Marion County, Missouri Building Permit Guide

Marion County is a zoned county, and building on unincorporated land needs a county building permit from the County Coordinator’s office, 100 S. Main St., Suite 4, Palmyra (573-769-5545). The county application prices the permit at the cost of construction times 0.002, and it is issued only after any septic application has gone to the Marion County Health Department. Hannibal, Palmyra and Monroe City issue permits inside their limits, and on June 15, 2026 the county adopted a temporary 12-month moratorium on data centers.

Marion County building department: who handles permitting

The County Coordinator, whose title is Land Use and Capital Improvements Coordinator, advises the county Planning and Zoning Commission, answers zoning questions and issues building permits for the unincorporated county. The office is open weekdays from 8:00 a.m. to noon and 1:00 to 5:00 p.m. SEMA’s directory lists the same office as the county floodplain administrator. Town populations are Census Bureau Vintage 2025 estimates for the part of each city in Marion County.

County building permit: rules and fee

Under the county Land Use Order (first adopted in 1975 and last revised in February 2020), you take a legal description of the property, a sketch showing where the building will sit and a description of the use to the administrative officer, who checks the Official Land Use District Map. If the use and the lot and yard sizes conform, the officer collects the fee and issues the permit; if not, you can ask the County Commission to change the land use district.

For example, a house costing $250,000 to build carries a county permit fee of $500.

Data centers: on June 15, 2026 the County Commission adopted the Planning and Zoning Commission’s recommendation for a temporary 12-month moratorium on establishing or expanding data centers while the Land Use Order is amended, and on July 13, 2026 it formed a task force to research data-center regulations.

Septic, flood and road rules on county land

Septic systems: the Marion County Health Department (3105 Route W, Hannibal; 573-221-1166) issues onsite wastewater permits under a county ordinance, and the county will not issue a building permit until that application is in.

Floodplains: Marion County takes part in the National Flood Insurance Program, with county maps dated July 20, 2016. Development in a mapped flood zone needs the county’s Floodplain Development Permit; work in a designated floodway needs certification that it will not raise the base flood elevation, and the owner must later provide an engineer’s, architect’s or surveyor’s certificate of the as-built lowest floor. Hannibal, Palmyra and Monroe City take part in the program too.

Roads: the county Highway Department (901 Industrial Dr., Palmyra; 573-769-4660) installs driveway pipes and replaces culverts on county roads.

Palmyra fees: new construction in Palmyra costs 20 cents per square foot of everything under roof, up to $10,000, covering at least five inspections, plus a refundable bond equal to the fee. Roofing, porches, fences, decks, driveways, sheds up to 12 by 12 feet and similar work are flat $50 residential or $100 commercial jobs, and fees double if work starts before the permit. Book inspections between 8:00 a.m. and 3:30 p.m.

Getting a Marion County building permit

Missouri building code

Missouri has no mandatory statewide building code for private construction: a county, fire protection district or municipality may adopt one (usually by reference under RSMo 67.280), and in parts of the state none has. Building codes in Missouri

Marion County permit FAQs

Do I need a building permit in rural Marion County?

Yes. Marion County is zoned and requires a county building permit from the County Coordinator’s office in Palmyra.

How much is a Marion County building permit?

The cost of construction times 0.002. A $250,000 house would pay $500.

How far from the road must I build?

At least 80 feet from the center of the road, according to the county building permit application.

Is there a data-center moratorium in Marion County?

Yes. The County Commission adopted a temporary 12-month moratorium on June 15, 2026, to allow amendments to the Land Use Order.

Who issues permits in Palmyra?

The City Building Inspector at City Hall, 301 S. Main St. (573-708-7590). New construction is 20 cents per square foot, up to $10,000.

Marion County permit search and official resources

• Marion County Coordinator: zoning and building permits
• Marion County Application for Building Permit
• Marion County Floodplain Development Permit application
• Land Use Order for Marion County (revised 2020)
• Marion County Commission agenda and minutes
• Marion County Highway Department
• SEMA emergency management and floodplain contacts: Marion County
• FEMA Community Status Book: Missouri
• City of Palmyra building inspector and permits
• Palmyra building and demolition permit fees
• Palmyra City Code on eCode360
• Monroe City Code of Ordinances (Municode)

Simplify Marion County permitting with Alliance Permitting

Alliance Permitting is a permit documentation and submission company in Missouri. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.

This guide is provided by Alliance Permitting for general information about Marion County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.