Bolthole Index

Johnson County, Iowa

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

52Index Score / 100
#59 of 99 in Iowa

Johnson County, Iowa requires building permits for new buildings, additions, residential work, renovations, building systems and demolition in county-administered areas, with limited exemptions for small detached accessory structures and qualifying decks1. The county zones land outside its cities, and requirements vary among its published zoning districts23. Johnson County Public Health must approve sewage disposal before PDS can issue a building permit45.

At a glance

Building permit
Required in county-administered areas; limited exemptions include qualifying small accessory structures and decks1
Zoning
Yes, outside cities; permitted uses and dimensional rules vary by district23
Septic
Public Health approval is required before PDS can issue a building permit45
Owner-builder
Working on your own property exempts you from IA contractor registration, not from permits or inspections6
Manufactured homes
Allowed; must meet the same foundation, setback and size standards as a site-built home7
Accessory dwelling unit
County must allow at least one ADU per single-family lot, up to 1,000 sq ft or 50% of the house8
Septic at resale
Time-of-transfer inspection required before an ownership transfer; valid 2 years9

Who to call

Building permits

Planning, Development and Sustainability (PDS) - Building Services

Building permits and inspections for unincorporated Johnson County (fax 319-356-6084)

319-356-6085

Johnson County Administration Building, 913 S Dubuque Street, Iowa City, IA 52240-4281

Zoning

Planning, Development and Sustainability (PDS) - Planning and Development

Zoning administration and the Unified Development Ordinance for unincorporated Johnson County

319-356-6083

Johnson County Administration Building, 913 S Dubuque Street, Iowa City, IA 52240-4281

Septic permits

Johnson County Public Health

Septic (private sewage) and private well permits for unincorporated Johnson County

319-356-6040

855 S Dubuque Street, Iowa City, IA 52240

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 Johnson County, Iowa?

Yes. Johnson County requires permits for new buildings, additions, residential work, renovations, building systems and demolition in county-administered areas1. A detached one-story accessory structure of 200 square feet or less may be exempt when used as a tool shed, storage shed, playhouse or similar use; a deck may also be exempt when it is no larger than 200 square feet, no more than 30 inches above grade, unattached to the dwelling and does not serve the main exit door1. Work must begin within 180 days after permit issuance and cannot be suspended or abandoned for more than 180 days unless the county grants a written extension1. If you do the work yourself, Iowa does not treat you as a contractor requiring chapter 91C registration for work on your own property, but that exemption does not waive Johnson County's permits or inspections6.

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

Planning, Development and Sustainability (PDS) is Johnson County's building department; its Building Services division issues permits and schedules inspections for unincorporated Johnson County10. Reach Building Services at 319-356-6085 (fax 319-356-6084), at the Johnson County Administration Building, 913 S Dubuque Street, Iowa City, IA 52240-4281, Monday through Friday, 8:00 a.m. to 4:30 p.m.10. The same PDS department's Planning and Development division handles zoning, at 319-356-6083, from the same address11. Johnson County Public Health separately administers sewage permitting and is the office to ask about private-well requirements, at 855 S Dubuque Street, Iowa City, IA 52240, phone 319-356-6040412.

Does Johnson County have zoning?

Yes. Johnson County has zoning responsibility outside its cities, so the county rules described here apply to unincorporated parcels rather than property inside city limits2. The Unified Development Ordinance publishes 27 districts covering agricultural, residential, commercial, industrial, preservation and specialized uses; allowed uses and dimensional requirements vary by district3. Iowa law generally exempts agricultural land, farmhouses, farm barns and other structures primarily used for farming from county zoning while they remain in that use13. Iowa also requires counties to allow at least one accessory dwelling unit on a single-family lot where a single-family residence is an allowed principal use, subject to a limit of 1,000 square feet or 50% of the main house, whichever is larger8. Ask PDS to identify the parcel's district, permitted use and dimensional rules before designing or buying11.

How do septic permits work in Johnson County?

Johnson County Public Health administers private sewage disposal and wastewater permitting4. New development needs a sewage permit, the parcel must be tested for treatment suitability, and PDS cannot issue the building permit until Public Health approves the sewage disposal system; approval can take up to 2 weeks5. If you are buying a property with an existing septic system serving 1 to 4 dwelling units, Iowa generally requires a time-of-transfer inspection before the deed can be recorded; the tank must be opened and pumped unless a licensed cleaner pumped it within the previous 3 years, and the inspection is valid for 2 years9. Only 0.4% of Johnson County soils are rated without severe limits for a conventional drain field, so make septic suitability an early contingency rather than assuming a standard system will fit14. Public Health also handles private-well inquiries, but we could not confirm a general well-permit rule; ask the office about the parcel12.

Can you put a manufactured home or accessory dwelling on your land in Johnson County?

Yes to both, with conditions. Iowa law bars a county from rejecting a manufactured home's plans just because it's manufactured, but the home must meet the same permanent-foundation, setback, and minimum-square-footage standards as a site-built house on the same lot, and it must be assessed and taxed as a site-built dwelling7. Outside a manufactured home community, Johnson County can require the foundation to look visually compatible with nearby homes, and state law caps any mandated width standard at 24 feet if the home otherwise meets federal manufactured-housing standards7. Separately, Iowa requires the county to allow at least one accessory dwelling unit on a lot with a single-family home in any zoning district where that's an allowed use, capped at 1,000 square feet or half the size of the main house, whichever is larger; a manufactured or mobile home used as that ADU must go on a permanent foundation and be taxed as real estate8. We found no official Johnson County statement in the sources reviewed this session about long-term RV living on a rural parcel outside a campground, so confirm current rules with PDS before moving a camper onto your land11.

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

  1. Confirm your parcel's zoning district, setbacks, permitted use and any agricultural exemption with PDS's Planning and Development division before you buy or design2311.
  2. Contact Johnson County Public Health early about septic feasibility; only 0.4% of county soils are rated free of severe limits for a conventional drain field1412.
  3. Obtain Public Health's sewage approval before seeking the building permit, and ask the office what private-well requirements apply because we could not confirm a general rule512.
  4. Submit building plans to PDS Building Services; limited permit exemptions apply to qualifying small accessory structures and decks110.
  5. If you are doing the work yourself, Iowa's chapter 91C contractor-registration exemption for work on your own property covers your labor, not the county's permit or inspection requirements6.
  6. If the driveway connects to an Iowa primary highway, apply through the Iowa DOT district office before work begins15.
  7. Before closing on a home with an existing septic system, confirm the required time-of-transfer inspection; it is valid for 2 years9.

What to check before you buy land in Johnson County

Johnson County sits about 17 miles from the nearest large city and has a population density of about 257 people per square mile, making it one of the more built-up counties in this guide's coverage1617. About 88.7% of the county's land sits at 15% slope or less, so most parcels are easy to build and drive on, but only 16.4% is wooded -- this is Iowa row-crop country, and privacy or windbreak cover may take planting, not buying1819. Soils are a serious constraint for septic: just 0.4% are rated without severe limits for a conventional drain field, so budget for a site evaluation and likely an alternative system on most lots14. Typical home values run around $313,517, and the effective property tax rate is about 1.6% for a median annual bill near $4,587, one of the higher tax bills in this guide's coverage202122. Farmland here has recently sold for around $10,307 an acre on average, reflecting Johnson County's strong row-crop ground23. Confirm zoning, septic feasibility and any time-of-transfer inspection status with the relevant office before you close11.

Watch-outs

  • Soils in Johnson County rate only 0.4% free of severe limits for a conventional septic drain field, one of the lowest shares in this guide's coverage, so a standard trench system is unlikely to work on most parcels14.
  • If you're buying a home with an existing septic system, Iowa requires a time-of-transfer inspection before the deed can be recorded; don't assume a system is compliant just because it's currently working9.
  • We found no official Johnson County statement addressing long-term RV living on private rural land outside a campground; confirm with PDS before assuming it's allowed11.

Sources

  1. Building Permits FAQ, quoted and re-checked
  2. Johnson County Unified Development Ordinance, Official Version, quoted and re-checked
  3. Johnson County Unified Development Ordinance, Official Version, quoted and re-checked
  4. Sewage Permit Application, quoted and re-checked
  5. Sewage Permit Application, quoted and re-checked
  6. Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
  7. Iowa Code §335.30, Manufactured and modular homes (Iowa statewide rule), quoted and re-checked
  8. Senate File 2369 — Enrolled (Iowa statewide rule), quoted and re-checked
  9. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  10. Planning, Development and Sustainability (PDS) - Building Services (johnsoncountyiowa.gov)
  11. Planning, Development and Sustainability (PDS) - Planning and Development (johnsoncountyiowa.gov)
  12. Johnson County Public Health (johnsoncountyiowa.gov)
  13. Iowa Code 2026, Chapter 335 — County Zoning (Iowa statewide rule), quoted and re-checked
  14. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  15. Access Management (Iowa statewide rule), quoted and re-checked
  16. Distance to the nearest metro area: Bolthole Index county data
  17. Population density: Bolthole Index county data
  18. Share of land at 15% slope or less: Bolthole Index county data
  19. Wooded share of land: Bolthole Index county data
  20. Typical home value (Zillow): Bolthole Index county data
  21. Effective property tax rate: Bolthole Index county data
  22. Median property tax bill: Bolthole Index county data
  23. Farmland value per acre (USDA census): 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.

Found land here? Start a Property Hunt →

County locator

Johnson County in Iowa

52
County map
Johnson County highlighted among the Iowa counties · colored by Index score

How Johnson County scores

Seclusion30100% ev.
Self-Sufficiency51100% ev.
Admin Boringness48100% ev.
Durability54100% ev.
Property Autonomy51100% ev.
Carry Cost54100% 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 →

$314kTypical home
1.6%Property tax
$10,307Land / acre
37.4"Annual rain
11.2% of yrsSevere drought
6 / yr (+5.5)Mid-century 100°F days
15.3 daysMid-century dry spell
1.93" (+8%)Mid-century 1-day rain
1.8×Wildfire change factor
100%Forward climate coverage
$1,526Home insurance / yr
2.7% / yrInsurance growth
0.87%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
136,810People within 30 min
2,372,660People within 2 hr
142,989Radius comparison (15 mi)
257People / sq mi
8%Federal land
88.7%Land at 15% slope or less
0.4%Septic soil without severe limits
1,338 acWorkable land screen
16.4%Wooded land
34.1 tonsBiomass / forest ac
49.3°FAvg temp

Scout Johnson County

Camp here before you commitBook a few nights nearby on Hipcamp →Already own land here?Earn money hosting campers — get $100 when you become a Hipcamp host →

Some links are affiliate or referral links — we may earn a commission, at no cost to you.

Property hunt

Find land. Bring the promising ones back.

Search live inventory elsewhere, then cost and vet each candidate here. No copied listings, account, or paid data feed.

View your full hunt →
ZillowLand & lotsRealtor.comLand listingsLandSearchRural & vacant land

Each button opens a current land search for Johnson County. Listing sites control their own results and filters.

Analyze a property
Add setup-cost allowances

Use rough quotes or placeholders. Blank fields count as $0.

Working estimate

—land + entered setup costs
Asking $ / acre
—
Setup allowance
—
All-in $ / acre
—

A planning estimate, not a valuation or contractor quote. The USDA benchmark includes farm land and buildings; it is context, not a parcel comp.

Before an offer

Parcel due diligence

0/8 checked

Saved properties and checklist progress stay on this device. Bolthole Index does not receive them.

Answers from the rulebook for Johnson County

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

Johnson County rules

  • Building permitRequired

    New buildings, additions, residential work, renovations, building systems, and demolition in county-administered areas.

    • A detached one-story accessory structure of 200 square feet or less may be exempt if used as a tool shed, storage shed, playhouse, or similar use.
    • Decks not exceeding 200 square feet, not more than 30 inches above grade, unattached to a dwelling, and not serving the main exit door are exempt.
    • Window replacement may be exempt when headers are not moved, altered, or replaced, subject to the stated emergency-escape conditions.
    • Permits must begin work within 180 days of issuance; work may not be suspended or abandoned for more than 180 days, subject to written extensions and additional renewal fees.

    detached accessory structure exemption area: <= 200 square feet (one-story accessory structure used as a tool shed, storage shed, playhouse, or similar use) · deck exemption area: <= 200 square feet (also must be no more than 30 inches above grade, unattached to a dwelling, and not serve the main exit door) · permit commencement deadline: 180 days (extensions may be granted for 180-day periods)

    “Permits are usually required for the following:”
  • County-wide zoningPresent (with conditions)

    Johnson County zoning regulation in unincorporated areas.

    • The UDO applies to the unincorporated areas of Johnson County.
    • Agricultural operations and qualifying agricultural structures may be exempt under Iowa Code section 335.2 and UDO section 8:1.3.
    “The County has zoning responsibility in all areas except within the cities.”
  • Zoning districtsPublished

    Published zoning districts and boundaries in the Johnson County UDO for unincorporated areas.

    • The UDO identifies agricultural, residential, conservation, manufactured-housing, recreation, commercial, industrial, solid-waste, renewable-energy, environmental-resource-preservation, and public districts.
    • Specific uses and dimensional requirements vary by district.
    “There are 27 individual zoning districts, which can be generally grouped into Ag, Residential, Commercial, Industrial, Preservation, and other specialized, public, or institutional uses:”
  • Who permits septicCounty (with conditions)

    Private sewage disposal and wastewater permitting in Johnson County.

    • Johnson County Public Health administers the county wastewater and septic process.
    • The county regulations refer to an administrative authority and Board of Health requirements.
    “The Johnson County Public Health Department requires that any new development be issued a sewage (wastewater) permit.”
  • Septic permitRequired

    New development and installation of private sewage disposal systems.

    • A building permit cannot be issued until Health Department approval for a sewage disposal system is received.
    • The parcel must be tested for suitability for waste treatment.
    • Permit approval can take up to two weeks.
    • Applications must include applicable fees.

    approval time: <= 2 weeks

    “No private sewage disposal system shall be installed as described in 3.03 unless a construction permit issued by the administrative authority has been obtained.”

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.”
  • 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.”
  • 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:”
  • 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.”
  • 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”
  • Permit processPartial

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

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

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

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

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 unincorporated Johnson County.
  • Lot coverage — Lot coverage limits in unincorporated Johnson County zoning districts.
  • Tiny homes — Tiny-home occupancy in unincorporated Johnson County.
  • Off-grid sanitation — Alternative or off-grid sanitation systems.
  • Well permit — Private well permits.
1 more unanswered
  • Mandatory utility hookup

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.

Water rights & wells in Johnson County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Iowa’s water agency.

Managed area

Groundwater is actively managed here, but a small household well is generally still available.

Household wellExempt — no permit or water right

Regulated-riparian permit system (Iowa Code 455B); household wells below 25,000 gpd are exempt. EXCEPTION: within designated Jordan-aquifer 'protected water source' areas (IAC 567-53.7) a new private well drilled into/through the Jordan aquifer needs Iowa DNR approval.

Limit: water-use permit only above 25,000 gpd; Jordan-aquifer protected areas need DNR approval

Iowa Admin. Code 567 ch. 50-53 / Iowa Code 455B ↗
  • Cambrian-Ordovician (Jordan) Aquifer Protected Water Sourceslocalized of county

    Under IAC 567-53.7, within the Jordan-aquifer protected areas (parts of Johnson/Linn; a separate one in Webster) the county cannot permit a private well drilled into or through the Jordan aquifer without Iowa DNR approval, which may require public-supply well standards or deny new Jordan wells to preserve head. Unlike most of the state, domestic wells reaching the Jordan here are NOT automatically exempt.

    Iowa Admin. Code 567-53.7 — Protected Water Sources ↗

Regulated-riparian state (large uses permitted). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Iowa state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Johnson County, Iowa

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

Johnson County scores 52/100 on the Bolthole Index, a solid county profile. Watch-outs: about 136,810 people within a 30-minute drive.

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

Johnson County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Johnson County Public 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 Johnson County, Iowa?

Land in Johnson County runs about $10,307 per acre, based on the latest county data.

What is the water situation in Johnson County?

Johnson County gets about 37.4" of rain a year, with severe drought in roughly 11.2% of years. On water rights, Johnson County lies in the Cambrian-Ordovician (Jordan) Aquifer Protected Water Sources — Under IAC 567-53.7, within the Jordan-aquifer protected areas (parts of Johnson/Linn; a separate one in Webster) the county cannot permit a private well drilled into or through the Jordan aquifer without Iowa DNR approval, which may require public-supply well standards or deny new Jordan wells to preserve head. Unlike most of the state, domestic wells reaching the Jordan here are NOT automatically exempt..

How remote is Johnson County?

A representative private-land location has about 136,810 people within a 30-minute drive and 2,372,660 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 Johnson County means bringing your own water and power. The kit we’d start with:

These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.

How Johnson compares in Iowa

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