Unincorporated Dallas County, Iowa requires a building permit for buildings and structures, and work cannot begin before the permit is issued1. Dallas County also zones its unincorporated area2. Private septic permits go through Dallas County Environmental Health, which requires an approved soil analysis and design before an installation-permit application34.
At a glance
- Building permit
- Required in unincorporated Dallas County5
- Zoning
- Yes, Dallas County regulates its unincorporated area2
- Septic permits
- Dallas County Environmental Health, a separate office from Planning & Development6
- Owner-builder
- No contractor registration needed on your own property, but county permits and codes still apply78
- Manufactured homes
- Must be allowed like a site-built home, on a permanent foundation, same setbacks9
- R-2 lot size
- 12,000 sq ft with common water and sewer; 2 acres without both10
- Septic inspection at sale
- Required statewide before an ownership transfer can be recorded11
- Private wells
- Environmental Health administers county well services12
Who to call
Building permits
Dallas County Planning & Development Department
Building, sub-permit (electrical/mechanical/plumbing), pool and solar permits, entrance-permit coordination, and zoning administration for unincorporated Dallas County
800 Court Street #2200, Adel, IA 50003
Septic permits
Dallas County Environmental Health
Private septic (onsite wastewater) system permits for unincorporated Dallas County
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit 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 & Development13. Iowa does not impose one universal permit requirement on every private building statewide; permit issuance and enforcement follow the applicable local law or ordinance14. 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 compliance78.
Who is the Dallas County building department, and how do you reach them?
Dallas County's Planning & Development department issues building permits for the unincorporated county15. Reach the office at 515-993-5801 or [email protected], at 800 Court Street #2200, Adel, Iowa15. Building permit fees are assessed based on estimated construction cost, with flat fees of $160 for a pool permit and $80 for any sub-permit such as electrical, mechanical, plumbing or solar15. Once a complete application, site plan, construction plans, any required septic and entrance permits, and paid invoice are on file, review takes up to 10 business days, and work cannot begin until the permit is actually issued15. 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 in15.
Does Dallas County have zoning?
Dallas County zoning regulates the physical development of the county's unincorporated area, and the ordinance contains district-specific use and bulk rules216. 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 them10. 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 building1718. Those R-2 figures are not countywide defaults; ask Planning & Development to identify the parcel's district before applying them1615. Iowa county zoning generally does not apply to qualifying agricultural land and farm structures while primarily used for agriculture, except for floodplain-related regulation19.
How do septic permits work in Dallas County?
Dallas County Environmental Health permits private septic systems and enforces state code and county health regulations; call 515-993-5803320. 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 contractor43. A building-permit application also needs a septic permit when the project adds bedrooms or occupancy or connects to an existing septic system415. 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 location21. Before most qualifying transfers of homes served by private septic, Iowa requires a certified inspection and generally requires the tank to be opened and pumped; the inspection remains valid for two years11.
Can you live in an RV or tiny home on land in Dallas County?
Dallas County's reviewed sources do not establish a general answer for RV occupancy, temporary camping, tiny-home occupancy, or minimum dwelling size on private land. Ask Planning & Development how the parcel's zoning district, proposed duration, utilities, and building classification affect the proposed use1516. 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 footage9. Effective in 2026, Iowa also requires a county to allow at least one 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 limits22. Neither statewide rule answers whether an RV may be occupied as a residence on a particular Dallas County parcel922.
What are the steps to build a home in Dallas County, Iowa?
- Confirm the parcel's zoning district and applicable district standards with Planning & Development at 515-993-58011516.
- Have an approved entity complete the soil analysis and septic design, then apply through Environmental Health at 515-993-5803420.
- 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 road2324.
- Submit the building application, scaled site plan, construction plans, septic permit, applicable entrance permit, and required electrical, mechanical, and plumbing sub-permits15.
- Allow up to 10 business days for review after all required items arrive, then pay the invoice before permit issuance15.
- Do not begin work until Dallas County issues the building permit1.
- 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 use15.
What should you check before buying land in Dallas County?
Start with the zoning district, because lot size, setbacks, height, and permitted uses vary by district16. If a tract will be divided, Dallas County regulates subdivision in its unincorporated area25. For a private well, contact Environmental Health, the county's administrative authority for permitting well services12. For septic feasibility, only about 33.2% of county soils lack a severe USDA limitation for a conventional drain field, so obtain the required site-specific soil analysis and design before committing to a house location214. Dallas County's USDA census farmland value is $10,688 per acre, while the typical home value is about $356,3212627. The effective property-tax rate is about 1.5%, and the median annual property-tax bill is about $4,8492829. A new or changed entrance onto a county road needs an approved access permit, although Dallas County charges no permit fee23. Before buying an existing home with private septic, account for Iowa's transfer inspection requirement and the obligation to renovate a failing system11.
Watch-outs
- Iowa requires a private septic system to be inspected, and usually pumped, before an ownership transfer can be recorded — budget for that before you close, not after11.
- The owner-property exemption from Iowa's contractor-registration law does not waive Dallas County's building permit or inspections; confirm the actual permit process with Planning & Development7.
- Confirm your parcel's zoning district with Planning & Development before assuming a manufactured home, RV, or accessory dwelling unit is allowed on it; Iowa's statewide manufactured-home and ADU rules set a floor, not the full local answer922.
Sources
- Building Permit Application Process, quoted and re-checked
- Zoning, quoted and re-checked
- Private Septic Information, quoted and re-checked
- Private Septic Information, quoted and re-checked
- Building Permit Application Process (2026 county census)
- Private Septic Information (2026 county census)
- Iowa Code 2026, Chapter 91C — Construction Contractors (2026 county census)
- Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
- Iowa Code §335.30, Manufactured and modular homes (Iowa statewide rule), quoted and re-checked
- Chapter 45 Zoning Ordinance for the Unincorporated Areas of Dallas County, quoted and re-checked
- Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
- Private Well Information, quoted and re-checked
- Code of Ordinances, quoted and re-checked
- Iowa Code 2026, Chapter 103A — State Building Code (Iowa statewide rule), quoted and re-checked
- Dallas County Planning & Development Department (dallascountyiowa.gov)
- Code of Ordinances, quoted and re-checked
- Chapter 45 Zoning Ordinance for the Unincorporated Areas of Dallas County, quoted and re-checked
- Chapter 45 Zoning Ordinance for the Unincorporated Areas of Dallas County, quoted and re-checked
- Iowa Code 2026, Chapter 335 — County Zoning (Iowa statewide rule), quoted and re-checked
- Dallas County Environmental Health (dallascountyiowa.gov)
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Senate File 2369 — Enrolled (Iowa statewide rule), quoted and re-checked
- Maintenance, quoted and re-checked
- Access Management (Iowa statewide rule), quoted and re-checked
- Subdivision Regulations, quoted and re-checked
- Farmland value per acre (USDA census): Bolthole Index county data
- Typical home value (Zillow): Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 27, 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.