Mississippi County, Missouri Building Permit Guide

Mississippi County publishes no building code of its own for land outside the cities, but it does make the County Clerk its floodplain administrator: a development permit from the Clerk’s office (573-683-2959) is required before any development of unincorporated land, and the same office issues rural 911 addresses. Building permits inside Charleston, East Prairie and the smaller towns come from each city, and septic systems are permitted through the state health department.

Mississippi County building department: who handles permitting

The courthouse is at 200 N. Main St., Charleston, open weekdays 8:00 a.m. to 4:30 p.m. The County Commission meets there every Thursday at 9:00 a.m.; to get on its agenda, call the County Clerk. The county sits at the meeting of the Ohio and Mississippi Rivers behind Corps of Engineers levees, and its Highway Department maintains 342 miles of county roads and 52 bridges and works with the drainage districts.

The county Assessor reviews the new-construction permits filed with Bertrand, Charleston, East Prairie, Wilson City and Wyatt each month (its page still lists Anniston too), so a city permit also feeds the county’s property records.

City permit fees in Charleston and East Prairie

The county publishes no building permit fee. The two largest cities set theirs by construction cost in their city codes:

In East Prairie a house estimated at $200,000 costs $300 (200 × $1.50). East Prairie issues a certificate of occupancy only after the final inspection, and the city will not connect utilities without it. Charleston needs no permit for ordinary repairs and minor alterations that change no major structural part, or cost $500 or less, nor for a detached shed or one-car garage outside the fire limits costing $200 or less, nor for minor wiring repairs; its permits lapse if work has not started within 6 months or is not finished within 24 months.

Floodplain, 911 address and septic rules on county land

Floodplain development permit: the County Clerk runs the county’s floodplain program, and a development permit is required before any development of unincorporated land. Mississippi County joined the National Flood Insurance Program with flood maps dated January 18, 1989, and Bertrand, Charleston, East Prairie, Wilson City and Wyatt participate; FEMA still lists Anniston as well. Charleston’s city manager reported in November 2025 that FEMA’s preliminary maps would add parts of Charleston to the flood zone. Inside Charleston, new or substantially improved homes in mapped flood zones must have the lowest floor 1 foot above base flood elevation.

Rural 911 addresses: the County Clerk’s office issues them, and a floodplain permit or exemption is needed along with the address.

Septic systems: the state health department’s directory lists its own Onsite Wastewater Treatment program (573-751-6095 ext. 5) as the permitting authority for Mississippi County. The Mississippi County Health Department in Charleston (573-683-2191, ask for Environmental) still describes the steps on its site: an application, a soil morphology evaluation or percolation test, and a design reviewed before the permit. The state suspended its septic application fee on August 28, 2026, until it sets new fees; the county page still lists the old $90 fee.

Starting a project in Mississippi County

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

Mississippi County permit FAQs

Do I need a county permit to build outside city limits in Mississippi County, Missouri?

Yes. The County Clerk requires a development permit before any development of unincorporated land; the county publishes no separate building permit or building code.

Who issues 911 addresses in rural Mississippi County?

The County Clerk’s office at the courthouse in Charleston (573-683-2959), which also requires a floodplain permit or exemption.

How much is a building permit in East Prairie?

$1.50 per $1,000 of estimated cost for residential work and $2.25 per $1,000 for commercial work, with a $15 minimum.

Which building code does Charleston use?

The 2012 International Building and Residential Codes and related 2012 codes, with the 2011 National Electrical Code.

Who issues septic permits in Mississippi County?

The state health department’s onsite wastewater program, which suspended its application fee from August 28, 2026.

Mississippi County permit search and official resources

• Mississippi County Clerk (floodplain permits and 911 addresses)
• Mississippi County Commission
• Mississippi County Assessor
• Mississippi County Health Department on-site sewage page
• Missouri DHSS septic (OWTS) permit authority by county
• SEMA emergency and floodplain contacts, Mississippi County
• FEMA Community Status Book: Missouri
• City of Charleston code of ordinances
• City of Charleston
• City of East Prairie code of ordinances
• City of East Prairie
• Missouri DNR order PDWB-2026-234 (City of Anniston dissolution and trustee)

Simplify Mississippi 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 Mississippi County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.