Bolthole Index

Decatur County, Iowa

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

73Index Score / 100
#7 of 99 in Iowa

Decatur County, Iowa has no confirmed general residential building-permit rule, and the only county zoning we could confirm is an airport tall-structure ordinance, so ask the county about a specific parcel before buying or building12. Septic permits are different: Decatur County requires one before an onsite wastewater system is built or repaired, including inside incorporated cities and towns34. A new driveway entrance onto a county road needs a County Engineer permit5.

At a glance

Building permit
General county requirement not confirmed; ask before building1
Zoning
Only airport tall-structure zoning confirmed countywide; general zoning for unincorporated land not confirmed2
Septic permit
Required before construction or repair3
RV living
Long-term occupancy rule not confirmed; ask the county6
Driveway entrance
County Engineer permit required before building an entrance on a county road5
Owner-builder
Own-property work is exempt from contractor registration, not other requirements7
Manufactured homes
Cannot be rejected solely because the home is manufactured8
Private wells
County participates in the Private Well Program9

Who to call

Septic permits

Decatur County Environmental Health

Environmental Health contact for septic systems, wells and cisterns

641-446-3665

203 NE Idaho St. Leon, IA 50144

Roads & driveways

Decatur County Engineer's Office

Secondary roads and right-of-way entrance permits

641-446-6531

1306 S. Main St. Leon, IA 50144

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

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

A general residential building-permit requirement for unincorporated Decatur County could not be confirmed from an official county rule1. Iowa does not impose one universal local building permit on every private project: the State Building Code applies to specified state-owned, state-funded and factory-built construction, certain larger cities, and a governmental subdivision that accepts the code by ordinance1011. For ordinary private construction, permit issuance and enforcement depend on applicable local law or ordinance11. Before ordering plans or materials, ask the county whether a building-code ordinance, inspection or certificate-of-occupancy requirement applies to the parcel; those local Decatur County details remain unconfirmed1. Separate approvals can still apply even when the general building-permit answer is uncertain: Decatur County requires a permit before constructing or repairing an onsite wastewater system, and a new entrance on a county road has its own county process312.

Who handles building and permit questions in Decatur County?

Decatur County does not identify a confirmed building department or general residential permit office in the available county information1. Start a rural project with the offices that have clearly defined work: Decatur County Environmental Health is the county contact for septic systems, wells and cisterns9, while the Decatur County Engineer's Office maintains secondary roads and issues right-of-way entrance permits12. An entrance permit application takes at least 3 business days to process, costs $25 for residents with an Iowa Homestead Tax Credit on file and $100 for non-residents, and no work may start before the County Engineer approves it5. New entrances are generally limited to one per 40-acre parcel and need at least a 24-foot top width5. Environmental Health lists its office at 203 NE Idaho St. in Leon and its phone as 641-446-36659. The Engineer's Office lists 1306 S. Main St. in Leon and 641-446-653112. For the unresolved building-code, inspection, occupancy and zoning questions, ask county government to identify the ordinance and office that apply to the parcel rather than assuming silence means no rule16. If the property is inside an incorporated city or town, contact that municipality because Iowa county zoning authority concerns land outside city limits13.

Does Decatur County have zoning?

The one county zoning ordinance we could confirm is Ordinance 7, the Airport Tall Structure Zoning ordinance, which is a limited regulation rather than a general zoning ordinance with districts2. Comprehensive zoning for unincorporated Decatur County could not be confirmed, and the available county information does not establish parcel-level setbacks, lot coverage, building height, minimum lot size or minimum dwelling size6. Iowa law allows a county board of supervisors to adopt zoning outside city limits, but the authority is optional rather than automatic13. Iowa's county zoning authority also generally excludes qualifying agricultural land, farmhouses, farm barns and other structures primarily adapted to agricultural use while they remain in that use, with a floodplain exception13. A manufactured home cannot be rejected under county zoning solely because it is manufactured, although it may be held to the same permanent-foundation, setback and minimum-square-footage standards as a site-built home on the same lot8. Ask county government for a parcel-specific zoning answer and contact the relevant city when land lies within municipal limits613.

How do septic permits work in Decatur County?

Decatur County requires a permit before anyone constructs, repairs, reconstructs, alters or installs an onsite wastewater system, and an installation permit must come before construction of or an addition to a building that the system will serve3. Applications for subsurface absorption systems require a professional soil analysis or percolation test plus a property and system sketch3. The County Sanitarian reviews each site, with approval taking at least 5 business days after payment, application and required documents arrive; a permit remains valid for no more than 12 months143. Give the Sanitarian at least 24 hours' notice before work starts, and do not cover or use the system before the mandatory inspection15. Only 0.7% of county soils are rated without severe limits for a conventional drain field, so make the soil evaluation an early contingency in a land purchase16. The county's septic rules apply inside incorporated cities and towns as well, so a city address does not move septic permitting away from the Decatur County Board of Health and Sanitarian4. Fee amounts are in a separate schedule kept at the Environmental Health Office or on the county website17. Environmental Health is the current county contact for septic systems9.

Can you live in an RV or tiny home in Decatur County?

We could not confirm a Decatur County rule allowing or prohibiting long-term RV occupancy, temporary camping, or tiny-home occupancy on unincorporated private land6. We also could not confirm local minimum-home-size, setback or minimum-lot-size rules, so ask county government about the exact parcel and proposed use before moving a unit onto the land6. Wastewater is not an open question: household drainage or sewage may not discharge to a ditch, stream, lake, pond, waterway, drain tile or the ground surface, and covered wastewater uses require an approved onsite system18. Manufactured homes are legally distinct from RVs and improvised tiny homes; Iowa counties may not reject a residential structure solely because it is manufactured, but the home can be subject to the same foundation, setback and minimum-square-footage standards as a site-built house on the same lot8. Confirm the occupancy category first, then speak with Environmental Health before designing wastewater service9.

Building a home in Decatur County: the steps, in order

  1. Confirm whether the parcel is outside an incorporated city, because county zoning authority applies outside city limits and municipal rules may differ13.
  2. Ask county government whether a building-code adoption, residential permit, inspection or occupancy rule applies; the local answer could not be confirmed1.
  3. Contact Decatur County Environmental Health before fixing the house site or septic layout9. A subsurface absorption application needs a professional soil analysis or percolation test and a property and system sketch3.
  4. Allow at least 5 business days for septic review after the complete application, documents and payment arrive14.
  5. Contact the County Engineer before creating or changing an entrance on a county road; the entrance permit must be approved before work, call One-Call at least 48 hours before digging in the right-of-way, and finish within 180 days of approval5.
  6. If you build on your own property, Iowa's owner-builder exclusion concerns contractor registration only and does not itself waive permits, code compliance or inspections19.
  7. Keep the septic system uncovered until the mandatory county inspection is complete15.

What should you check before buying land in Decatur County?

Make septic feasibility a purchase contingency: only 0.7% of Decatur County soils are rated without severe limitations for a conventional drain field, while county applications for subsurface absorption systems require professional soil work163. For an existing home served by private sewage, Iowa generally requires inspection before a qualifying ownership transfer; the rule covers buildings with 1 through 4 dwelling units and an inspection is valid for 2 years20. Confirm legal road access with the County Engineer, especially if the parcel needs a new right-of-way entrance12. Decatur County has about 14.4 people per square mile, and the nearest city of 100,000 or more is about 58 miles from the county center, so price travel and contractor availability into the project2122. Typical effective property tax is about 1.7%, with a median annual bill of about $1,8562324. Finally, get written parcel-specific answers on zoning, floodplain status, building permits, setbacks and occupancy before closing because the local rules on those topics could not all be confirmed61.

Watch-outs

  • A missing confirmed county building-permit rule is not proof that no permit, inspection or certificate is required; ask county government about the parcel and project1.
  • Decatur County septic permits are reviewed site by site, require supporting soil information for subsurface absorption, and take at least 5 business days after a complete submission14.
  • A public sewer must be used instead of a new onsite wastewater system when the Board of Health determines that sewer is reasonably accessible25.
  • We could not confirm local rules for RV living, tiny-home occupancy, setbacks, minimum lot size or minimum dwelling size; ask county government before relying on any of those uses6.

Sources

  1. Iowa Code 2026, Chapter 103A — State Building Code (2026 county census)
  2. County Ordinances, quoted and re-checked
  3. Decatur County Board of Health Rules and Regulations—Chapter 01: On-Site Wastewater Treatment and Disposal Systems, quoted and re-checked
  4. Decatur County Board of Health Rules and Regulations—Chapter 01: On-Site Wastewater Treatment and Disposal Systems, quoted and re-checked
  5. Decatur County Rural Entrance Policy and Entrance Permit Application, quoted and re-checked
  6. County Ordinances (2026 county census)
  7. Iowa Code 2026, Chapter 91C — Construction Contractors (2026 county census)
  8. Iowa Code §335.30, Manufactured and modular homes (Iowa statewide rule), quoted and re-checked
  9. Decatur County Environmental Health (decaturcountyiowa.gov)
  10. Building Code Plan Review (Iowa statewide rule), quoted and re-checked
  11. Iowa Code 2026, Chapter 103A — State Building Code (Iowa statewide rule), quoted and re-checked
  12. Decatur County Engineer's Office (decaturcountyiowa.gov)
  13. Iowa Code 2026, Chapter 335 — County Zoning (Iowa statewide rule), quoted and re-checked
  14. Decatur County Board of Health Rules and Regulations—Chapter 01: On-Site Wastewater Treatment and Disposal Systems, quoted and re-checked
  15. Decatur County Board of Health Rules and Regulations—Chapter 01: On-Site Wastewater Treatment and Disposal Systems, quoted and re-checked
  16. 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
  17. Decatur County Board of Health Rules and Regulations—On-Site Wastewater Treatment and Disposal Systems, quoted and re-checked
  18. Decatur County Board of Health Rules and Regulations—On-Site Wastewater Treatment and Disposal Systems, quoted and re-checked
  19. Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
  20. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  21. Population density: Bolthole Index county data
  22. Straight-line distance from the county center to the nearest city of 100,000+ people: Bolthole Index county data
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data
  25. Decatur County Board of Health Rules and Regulations—On-Site Wastewater Treatment and Disposal Systems, quoted and re-checked

Written October 10, 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

Unlike 5 of its 6 neighbors, Decatur County requires a building permit only in limited cases.

RuleDecatur CountyClarke CountyRinggold CountyWayne CountyUnion CountyLucas CountyWarren County
Building permitLimitedRequiredNot requiredNot requiredLimitedNot requiredRequired
County zoningYesYesNoNoNoNoYes
Septic permitsCounty Env. HealthCounty Env. HealthCounty Env. HealthCounty Env. Health OfficeCounty Env. HealthCounty Public HealthCounty Env. Health

County locator

Decatur County in Iowa

73
County map
Decatur County highlighted among the Iowa counties · colored by Index score

How Decatur County scores

Seclusion71100% ev.
Self-Sufficiency62100% ev.
Admin Boringness6777% ev.
Durability49100% ev.
Property Autonomy51100% ev.
Carry Cost70100% ev.

Evidence strength: 96%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$165kTypical home
1.7%Property tax
$5,732Land / acre
37.9"Annual rain
4.9% of yrsSevere drought
7.2 / yr (+6)Mid-century 100°F days
17.8 daysMid-century dry spell
2.01" (+8.2%)Mid-century 1-day rain
1.76×Wildfire change factor
100%Forward climate coverage
$1,658Home insurance / yr
4.4% / yrInsurance growth
0.77%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
9,394People within 30 min
2,058,936People within 2 hr
8,660Radius comparison (15 mi)
14.4People / sq mi
0.4%Federal land
78.3%Land at 15% slope or less
0.7%Soils rated "not limited" for septic (strict USDA rating)
2,283 acWorkable land screen
24.5%Wooded land
40.6 tonsBiomass / forest ac
50.7°FAvg temp

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Cities and towns in Decatur 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.

Davis City · Garden Grove · Grand River · Lamoni · Le Roy · Leon · Pleasanton · Van Wert · Weldon

Answers from the rulebook for Decatur County

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

Decatur County rules

  • County-wide zoningPresent (with conditions)

    Airport tall-structure zoning adopted by Decatur County; this establishes a limited county zoning regulation, not a verified comprehensive county zoning ordinance.

    • The official county ordinance list identifies only the Airport Tall Structure Zoning ordinance as a zoning ordinance in the listed county code.
    • The source does not establish comprehensive countywide zoning or general zoning districts.

    ordinance number: 7 · adoption date: 01/07/1986

    “Ordinance #7 – Airport Tall Structure Zoning dated 01/07/1986”
  • Who permits septicMixed (with conditions)

    On-site wastewater treatment and disposal systems throughout Decatur County, including incorporated cities and towns.

    • The Decatur County Board of Health and County Sanitarian administer county requirements.
    • Systems must comply with the Iowa Department of Natural Resources rules in Iowa Administrative Code 567, Chapter 69.
    • The county rules state that they apply within the corporate boundaries of incorporated cities and towns.
    • Additional Board of Health requirements may apply.
    “All on-site wastewater treatment and disposal systems located in the County, including the corporate boundaries of incorporated cities and towns, shall be constructed and equipped in accordance with the specifications and requirements set forth by the Department in the most current edition of the Iowa Administrative Code 567, Chapter 69, and to such additional requirements as are prescribed by regulations of the Board of Health.”
  • Septic permitRequired

    Construction or repair of any on-site wastewater treatment and disposal system in Decatur County.

    • The permit must be obtained before construction of, or addition to, any dwelling or building served by the system.
    • The owner must comply with applicable Board of Health and Iowa Department of Natural Resources regulations.
    • Applications for subsurface absorption systems must include a professional soil analysis or percolation test and a property/system sketch.
    • Permits are reviewed site-by-site; minimum approval time is five business days after payment, application, and required documents.
    • Permits are valid for a maximum of twelve months from issuance.

    minimum approval time: >= 5 business days (After receipt of payment, application, and all required documents.) · maximum permit validity: 12 months (The system must be completed within that period or another permit is required.)

    “No person shall begin construction or repair of any on-site wastewater treatment and disposal system for any purpose in the County without first having obtained a permit as set out in this chapter.”
  • Septic inspectionRequired

    Private sewage disposal systems and on-site wastewater systems in Decatur County.

    • The County Sanitarian must receive notice by telephone or in person at least twenty-four hours before work begins.
    • Inspections are scheduled during normal working hours, Monday through Friday, 7:30 AM to 4:00 PM.
    • No part of the system may be used, covered, or constructed in a way that impedes mandatory inspection.
    • For a system serving a new home, inspection is incomplete until the system is connected to the home and usable.
    • For an existing system being repaired, altered, reconstructed, or replaced, the building sewer must be connected before inspection.

    advance notice: >= 24 hours (Before work begins.)

    “No part of any private sewage disposal system shall be used, covered or constructed so as to deny or impede the mandatory inspection by the County Sanitarian.”
  • Off-grid sanitationLimited

    Off-grid sanitation involving household drainage or sewage in Decatur County.

    • Discharge to ditches, streams, lakes, ponds, waterways, county drain tile, surface-water drain tile, or the ground surface is prohibited.
    • An approved on-site wastewater treatment and disposal system is required for covered wastewater uses, subject to county and state requirements.
    “It is prohibited for any household drainage and/or sewage, to discharge to any ditch, stream, lake, pond, natural or artificial waterway, county drain tile, surface water drain tile, or to the surface of the ground.”
  • Mandatory utility hookupSewer (with conditions)

    Installation of an on-site wastewater system where a public sewer is reasonably accessible in Decatur County.

    • An on-site wastewater treatment and disposal system may not be installed when a public sewer is reasonably accessible.
    • Accessibility is determined by the Decatur County Board of Health.
    “No on-site wastewater treatment and disposal system shall be installed when a public sewer is reasonably accessible, as determined by the Board of Health.”
    One more reviewed finding on this topic
  • Driveway accessRequired

    New rural driveways and field entrances connecting to Decatur County public right-of-way, and maintenance that changes entrance dimensions.

    • A permit is required to build an entrance within County Right-of-Way, and the person constructing it must have the permit in their possession.
    • The application requires at least 3 business days for processing.
    • No work may commence without prior approval by the County Engineer.
    • The applicant must obtain One-Call approval at least 48 hours before excavation within the right-of-way.
    • The County Engineer or representative will inspect completed work.
    • Non-conforming work may be stopped, corrected, or removed at the applicant's expense.
    • All work must be completed within 180 days of approval.
    • New entrances must meet the required stopping sight distance, a maximum of one entrance per 40-acre parcel unless additional entrances are separately applied for, a minimum 24-foot top width, applicable Iowa DOT slope and culvert standards, and other policy criteria.
    • Residents with an Iowa Homestead Tax Credit on file are charged $25 per application; non-residents are charged $100. A $50 delivery fee applies if the County delivers a culvert.
    • An entrance permit is required for maintenance that changes entrance dimensions, including widening the top width or replacing the culvert.

    maximum new entrances: 1 per 40-acre parcel (Applicants may apply for additional entrances at their own expense if they meet the County's entrance criteria.) · minimum entrance top width: >= 24 feet · resident application fee: 25 USD per application (Residential rate requires an Iowa Homestead Tax Credit on file with the Decatur County Assessor's Office.) · non-resident application fee: 100 USD per application · project completion deadline: <= 180 days after approval

    “Anyone who seeks to perform non-roadway related activities within County Right-of-Way must obtain permission from the County Engineer's Office.”
    One more reviewed finding on this topic
    • Required — Access of adjacent properties to Decatur County secondary-road right-of-way and construction or dimensional maintenance of rural entrances.
      “Anyone who seeks to perform non-roadway related activities within County Right-of-Way must obtain permission from the County Engineer's Office. This includes requests for access of adjacent properties to County Right-of-Way.”
  • Permit feesPublished (with conditions)

    Decatur County on-site wastewater permit fees.

    • The detailed fee schedule is maintained at the Environmental Health Office or on the county website; fee amounts were not extracted because the linked schedule returned an access error.
    “See separate fee schedule at the Environmental Health Office or the Decatur County Website for a detailed listing of the fees.”
  • Permit processPartial

    On-site wastewater permit process in Decatur County.

    • Applicants file with the Decatur County Board of Health using the current Environmental Health application form.
    • Subsurface absorption applications require a professional soil analysis or percolation test.
    • A property and proposed-system sketch is required.
    • The Sanitarian reviews permits site-by-site.
    • Minimum approval time is five business days after payment, application, and required documents.
    • The permit is issued after payment of applicable fees.

    minimum approval time: >= 5 business days (After receipt of payment, application, and all required documents.)

    “Permits will be reviewed by the Sanitarian and approved on a site-to-site basis. Minimum time for approval will be 5 business days from receipt of payment, application and all required documents. Emergency approval will be at the discretion of the County Sanitarian.”

Iowa rules that apply here

  • Building permitLimited

    Construction subject to Iowa's State Building Code, including state-owned buildings, buildings in governmental subdivisions that adopt the code, certain cities over 15,000 population without a substantially conforming local code, factory-built structures, and construction covered by statewide energy-conservation provisions.

    • Iowa Code section 103A.10 makes the state building code applicable to all state-owned buildings and structures.
    • The code applies in a governmental subdivision where the governing body has enacted an ordinance accepting the code.
    • The code applies in each city with a population over 15,000 that has not adopted a substantially conforming local building code.
    • Factory-built-structure manufacture and installation provisions apply throughout Iowa.
    • Permit issuance and enforcement are administered under local law or ordinance; the state source does not establish one universal permit requirement for every building statewide.
    • A governmental subdivision may prohibit commencement of construction until a local building department issues a permit after compliance is shown.
    • The application must be signed by the owner or authorized agent and include the owner's address, a statement that the application seeks permission to construct under the code, and a statement that construction will comply with applicable energy-conservation requirements.
    “The examination and approval or disapproval of plans and specifications, the issuance and revocation of building permits, licenses, certificates, and similar documents, the inspection of buildings or structures, and the administration and enforcement of building regulations shall be the responsibility of the governmental subdivisions of the state and shall be administered and enforced in the manner prescribed by local law or ordinance. [...] Prohibit the commencement of construction until a permit has been issued by the local building department after a showing of compliance with the requirements of the applicable provisions of the state building code.”
  • 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.”
  • Building code adoptedPartial

    The Iowa State Building Code, including the 2024 International Building Code adopted by reference with Iowa amendments, applies statewide to state-owned buildings and structures, qualifying state-funded construction, certain cities over 15,000 that lack a substantially equivalent local building code, and governmental subdivisions that accept the code by ordinance. Factory-built-structure provisions apply throughout Iowa.

    • In a governmental subdivision, the code generally applies only after the governing body enacts an ordinance accepting applicability and files a certified copy with the commissioner.
    • The local ordinance fixes the effective date, which must be no more than six months after adoption.
    • A governmental subdivision may withdraw after one year by ordinance, following the required public hearing and written notice; the withdrawal date must be at least 180 days after ordinance adoption, and previously issued permits are unaffected.
    • The state building code applies to state-owned buildings and structures and to newly constructed buildings and structures paid for in whole or in part with state-appropriated money but not wholly state-owned.
    • Cities with populations over 15,000 that lack a local building code substantially in accord with nationally recognized standards must enforce the state building code.
    • Factory-built-structure provisions apply throughout the state; an approved factory-built structure is deemed compliant with building regulations applicable to its manufacture and installation and is exempt from other state or local building regulations, subject to the statutory exceptions concerning professional engineering and architecture and manufactured homes.
    • The current administrative rule adopts the 2024 International Building Code by reference with amendments; detached one- and two-family dwellings, certain townhouses not more than three stories, and their accessory structures instead comply with the amended International Residential Code.

    adopted model building code: 2024 International Building Code (Adopted by reference with Iowa amendments.) · current administrative-rule effective date: 2025-09-10 (Iowa Administrative Code Chapter 481.301 source identifies ARC 9474C as effective September 10, 2025.) · local ordinance effective-date limit: <= 6 months after adoption · local withdrawal waiting period: >= 1 year after code became applicable (A governmental subdivision may withdraw only after this period has elapsed.) · withdrawal effective-date minimum: >= 180 days after ordinance adoption (Previously issued permits remain unaffected.)

    “The state building code shall be applicable: [...] In each governmental subdivision where the governing body has enacted an ordinance accepting the application of the code.”
    One more reviewed finding on this topic
    • Adopted (with conditions) — Iowa state building codes relevant to construction in Decatur County when the state code is applicable under Iowa Code chapter 103A.
      “2024 International Residential Code as adopted by Iowa Administrative Rule chapters 481-301”
  • 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.”
  • Minimum lot sizeDistrict specific (with conditions)

    Minimum-lot-size requirements administered through county zoning districts in Iowa, where county zoning has been adopted.

    • County zoning is optional under §335.1.
    • Local zoning districts may have different regulations.
    • A variance may be available only under the statutory practical-difficulties requirements.
    “Area, dimensional, or other numerical limitations subject to variances include but are not limited to requirements for minimum lot size, setbacks, yard widths, height, bulk, sidewalks, fencing, signage, and off-street parking. To receive the requested area, dimensional, or other numerical variance, the property owner must prove that the practical difficulties faced are unique to the property at issue and not self-created and must also demonstrate that granting the variance will not significantly alter the essential character of the surrounding neighborhood.”
  • SetbacksDistrict specific (with conditions)

    Setback requirements administered through Iowa county zoning districts, where adopted.

    • County zoning powers apply only to land and structures outside the corporate limits of any city.
    • Local district regulations may differ by district.
    • Agricultural-use structures and floodplain activities are subject to the exceptions and conditions in §335.2.
    “Subject to section 335.2, the board of supervisors may by ordinance regulate and restrict the height, number of structures, and size of buildings and other structures, the percentage of lot that may be occupied, the size of yards, courts, and other open spaces, the density of population, and the location and use of buildings, structures, and land for trade, industry, residence, or other purposes, and may regulate, restrict, and prohibit the use for residential purposes of tents, trailers, and portable or potentially portable structures. However, such powers shall be exercised only with reference to land and structures located within the county but lying outside of the corporate limits of any city.”
  • 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:”
  • Well permitRequired

    Construction of private water-supply wells statewide in Iowa, including household, livestock, commercial, processing, irrigation, recreational, industrial, monitoring, dewatering, and related wells identified by the Iowa DNR.

    • A private well construction permit is required for all water-supply wells.
    • For private water-supply wells serving fewer than 25 individuals or fewer than 15 water-service connections, permits are issued by local county health departments, except Osceola County, which lacks authority to issue private well construction permits; the Iowa DNR handles permitting there.
    • The applicant must submit an application and county application fee; each county sets its own fee.
    • The county reviews completeness and location relative to contamination sources and issues or denies the permit in writing before construction proceeds.
    • The county and DNR must be allowed to visit the proposed well site before, during, and after construction.
    • Public water-supply wells serving 25 or more individuals or having 15 or more water-service connections require a Public Water Supply Construction Permit issued by Iowa DNR Water Supply Engineering; county private-well programs cannot issue those permits.
    • Private well permits are not required for geotechnical borings without well casing or screens, Geoprobe-style boreholes without temporary or permanent casing, and cathodic-protection wells.
    • Trench dewatering does not require a private well construction permit.
    • Separate water-allocation, NPDES, floodplain, or underground-injection permits may also be required depending on the project.

    public water supply threshold: >= 25 individuals served (A public-water-supply construction permit is also required at 15 or more water-service connections.) · public water supply threshold: >= 15 water-service connections (A public-water-supply construction permit is also required when 25 or more individuals are served.) · geothermal loop depth threshold: >= 20 feet (Closed-loop and open-loop geothermal systems at or beyond this depth require a private well construction permit.)

    “Private Well Construction Permits are required for all water supply wells, and for all geothermal systems - closed-loop and open-loop - that are 20 feet or greater in depth.”
  • 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”
  • Subdividing landRegulated (with conditions)

    Subdivision of land in Iowa by repeated or simultaneous division into three or more parcels, subject to statutory exceptions and local review.

    • A subdivision plat is required when a tract is subdivided by repeated divisions or simultaneous division into three or more parcels described by metes and bounds for which no plat of survey is recorded.
    • A subdivision plat is not required when land is divided by conveyance to a governmental agency for public improvements.
    • Local cities and counties may establish and enforce ordinances regulating division and use of land within the statutory framework.

    minimum parcels triggering subdivision plat: >= 3 parcels (A plat is not required for division by conveyance to a governmental agency for public improvements.)

    “A subdivision plat shall be made when a tract of land is subdivided by repeated divisions or simultaneous division into three or more parcels”
  • 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.

  • Local zoning — Aggregate local zoning across Decatur County municipalities and unincorporated areas.
  • Zoning districts — Published zoning districts in Decatur County.
  • Building height — Building-height limits in Decatur County, including Airport Tall Structure Zoning Ordinance #7.
  • Living in an RV — Long-term recreational-vehicle occupancy on private land in Decatur County, Iowa.
  • Camping on your land — Temporary camping on private land in Decatur County.
3 more unanswered
  • Tiny homes
  • 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 Decatur County, Iowa

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

Decatur County scores 73/100 on the Bolthole Index, a strong county profile. Its strengths: sparse surroundings — about 9,394 people within a 30-minute drive and manageable long-term carry cost.

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

Decatur County requires a building permit only in limited cases (such as floodplains or specific zones), and it enforces county zoning. Onsite septic is permitted by Decatur County Environmental Health (Public Health). 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 Decatur County, Iowa?

Land in Decatur County runs about $5,732 per acre, based on the latest county data.

What is the water situation in Decatur County?

Decatur County gets about 37.9" of rain a year, with severe drought in roughly 4.9% of years.

How remote is Decatur County?

A representative private-land location has about 9,394 people within a 30-minute drive and 2,058,936 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 Decatur compares in Iowa

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