Building permits, zoning and land rules in Davis County, Iowa

Unincorporated Davis County, Iowa does not require a county building permit for a house, garage, barn or shed¹. The full Iowa State Building Code applies locally only when a governmental subdivision accepts it by ordinance, but factory-built-structure rules apply statewide and energy standards apply to Iowa construction with heated or cooled enclosed space⁹. State inspectors handle state-owned or state-financed projects and work where the local jurisdiction has adopted the state code; the available sources do not establish that those inspection conditions apply to an ordinary private Davis County home¹⁰. A local government may issue a certificate of occupancy when an ordinance requires one, but Iowa law does not require one for every home statewide¹¹. A private rural home still needs any applicable septic, floodplain and county-road entrance approvals^2,5,12.

Davis County has no building, codes, or planning-and-zoning department listed on its official website¹. The Davis County Board of Supervisors adopts county ordinances, including the county's subdivision ordinance¹³. ADLM Environmental Public Health handles septic permits¹⁴, while the Davis County Highway Department (County Engineer) handles driveway, entrance and right-of-way permits on county roads¹². Work in county-controlled road right-of-way requires a form, a meeting with the Engineer or representative, county site review and advance notice before work starts¹⁵. Iowa DNR screens state floodplain applications through its PERMT tool⁵. We could not confirm whether Davis County has accepted the state building code, performs inspections or requires occupancy certificates for ordinary private homes; ask the Board of Supervisors whether a current ordinance affects your parcel before building.

Davis County's official website lists no zoning or planning office, and no adopted countywide zoning ordinance for unincorporated Davis County is confirmed; only a subdivision ordinance governing how land is divided is confirmed^1,13. If county zoning applies, land, farmhouses, barns, outbuildings and other structures primarily adapted for agriculture fall outside county zoning while used for agriculture; the county cannot require an application, approval or fee for that exemption⁸. County zoning may still cover agricultural construction or excavation in a river or stream floodplain⁸. Setbacks, lot coverage, building height, minimum lot size and minimum dwelling size remain unconfirmed, so ask the Board of Supervisors about the parcel. Incorporated towns set their own rules; the City of Bloomfield, for example, publishes its own zoning regulations, which do not apply to unincorporated land^1,16. Where county zoning applies, a manufactured home cannot be rejected solely because it is manufactured, but must meet the same permanent-foundation, setback and minimum-size standards as a site-built home on that lot⁷.

Septic permits in Davis County go through ADLM Environmental Public Health, which serves Appanoose, Davis, Lucas and Monroe Counties, and a town address does not change that^2,3,14. Anyone who wants a permit to install or repair a private sewage disposal system in Davis County files an application with ADLM¹⁷. A lateral absorption system application must include a Soil Scientist Report, the permit is valid for at most 12 months, and ADLM must hear at least one work day before completion so it can schedule the final inspection¹⁷. The installation permit fee for a bonded contractor is $300, and the inspection fee is $150³. Local health authorities have primary responsibility for private systems serving four homes or fewer or fewer than 15 people, while Iowa DNR has primary responsibility for larger public systems². A private system cannot be installed, repaired or rehabilitated where public sewer is available or local law requires connection, and the administrative authority makes the final availability decision¹⁸. Only 0.3% of Davis County soils are free of severe limitations for a conventional drain field, so arrange a site evaluation before fixing the house location or price¹⁹. Iowa also requires a certified inspection before most transfers of property served by a private system²⁰. A new private well needs its own construction permit before drilling, issued by the county health department for small private wells, with a $125 application fee unless the county is authorized to issue the permit^21,22.

We could not find an official Davis County or Iowa rule that specifically addresses living in an RV or a tiny home on rural land here; this is an open question the county's official site does not answer. What is confirmed is narrower: Davis County has no zoning office or ordinance covering unincorporated land that we could locate, so there is no known zoning district that would set RV or tiny-home occupancy rules outside a town¹. Manufactured homes are a separate, better-defined category under Iowa law: a manufactured home cannot be turned down solely for being manufactured, but it must sit on a permanent foundation and meet the same setback and minimum-square-footage standards as a site-built home on the same lot⁷. Iowa also now requires a county to allow at least one accessory dwelling unit, up to 1,000 square feet or half the size of the main home, on a lot with a single-family residence, which may be a path to a small second home if you already have a house there²³. Call the Board of Supervisors before moving an RV, tiny home or mobile home onto vacant Davis County land, and call ADLM before you hook up wastewater, since septic is confirmed and regulated even where RV or tiny-home occupancy itself is not¹⁴.

1. Confirm the parcel is in unincorporated Davis County, not inside a town, because municipal rules differ¹.
2. Ask ADLM whether public sewer is available; if not, start the septic permit and site evaluation before fixing the house location^14,18,19.
3. If the site is near a stream or river, use Iowa DNR's PERMT screening tool before building⁵.
4. Apply to the Davis County Engineer for a new or changed entrance within county right-of-way; the application asks applicants to allow 15 days for processing⁴.
5. Coordinate any other county right-of-way work with the Engineer before starting; the county reviews the site and requires advance notice of the intended start¹⁵.
6. If public utility lines must be installed or realigned in county right-of-way, the utility needs an approved accommodation permit, a location plan and advance notice to the Engineer²⁴.
7. Ask the Board of Supervisors whether Davis County has accepted the state building code or adopted another current building or zoning ordinance; working on your own property exempts you from contractor registration, not from other approvals^6,25.

The nearest city of 100,000 or more is about 84 miles from the county's center, and Davis County has roughly 18.3 people per square mile¹⁹. About 21.6% of the county is wooded and 85.3% of its land has a slope of 15% or less, but parcel-level terrain still determines a workable house, driveway and septic layout¹⁹. Only 0.3% of county soils are free of severe limitations for a conventional septic drain field, so make the septic evaluation a purchase contingency¹⁹. Check flood risk with Iowa DNR for land near a stream⁵. Confirm that legal access exists and that the proposed entrance can meet the County Engineer's site-review criteria⁴. Typical property taxes run about 1.5% of value, with a median annual bill near $2,217, while a typical home insurance premium is about $1,619 a year¹⁹.