Building permits, zoning and septic rules in Sullivan, Missouri

At a glance

Building permits

Required for construction, alterations and occupancy changes, with listed exemptions¹

Residential building code

City adoption of the International Residential Code⁵

Zoning and land use

City land-use permit and plat-approval process; ask for parcel-specific requirements³

Septic approval

City individual sewage-disposal regulations; confirm the approving authority before installation⁴⁶

Floodplain development

City code includes a required floodplain-development permit⁷

RV and tiny-home living

We could not confirm permission; ask city Building & Code about the proposed use and occupancy²

Who to call

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Do you need a building permit in Sullivan, MO?

Sullivan’s building-permit guidance covers constructing, enlarging, altering, repairing, moving or demolishing a building, changing occupancy, and work on electrical, gas, mechanical or plumbing systems.¹ Sullivan has adopted an International Residential Code for residential construction inside city limits.⁵

The city lists an exemption for one-story accessory buildings less than 200 square feet; ask Building & Code whether your proposed structure fits that exemption before ordering materials.¹ Do not substitute Franklin County’s agricultural-structure exemption for a city determination: the county exemption concerns unincorporated Franklin County, rather than Sullivan city limits.⁸

Who handles building permits in Sullivan, and what should you submit?

Sullivan’s Building & Code Department serves new construction, remodeling, repairs, additions and demolition inside city limits, and the department is on the ground floor of City Hall.² Use the city department for a home project inside Sullivan, rather than the county building counter whose construction role covers unincorporated Franklin County.²⁹

Sullivan says most building-permit applications require scaled drawings, potentially including a site plan, footing and foundation plan, floor plan with electrical information, and a wall section.¹ For a commercial project, the city also identifies Sullivan Fire Protection District building permits and business occupancy permits; ask about both city and fire-district review.²

What does Sullivan zoning mean for RVs, tiny homes and setbacks?

Sullivan publishes a city land-use permit and plat-approval process, separate from the county’s zoning administration for unincorporated Franklin County.³¹⁰ Ask city Building & Code for the parcel’s zoning district, the approval route for the intended residential use, and the dimensional requirements before settling on a building footprint.²³

We could not confirm Sullivan’s specific RV-occupancy, tiny-home, accessory-dwelling, minimum-lot-size or setback requirements; take the proposed use to city Building & Code for a parcel-specific answer.² Sullivan’s building-permit guidance includes changes of occupancy, so ask how occupancy approval applies to a conversion or proposed small dwelling as well as how the land use is approved.¹³

How do septic permits and sewer questions work inside Sullivan?

Sullivan’s city code includes individual sewage-disposal regulations and a permit-process section, but we could not confirm the complete city approval procedure or its exceptions.⁴ Start with Sullivan Water & Sewer to ask whether sewer service is available and which office must approve an individual sewage-disposal system at the address.¹¹⁴

Missouri requires a construction permit before installing or repairing most onsite wastewater systems, with exemptions for some single-family lots; work should wait until the responsible agency issues a permit or confirms an exemption.⁶ Franklin County’s Building Department administers systems within the county wastewater code’s scope, but confirm the city and county roles for a Sullivan parcel rather than assuming county approval replaces city requirements.¹²⁴

What should you check before building a home in Sullivan?

Begin with city Building & Code: describe the proposed home and ask which building drawings and land-use approvals the project needs.¹³ Next, ask Sullivan Water & Sewer about service at the parcel and the individual sewage-disposal approval route if sewer service is unavailable.¹¹⁴

Check floodplain applicability with the city before choosing the building location: Sullivan’s code includes a required floodplain-development permit.⁷ For driveway construction or modification on MoDOT right-of-way, obtain the separate MoDOT approval.¹³ If the property is outside city limits, use the Franklin County guide for the county’s unincorporated-area building and zoning requirements.⁹¹⁰

Watch-outs

• We could not confirm a Sullivan owner-builder exemption for a home; ask city Building & Code before treating self-built construction as exempt.²
• Sullivan’s city sewage-disposal regulations mean a state septic exemption alone should not be treated as city approval; confirm the applicable local process.⁴⁶

Sources

1. Sullivan Building & Code Department — building-permit guidance (sullivan.mo.us)
2. Sullivan Building & Code Department (sullivan.mo.us)
3. Chapter 400: Unified Land Use Regulations - City of Sullivan, MO (Sullivan), quoted and re-checked
4. Chapter 705: Water and Sewers - City of Sullivan, MO (Sullivan), quoted and re-checked
5. Chapter 500: Adoption of Building Codes - City of Sullivan, MO (Sullivan), quoted and re-checked
6. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
7. City of Sullivan, MO Floodplain Management (Sullivan), quoted and re-checked
8. Amendments to the 2021 Residential One- and Two-Family Dwelling Code, quoted and re-checked
9. Building | Franklin County, MO, quoted and re-checked
10. Planning & Zoning Department, quoted and re-checked
11. Sullivan Water & Sewer Department (sullivan.mo.us)
12. County of Franklin On-Site Wastewater Disposal Code, quoted and re-checked
13. Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.