposed use and duration². Plymouth's rear-yard RV storage rule does not authorize residential occupancy¹¹. Temporary camping events involving at least 5 recreational units require a campground license through the local health department; the ordinary limit is 2 weeks, with written extensions capped at 4 weeks, and municipal zoning approval may also apply¹⁴. Those event rules do not answer whether an individual RV can serve as a home¹⁴. Michigan's resort-style tiny-house guidance requires local zoning, construction and applicable health approvals⁵. Where public sewer is unavailable, Wayne County requires approved onsite sewage treatment connected to every sewage-generating facility³. Ask Environmental Health about composting toilets or other alternatives before choosing a system; we could not confirm their acceptance³.

1. Identify the parcel's city or township, then confirm its zoning approval requirements, zoning district, permitted residential use, setbacks and height rules².

1. Ask the local building department to confirm jurisdiction, required construction documents, trade permits and fees¹.

1. Determine whether municipal sewer is available. The building agency requires proof of a municipal connection or a sewage permit before issuing the building permit³.

1. If public water is unavailable, obtain the required well permit; the published residential fee is $250 for a one- or two-family unit, including an irrigation well^4,13.

1. Submit the building permit application to the local building department before construction¹. An individual building on their own property for their own use and occupancy may qualify for Michigan's owner-builder licensing exemption, but permits and other approvals still apply⁶.

1. Complete the required building and septic inspections, then obtain the required certificate of occupancy before using the new or altered building^3,15,16.

Before buying Wayne County land, confirm the parcel's zoning, sewer availability and water supply with its municipality; Wayne County Environmental Health handles onsite sewage and new well permits^2,3,4. Building agencies require proof of municipal sewer connection or a sewage permit before issuing a building permit³. Wayne County reviews preliminary and final subdivision plans against county standards, and local review may also apply¹⁷. Adding or improving a driveway approach within county road right-of-way, county property or a county drain easement requires a county construction permit; the county publishes application procedures for this work¹⁷. For flood-prone land, Michigan prohibits new residential construction in regulated floodways; ask EGLE and the local building department about the site's floodplain requirements¹⁸.