Bolthole Index

Douglas County, Missouri

Building permits, zoning and septic rules in Ava, Missouri

Ava, Missouri requires a building permit before residential construction begins, and the city has its own zoning regulations.12 Inside Ava, in Douglas County, City Utilities handles utility service approval; permanent service requires the necessary permits and licenses.3 For a property using septic instead of sewer, Missouri DHSS lists Douglas County under its onsite wastewater program; confirm the requirements for the Ava address before work begins.45

At a glance

Residential building permit
Required before construction begins1
Zoning
City zoning applies inside Ava city limits2
Residential codes
2021 residential code series and 2020 National Electric Code6
Building height
In A and the listed residential districts, principal buildings: 35 feet; accessory buildings: 15 feet, subject to exceptions7
Permanent utility service
Approved application and copies of necessary permits and licenses required3
Septic construction permit
Most installations and repairs require approval; confirm an exemption before starting5

Who to call

Building permits

City of Ava Building Department

Residential building applications; ask the Building Official about zoning and parcel-specific requirements

417-250-7003

Also useful

City of Ava City Utilities

Utility account applications and permanent service approval

417-683-4122

P.O. Box 967 404 S Jefferson St Ava, MO 65608

Septic permits

Missouri DHSS Onsite Wastewater Treatment Program

State onsite wastewater contact for Douglas County; confirm requirements for the Ava address

(573) 751-6095 ext. 5

[email protected]

930 Wildwood Dr. Jefferson City, MO 65102

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 11, 2026.

Off-grid gear

Going off-grid in Ava means bringing your own water and power. The kit we’d start with:

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Does Ava have zoning, and what does it mean for RVs and tiny homes?

Ava has city zoning with district-specific regulations, so a parcel inside city limits needs a city zoning answer rather than an unincorporated-county answer.2 In the A district and the R-1, R-M, R-2 and R-3 residential districts, the listed maximum height is 35 feet for principal buildings and 15 feet for accessory buildings, subject to the stated district and code exceptions.7

Before buying, ask the Ava Building Official to identify the parcel’s district and confirm permitted uses, lot size and setbacks. We could not confirm Ava-specific permission for living in an RV, occupying a tiny home or adding an accessory dwelling; ask about the exact proposed use, including temporary occupancy while building.8

Do you need a building permit in Ava, and who issues it?

Residential construction inside Ava requires a city building permit, and construction cannot begin until the permit is issued and the fees are paid.1 Ava’s residential handout lists the 2021 residential, plumbing, mechanical, fire, fuel gas, energy conservation, and swimming pool and spa codes, plus the 2020 National Electric Code.6

Contact the City of Ava Building Department at 417-250-7003 and submit the relevant project form to the Building Official for review.8 The residential application needs property, contractor, construction, lot-size, setback and plan information; after departmental review, the application goes to City Utilities for payment and pickup.9 Ask the Building Official about owner-performed house construction; we could not confirm a city owner-builder exemption.8

How do septic permits work inside Ava?

Start with City Utilities to establish the water and sewer service plan for an Ava property; permanent utility service requires an approved application and copies of the necessary permits and licenses.3 If the property will use an onsite wastewater system, Missouri DHSS lists Douglas County as DHSS-administered, but confirm the proposed Ava system and address with the Onsite Wastewater Treatment Program.410

Most onsite wastewater installations and repairs require a construction permit, and work should wait until the responsible authority issues a permit or confirms an exemption.5 Missouri’s residential baseline requires a permit on property under 3 acres, but local requirements can affect the exemption.11 State-program application fees for onsite sewage construction, modification and repair were temporarily suspended effective August 28, 2026; confirm the current fee when applying.12

What are the steps to build a home in Ava?

  1. Ask the Ava Building Official to confirm the parcel’s zoning district and the proposed residential use before preparing plans.28
  2. Establish the utility plan with City Utilities; for an onsite wastewater proposal, ask DHSS which approval or exemption applies before installation.35
  3. Submit the residential building application with property, contractor, construction, lot-size, setback and plan information.9
  4. Allow the city’s departmental review, then pay and collect the building permit through City Utilities before construction begins. Additional floodplain-development permits, excavation permits or zoning approval may be needed for the project.9
  5. Apply for the utility account in person with a valid drivers license and a copy of the deed or lease; permanent service also requires the necessary permits and licenses.133

What should you check before buying land in Ava or Douglas County?

For land outside Ava city limits, use the Douglas County guide: the county’s unincorporated-area residential building-permit answer differs from Ava’s city building-permit requirement.141 For an Ava parcel, ask the Building Official to confirm the zoning district and ask City Utilities about service availability before committing to a design.283

If onsite wastewater is proposed, Douglas County’s soil figures are context rather than a parcel approval: 15.1% of county soils are rated not limited for conventional septic drain fields, so a site evaluation still matters and a more specialized system may be needed.15 A driveway constructed or modified in MoDOT right-of-way requires a MoDOT permit.16 Ava’s residential process also identifies possible floodplain-development and excavation permits; ask the city which approvals the proposed site needs.9

Watch-outs

  • We could not confirm Ava-specific RV, tiny-home or accessory-dwelling occupancy permission; ask the Building Official before planning to live on the parcel.8
  • An approved utility application alone does not authorize permanent service in Ava: necessary permits and licenses must also be obtained and supplied.3
  • Missouri allows owners to install, modify or repair their own onsite sewage system subject to state requirements; that rule does not establish an exemption from Ava building permits.171

Sources

  1. Building Department (Ava), quoted and re-checked
  2. Zoning Map (Ava), quoted and re-checked
  3. City Utilities (Ava), quoted and re-checked
  4. OWTS Construction Permit Process, quoted and re-checked
  5. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  6. Residential Handout Part 1 (Ava), quoted and re-checked
  7. Sec. 110-85. Density requirements in A districts (Ava), quoted and re-checked
  8. City of Ava Building Department (avamissouri.org)
  9. Residential Handout Part 1 (Ava), quoted and re-checked
  10. Missouri DHSS Onsite Wastewater Treatment Program (health.mo.gov)
  11. health.mo.gov, quoted and re-checked
  12. OWTS Construction Permit Process (Missouri statewide rule), quoted and re-checked
  13. City of Ava City Utilities (avamissouri.org)
  14. Missouri Open Data Portal (data.mo.gov) - County Building Codes for Missouri (2026 county census)
  15. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  16. Permits | Missouri Department of Transportation (Missouri statewide rule), quoted and re-checked
  17. RSMo Section 701.055 — Property owners may install, modify or clean their own on-site sewage disposal system, quoted and re-checked

Written October 11, 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.

Answers from the rulebook for Ava

Ava’s own rules

  • Building permitRequired

    Residential building construction inside Ava city limits.

    • Permit fees must be paid before the permit is valid and construction can begin.
    • Additional floodplain, excavation, and zoning approvals may be required depending on project scope.
    “Construction is not allowed to begin until a building permit is issued.”
  • Building code adoptedAdopted

    Residential construction inside Ava city limits.

    • The residential handout lists the 2021 International Residential, Plumbing, Mechanical, Fire, Fuel Gas, Energy Conservation, and Swimming Pool and Spa Codes, plus the 2020 National Electric Code.
    • Sec. 18-52 adopts the International Residential Code by reference.

    residential code edition: 2021 · national electric code edition: 2020

    “The City of Ava has adopted the following codes applicable to residential construction”
  • Local zoningPresent

    Land inside Ava city limits.

    • The City of Ava publishes a zoning map and its code contains district-specific zoning regulations.
    “Residential density requirements are as follows:”
  • Building heightDistrict specific (with conditions)

    A, R-1, R-M, R-2, and R-3 districts inside Ava city limits.

    • A district principal buildings are limited to 35 feet and accessory buildings to 15 feet, except required farm structures and flight-zone federal restrictions.
    • The residential density table lists 35 feet for principal buildings and 15 feet for accessory buildings in R-1/R-M, R-2, and R-3.
    • Section 110-228 and other district restrictions may apply.

    principal building maximum height: <= 35 feet (Section 110-228 and district restrictions) · accessory building maximum height: <= 15 feet (Required farm structures and flight-zone federal regulations)

    “The maximum height of a principal building shall not exceed 35 feet, except as provided in section 110-228 . For accessory buildings the maximum height shall not exceed 15 feet, except that required farm structures shall have no height limitations unless located in an existing, or proposed, flight zone, in which case existing federal regulations shall apply.”
  • Mandatory utility hookupConditional

    New residential utility service inside Ava city limits.

    • City utilities serve residents and commercial businesses within city limits and provide water and sewer services.
    • Permanent service requires approval of the utility application and copies of all necessary permits and licenses.
    • The reviewed sources do not state a distance threshold requiring connection when a main is available.
    “City utilities will not supply permanent service until: The customer's application for service has been approved by city utilities. All necessary permits and licenses have been obtained and a copy provided.”
  • Permit processPartial

    Residential building permit applications inside Ava city limits.

    • Applicant submits the application with project, property, contractor, construction, lot-size, setback, and plan information.
    • The application is routed to necessary departments for comments and signatures, then taken to City Utilities for payment and pickup.
    • Permit fees must be paid before construction can begin.
    • Additional floodplain, excavation, and zoning approvals may be required.
    “After your application has been accepted for review it will be routed to the necessary departments for their comments and signatures. The application will then be taken to City Utilities for payment and pick-up.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Ava or Douglas County directly.

  • Owner-builder exemption — Owner-builder construction inside Ava city limits.
  • Minimum dwelling size — Residential dwellings inside Ava city limits.
  • Lot coverage — Lot coverage inside Ava city limits.
  • Tiny homes — Tiny-home occupancy inside Ava city limits.
  • Manufactured homes — Manufactured-home occupancy inside Ava city limits.
9 more unanswered
  • Accessory dwellings
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Agricultural exemption
  • Driveway access
  • Short-term rentals

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Ava publishes no rule on the point, not that none exists. Douglas County’s page lists the county offices to call.

← All of Douglas County: county rules, score and offices