Douglas County publishes no building code or building permit for unincorporated land. Septic systems there are permitted directly by the Missouri Department of Health and Senior Services (573-751-6095, ext. 5). Inside Ava, the county’s only city, the Ava Building Department (417-250-7003) issues permits under the 2021 International codes and the 2020 National Electrical Code.
Douglas County building department: who handles permitting
The state emergency agency lists the county emergency coordinator at P.O. Box 398, Ava (417-683-3315). It names no county floodplain administrator.
| Place | Who permits building work |
|---|---|
| Ava (3,231) | City of Ava Building Department: the building official reviews applications (417-250-7003; leave your name and number if the official is out on inspections); City Hall, 404 S. Jefferson St., P.O. Box 967 (417-683-5516) |
| Unincorporated county | No county building permit is published; septic permits from the state health department; Douglas County does not appear in FEMA’s flood program list |
Short on time to read all of this?
Get a free quote →Building permits in Ava
Ava rewrote its building chapter in February 2026 (Ordinance 1163). Every building or structure that is built, altered, repaired, removed or demolished needs a permit, except ordinary repairs that cost less than $200 and do not touch structural parts. The city has removed the residential code’s permit exemptions for decks, fences up to 7 feet, sidewalks and driveways, and storm shelters, so those need permits too.
The Building Department posts separate forms for homes, commercial buildings, foundation-only work, excavation, signs, certificates of occupancy and miscellaneous permits. Homes and two-family buildings may use plans you draw yourself; other new buildings and major renovations need plans from a Missouri architect or engineer. Stake the building out on the lot when you apply so the setback can be inspected. The application is routed to the city departments for sign-off, and you pay the permit and utility connection fees when you pick the permit up at the City Utilities building (417-683-4122).
Not sure this scope needs a permit?
Get a free quote →Ava inspections for a house
- Setback, footing and foundation
- Framing with rough electrical, plumbing and mechanical
- Gas test
- In-ground plumbing, electrical and sewer
- Temporary and permanent electric service
- Final, before anyone moves in
Other Ava rules
- A permit expires if work does not start within 6 months
- Give the building official 48 hours’ notice before starting work
- No utilities until the occupancy permit is issued
- Commercial buildings need an inspection and certificate of occupancy every two years
Septic, floodplain and data centers
Septic on county land: the state health department handles onsite sewage permits in Douglas County itself, from Jefferson City. Missouri law (RSMo 701.031) frees a single-family lot of 3 acres or more from those rules only on two conditions: every component lies more than 10 feet from the boundary, and no effluent runs onto another property, into water or creates a nuisance. The state stopped charging its $90 application fee on August 28, 2026, pending new fee rules.
Ava flood zones: Ava takes part in the National Flood Insurance Program with a flood map dated August 4, 1988, and its building department checks every permit site for flood risk. Building on a lot in a flood hazard area needs a conditional use approved by the Zoning and Planning Commission, a lowest-floor elevation set by a Missouri architect or engineer, and that professional’s letter recorded with the Douglas County Recorder.
Rather talk it over?
Call 1-855-478-4290 →Ava data center moratorium: Ordinance 1173, adopted July 1, 2026, imposes a one-year moratorium on accepting, processing or issuing city applications and permits for data centers, cryptocurrency mining, artificial intelligence computing facilities, server farms and similar uses in Ava.
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
Douglas County permit FAQs
Does Douglas County, Missouri require a building permit?
No county building permit is published for unincorporated land. Septic systems still need a state permit in the cases state law covers, and Ava requires its own permits inside the city.
Who issues septic permits in Douglas County?
The Missouri Department of Health and Senior Services, directly (573-751-6095, ext. 5).
Rather not deal with the Douglas County building department?
Get a free quote →Do I need a permit for a deck or fence in Ava?
Yes. Ava deleted the residential code’s exemptions for decks and for fences up to 7 feet, so both need a city permit.
What codes does Ava enforce?
The 2021 International codes, including the residential, plumbing, mechanical, fire and energy codes, and the 2020 National Electrical Code.
Can I build in a flood zone in Ava?
Only with a conditional use approved by the Zoning and Planning Commission and a floor elevation set by a Missouri architect or engineer.
Douglas County permit search and official resources
- Missouri DHSS septic (OWTS) permit authority by county
- SEMA emergency and floodplain contacts, Douglas County
- FEMA Community Status Book: Missouri
- City of Ava Building Department and permit forms
- City of Ava residential construction information packet
- City of Ava code of ordinances
Want this handled start to finish?
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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.
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Read guide →This guide is provided by Alliance Permitting for general information about Douglas County permitting. Requirements, fees, and procedures change; confirm details with the permitting authority before relying on them.