Building permits, zoning and septic rules in Dallas County, Iowa

Unincorporated Dallas County, Iowa requires a building-permit application for buildings and structures, including pools and ground-mounted solar installations, and construction cannot start until the county issues the permit¹. Dallas County administers locally adopted uniform construction codes through Planning & Development⁸. A person doing work, or having work done, on the person's own property is excluded from contractor status under Iowa's contractor-registration law, but that exclusion does not waive Dallas County permits, inspections, or code compliance⁴.

Dallas County's Planning & Development department issues building permits for the unincorporated county¹. Reach the office at 515-993-5801 or dcplandev@dallascountyiowa.gov, at 800 Court Street #2200, Adel, Iowa¹. The minimum building-permit fee is $80, while electrical, plumbing and mechanical permits are each a flat $80; the Building Official calculates the building fee from project valuation, and card payments add a 3% service fee⁹. Dallas County says review can take up to 10 business days after the required application materials arrive; pay only when Planning & Development directs you, and wait for the issued permit before starting work^1,9. Regular inspections are required before footings are poured, before the foundation is poured, before any under-slab plumbing is covered, when framing and rough-ins are complete, and before occupancy, and inspection requests must be emailed rather than called in¹.

Dallas County divides its unincorporated area into 14 zoning districts with district-specific use and bulk rules⁶. In the R-2 One and Two-Family Residential District, the minimum lot is 12,000 square feet with common water and sewer systems and two acres without them⁶. The same district requires a front yard of 35 feet from a private-road right-of-way or 50 feet from a public-road right-of-way, and its maximum heights are 35 feet for a principal building and 20 feet for an accessory building⁶. Those R-2 figures are not countywide defaults; ask Planning & Development to identify the parcel's district before applying them^1,6. Qualifying agricultural land and farming activity are exempt while used for agriculture, subject to the ordinance's floodplain exception and agricultural-exemption determination process⁶. West Des Moines, a city mostly in Polk County that reaches into Dallas County, sets its own zoning inside city limits¹⁰. Private septic approval for West Des Moines parcels on the Dallas County side stays with Dallas County Environmental Health; a copy of the county permit must be filed with the city's Building Inspection Department^3,11.

Dallas County Environmental Health permits private septic systems and enforces state code and county health regulations; call 515-993-5803^1,3. Dallas County requires an approved entity to complete the soil analysis and system design before an installation-permit application is submitted, and installation or repair must be performed by an approved septic contractor³. A building-permit application also needs a septic permit when the project adds bedrooms or occupancy or connects to an existing septic system^1,3. Alternative septic systems require an approved maintenance-provider contract before permitting and throughout the life of the system³. Only about 33.2% of Dallas County soils lack a severe USDA limitation for a conventional septic drain field, reinforcing the need to evaluate the actual site before fixing a house location¹². Dallas County states that state law has required a septic inspection before transfer of title since July 2009³.

We could not confirm whether unincorporated Dallas County allows RV living, temporary camping, or tiny-home occupancy on private land, or what minimum dwelling size applies; ask Planning & Development about the parcel's district, proposed duration, utilities, and building classification^1,6. Iowa does bar a county from rejecting a residential structure solely because it is a manufactured home, but the home must use a permanent foundation and meet the standards applied to a site-built home on the same lot, including setbacks and minimum square footage⁵. Effective in 2026, Iowa also requires a county to allow an accessory dwelling unit on a lot in a zoning district where a single-family residence is an allowed principal use, subject to applicable building rules and statutory size limits¹³. Neither statewide rule answers whether an RV may be occupied as a residence on a particular Dallas County parcel^5,13.

1. Confirm the parcel's zoning district and applicable district standards with Planning & Development at 515-993-5801^1,6.
2. Have an approved entity complete the soil analysis and septic design, then apply through Environmental Health at 515-993-5803^1,3.
3. Obtain an entrance permit from Secondary Roads before building a new or modified entrance to a county road; use Iowa DOT for an entrance to a state road^14,15.
4. Submit the building application, scaled site plan, construction plans, septic permit, applicable entrance permit, and required electrical, mechanical, and plumbing sub-permits¹.
5. Allow up to 10 business days for review after all required items arrive, then pay the county-calculated fee only when Planning & Development directs you to do so^1,9.
6. Do not begin work until Dallas County issues the building permit¹.
7. Request inspections by email at the required construction stages, including footings, foundation, exposed under-slab plumbing, rough framing and systems, and final inspection before occupancy or use¹.

Start with the zoning district, because lot size, setbacks, height, and permitted uses vary by district⁶. If a tract will be divided, Dallas County regulates subdivision in its unincorporated area¹⁶. For a private well, contact Environmental Health, the county's administrative authority for permitting well services⁷. Dallas County's USDA farmland value is $10,688 per acre, while the typical home value is about $356,321¹². The effective property-tax rate is about 1.5%, and the median annual property-tax bill is about $4,849¹². A new or changed entrance onto a county road needs an approved access permit, although Dallas County charges no permit fee¹⁴. Before buying an existing home with private septic, account for Iowa's transfer inspection requirement and the obligation to renovate a failing system¹⁷.