Hardin County, IA: Owner-Builder Allowed

Hardin County has no building inspector and does no code inspections after the permit is issued¹. Septic permits are separate: obtain a construction permit before installing or altering a system². A driveway permit is also required before a new rural address is assigned³.

At a glance

Building permit: Required ("permit to build"), administered by the Zoning Administrator with an on-site review¹
Code inspections: None after issuance — Hardin County has no building inspector¹
Septic permit: Required before installing or altering a private sewage system; filed with the County Sanitarian^2,4
Owner-builder: Building your own home exempts you from Iowa's contractor-registration law, not from the permit itself⁵
Manufactured homes: Cannot be zoned out solely for being manufactured, but must meet the same foundation, setback and size standards as a site-built home⁶
Septic soils: About a quarter of the county's soils are free of severe limits for a conventional drain field⁷

Who to call

Zoning

Hardin County Planning and Zoning

Building/zoning permits, zoning ordinance and map administration, and 911 addressing coordination for unincorporated Hardin County

641-849-7372

708 16th St., Eldora IA 50627

Septic permits

Hardin County Environmental Health / County Sanitarian

Septic (private wastewater) system permits under Iowa Code Chapter 69 for Hardin County

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

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

Hardin County requires a "permit to build" before new construction, administered by the county's Zoning Administrator, who conducts an on-site review as part of the application.

Hardin County requires a "permit to build" before new construction, administered by the county's Zoning Administrator, who conducts an on-site review as part of the application¹. The application asks for applicant, property, structure, parcel, zoning, dimensions, setbacks, valuation and contractor information, and the Zoning Official may request a complete set of building plans⁸. Hardin County has no building inspector and performs no code inspections after the permit is issued¹. Iowa's state building code applies to a county's private construction when the county adopts it by ordinance; we could not confirm whether Hardin County has adopted the state code, so ask Planning and Zoning what standard applies to the proposed structure⁹. Iowa's owner-builder rule exempts work on your own property from contractor registration, but it does not waive Hardin County's permit⁵. The county's building-permit form also has a field for sewer-system approval and for the septic tank and absorption-field location, signed off by the Hardin County Sanitarian and the Zoning Administrator⁸.

Who is the Hardin County Zoning office, and how do you reach them?

Hardin County Planning and Zoning administers the county's zoning ordinance and maps and is the first stop for a building or zoning permit in the unincorporated county.

Hardin County Planning and Zoning administers the county's zoning ordinance and maps and is the first stop for a building or zoning permit in the unincorporated county^1,10. The Planning and Zoning office is at 708 16th St., Eldora IA 50627, and its direct number is 641-849-7372¹⁰. The county's zoning page publishes a county zoning reference atlas and the zoning ordinance, giving buyers a place to identify the parcel's district before designing a house or outbuilding¹⁰. Bring enough information to complete the county application, including parcel and zoning details, dimensions, setbacks, project valuation and contractor information; the Zoning Official may also request full building plans⁸.

How do septic permits work in Hardin County?

Obtain a construction permit before installing or altering a private sewage disposal system in Hardin County; the county identifies its Sanitarian as the filing authority.

Obtain a construction permit before installing or altering a private sewage disposal system in Hardin County; the county identifies its Sanitarian as the filing authority^2,4. Before issuing that permit, the administrative authority must evaluate the site, with soil characteristics and permeability determined through a percolation test or soil analysis². A newly built system needs an on-site final inspection before backfilling and a final as-built drawing kept with the permit². About 27% of Hardin County's soils are rated without severe limitations for a conventional drain field, so do not assume a standard system will fit a parcel⁷. For an existing home, Iowa generally requires a septic inspection before a qualifying ownership transfer; the inspection remains valid for two years¹¹. Ask Planning and Zoning to connect you with Environmental Health before planning the system¹⁰.

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

We could not confirm a Hardin County rule allowing full-time RV living or temporary camping on a private rural parcel, so ask Planning and Zoning about the parcel and proposed length of stay before bringing in an RV¹⁰. Hardin County cannot reject a manufactured home's plans solely because the home is manufactured, but the home must sit on a permanent foundation and meet the same setback and minimum-square-footage standards that apply to a site-built house on the same lot, and it has to be assessed and taxed like one⁶. Iowa requires counties to allow at least one accessory dwelling unit on the same lot as a single-family home where that principal use is allowed; the unit may be up to 1,000 square feet or half the primary home's size, whichever is larger, beginning July 1, 2026¹². A tiny home intended as the principal dwelling still needs Hardin County's permit to build and must satisfy the parcel's zoning standards¹.

What should you check before buying land in Hardin County?

Ask the Sanitarian's office about soil suitability before you assume a standard septic field will work: about a quarter of Hardin County's soils are rated free of severe limitations for a conventional drain field, which is decent by regional standards but still means most parcels warrant a site-specific check⁷. If the parcel already has a home, ask whether its septic system has a current Time of Transfer inspection, since Iowa requires one before a qualifying ownership transfer can close¹¹. Confirm that the parcel can get an approved driveway permit, because Hardin County will not assign a new rural address without one³. Confirm the zoning district with Planning and Zoning, and remember that a Hardin County building permit does not come with code inspections, so any existing structure's condition is on you and your inspector to verify, not the county¹. The land itself is easy to build on: nearly 98% is at 15% slope or less, though only about 5% of the county is wooded, so expect open ground rather than tree cover for privacy or windbreaks⁷. Property taxes run at an effective rate near 1.4%, with a median annual bill around $1,613 countywide⁷.

Watch-outs

Do not backfill a newly built private sewage system until the required on-site final inspection is complete².
Hardin County performs no code inspections after issuing a building permit, so passing the county's process is not the same as a code-compliant build; consider arranging private inspections¹.
Iowa's owner-builder exemption only excuses you from registering as a contractor under Chapter 91C — it does not waive Hardin County's building permit or its septic approval step⁵.

Sources

12 official pages, each quoted and re-checked · written October 10, 2026

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.

Off-grid gear

Going off-grid in Hardin County means bringing your own water and power. The kit we’d start with:

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Compared with neighboring counties

Like 5 of its 6 neighbors, Hardin County requires a building permit for a home.

Rule	Hardin County	Hamilton County	Grundy County	Story County	Marshall County	Franklin County	Butler County
Building permit	Required	Not required	Required	Required	Required	Required	Required
County zoning	Yes	No	Yes	Yes	Yes	Yes	Yes
Septic permits	County Env. Health	County Public Health	County Sanitarian	County Env. Health Dept.	County Env. Health	County Env. Health Dept.	County Env. Health

Cities and towns in Hardin 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 covered: Alden · Buckeye · New Providence · Owasa · Steamboat Rock · Union · Whitten

Answers from the rulebook for Hardin County

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

Hardin County rules

Building permitRequired
Erecting, altering, constructing, reconstructing or moving any structure in unincorporated Hardin County
- Zoning administrator conducts an on-site review during the application process
- No further inspections after the permit is issued
- County has no building inspector
- Application is a PDF form on the county site
“hardin county requires that a permit be obtained before any structure is erected, altered, constructed, reconstructed, or moved.”
Planning and Zoning - Hardin County ↗Re-checked Nov 13, 2026
County-wide zoningPresent (with conditions)
Unincorporated Hardin County
- County zoning ordinance dated 1999 with amendments; articles for W, G, A, R-1, R-2, R-3, C and M districts
- Incorporated cities not covered
“the planning and zoning department is responsible for planning, zoning regulations, and building in the unincorporated area of hardin county.”
Planning and Zoning - Hardin County ↗Re-checked Nov 13, 2026
Minimum lot sizeDistrict specific (with conditions)
Minimum acreage for building in unincorporated Hardin County
- Depends on the zoning of the particular property
- 2 acres is described only as typical, not as a fixed rule
- Exact per-district figures are in ordinance articles not opened
typical minimum lot size: 2 acres (varies by zoning district)
“the minimum acreage required depends upon the zoning of the particular property. typically, 2 acres is the minimum size lot.”
Planning and Zoning - Hardin County ↗Re-checked Nov 13, 2026
Mandatory utility hookupConditional
Utility and wastewater approval associated with a county building permit.
- The building permit form includes an approved sewer-system field and a septic-tank/absorption-field location field.
- The source does not establish a universal public water or sewer connection requirement.
“Office Use Only Approved Sewer System: Approved Zoning Application: Hardin County Sanitarian Hardin County Zoning Administrator”
Application for Building Permit ↗Re-checked Oct 4, 2026
Driveway accessRequired
A new rural address in Hardin County.
- An approved Driveway Permit is required before an address will be assigned.
“Request a new rural address through the Hardin County IT Department. Property owners must have an approved Driveway Permit before an address will be assigned.”
hardincountyia.gov ↗Re-checked Oct 4, 2026
Permit processPartial
The Hardin County building-permit application process for construction in unincorporated areas.
- The form requires applicant, property, structure, parcel, zoning, dimensions, setbacks, valuation, and contractor information.
- The form states: "In addition to the above, it may be necessary to furnish the Zoning Official with a complete set of building plans, if requested."
“In addition to the above, it may be necessary to furnish the Zoning Official with a complete set of building plans, if requested.”
Application for Building Permit ↗Re-checked Sep 26, 2026

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.”
Iowa Code 2026, Chapter 91C — Construction Contractors ↗Re-checked Sep 11, 2026
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.”
Building Code Plan Review ↗Re-checked Sep 11, 2026
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.”
Iowa Code 2026, Chapter 103A — State Building Code ↗Re-checked Sep 11, 2026
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.”
Iowa Code 2026, Chapter 103A — State Building Code ↗Re-checked Sep 11, 2026
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.”
Iowa Code 2026, Chapter 335 — County Zoning ↗Re-checked Oct 5, 2026
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.”
Iowa Code 2026, Chapter 335 — County Zoning ↗Re-checked Oct 5, 2026
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”
Iowa Code 2026, Chapter 335 — County Zoning ↗Re-checked Oct 5, 2026
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.”
Iowa Code §335.30, Manufactured and modular homes ↗Re-checked Sep 11, 2026
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:”
legis.iowa.gov ↗Re-checked Sep 11, 2026
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:”
  legis.iowa.gov ↗Re-checked Sep 11, 2026
Who permits septicMixed (with conditions)
Statewide private sewage disposal regulation is shared between the Iowa Department of Natural Resources and county boards of health.
- County boards of health must adopt and enforce standards at least as stringent as, and consistent with, commission standards.
- The Department of Natural Resources retains concurrent authority and regulates direct discharges to waters of the state.
- If a county board of health fails to fulfill its responsibilities, the department may exercise departmental authority.
“Each county board of health shall regulate the private water supply and private sewage disposal facilities located within the county board’s jurisdiction, including the enforcement of standards adopted pursuant to this section.”
Iowa Code §455B.172, Jurisdiction of department and local boards ↗Re-checked Sep 11, 2026
Septic permitRequired
Installation or alteration of private sewage disposal systems (PSDSs) statewide in Iowa, including systems serving four homes or fewer or fewer than 15 people.
- A construction permit issued by the administrative authority must be obtained before construction.
- The administrative authority is the Iowa DNR or the local county board of health.
- Local boards of health have primary responsibility for PSDSs serving four homes or fewer or fewer than 15 people; the Iowa DNR has primary responsibility for larger public systems.
- Repair of existing PSDS components that does not change treatment or disposal of the waste is not considered an alteration, but discharge restrictions continue to apply.
- When a publicly owned treatment works is available, or a local ordinance requires connection, a PSDS may not be installed, repaired, or rehabilitated; a POTW may be considered unavailable when it is more than 200 feet from the proposed building or exterior drainage facility, subject to the administrative authority’s final determination.
- When a POTW is unavailable, every building where persons generate domestic sewage must be provided with an approved PSDS; a holding tank may be used only if all other PSDS options are impractical.
- All constructed or altered PSDSs must comply with Chapter 69, and newly constructed systems require an administrative-authority final inspection before backfilling.
- Systems discharging to designated waters of the state or subsurface drainage tile must comply with NPDES General Permit No. 4 and submit a Notice of Intent before use.
POTW distance threshold: <= 200 feet (A POTW may be considered unavailable when it is more than 200 feet from the proposed building or exterior drainage facility.) · regulated residential scale: 4 homes or fewer or less than 15 people (Larger public systems are primarily regulated by the Iowa DNR.)
“69.1(4) Construction permit required. No PSDS shall be installed or altered as described in 69.1(3)“b” unless a construction permit issued by the administrative authority is obtained prior to construction. PSDS installation shall be in accordance with these rules.”
Chapter 69 — Private Sewage Disposal Systems ↗Re-checked Oct 5, 2026
One more reviewed finding on this topic
- Required — Private sewage disposal systems in Hardin County, including installation or alteration of a private sewage disposal system.
  “69.1(4) Construction permit required. No PSDS shall be installed or altered as described in 69.1(3) “b” unless a construction permit issued by the administrative authority is obtained prior to construction. PSDS installation shall be in accordance with these rules.”
  Iowa Administrative Code — Chapter 567.69, Private Sewage Disposal Systems ↗Re-checked Sep 29, 2026
Septic inspectionRequired
Private sewage disposal systems serving buildings with one through four dwelling units, before qualifying ownership transfers statewide.
- Inspection is required before transfer of ownership, including seller-financed real estate contracts.
- The county recorder may not record the deed or conveyance document without a certified inspector report, unless weather or temporary physical conditions prevent inspection and the buyer executes a binding acknowledgment.
- The requirement applies to sale, exchange, real estate contract, or other purchase of real estate and improvements.
- Exceptions include specified court-ordered, foreclosure-related, fiduciary, family, demolition, recently installed system, partition, tax-sale, low-consideration, and qualifying family-entity transfers.
- The septic tank must be opened and pumped at inspection, unless evidence shows it was properly pumped within three years before inspection by a licensed commercial septic tank cleaner.
- A failing system must be renovated; a properly treating system without an unsanitary condition need not meet current construction standards.
- Only a department-certified inspector may conduct the inspection.
- An inspection is valid for two years for ownership transfers during that period.
dwelling units: 1-4 · inspection validity: 2 years (for ownership transfers during that period) · prior septic pumping evidence: <= 3 years (must be by a department-licensed commercial septic tank cleaner) · civil penalty for fraudulent report: 5000 USD (and certification suspension for one year)
“If a building where a person resides, congregates, or is employed is served by a private sewage disposal system, the sewage disposal system serving the building shall be inspected prior to any transfer of ownership of the building.”
Iowa Code §455B.172, Jurisdiction of department and local boards ↗Re-checked Sep 11, 2026
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.”
Private Well Construction Permits ↗Re-checked Oct 5, 2026
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”
Iowa Code 2026, Chapter 335 — County Zoning ↗Re-checked Oct 5, 2026
Shed and accessory-building permit exemptionConditional
Planning and design services for outbuildings connected with detached residential buildings in Iowa; this is an exemption from Iowa's architect-licensure requirement, not an affirmative exemption from any locally administered building permit or land-use requirement.
- The detached residential building may contain no more than 12 family dwelling units.
- The detached residential building may be no more than three stories.
- The outbuilding must be in connection with the detached residential building.
- Iowa's current residential construction rule adopts the 2024 International Residential Code for covered dwellings and accessory structures, but deletes sections R103 through R114 and their subsections; the cited state rule therefore does not itself preserve the model-code permit administration provisions.
- Local building, zoning, septic, well, electrical, plumbing, and other applicable requirements are not displaced by this architect-licensure exception.
maximum family dwelling units in detached residential building: <= 12 family dwelling units · maximum stories in detached residential building: <= 3 stories
“Detached residential buildings containing twelve or fewer family dwelling units of not more than three stories and outbuildings in connection with the buildings.”
Iowa Code chapter 544A — Licensed Architects ↗Re-checked Nov 4, 2026
One more reviewed finding on this topic
- Conditional — Accessory structures in Iowa: statutory exemption from the licensed-architect requirement for planning and design services (not a general building permit exemption)
  “churches and accessory buildings, whether attached or separate, not more than two stories in height and not exceeding two thousand square feet in gross floor area.”
  Iowa Code 544A.18 Licensed architects – exceptions ↗Re-checked Nov 6, 2026
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”
Iowa Code 2026, Chapter 354 — Platting — Division and Subdivision of Land ↗Re-checked Oct 5, 2026
Building in a floodplainRequired
Development on a regulated Iowa floodplain or floodway in the rule's listed rural, urban, protected-stream, impoundment-related, and dam circumstances.
- State Department approval is required unless the project is instead approved under a delegated community's local floodplain ordinance pursuant to 567—71.2(455B), or is exempt under 567—71.4(455B).
- In rural areas, the rule applies to projects in or on the floodplain of a stream draining ten or more square miles at the downstream end of the project site.
- In urban areas, the rule applies to projects in or on the floodplain of a river or stream draining two or more square miles at the downstream end of the project site.
- On protected streams, the rule applies to channel changes at any location on a river or stream designated as a protected stream under Division III of 567—Chapter 72.
- For new construction, additions, lowering, or reconstruction of specified buildings, facilities, structures, and associated fill, the rule applies without regard to drainage-area size if the project is adjacent to an impoundment with its lowest floor, including any basement, lower than the adjacent dam top; an upstream dam can reasonably cause flooding from principal or emergency spillway discharges; or an upstream dam does not substantially comply with high-hazard criteria and flooding can reasonably be anticipated from overtopping and failure.
- The rule applies to construction, repair, or modification of a dam exceeding the thresholds in 567—73.3(455B).
rural-stream drainage area threshold: >= 10 square miles (At the downstream end of the project site.) · urban-stream drainage area threshold: >= 2 square miles (At the downstream end of the project site.)
“approval is required by the department for any development [...] unless the project is otherwise approved by a delegated community’s local floodplain ordinances”
567—71.1(455B) State floodplain permits ↗Re-checked Nov 4, 2026
Permit feesPublished
Fees imposed and collected by Iowa state agencies, including any state-agency permit fees listed on the Iowa Government Fees Website.
- The website does not include fees for universities or community colleges, open record requests, or costs for purchase of a product or good.
- This claim does not establish local county or municipal permit-fee schedules.
“Fees Imposed & Collected by State Agencies”
State of Iowa Fees ↗Re-checked Sep 11, 2026
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.”
Iowa Code 2026, Chapter 335 — County Zoning ↗Re-checked Sep 21, 2026
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.”
Iowa Code §103A.3 — Definitions ↗Re-checked Oct 5, 2026

Still unanswered

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

Local zoning — Municipal zoning within Hardin County incorporated cities
Zoning districts — Published county zoning districts in unincorporated Hardin County.
Building height — Building height.
Living in an RV — RV occupancy on private land in unincorporated Hardin County
Camping on your land — Temporary camping on private land.

3 more unanswered

Tiny homes
Off-grid sanitation
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 Hardin County, Iowa

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

Hardin County scores 51/100 on the Bolthole Index, a solid county profile. Its strengths: sparse surroundings — about 8,363 people within a 30-minute drive. Watch-outs: workable self-sufficiency basics (36.2″/yr rainfall).

How much does land cost in Hardin County, Iowa?

Land in Hardin County runs about $10,393 per acre, based on the latest county data.

What is the water situation in Hardin County?

Hardin County gets about 36.2" of rain a year, with severe drought in roughly 12% of years.

How remote is Hardin County?

A representative private-land location has about 8,363 people within a 30-minute drive and 1,724,949 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.

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