Bolthole Index

Dallas County, Iowa

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

58Index Score / 100
#38 of 99 in Iowa

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 County1
Zoning
Yes, Dallas County regulates its unincorporated area2
Septic permits
Dallas County Environmental Health, including private systems inside city limits3
Owner-builder
No contractor registration needed on your own property, but county permits and codes still apply56
Manufactured homes
Must be allowed like a site-built home, on a permanent foundation, same setbacks7
R-2 lot size
12,000 sq ft with common water and sewer; 2 acres when neither is present8
Septic inspection at sale
Time-of-transfer inspection required under state law9
Private wells
Environmental Health administers county well services10

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

515-993-5801

dcplandev@dallascountyiowa.gov

800 Court Street #2200, Adel, IA 50003

Online permits →

Septic permits

Dallas County Environmental Health

Private septic (onsite wastewater) system permits for unincorporated Dallas County

515-993-5803

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

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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 & Development11. 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 compliance56.

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 county12. Reach the office at 515-993-5801 or dcplandev@dallascountyiowa.gov, at 800 Court Street #2200, Adel, Iowa12. 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 fee13. 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 work1214. 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 in12.

Does Dallas County have zoning?

Dallas County divides its unincorporated area into 14 zoning districts with district-specific use and bulk rules15. 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 them8. 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 building1617. Those R-2 figures are not countywide defaults; ask Planning & Development to identify the parcel's district before applying them1812. Qualifying agricultural land and farming activity are exempt while used for agriculture, subject to the ordinance's floodplain exception and agricultural-exemption determination process15. West Des Moines, a city mostly in Polk County that reaches into Dallas County, sets its own zoning inside city limits19. 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 Department203.

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 515-993-5803321. 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 system412. 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 location22. Dallas County states that state law has required a septic inspection before transfer of title since July 20099.

Can you live in an RV or tiny home on land in Dallas County?

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 classification1218. 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 footage7. 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 limits23. Neither statewide rule answers whether an RV may be occupied as a residence on a particular Dallas County parcel723.

What are the steps to build a home in Dallas County, Iowa?

  1. Confirm the parcel's zoning district and applicable district standards with Planning & Development at 515-993-58011218.
  2. Have an approved entity complete the soil analysis and septic design, then apply through Environmental Health at 515-993-5803421.
  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 road2425.
  4. Submit the building application, scaled site plan, construction plans, septic permit, applicable entrance permit, and required electrical, mechanical, and plumbing sub-permits12.
  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 so1214.
  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 use12.

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 district18. If a tract will be divided, Dallas County regulates subdivision in its unincorporated area26. For a private well, contact Environmental Health, the county's administrative authority for permitting well services10. Dallas County's USDA farmland value is $10,688 per acre, while the typical home value is about $356,3212728. The effective property-tax rate is about 1.5%, and the median annual property-tax bill is about $4,8492930. A new or changed entrance onto a county road needs an approved access permit, although Dallas County charges no permit fee24. Before buying an existing home with private septic, account for Iowa's transfer inspection requirement and the obligation to renovate a failing system31.

Watch-outs

  • Dallas County states that a septic inspection is required before title transfers, so budget for it before closing9.
  • 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 & Development5.
  • 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 answer723.

Sources

  1. Building Permit Application Process, quoted and re-checked
  2. Zoning, quoted and re-checked
  3. Private Septic Information, quoted and re-checked
  4. Private Septic Information, quoted and re-checked
  5. Iowa Code 2026, Chapter 91C — Construction Contractors (2026 county census)
  6. Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
  7. Iowa Code §335.30, Manufactured and modular homes (Iowa statewide rule), quoted and re-checked
  8. Chapter 45 Zoning Ordinance for the Unincorporated Areas of Dallas County, quoted and re-checked
  9. Private Septic Information, quoted and re-checked
  10. Private Well Information, quoted and re-checked
  11. Code of Ordinances, quoted and re-checked
  12. Dallas County Planning & Development Department (dallascountyiowa.gov)
  13. Building Permit Application Process, quoted and re-checked
  14. Building Permit Requirements, Fees, and Inspections, quoted and re-checked
  15. Zoning | Dallas County, IA, quoted and re-checked
  16. Chapter 45 Zoning Ordinance for the Unincorporated Areas of Dallas County, quoted and re-checked
  17. Chapter 45 Zoning Ordinance for the Unincorporated Areas of Dallas County, quoted and re-checked
  18. Code of Ordinances, quoted and re-checked
  19. West Des Moines: Title 9 Zoning (Dallas County), quoted and re-checked
  20. West Des Moines: 7-8D-4: Permit Required (Dallas County), quoted and re-checked
  21. Dallas County Environmental Health (dallascountyiowa.gov)
  22. 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
  23. legis.iowa.gov (Iowa statewide rule), quoted and re-checked
  24. dallascountyiowa.gov, quoted and re-checked
  25. Access Management (Iowa statewide rule), quoted and re-checked
  26. Subdivision Regulations, quoted and re-checked
  27. Farmland value per acre (USDA census): Bolthole Index county data
  28. Typical home value (Zillow): Bolthole Index county data
  29. Effective property tax rate: Bolthole Index county data
  30. Median property tax bill: Bolthole Index county data
  31. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked

Written October 12, 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.

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Compared with neighboring counties

Like 5 of its 6 neighbors, Dallas County has countywide zoning.

RuleDallas CountyBoone CountyGuthrie CountyPolk CountyGreene CountyMadison CountyAdair County
Building permitRequiredLimitedRequiredRequiredLimitedRequiredNot required
County zoningYesYesYesYesYesYesNo
Septic permitsCounty Env. Health Dept.County Health & SanitationCounty Env. HealthCounty Env. Health ServicesCounty Env. HealthCounty Env. HealthCounty Env. Health

County locator

Dallas County in Iowa

58
County map
Dallas County highlighted among the Iowa counties · colored by Index score

How Dallas County scores

Seclusion37100% ev.
Self-Sufficiency53100% ev.
Admin Boringness48100% ev.
Durability67100% ev.
Property Autonomy51100% ev.
Carry Cost50100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$356kTypical home
1.5%Property tax
$10,688Land / acre
35.3"Annual rain
11.3% of yrsSevere drought
5.8 / yr (+5.3)Mid-century 100°F days
16.9 daysMid-century dry spell
1.84" (+8.1%)Mid-century 1-day rain
1.74×Wildfire change factor
100%Forward climate coverage
$1,766Home insurance / yr
3.7% / yrInsurance growth
1%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
34,791People within 30 min
1,994,740People within 2 hr
118,879Radius comparison (15 mi)
188.8People / sq mi
0.3%Federal land
93.6%Land at 15% slope or less
33.2%Soils rated "not limited" for septic (strict USDA rating)
123,334 acWorkable land screen
12.6%Wooded land
41 tonsBiomass / forest ac
49.4°FAvg temp

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Cities and towns in Dallas County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Bouton · Dallas Center · Dawson · De Soto · Dexter · Granger · Linden · Minburn · Perry · Redfield · Woodward

Answers from the rulebook for Dallas County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Dallas County rules

  • Building permitRequired

    Buildings and structures in the county building-permit process.

    • Applications are required for any and all buildings or structures, including pools and ground-mounted solar installations.
    • Work cannot begin without an issued permit.
    • Dwelling permits require the listed sub-permits and supporting documents before issuance.
    “Please fill out a building permit application thoroughly for any and all buildings or structures, including pools and ground mounted solar installation, or any other structures not listed.”
  • Building code adoptedAdopted

    Dallas County Chapter 47 building codes administered through Planning & Development.

    • The Code of Ordinances page identifies Chapter 47 as Building Codes and states it was amended August 18, 2009.
    “Chapter 47: Uniform Construction Codes Ordinance (PDF)”
  • County-wide zoningPresent (with conditions)

    Zoning regulation in Dallas County's unincorporated areas.

    • The cited ordinance applies to unincorporated areas of Dallas County.
    “The Zoning Ordinance is one of the documents that allows the Department of Planning and Development to regulate the physical state and physical development of the unincorporated areas of the county.”
  • Local zoningPresent (with conditions)

    Land-use regulation and zoning districts in the unincorporated areas of Dallas County, Iowa.

    • The county zoning ordinance applies to the unincorporated area of Dallas County.
    • Agricultural land and farming activity while so used are exempt under Iowa Code Section 335.2, subject to the ordinance's stated floodplain exception and agricultural-exemption determination process.
    • The cited county sources do not establish zoning administration for incorporated municipalities.

    zoning district classifications: 14 districts

    “In order to carry out the purpose and intent of this ordinance the unincorporated area of Dallas County, Iowa, is hereby divided into fourteen (14) zoning district classifications as follows:”
  • Zoning districtsPublished

    Dallas County zoning districts in the unincorporated area.

    • Chapter 45 contains district-specific regulations and the county provides a zoning map.
    • District-specific lot area, setbacks, height, and use rules apply.
    “45.13 R-2 One and Two-Family Residential District Regulations”
  • Minimum lot sizeSpecified

    R-2 One and Two-Family Residential District.

    • The minimum lot area is 12,000 square feet where common water and sewer systems are present and two acres where they are absent.

    minimum lot area with common water and sewer: >= 12000 square feet · minimum lot area without common water and sewer: >= 2 acres

    “A. Lot Area: 12,000 square feet when common water and sewer systems are present, and two (2) acres when no common water and sewer systems are present.”
  • SetbacksSpecified

    R-2 One and Two-Family Residential District.

    • Front-yard setbacks are 35 feet from a private road right-of-way and 50 feet from a public roadway right-of-way.
    • Side-yard requirements vary by building height/stories.

    front yard private road right-of-way: >= 35 feet · front yard public roadway right-of-way: >= 50 feet · rear yard: >= 40 feet

    “C. Front Yard: 35 feet from a private road right-of-way; 50 feet from a public roadway right-of-way.”
  • Building heightSpecified

    R-2 One and Two-Family Residential District.

    • Principal buildings may be up to 35 feet; accessory buildings may be up to 20 feet.
    • The ordinance also limits principal buildings to three stories and accessory buildings to one story.

    principal building maximum height: <= 35 feet · accessory building maximum height: <= 20 feet

    “F. Maximum Height: Principal building--35 feet. Accessory building--20 feet.”
  • Who permits septicMixed (with conditions)

    Private septic systems within Dallas County.

    • Dallas County Environmental Health enforces state code and county health regulations and permits private septic systems.
    • Soil analysis and design by an approved entity are required before an installation permit.
    • Alternative systems require an approved maintenance-provider contract before permitting and for the life of the system.
    • Installation and repair must be performed by an approved septic contractor.
    “The Environmental Health Department is the administrative authority for enforcing state code (PDF) , enforcing county health regulations (PDF) , and permitting private septic systems within Dallas County.”
  • Septic permitRequired

    Private septic installation and specified building/occupancy changes in Dallas County.

    • Soil analysis and design by an approved entity must precede an installation permit.
    • The building-permit page states septic permits are required when adding bedrooms or occupancy or connecting to an existing septic.
    “Dallas County ordinance requires that a soil analysis and design be done by an approved entity prior to submitting an installation permit.”
  • Septic inspectionRequired

    Septic inspections before transfer of title.

    • The county page states that septic inspection has been required by state law since July 2009 before transferring title.
    “Time of Transfer : septic inspection required by state law since July 2009 before transferring title”
  • Well permitLimited

    Private well services and geothermal heat-pump wells.

    • Dallas County adopts Iowa Administrative Code Chapter 38 on private water well construction permits.
    • For geothermal heat-pump systems, the contractor or homeowner must apply before construction.
    • The driller must notify the County Sanitarian before burial of geothermal loops.
    • Permit fees are set by the Board of Health and permits are valid for a maximum of one year.

    permit validity: <= 1 year (maximum validity from issuance)

    “The Environmental Health Department is the administrative authority for permitting well services in Dallas County.”
  • Subdividing landRegulated (with conditions)

    Land subdivision in the unincorporated area of Dallas County.

    • Chapter 42 is enforced by the Department of Planning and Development.
    • The regulations are minimum requirements for regulation and control of land subdivision.
    “Dallas County has adopted these regulations as minimum requirements for the regulation and control of land subdivision within the unincorporated area of the county.”
  • Driveway accessRequired

    New entrances to county roads and modifications or improvements to existing entrances.

    • Approved entrance permits must be obtained through Secondary Roads.
    • For state roads, contact the Iowa DOT.
    • The Road Superintendent conducts an on-site review of sight distances and construction standards.
    • There is no charge for the permit.

    permit fee: 0 USD

    “An access permit is required prior to any construction. Although there is no charge for the permit, the Road Superintendent must meet with the applicant on-site to evaluate sight distances and review construction standards.”
  • Permit feesPublished

    Dallas County building, electrical, plumbing, and mechanical permits administered by Planning & Development for construction in unincorporated Dallas County.

    • The Building Official calculates the building-permit fee after reviewing the application materials.
    • Building-permit valuation is based on square-footage construction costs derived from International Building Code Council data, using national-average construction costs adjusted for Iowa, and the resulting value is applied to the county table.
    • The minimum building-permit fee is $80.00.
    • Electrical, plumbing, and mechanical permits are each flat fees of $80.00.
    • Credit/debit-card payments are online only and service fees apply.
    • The county states that the fee information is for estimating purposes only; applicants should not submit payment unless directed by Planning & Development.
    • The county page also states that additional inspection or reinspection fees may be required when additional inspections are needed, including for incomplete or unsatisfactory work.

    minimum building permit fee: >= 80 USD · electrical permit fee: 80 USD (Flat fee) · plumbing permit fee: 80 USD (Flat fee) · mechanical permit fee: 80 USD (Flat fee) · building permit fee: variable USD (Calculated from project valuation using the county table)

    “The minimum fee for a Building Permit is $80.00. Electrical, Plumbing and Mechanical Permits are each a flat fee of $80.00.”
    One more reviewed finding on this topic
    • Published (with conditions) — Dallas County building, pool, electrical, mechanical, and plumbing permit fees administered by Planning and Development for unincorporated Dallas County.
      “Upon reviewing application materials, the Building Official calculates the permit fee by determining the value of the project. The value is based upon the square footage construction costs derived from data collected by the International Building Code Council (national average construction costs, adjusted for the State of Iowa) and finding that value on the table below. The minimum fee for a Building Permit is $80.00. Electrical, Plumbing and Mechanical Permits are each a flat fee of $80.00.”

Iowa rules that apply here

  • Owner-builder exemptionAvailable (with conditions)

    A person performing work or having work performed on the person's own property, for purposes of Iowa Code chapter 91C contractor registration.

    • The exemption is from being treated as a contractor for purposes of chapter 91C; it is not stated to waive building permits, building-code compliance, inspections, or certificates of occupancy.
    • The separate annual-earnings threshold is less than $2,000, but the own-property exemption is stated independently.
    • A contractor doing business in Iowa must register under chapter 91C unless an applicable statutory exclusion applies.
    “However, a person who earns less than two thousand dollars annually or who performs work or has work performed on the person’s own property is not a contractor for purposes of this chapter.”
  • InspectionsLimited

    Buildings and structures subject to Iowa Code section 103A.10A, including newly constructed state-owned buildings, state-board-of-regents buildings, and certain state-funded buildings.

    • Newly constructed state-owned buildings and structures subject to the state building code are subject to plan review and inspection, excluding renovations and repairs except as provided by statute.
    • Newly constructed buildings owned by the state board of regents are subject to plan review and inspection, excluding renovations and repairs except as provided by statute.
    • State-funded buildings not wholly owned by the state are subject to state plan review and inspection when the governmental subdivision has not adopted the listed codes or does not perform inspections; otherwise they must comply with the local codes and inspections.
    • For ordinary privately owned construction, inspection administration is governed by the applicable local law or ordinance.
    “All newly constructed buildings or structures subject to the state building code, including any addition, but excluding any renovation or repair of such a building or structure, owned by the state or an agency of the state, except as provided in subsection 2, shall be subject to a plan review and inspection by the commissioner or an independent building inspector appointed by the commissioner.”
  • Certificate of occupancyLimited

    Certificates of occupancy or use for buildings subject to Iowa's State Building Code and certificates approving specified buildings, facilities, or installations for licensure.

    • A local building department issues certificates of occupancy or use when required by ordinance.
    • When issued for a building constructed under the state building code, the certificate must certify conformity with the code and is in the form prescribed by the governing body of the governmental subdivision.
    • For facilities governed by Iowa Administrative Code chapter 481.280, if a certificate of occupancy is required for use, it will not be issued until the inspection fee is paid.
    • Chapter 481.280.5 applies to a certificate approving a building, facility, or installation for occupancy upon request from an owner or owner's agency when applicable rules are satisfied and all fees are paid.
    • The state sources do not require a certificate of occupancy for every building statewide.

    additional reinspection fee: 125 USD (Applies for each additional reinspection after the initial reinspection when original deficiencies remain uncorrected.)

    “Issue certificates of occupancy or use, permits, licenses, and other documents in connection with the construction of buildings or structures as may be required by ordinance. (1) A certificate of occupancy or use for a building or structure constructed in accordance with the provisions of the state building code shall certify that the building or structure conforms to the requirements of the code. The certificate shall be in the form the governing body of the governmental subdivision prescribes.”
  • Minimum dwelling sizeDistrict specific (with conditions)

    Minimum dwelling-size standards imposed by county zoning regulations on manufactured homes in Iowa.

    • County zoning under chapter 335 is optional and applies only where the county board of supervisors has adopted it.
    • The local standard must be the same standard applicable to a site-built single-family dwelling on the same lot.
    • The cited provision does not supply a statewide numeric minimum square-footage value.
    “However, a zoning ordinance or regulation shall require that a manufactured home be located and installed according to the same standards, including but not limited to a permanent foundation system, set-back, and minimum square footage, which would apply to a site-built, single family dwelling on the same lot, and shall require that the home is assessed and taxed as a site-built dwelling.”
  • Lot coverageDistrict specific (with conditions)

    Lot-coverage limits administered through Iowa county zoning districts, where adopted.

    • County zoning powers apply only outside city corporate limits.
    • The statute authorizes regulation of the percentage of a lot occupied but does not state a statewide percentage.
    • Agricultural-use and floodplain exceptions in §335.2 apply.
    “the percentage of lot that may be occupied”
  • Manufactured homesAllowed (with conditions)

    Placement and residential occupancy of manufactured homes under county zoning statewide in Iowa

    • A county may not disallow the proposed residential structure solely because it is a manufactured home.
    • The home must be located and installed under the same standards applicable to a site-built single-family dwelling on the same lot, including permanent foundation, setback, and minimum square footage standards.
    • The home must be assessed and taxed as a site-built dwelling.
    • A county may not require an incompatible perimeter foundation system and may not require more than one permanent foundation system.
    • Outside a manufactured home community or mobile home park, requirements may ensure visual compatibility of the permanent foundation system with surrounding residential structures.
    • Recorded restrictive covenants are not abrogated.
    • Counties may regulate transportation, water, sewerage, and other land development; the statute also bars width standards greater than twenty-four feet and certain design standards when federal standards are met.

    maximum mandated width standard: <= 24 feet (if the housing otherwise complies with 42 U.S.C. §5403)

    “A county shall not adopt or enforce zoning regulations or other ordinances which disallow the plans and specifications of a proposed residential structure solely because the proposed structure is a manufactured home. However, a zoning ordinance or regulation shall require that a manufactured home be located and installed according to the same standards, including but not limited to a permanent foundation system, set-back, and minimum square footage, which would apply to a site-built, single family dwelling on the same lot, and shall require that the home is assessed and taxed as a site-built dwelling.”
  • Accessory dwellingsAllowed (with conditions)

    City regulation of accessory dwelling units statewide in Iowa, within a zoning district where a single-family residence is an allowed principal use

    • At least one accessory dwelling unit must be allowed on the same lot as a single-family residence.
    • The accessory dwelling unit must comply with applicable building regulations under chapter 103A.
    • The unit may not exceed 1,000 square feet or 50 percent of the size of the single-family residence, whichever is larger; unfinished basements are excluded from the size calculation.
    • Historic-building-code restrictions, deed restrictions, and common-interest-community rules may limit or prohibit construction or use.
    • A manufactured or mobile home used as the accessory dwelling unit must be converted to real property by placement on a permanent foundation and assessed for real-estate taxes under section 435.26.
    • A historic-preservation area may regulate the unit to the extent the city or commission determines it incongruous and records its reasons.
    • Effective July 1, 2026.

    maximum accessory dwelling unit size: 1,000 square feet or 50% of the single-family residence, whichever is larger (unfinished basements excluded from the size calculation)

    “A city shall allow a minimum of one accessory dwelling unit on the same lot as a single family residence within a zoning district where a single family residence is an allowed principal use, in accordance with the following conditions:”
    One more reviewed finding on this topic
    • Allowed (with conditions) — County regulation of accessory dwelling units statewide in Iowa, within a zoning district where a single-family residence is an allowed principal use
      “A county shall allow a minimum of one accessory dwelling unit on the same lot as a single family residence within a zoning district where a single family residence is an allowed principal use, in accordance with the following conditions:”
  • Agricultural exemptionConditional

    Land, farm houses, farm barns, farm outbuildings, and other buildings or structures primarily adapted by reason of nature and area for agricultural purposes, while used for those purposes, under county ordinances adopted pursuant to Iowa Code chapter 335.

    • The exemption applies except to the extent required to implement section 335.27.
    • An ordinance may still apply to any structure, building, dam, obstruction, deposit, or excavation in or on the floodplains of any river or stream.
    • The county may not require an application, approval, or fee for the ordinance to be deemed inapplicable under this section.
    • Qualifying land, farm houses, farm barns, farm outbuildings, or other buildings or structures may qualify independently or in combination with other agricultural uses.
    • Land enrolled in a soil or water conservation program is considered land primarily adapted for agricultural purposes.
    • The exemption concerns ordinances adopted under chapter 335; chapter 335 applies to a county at the option of its board of supervisors.
    “no ordinance adopted under this chapter applies”
  • Permit processPartial

    Requests for access connections, driveways, or entrances to Iowa primary highways administered by the Iowa Department of Transportation.

    • The permitting process is administered by Iowa DOT district offices.
    • The permit application must be approved before work may begin.
    • The approval process may include internal Iowa DOT review by different offices.
    • The applicant may be asked for more information.
    • A traffic impact analysis is required for all Type A and Type B access permits.
    “In Iowa, the permitting process is administered by the Iowa DOT's district offices.”
  • county zoning authorityGeneral

    Iowa counties may adopt zoning ordinances for land and structures within the county but outside the corporate limits of any city.

    • Chapter 335 applies to any Iowa county at the option of its board of supervisors.
    • The zoning power is subject to Iowa Code section 335.2: ordinances generally do not apply to agricultural land, farm houses, farm barns, farm outbuildings, or other structures primarily adapted for agricultural purposes while so used, except that ordinances may apply to structures, buildings, dams, obstructions, deposits, or excavations in or on river or stream floodplains.
    • A county may not require an application, approval, or fee for an ordinance to be deemed inapplicable to qualifying agricultural land or structures.
    • A county may not regulate, restrict, or prohibit the location of permanent buildings or temporary structures used for consumer-fireworks sales pursuant to section 10A.519 in locations zoned commercial or industrial.
    • The board of supervisors may divide the county into zoning districts, and regulations may differ among districts.
    • Regulations and restrictions require public-hearing and notice procedures under sections 335.6 and 331.305; district boundaries must identify the affected township and section and, if possible, streets or roads.
    • Energy-conservation and solar-access objectives do not require zoning in a county that did not have zoning before July 1, 1981.
    “applicable to any county [...] at the option of the board of supervisors [...] outside of the corporate limits of any city.”
  • county building authorityGeneral

    Iowa counties may adopt, administer, and enforce county building codes and may administer and enforce the state building code for buildings, including residential construction, in county jurisdiction outside incorporated municipalities, subject to statutory limitations.

    • A county building code may not apply within the incorporated area of a city except at the city's option.
    • A county building code may not apply within a city's two-mile limit under Iowa Code §414.23 to the extent the city has adopted a building code within that two-mile limit.
    • A county building code may not apply to farm houses or other farm buildings primarily adapted for agricultural purposes while so used or under construction for that use.
    • Administration and enforcement are conducted as prescribed by local law or ordinance.
    • The state building code applies in a governmental subdivision only after the governing body adopts an ordinance accepting it and files a certified copy with the commissioner; the ordinance fixes the effective date, which must be no more than six months after adoption.
    • A local building department may prohibit commencement of construction until a permit is issued after showing compliance with applicable state building-code provisions.
    • Thermal-efficiency energy-conservation standards apply to construction containing heated or cooled enclosed space, but the commissioner must provide appropriate exceptions where applying an energy-conservation requirement would be impractical.
    “The power to adopt, administer, and enforce the state building code shall be exercised in accordance with chapter 103A. The power to adopt by ordinance, administer, and enforce a county building code, is subject to the following restrictions: a. A county building code shall not apply within the incorporated area of a city except at the option of the city, and shall not apply within a city’s two-mile limit referred to in section 414.23, to the extent that the city has adopted a building code within the two-mile limit. b. A county building code shall not apply to farm houses or other farm buildings which are primarily adapted for use for agricultural purposes, while so used or under construction for that use.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Living in an RV — RV occupancy on private land.
  • Camping on your land — Temporary camping on private land.
  • Tiny homes — Tiny-home occupancy.
  • Off-grid sanitation — Off-grid sanitation systems.
  • Mandatory utility hookup — Water and sewer connection requirements.
2 more unanswered
  • Building in a floodplain
  • 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.

Living off-grid in Dallas County, Iowa

Is Dallas County a good place to live off-grid or homestead?

Dallas County scores 58/100 on the Bolthole Index, a solid county profile. Its strengths: mixed durability signals. Watch-outs: about 34,791 people within a 30-minute drive.

Do you need a building permit in Dallas County, Iowa?

Dallas County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Dallas County Environmental Health Department (Dallas County Board of Health, under Iowa DNR). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

How much does land cost in Dallas County, Iowa?

Land in Dallas County runs about $10,688 per acre, based on the latest county data.

What is the water situation in Dallas County?

Dallas County gets about 35.3" of rain a year, with severe drought in roughly 11.3% of years.

How remote is Dallas County?

A representative private-land location has about 34,791 people within a 30-minute drive and 1,994,740 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Dallas compares in Iowa

Compare side-by-side →See all 99 Iowa counties ranked →