Monona County, IA: Owner-Builder Allowed

Unincorporated Monona County, Iowa requires an approved construction permit before new construction, an addition or moving a building onto a property¹. County zoning covers unincorporated land except specified federal, state and tribal land, while Environmental Health & Zoning handles private septic permits countywide^2,3.

At a glance

Building permit: Required for new construction, additions and moving a building onto property in unincorporated areas¹
Zoning: County zoning applies to unincorporated land; front yards run 35 to 100 feet by district²
Septic: County permit required; private systems may serve subdivisions where public sewer is not reasonably available^3,4
RV or tiny home: Occupancy rules were not confirmed; ask Environmental Health & Zoning before relying on either as housing⁵
Owner-builder: Own-property work is exempt from state contractor registration, not the county permit requirement^1,6
Private well: County permit required, including inside city limits; published fee is $150 and subject to change⁷
Floodplain: A separate permit is required before development in a county floodplain district⁸

Who to call

Building permits

Monona County Environmental Health & Zoning

Construction permits, zoning, floodplain permits, private wells and geothermal permits

712-433-3400

610 Iowa Ave. Onawa, IA 51040

Online permits →

Septic permits

Monona County Environmental Health & Zoning

Permits for new septic systems and renovation of soil-treatment systems

712-433-3400

610 Iowa Ave. Onawa, IA 51040

Online permits →

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 Monona County, Iowa?

Yes.

Yes. Unincorporated Monona County requires a building construction permit for new construction, additions and moving a building onto a property, and work may not start until the application is approved¹. A non-farm principal-structure permit costs $100, while qualifying farm construction on at least 40 acres is fee-exempt¹. Fees are published but subject to change⁷. The county requires a buildable-parcel designation and Chapter 100 compliance before issuing the permit¹. Applications use county forms and duplicate plans showing lot dimensions, building location, size, height and intended use⁴. The county's adoption of a general building code and its ordinary inspection requirements could not be confirmed; ask Environmental Health & Zoning what reviews and closeout steps apply⁵.

Building your own home does not remove the county permit: Iowa's exemption for people working on their own property applies to state contractor registration only, and it does not waive Monona County's construction-permit, zoning, septic or floodplain requirements⁶.

Who handles Monona County building permits, and how do you reach them?

Monona County Environmental Health & Zoning is the practical first stop for construction permits, zoning, private wells, septic systems and floodplain questions.

Monona County Environmental Health & Zoning is the practical first stop for construction permits, zoning, private wells, septic systems and floodplain questions⁵. The office is on the second floor of the courthouse at 610 Iowa Ave., Onawa, IA 51040, and its main phone number is 712-433-3400⁵. The county's Common Forms page publishes construction-permit materials along with variance, special-use, rezoning, subdivision, septic and floodplain forms⁵. Use that forms page to begin, then confirm the current fee because the published schedule is subject to change⁷. For an entrance onto an Iowa primary highway, the Iowa Department of Transportation district office administers the access-permit process and must approve the application before work begins⁹.

Does Monona County have zoning?

Yes.

Yes. Monona County zoning applies throughout unincorporated territory except land owned by the federal government, State of Iowa or Omaha Tribe of Nebraska; incorporated municipalities may administer their own land-use rules². The county publishes 10 base districts plus 3 overlays, including floodplain, airport and Loess Hills overlays, and structure-height limits vary by district². Minimum front-yard setbacks are 75 feet in the A-1, A-2 and R-1 districts, 35 feet in R-2, 50 feet in R-3, R-4, C-1 and C-2, 75 feet in M-1 and 100 feet in M-2, measured from the right-of-way line, and a new dwelling next to hazardous-material storage must sit at least 500 feet from any property line². Ask Environmental Health & Zoning to confirm the parcel's district, allowed use, height limit and any variance or special-use process before fixing a house location⁵. Iowa generally keeps qualifying agricultural land and structures primarily adapted to agricultural purposes outside county zoning while they remain in that use, but floodplain regulation may still apply¹⁰. Monona County requires approval before covered development in a floodplain district⁸.

How do septic permits work in Monona County?

Monona County Environmental Health & Zoning requires a permit for a new septic system or renovation of the soil-treatment portion of an existing system; a percolation test may be required.

Monona County Environmental Health & Zoning requires a permit for a new septic system or renovation of the soil-treatment portion of an existing system; a percolation test may be required³. The published fee is $150 for a new onsite wastewater permit and $75 for a repair permit, with a $100 penalty for installation without a permit³. In a subdivision where public sewer is not reasonably available, private sewer or septic facilities may be allowed if they meet County Board of Health requirements⁴. Contact the department before fixing the house location: only about 30.7% of mapped county soils are rated without severe limitations for a conventional drain field¹¹. A qualifying ownership transfer of a building served by a private sewage system requires a certified inspection before transfer, subject to statutory exceptions¹².

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

Monona County's rule for living in an RV on private land could not be confirmed, and neither could a general temporary-camping rule.

Monona County's rule for living in an RV on private land could not be confirmed, and neither could a general temporary-camping rule. Ask Environmental Health & Zoning about the parcel's zoning district, occupancy duration and sanitation before buying land for RV living^2,5. A county-specific tiny-home occupancy rule and a general minimum dwelling size also could not be confirmed². Iowa provides a clearer rule for a manufactured home: a county cannot reject a proposed residence solely because it is manufactured, but the home remains subject to the permanent-foundation, setback and minimum-square-footage standards applied to a site-built single-family dwelling on the same lot¹⁰. An off-grid wastewater plan is not permit-free: a new private septic system requires county approval^3,4.

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

Ask Environmental Health & Zoning to identify the zoning district, allowed use, height limit and buildable-parcel requirements.

Ask Environmental Health & Zoning to identify the zoning district, allowed use, height limit and buildable-parcel requirements^1,2.
If the parcel is being split, submit a division-of-land request; the Zoning Administrator provides the required method and procedures within 10 working days⁴.
Check for a floodplain district because covered development needs a separate permit⁸.
Plan the private well and septic system before fixing the house location; both require county permits^3,7.
Submit the construction application, duplicate site plans and current fee, then wait for approval before work starts^1,4.
Ask which inspections and occupancy documents apply because a general county rule could not be confirmed⁵.

What should you check before buying land in Monona County?

Confirm the zoning district, allowed use, setbacks, height limit and buildable-parcel status with Environmental Health & Zoning before relying on a listing description.

Confirm the zoning district, allowed use, setbacks, height limit and buildable-parcel status with Environmental Health & Zoning before relying on a listing description^1,2. Ask whether a recent parcel split complied with the county subdivision ordinance; divisions into 3 or more lots generally require a subdivision plat⁴. For a subdivision lot, confirm whether sanitary sewer connection is required or whether an approved private system is available⁴. Screen the site for floodplain limits and investigate soils early: about 30.7% of mapped soils lack severe limitations for a conventional drain field^8,11. Confirm road access with the proper authority; an entrance onto a state primary highway goes through an Iowa Department of Transportation district office⁹.

Watch-outs

Do not begin covered construction in unincorporated Monona County until the construction-permit application is approved¹.
A farm fee exemption does not erase floodplain review; Monona County's floodplain permit applies to covered development in a floodplain district^1,8.
Monona County's RV-living, temporary-camping, tiny-home and minimum-dwelling-size rules could not be confirmed; get a parcel-specific answer from Environmental Health & Zoning before buying for one of those uses⁵.
Monona County's setbacks depend on the zoning district and are larger next to livestock feeding operations, grain bins and rivers, so get the district and setbacks confirmed in writing before siting a house².

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 Monona County means bringing your own water and power. The kit we’d start with:

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Compared with neighboring counties

Like all 6 of its neighbors, Monona County has countywide zoning.

Rule	Monona County	Woodbury County	Harrison County	Crawford County	Ida County	Shelby County	Sac County
Building permit	Required	Required	Required	Required	Limited	Limited	Required
County zoning	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Septic permits	County Env. Health/Zoning	Siouxland District Health Dept.	County Env. Health Dept.	Carroll & Crawford County Env. Health Dept.	County Env. Health Sanitarian	County Env. Health Office	County Env. Health

Cities and towns in Monona 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: Castana · Mapleton · Moorhead · Onawa · Rodney · Turin · Whiting

Answers from the rulebook for Monona County

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

Monona County rules

Building permitRequired
New construction, additions, and moving a building onto property in unincorporated Monona County.
- No construction is to be started until permit applications are approved.
- A buildable parcel designation and Chapter 100 compliance are required before issuance.
- Private septic systems, private wells, and geothermal heat pump systems require a construction permit even inside city limits.
non-farm principal structure construction permit fee: 100 USD · farm 40+ acres construction permit fee: exempt
“building construction permit application is required”
Common Forms - Environmental Health/Zoning - Monona County ↗Re-checked Sep 26, 2026
County-wide zoningPresent
County zoning in unincorporated Monona County.
- The ordinance excludes lands owned by the United States, State of Iowa, or Omaha Tribe of Nebraska.
“The provisions of this Ordinance shall apply to all of the unincorporated territory of Monona County, Iowa with the exception of lands owned by the United States of America, State or Iowa, or Omaha Tribe of Nebraska.”
Chapter 100 Zoning Regulations ↗Re-checked Sep 26, 2026
Local zoningPresent
County-administered zoning in unincorporated Monona County; incorporated municipalities may administer their own land-use rules.
- The county ordinance applies to unincorporated territory and excludes specified government and tribal lands.
“The provisions of this Ordinance shall apply to all of the unincorporated territory of Monona County, Iowa with the exception of lands owned by the United States of America, State or Iowa, or Omaha Tribe of Nebraska.”
Chapter 100 Zoning Regulations ↗Re-checked Sep 26, 2026
Zoning districtsPublished
Published zoning districts and overlay districts for unincorporated Monona County.
- The ordinance lists ten base zoning classifications and overlay districts including floodplain, airport, and Loess Hills overlays.
- The official zoning map is part of the ordinance.
base zoning district classifications: 10 districts · overlay district classifications: 3 districts (The text separately lists four floodplain subdistricts under the floodplain overlay.)
“the unincorporated area of the County is hereby divided into ten (10) base zoning district classifications and three (3) overlay district as follows:”
Chapter 100 Zoning Regulations ↗Re-checked Sep 26, 2026
Minimum lot sizeDistrict specific (with conditions)
Lots subject to Chapter 100 in unincorporated Monona County, excluding lands owned by the United States, State of Iowa, or Omaha Tribe of Nebraska.
- The bulk requirements are minimum site-development requirements subject to modifications in §100.18.
- The schedule distinguishes an individual system, meaning the principal use has its own private wastewater treatment system and/or private water supply system, from a common system.
- A common system requires connection to both an approved public or private common wastewater treatment plant or lagoon and a rural water system or private common water supply system.
- Minimum requirements are based on net areas or distances exclusive of rights-of-way.
- The schedule lists, respectively by district, minimum lot areas for individual/common systems: A-1 2.0/3.0 acres; A-2 2.0/3.0 acres; R-1 2.0/0.25 acres; R-2 2.0/0.45 acres; R-3 2.0/3.0 acres; R-4 not applicable/5.0 acres; C-1 2.0 acres/none; C-2 2.0 acres/none; M-1 2.0 acres/none; and M-2 2.0 acres/none.
minimum lot area: district-specific (Varies by zoning district and by individual versus common water/wastewater system.)
“Minimum Lot Area (Acres) - Individual system(s) - Common systems 2.0 3.0 2.0 3.0 2.0 0.25 2.0 0.45 2.0 3.0 - 5.0 2.0 None 2.0 None 2.0 None 2.0 None”
Monona County Code of Ordinances, Chapter 100: Zoning Regulations ↗Re-checked Nov 13, 2026
SetbacksDistrict specific (with conditions)
Buildings and uses in the unincorporated territory of Monona County, Iowa, subject to the applicable A-1, A-2, R-1, R-2, R-3, R-4, C-1, C-2, M-1, or M-2 zoning district.
- The ordinance excludes lands owned by the United States of America, State of Iowa, or Omaha Tribe of Nebraska.
- Agricultural land, farm houses, farm barns, farm outbuildings, and other structures primarily adapted for agricultural purposes are exempt while so used, but restrictions concerning structures, buildings, dams, obstructions, deposits, or excavations in flood plains apply; the property owner must demonstrate agricultural use and the Zoning Administrator determines eligibility.
- The bulk regulations are minimum site-development requirements and are subject to modifications in Section 100.18.
- Minimum front-yard setbacks by district are A-1 75 feet, A-2 75 feet, R-1 75 feet, R-2 35 feet, R-3 50 feet, R-4 50 feet, C-1 50 feet, C-2 50 feet, M-1 75 feet, and M-2 100 feet.
- Front-yard depth is measured from the right-of-way line, whether the right-of-way line represents the property line or an easement line.
- All front, side, and rear yard setbacks for new dwellings adjacent to existing livestock feeding operations, including confinements and open feed lots, and from existing grain bins must comply with Section 100.09-3.
- Setbacks for all yards adjacent to rivers must meet the minimum yard requirements for the applicable zoning district.
- A new dwelling adjacent to property used for storage or use of hazardous materials may not be constructed closer than 500 feet to any property line; the Zoning Administrator determines whether materials are hazardous under Iowa Department of Public Health regulations and Chapter 100.
- For corner lots platted after the effective date of the ordinance, the street-side yard equals the applicable front-yard setback. Older corner lots follow the street-side regulation in place when recorded, subject to the ordinance's reverse-frontage and minimum-buildable-width rules.
- Double-frontage lots must provide the required front-yard depth on both street frontages.
- An approved subdivision plat's building line applies in place of another required yard line unless the chapter requires a greater setback.
- Accessory buildings must meet front-yard requirements, be at least four feet from alley lines and certain adjoining lot lines, conform to side-street setback rules on corner lots, and generally be at least ten feet from principal or other accessory buildings.
- The ordinance provides a variance process through the Board of Adjustment; special-use permits may also carry additional conditions.
- The ordinance is dated February 7, 2012 and states amendments dated October 5, 2021 and March 11, 2025; no effective date is assigned here because the source does not expressly identify those amendment dates as effective dates.
minimum front yard setback A-1: 75 feet (subject to Section 100.18 modifications) · minimum front yard setback A-2: 75 feet (subject to Section 100.18 modifications) · minimum front yard setback R-1: 75 feet (subject to Section 100.18 modifications) · minimum front yard setback R-2: 35 feet (subject to Section 100.18 modifications) · minimum front yard setback R-3: 50 feet (subject to Section 100.18 modifications) · minimum front yard setback R-4: 50 feet (subject to Section 100.18 modifications) · minimum front yard setback C-1: 50 feet (subject to Section 100.18 modifications) · minimum front yard setback C-2: 50 feet (subject to Section 100.18 modifications) · minimum front yard setback M-1: 75 feet (subject to Section 100.18 modifications) · minimum front yard setback M-2: 100 feet (subject to Section 100.18 modifications) · hazardous-material adjacent dwelling setback: >= 500 feet (new dwellings; measured to any property line; hazardous-material determination by the Zoning Administrator) · RV park space yards: 10-foot front, 5-foot side, and 5-foot rear yards (each RV space; minimum 10-foot separation between RVs)
“all of the unincorporated territory of Monona County, Iowa [...] Minimum Front Yard 75’ 75’ 75’ 35’ 50’ 50’ 50’ 50’ 75’ 100’”
Chapter 100 Zoning Regulations ↗Re-checked Oct 7, 2026
Building heightSpecified
Maximum principal and accessory structure heights by county zoning district.
- Height limits are district-specific.
- Special provisions may apply to public, semi-public, service buildings, hospitals, sanitariums, schools, churches, temples, airport overlays, and energy systems.
maximum principal-structure height: 35 to 45 depending on district feet (Some districts state None; the table also displays 75-foot entries for certain columns.) · maximum accessory-structure height: 16 feet (Some districts state None or 75-foot entries.)
“Maximum Height - Principal Structure - Accessory structure”
Chapter 100 Zoning Regulations ↗Re-checked Sep 26, 2026
Living in an RVTemporary only (with conditions)
Occupancy of recreational vehicles in recreational vehicle parks in unincorporated Monona County, excluding lands owned by the United States, State of Iowa, or Omaha Tribe of Nebraska.
- The rule applies to recreational vehicle parks and their accessory buildings.
- RV parking is temporary only and may not exceed six months during one calendar year.
- The park must provide an opaque evergreen landscape screen at least 10 feet wide and 20 feet high along all rear and side yards.
- Private streets must be at least 25 feet wide and have an approved pavement surface on the required site plan.
- Each RV space must be at least 20 feet by 55 feet, include one 9-foot-by-19-foot off-street parking stall, and meet the stated yards and separation requirements.
- This claim does not establish rules for an RV located outside an RV park.
maximum RV parking period: <= 6 months per calendar year (Applies to recreational vehicle parks.) · minimum RV space width: >= 20 feet (Applies to each RV space in an RV park.) · minimum RV space length: >= 55 feet (Applies to each RV space in an RV park.) · minimum RV-to-RV separation: >= 10 feet (Applies in an RV park.)
“Recreational Vehicle Parks and their accessory buildings shall be designed for temporary parking of RV’s only, said recreational vehicles shall be parked in the park for a period not to exceed six (6) months during any one (1) calendar year.”
Monona County Code of Ordinances, Chapter 100: Zoning Regulations ↗Re-checked Nov 13, 2026
Who permits septicCounty
Private onsite wastewater permitting administered by Monona County Environmental Health/Zoning.
- The county page identifies Environmental Health/Zoning as the permitting source; individual systems remain subject to applicable Iowa requirements.
“required from Environmental Health/Zoning”
Private Water Wells & Onsite Septic Systems ↗Re-checked Sep 26, 2026
Septic permitRequired
A new septic system or renovation of the soil-treatment portion of an existing system.
- A percolation test may be required.
- The percolation-test results provide information used by Environmental Health/Zoning to issue the permit.
- The listed repair-permit fee is $75, with a $100 penalty added for installation without a permit.
new onsite wastewater permit fee: 150 USD · repair permit fee: 75 USD ($100 penalty added for installing without a permit)
“Permits for a new septic system or to renovate the soil treatment part of an existing septic system are required from Environmental Health/Zoning.”
Private Water Wells & Onsite Septic Systems ↗Re-checked Sep 26, 2026
Off-grid sanitationLimited
Private sewer facilities, septic tanks, and private sewage treatment systems in subdivisions where public sewer is not reasonably available.
- Private facilities must meet County Board of Health requirements.
- A proposed private sewage treatment system requires evidence of Iowa DNR approval in the subdivision context.
- County septic permits are required for new systems and specified renovations.
“private sewer facilities or septic tanks”
Chapter 200 Division of Land and Subdivision Regulations ↗Re-checked Sep 26, 2026
Well permitRequired
Private water wells in Monona County.
- Private wells also require a construction permit even inside city limits.
- The county fee page states that fees are subject to change.
private well water permit application fee: 150 USD
“Private Well Water Permit Application: $150.00”
Common Forms - Environmental Health/Zoning - Monona County ↗Re-checked Sep 26, 2026
Mandatory utility hookupConditional
Subdivision improvements and lots in unincorporated Monona County.
- Subdivision sanitary-sewer connections are required where applicable.
- Where existing sewer outlets are not within reasonable distance, private sewer facilities or septic tanks may be permissible if they meet County Board of Health requirements.
- Private water supply systems may be proposed with Iowa DNR approval; private wells must meet County Board of Health requirements.
“connection for each lot to the sanitary sewer”
Chapter 200 Division of Land and Subdivision Regulations ↗Re-checked Sep 26, 2026
Subdividing landRegulated (with conditions)
Division and subdivision of land in unincorporated Monona County.
- Agricultural divisions over 40 acres along established aliquot lines may be exempt if they involve no new road, street, easement, or dedication.
- A division of three or more lots generally requires a subdivision plat.
- Incorporated-city land divisions are reviewed by the appropriate city.
agricultural division exemption threshold: > 40 acres (Must be for agricultural purposes, along established aliquot lines, and involve no new road, street, easement, or dedication.)
“Land that is divided into two or more lots or parcels of less than an aliquot part shall be subject to the procedures and requirements prescribed in this Ordinance including specific quantity descriptions, plats of survey, minor subdivision plats and major subdivision plats as applicable by this Ordinance and state law.”
Chapter 200 Division of Land and Subdivision Regulations ↗Re-checked Sep 26, 2026
Building in a floodplainRequired
Floodplain development in Monona County floodplain districts.
- The permit is required before any man-made change to improved or unimproved real estate, including buildings, structures, mining, filling, grading, paving, storage, excavation, drilling, and placement of factory-built homes.
- Before use or occupancy, the applicant must submit appropriate professional certification that required flood-protection measures comply.
- Routine maintenance listed in the ordinance does not trigger a building permit.
“secured prior to any floodplain development”
Monona County Floodplain Management Ordinance ↗Re-checked Sep 26, 2026
Permit feesPublished
Published Monona County zoning, construction, subdivision, well, and onsite wastewater application fees.
- Fees are subject to change.
- Written requests and postage conditions apply to permit copies.
non-farm principal structure construction permit fee: 100 USD · plat of survey fee: 25 USD · minor subdivision fee: 25 USD · preliminary plat fee: 50 USD · final plat fee: 50 USD · private well permit fee: 150 USD · onsite wastewater permit fee: 150 USD
“Fees are subject to change. Zoning Permit Application Fees”
Permit Application Fees ↗Re-checked Sep 26, 2026
Permit processPublished
County zoning/building permit process and subdivision land-division process.
- Building-permit applications use approved forms and duplicate plans showing lot dimensions, building location, size, height, and intended use.
- Subdivision applicants submit a division-of-land request; the Zoning Administrator routes it to county offices and provides the required method and procedures within ten working days.
- A percolation test may be required for septic permitting.
division-of-land response time: 10 working days
“Within ten (10) working days, the Zoning Administrator will notify the applicant of the required method, procedures and requirements for the proposed division of land.”
Common Forms - Environmental Health/Zoning - Monona County ↗Re-checked Sep 26, 2026

Iowa rules that apply here

Owner-builder exemptionAvailable
Whether an individual performing construction work on the individual's own property is a contractor subject to Iowa Code chapter 91C contractor-registration requirements, including in Monona County.
- The exemption applies for purposes of Iowa Code chapter 91C.
- A person who earns less than two thousand dollars annually is also excluded from the chapter's contractor definition.
- This state contractor-registration exemption does not waive Monona County construction-permit requirements or other zoning, septic, floodplain, or applicable construction requirements.
annual earnings threshold: < 2000 USD (The separate own-property-work exclusion applies regardless of this threshold.)
“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 § 91C.1 — Definition — exemption — combined registration and licensing process ↗Re-checked Oct 5, 2026
One more reviewed finding on this topic
- Available (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.
  “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
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
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
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
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.

Camping on your land — Temporary camping on private land.
Tiny homes — Tiny-home occupancy.
Driveway access — Driveway access requirements for individual development.
Short-term rentals — Short-term rental use of residential property.

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 Monona County, Iowa

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

Monona County scores 60/100 on the Bolthole Index, a solid county profile. Its strengths: manageable long-term carry cost and sparse surroundings — about 9,207 people within a 30-minute drive. Watch-outs: workable self-sufficiency basics (30.9″/yr rainfall).

How much does land cost in Monona County, Iowa?

Land in Monona County runs about $8,044 per acre, based on the latest county data.

What is the water situation in Monona County?

Monona County gets about 30.9" of rain a year, with severe drought in roughly 17.4% of years.

How remote is Monona County?

A representative private-land location has about 9,207 people within a 30-minute drive and 1,805,572 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 land rules in Monona County, Iowa