Bolthole Index

Harrison County, Iowa

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

60Index Score / 100
#31 of 99 in Iowa

Unincorporated Harrison County, Iowa requires a permit for new construction, reconstruction, or moving any structure on rural property1. Harrison County administers zoning in rural, unincorporated areas, while incorporated municipalities may have separate rules23. Private sewage-disposal and water-supply permits must be issued before the building permit when either applies4.

At a glance

Building permit
Required for new construction, reconstruction, or movement of any structure in rural Harrison County1
Zoning
County-administered in rural, unincorporated areas; incorporated municipalities may have separate rules23
Septic permits
Harrison County Environmental Health Department; required before a building permit for new construction using private sewage disposal56
Owner-builder
A person performing work on their own property is not treated as a contractor under Iowa's registration law, but building permits and codes still apply78
Manufactured homes
Counties can't reject a manufactured home's plans solely because it's manufactured, but it must meet the same foundation, setback and size standards as a site-built home9
Accessory dwelling units
Iowa counties must allow at least one ADU per single-family lot, up to 1,000 square feet or half the main home's size, starting July 1, 202610
Private wells
A county permit covers new and reconstructed wells; new wells require on-site review and approval11
Septic soil difficulty
44.1% of county soils have no severe limits for a conventional drain field12

Who to call

Building permits

Harrison County Environmental Health, Planning & Zoning

Building permits, zoning administration and appeals, E911 rural addressing, floodplain (F-1) district information, and septic (private sewage disposal) and private well permits and inspections for unincorporated Harrison County

(712) 644-2302

[email protected]

111 N. 2nd Avenue, 2nd Floor Courthouse, Logan, IA 51546

Roads & driveways

Harrison County Engineer's Office

County secondary roads and roadway-use permits, including driveway and field-entrance approvals

(712) 644-3140

301 North 6th Ave, Logan, IA 51546

Contact details are copied from each office’s official page and were checked against it on September 29, 2026.

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

Yes. Harrison County requires a permit for new construction, reconstruction, or movement of any structure on rural property1. Planning & Zoning provides applications for new construction, remodeling, and repairs; the required filing fee must be paid before the county acts on an application413. New construction using private sewage disposal or a private water supply must receive that permit before Harrison County issues the building permit4. An owner working on their own property is excluded from Iowa contractor registration, but that registration exemption does not waive permits or applicable codes8. An occupancy compliance certificate is required only when the zoning ordinance calls for one, not necessarily for every project14. We could not confirm which building-code edition or structural inspections apply to ordinary rural construction, so ask Planning & Zoning before work begins.

Who is the Harrison County building department, and how do you reach them?

Harrison County's Environmental Health, Planning & Zoning Department, led by its Administrator, is on the 2nd floor of the County Courthouse at 111 N. 2nd Avenue in Logan, Iowa, phone (712) 644-230215. Office hours run Monday through Friday, 7:00 a.m. to 3:30 p.m.15. This one department covers building permits, zoning determinations, E911 rural addressing, floodplain information, and septic and well permits, so it's your single point of contact for nearly everything covered in this guide15. A legal description or plat of survey, with the area identified on a digital photo, is required for rural zoning inquiries15.

Does Harrison County have zoning?

Yes, for rural and unincorporated Harrison County; incorporated municipalities may have separate local rules23. Iowa law allows counties to zone land outside city limits and to apply different regulations in different districts16. Qualifying agricultural land and structures are generally outside county zoning while used for agricultural purposes, although county floodplain rules can still apply in river or stream floodplains16. Harrison County identifies Floodplain District F-1 and says district regulations list special-exception uses, but the complete district schedule is not available in the reviewed material1718. Rural subdivisions are regulated, and the Zoning Commission reviews subdivision applications19. Ask Planning & Zoning for the parcel's district, setbacks, and subdivision standards. A Board of Adjustment appeal has a $100 fee and must be filed within 30 working days after the final decision4.

How do septic permits work in Harrison County?

Harrison County Environmental Health licenses and inspects private septic-system construction5. New private septic construction requires a site review, an inspection before any portion is covered, and a final inspection with a location diagram kept on file20. New rural construction using private sewage disposal must receive its sewage-disposal permit before the building permit, so an off-grid plan does not bypass sanitation review21. Buyers may request a county on-site evaluation of an existing rural septic system before purchase20. Iowa also requires qualifying private systems serving 1–4 dwelling units to be inspected before ownership transfers; the tank generally must be opened and pumped unless properly pumped within the prior 3 years, and an inspection remains valid for 2 years22. Only 44.1% of Harrison County soils lack severe limits for a conventional drain field, so get the site review before fixing the house location or system design1220.

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

We could not confirm whether full-time RV occupancy or temporary camping is allowed on private rural land in Harrison County. Ask Planning & Zoning about the intended duration, utilities, septic plan, and zoning district before buying or moving an RV onto a parcel. Iowa prevents a county from rejecting a residential structure solely because it is a manufactured home, but the home remains subject to the same applicable foundation, setback, and minimum-area standards as a site-built single-family dwelling on the same lot9. Beginning July 1, 2026, an Iowa county must allow at least one accessory dwelling unit on a single-family lot in a district where a single-family residence is an allowed principal use; the unit may be up to 1,000 square feet or 50% of the main residence, whichever is larger10. Harrison County's specific tiny-home, minimum-size, and setback rules remain unconfirmed, so obtain a parcel-specific determination from Planning & Zoning before ordering a unit.

What are the steps to build a home in Harrison County?

  1. Ask Environmental Health, Planning & Zoning for the parcel's district, setbacks, subdivision standards, and any Floodplain District F-1 designation1917.
  2. Obtain the private-sewage or private-water permit first when either applies to new construction4. New wells require county on-site review and approval11.
  3. For septic, complete the site review and arrange the construction-stage inspection before covering any portion of the system20.
  4. Submit the building application and required filing fee; Harrison County takes no action until the fee is paid in full413.
  5. Ask Planning & Zoning which structural inspections and building-code edition apply; we could not confirm either for ordinary rural construction.
  6. Obtain the final septic inspection and county record of the system location20.
  7. Obtain County Engineer approval for a driveway or field entrance connecting to a county road23. If access connects to an Iowa primary highway, obtain Iowa DOT approval before work begins24.
  8. Ask whether the ordinance requires an occupancy compliance certificate for the proposed project14.

What should you check before buying land in Harrison County?

Confirm the zoning district, setbacks, subdivision standards, and any Floodplain District F-1 designation before relying on a site plan1917. If the property has an existing septic system, ask Harrison County for an on-site evaluation before closing20. Iowa separately requires a time-of-transfer inspection for qualifying private septic systems22. Only 44.1% of county soils lack severe limits for a conventional drain field, so verify the actual homesite12. Harrison County requires permits for new and reconstructed private wells, plus on-site review and approval for new well construction11. A driveway or field entrance connecting to a county road requires approval from the County Engineer's Office23. About 79.1% of the county is at 15% slope or less, while 10% is wooded2526. Severe drought occurred in 14.9% of years, and average annual precipitation is 32.6 inches2728. The effective property-tax rate is about 1.3%, with a median annual bill of about $2,2142930.

Watch-outs

  • Harrison County, Iowa is not the same as other Harrison Counties in other states; confirm you're looking at the county seated in Logan, Iowa before relying on any office contact or link15.
  • A private sewage-disposal or private-water permit must be issued before Harrison County will issue the building permit for new construction using either system4.
  • Full-time RV occupancy, temporary camping, tiny-home occupancy, rural building inspections, and the locally adopted building-code edition remain unconfirmed; ask Harrison County Planning & Zoning before committing to a plan15.

Sources

  1. Environmental Health, Planning & Zoning, quoted and re-checked
  2. Environmental Health, Planning & Zoning, quoted and re-checked
  3. Environmental Health, Planning & Zoning, quoted and re-checked
  4. Environmental Health, Planning & Zoning, quoted and re-checked
  5. Environmental Health, Planning & Zoning - Harrison County, Iowa, quoted and re-checked
  6. Environmental Health, Planning & Zoning - Harrison County, Iowa, quoted and re-checked
  7. Iowa Code 2026, Chapter 91C — Construction Contractors (2026 county census)
  8. Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
  9. Iowa Code §335.30, Manufactured and modular homes (Iowa statewide rule), quoted and re-checked
  10. Senate File 2369 — Enrolled (Iowa statewide rule), quoted and re-checked
  11. Environmental Health, Planning & Zoning, quoted and re-checked
  12. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  13. Environmental Health, Planning & Zoning, quoted and re-checked
  14. Environmental Health, Planning & Zoning, quoted and re-checked
  15. Harrison County Environmental Health, Planning & Zoning (harrisoncounty.iowa.gov)
  16. Iowa Code 2026, Chapter 335 — County Zoning (Iowa statewide rule), quoted and re-checked
  17. Environmental Health, Planning & Zoning, quoted and re-checked
  18. Environmental Health, Planning & Zoning, quoted and re-checked
  19. Environmental Health, Planning & Zoning, quoted and re-checked
  20. Environmental Health, Planning & Zoning, quoted and re-checked
  21. Environmental Health, Planning & Zoning - Harrison County, Iowa, quoted and re-checked
  22. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  23. Engineer - Harrison County, Iowa, quoted and re-checked
  24. Access Management (Iowa statewide rule), quoted and re-checked
  25. Share of land at 15% slope or less: Bolthole Index county data
  26. Wooded share of land: Bolthole Index county data
  27. Share of years in severe drought: Bolthole Index county data
  28. Annual precipitation: Bolthole Index county data
  29. Effective property tax rate: Bolthole Index county data
  30. Median property tax bill: Bolthole Index county data

Written September 29, 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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County locator

Harrison County in Iowa

60
County map
Harrison County highlighted among the Iowa counties · colored by Index score

How Harrison County scores

Seclusion61100% ev.
Self-Sufficiency43100% ev.
Admin Boringness48100% ev.
Durability54100% ev.
Property Autonomy51100% ev.
Carry Cost60100% ev.

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

$232kTypical home
1.3%Property tax
$8,414Land / acre
32.6"Annual rain
14.9% of yrsSevere drought
7.7 / yr (+6.9)Mid-century 100°F days
19.4 daysMid-century dry spell
1.67" (+5.2%)Mid-century 1-day rain
1.65×Wildfire change factor
100%Forward climate coverage
$1,934Home insurance / yr
3.9% / yrInsurance growth
1.08%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
6,428People within 30 min
1,853,137People within 2 hr
14,570Radius comparison (15 mi)
21.1People / sq mi
1.1%Federal land
79.1%Land at 15% slope or less
44.1%Septic soil without severe limits
193,705 acWorkable land screen
10%Wooded land
43.6 tonsBiomass / forest ac
49.7°FAvg temp

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Answers from the rulebook for Harrison County

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

Harrison County rules

  • Building permitRequired

    Any new construction, reconstruction, or movement of a structure on property in rural Harrison County.

    • Harrison County Planning & Zoning issues, sites, reviews, and approves permits for rural areas.
    • For new construction using private sewage disposal or a private water supply, the applicable permit must be issued before the building permit.
    “Permits to build are required for any new construction, reconstruction, or movement of any structure on a piece of property. Harrison County Planning & Zoning issues, sites, reviews, and approves all permits for rural areas in Harrison County.”
    One more reviewed finding on this topic
    • Required — New construction, reconstruction, or movement of any structure in rural Harrison County.
      “Permits to build are required for any new construction, reconstruction, or movement of any structure on a piece of property.”
  • Certificate of occupancyLimited

    Occupancy compliance certificates under the county zoning ordinance.

    • The page states that the certificate is issued as required by the ordinance; it does not establish that one is required for every project.
    “The Zoning Administrator is directed to issue a building permit and/or occupancy compliance certificate as required by this ordinance”
    One more reviewed finding on this topic
    • Limited — Proposed construction, reconstruction, alteration, location, or use subject to the Harrison County zoning ordinance.
      “The Zoning Administrator is directed to issue a building permit and/or occupancy compliance certificate as required by this ordinance for proposed construction, reconstruction, alteration, location or use.”
  • County-wide zoningPresent (with conditions)

    County zoning and building regulation in rural, unincorporated Harrison County.

    • The county page states that the ordinance applies to zoning and building in Harrison County; the permit-issuance statement specifically covers rural areas.
    • Floodplain F-1 districts have additional special regulations.
    “All rural land inquiries should be made to the Planning and Zoning Department.”
    One more reviewed finding on this topic
    • Present (with conditions) — Rural and unincorporated areas of Harrison County administered by Harrison County Planning & Zoning.
      “All rural land inquiries should be made to the Planning and Zoning Department. [...] The Harrison County, Iowa Zoning Ordinance was adopted in February 1996 and provides the rules and procedures for zoning and building in Harrison County.”
  • Local zoningPresent (with conditions)

    County zoning for rural and unincorporated property.

    • Incorporated municipalities may have separate local rules; this claim is limited to the county-administered rural area.
    “The Harrison County, Iowa Zoning Ordinance was adopted in February 1996 and provides the rules and procedures for zoning and building in Harrison County.”
  • Zoning districtsPartial

    County zoning districts in unincorporated Harrison County.

    • The official county page identifies Floodplain District F-1 and states that special exceptions are listed in district regulations.
    • The complete district-by-district schedule was not extracted from the linked ordinance because the official document viewer was not text-accessible.
    “Special Exception uses are listed in the district regulations for each zoning district.”
    One more reviewed finding on this topic
  • Who permits septicCounty (with conditions)

    Private septic-system construction and rural septic evaluations in Harrison County.

    • The county describes state and county standards for site review.
    • Existing-system evaluations mentioned by the page are for compliance with public-health standards before purchase of rural property.
    “Homeowners interested in constructing a home away from a city sewer system may contact the Environmental Health Department for information regarding the licensing and inspection of septic system construction.”
  • Septic permitRequired

    New construction in rural Harrison County that will use private sewage disposal.

    • The private sewage-disposal permit must be issued before the building permit.
    • The county page also says site review must assure the location meets state and county standards.
    “Also, if your new construction will be using a private sewage disposal or water supply, you will need to have a permit issued before the building permit.”
  • Septic inspectionRequired

    New private septic construction in Harrison County.

    • Required inspections are site review, inspection during construction before covering any portion, and final inspection with a location diagram kept on file.
    • A pre-purchase on-site evaluation of an existing system is described as available on request, not universally required by the county page.
    “The following inspections are required for new construction:”
    One more reviewed finding on this topic
    • Required — New private septic-system construction in Harrison County.
      “The following inspections are required for new construction: Site review to assure your location meets state and county standards. During the construction process, prior to covering any portion of the system. Final inspection, the administrator will give your system a final inspection and will draw a diagram of its exact location to be kept on file in the department.”
  • Off-grid sanitationLimited

    New rural construction using private sewage disposal rather than city sewer service.

    • A private sewage-disposal permit must be issued before the building permit.
    • New septic construction is subject to required county inspections, including site review, construction-stage inspection before covering the system, and final inspection.
    “Also, if your new construction will be using a private sewage disposal or water supply, you will need to have a permit issued before the building permit.”
  • Well permitRequired

    New and reconstructed private wells in Harrison County.

    • The county page states that on-site review and approval is required for all new well construction.
    • The page does not state the fee or detailed application process.
    “Other services offered are well permits for new well construction & reconstructed wells”
    One more reviewed finding on this topic
    • Limited — New and reconstructed private wells in Harrison County.
      “Other services offered are well permits for new well construction & reconstructed wells and water well certification associated with property transfers. On–site review and approval is required for all new well construction.”
  • Subdividing landRegulated (with conditions)

    Subdivision applications in rural Harrison County.

    • The county page identifies subdivision regulations and states that the zoning commission reviews subdivision applications.
    • Detailed subdivision standards were not extracted because the linked ordinance document was not text-accessible.
    “The Commission serves in an advisory role to the Board, reviewing and making recommendations on implementation and updating the Harrison County Zoning Ordinance.”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Subdivision applications and rural land inquiries administered by Harrison County Planning & Zoning.
      “Information provided includes the zoning of a property, building setbacks, and subdivision regulations. All rural land inquiries should be made to the Planning and Zoning Department.”
  • Driveway accessRequired

    Driveways and field entrances connecting to Harrison County roads.

    • The County Engineer’s Office issues permits pertaining to roadway use and approves driveways and field entrances.
    “All permits pertaining to use of the roadway are issued from the office.”
  • Building in a floodplainLimited

    Development in county-designated Floodplain District F-1 areas.

    • The county states that certain areas are zoned F-1.
    • F-1 regulations are intended to minimize danger to life and property and protect the floodplain from encroachments or developments that would obstruct, contain, or divert flood waters.
    • The county page does not provide the complete F-1 permit standards.
    “Certain areas in Harrison County have been zoned as Floodplain Districts (F-1).”
    One more reviewed finding on this topic
    • Limited — Properties zoned Floodplain District (F-1) in Harrison County.
      “Certain areas in Harrison County have been zoned as Floodplain Districts (F-1). The F-1 district is designed and intended to be applied by the County to properties which lie within areas where special regulations are necessary in order to minimize the danger to life and property which results from flood waters.”
  • Permit feesVariable (with conditions)

    County zoning and building-permit applications in rural Harrison County.

    • A filing fee is charged for each application and no action is taken until the required fee is paid in full.
    • No fees are charged to the State of Iowa, the United States Government, or another political subdivision.
    • The county directs applicants to contact the Zoning Administrator for current fees.
    • A $100 appeal fee is stated for filing a Board of Adjustment appeal.

    Board of Adjustment appeal fee: 100 USD (Paid to the Administrator when the notice of appeal is filed.)

    “A filing fee shall be charged for each application to assist in deferring the cost of administrative review and legal publication.”
    One more reviewed finding on this topic
    • Variable (with conditions) — Planning and Zoning applications and permits in Harrison County.
      “A filing fee shall be charged for each application to assist in deferring the cost of administrative review and legal publication. [...] No action shall be taken on any application until the required fee is paid in full.”
  • Permit processPublished (with conditions)

    Rural Harrison County building and zoning permit process.

    • Applications are available from Planning & Zoning for new construction, remodeling, or repairs.
    • Private sewage-disposal or water-supply permits must precede the building permit when applicable.
    • A filing fee must be paid before action is taken.
    • Appeals must be filed within 30 working days after the final decision and include written reasons; the stated appeal fee is $100.

    appeal deadline: 30 working days (After the date of the final decision.) · appeal fee: 100 USD (Paid when the notice of appeal is filed.)

    “Permit to build applications for new construction, remodeling, or repairs are available from the Planning & Zoning Department.”
    One more reviewed finding on this topic
    • Published (with conditions) — Permit-to-build applications for new construction, remodeling, or repairs in rural Harrison County.
      “Permit to build applications for new construction, remodeling, or repairs are available from the Planning & Zoning Department. These forms contain information necessary to properly process your request.”

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.”
  • 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.”
  • 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.”
  • 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:”
  • 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.”

Still unanswered

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

  • Minimum dwelling size — Minimum dwelling size in rural Harrison County.
  • Minimum lot size — Minimum lot size in rural Harrison County.
  • Setbacks — Building setbacks under the Harrison County zoning ordinance.
  • Lot coverage — Lot-coverage requirements in rural Harrison County.
  • Building height — Building-height requirements in rural Harrison County.
6 more unanswered
  • Living in an RV
  • Camping on your land
  • Tiny homes
  • Mandatory utility hookup
  • Agricultural exemption
  • 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 Harrison County, Iowa

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

Harrison County scores 60/100 on the Bolthole Index, a solid county profile. Its strengths: sparse surroundings — about 6,428 people within a 30-minute drive and higher long-term carry cost.

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

Harrison County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Harrison County Environmental Health Department. 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 Harrison County, Iowa?

Land in Harrison County runs about $8,414 per acre, based on the latest county data.

What is the water situation in Harrison County?

Harrison County gets about 32.6" of rain a year, with severe drought in roughly 14.9% of years.

How remote is Harrison County?

A representative private-land location has about 6,428 people within a 30-minute drive and 1,853,137 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.

Off-grid gear

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

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How Harrison compares in Iowa

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