Bolthole Index

Marshall County, Iowa

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

47Index Score / 100
#87 of 99 in Iowa

Unincorporated Marshall County, Iowa requires a building permit for most construction, and the county zones all unincorporated land. Structures of 120 square feet or less are exempt from the building-permit requirement, but parcel-specific zoning, floodplain and platting rules can still matter.12

At a glance

Building permit
Required for most construction; structures of 120 square feet or less are exempt1
Zoning
All unincorporated land is county-zoned2
Septic
Regulated by Marshall County Environmental Health under county and state rules34
RV living
A special-use permit is required beyond 90 days in any 365-day period5
Tiny home
No specific county tiny-home rule was confirmed; zoning-district standards still apply6
Owner-builder
Own-property work is exempt from state contractor registration, not from county permits7
Private well
A new dwelling needs its well permit before the building permit8

Who to call

Planning & zoning

Marshall County Planning & Zoning

County planning, zoning, building-permit and floodplain questions for unincorporated Marshall County

641-844-2707 (Office)

tkelley@marshallcountyia.gov

Courthouse 1 E. Main St., Suite 140 Marshalltown, IA 50158

Septic permits

Marshall County Environmental Health

Environmental-health regulation, septic systems and private wells

641-844-2707 (Office)

tkelley@marshallcountyia.gov

Courthouse 1 E. Main St., Suite 140 Marshalltown, IA 50158

Roads & driveways

Marshall County Engineer & Secondary Roads

Entrance and driveway permits for access from county right-of-way

1 E. Main St. Marshalltown, IA 50158

Contact details are copied from each office’s official page and were checked against it on October 7, 2026.

Off-grid gear

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

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

Yes. In unincorporated Marshall County, excavating for, erecting, constructing, reconstructing, enlarging, altering or moving a building or structure requires a building permit from the Zoning Administrator.1 A structure of 120 square feet or less does not need that building permit.1 Applications require duplicate plans, site and lot information, the intended use, staking before construction and the required fee; the county reviews them for zoning, floodplain and platting compliance.9

Marshall County publishes a value-based fee schedule: work valued from $0 through $10,000 is charged 3% of value, while work valued at $10,001 or more is charged $300 plus 0.2% of total value.10 We could not confirm the residential building code, inspection schedule or certificate-of-occupancy process for county permits; ask Marshall County Planning & Zoning what plans, inspections and closeout apply before ordering materials.11

Who issues building permits in Marshall County, Iowa?

Marshall County Planning & Zoning is the first stop for building permits and land-use questions on unincorporated property; the office assists with land-use policy and regulatory enforcement.11 The office is in the Marshall County Courthouse at 1 E. Main St., Suite 140, Marshalltown, IA 50158, and its office phone is 641-844-2707.11

Permit administration is split by subject. Marshall County Environmental Health handles county septic and private-well matters, while Engineer & Secondary Roads requires a permit for a driveway or entrance coming from county right-of-way.1213 A project in a Special Flood Hazard Area or floodplain also requires a floodplain development permit and may require state and federal permits.14 The applicant for a county building permit must be the owner, contract buyer of record or an agent authorized in writing.9

Does Marshall County, Iowa have zoning?

All of unincorporated Marshall County is zoned, and permits are required for most structures, including dwellings, pole buildings, decks and signs.15 Incorporated cities are outside the county ordinance's territory, so a parcel inside city limits needs an answer from that city rather than the county.2

The county ordinance uses multiple districts with different permitted uses and dimensional schedules.6 Lots cannot be divided below the applicable district's minimum width and area unless the Board of Adjustment permits it or the land is added to another parcel to meet the ordinance.16 Setback treatment also depends on the parcel; for example, the front-yard setback applies along both street sides of a corner lot platted after the ordinance took effect.17 Ask Planning & Zoning to confirm the parcel's district, permitted use, lot dimensions, setbacks, floodplain status and any special-use process before designing a site plan.11

How do septic permits work in Marshall County, Iowa?

Marshall County Environmental Health is the local authority for private sewage systems serving 4 homes or fewer or fewer than 15 people, and a county septic permit is required under county requirements and Iowa's siting, construction and permitting rules.1218 Iowa DNR sets minimum standards and has primary responsibility for larger public systems.19

Off-grid living does not create a wastewater exception: when public sewer is unavailable, a building where people live, gather or work must have an approved private sewage system, and wastewater cannot be discharged to a ditch, waterway, the ground, groundwater, an abandoned well, an agricultural drainage well or a sinkhole.20 Only 4.9% of Marshall County soils are rated without severe limitations for a conventional septic drain field, so make the site evaluation an early contingency rather than assuming a standard field will fit.21 A private system serving a building must generally be inspected before a qualifying ownership transfer, and the statewide rule includes exceptions and a binding-agreement process when temporary conditions prevent inspection.22 Contact Environmental Health at 641-844-2707 before closing or fixing a house location to confirm the permit application, soil analysis and transfer paperwork.23

Can you live in an RV or tiny home in Marshall County, Iowa?

In unincorporated Marshall County, an RV, fifth-wheel trailer or camper used as a habitation for more than 90 days in any 365-day period requires a special-use permit.5 The county materials reviewed do not establish a separate general temporary-camping rule, so ask Planning & Zoning how shorter stays, utilities and active construction affect the parcel.11

Marshall County has no confirmed rule written specifically for tiny homes. A small dwelling still has to fit the parcel's zoning district and applicable dwelling standards; in the R-3 example, a one-story dwelling needs at least 1,000 square feet of ground-floor area and a two-story dwelling needs at least 800 square feet, excluding open porches, garages and steps.24 Manufactured homes are allowed in the A-1 agricultural district when placed on a permanent foundation, converted to real property and taxed as a site-built dwelling.25

Building a home in Marshall County, Iowa: what are the steps?

  1. Confirm that the parcel is outside city limits, then ask Marshall County Planning & Zoning for its district, allowed residential use, setbacks, floodplain status and platting constraints.1511
  2. If land will be divided, resolve subdivision approval and required improvements before relying on a new lot as buildable.26
  3. Confirm legal access; if the entrance comes from county right-of-way, file the driveway permit with Engineer & Secondary Roads.2713
  4. Apply to Environmental Health for the required septic permit and establish whether the site can support the proposed system.18
  5. Resolve utilities: private sewage disposal is prohibited where public sewer is available or connection is locally required; if a private well will serve a new dwelling, its permit must precede the building permit.288
  6. If the site is in a floodplain, obtain the floodplain development permit and any required state or federal approvals.14
  7. Submit duplicate plans, site information, intended use, staking and the fee to Planning & Zoning before excavation or construction.9

What should you check before buying land in Marshall County, Iowa?

Start with jurisdiction and zoning: confirm whether the parcel is unincorporated, identify its county zoning district, and verify that the intended dwelling and accessory uses are allowed.2 Check recorded access as carefully as physical access because the county requires qualifying road frontage or a qualifying private easement for a residential lot.27 If the tract will be split, confirm subdivision approval and improvement obligations before closing.26

Budget for soils and wastewater before treating a site as buildable; only 4.9% of county soils rate without severe limitations for a conventional drain field.21 An off-grid plan still needs an approved private sewage system when public sewer is unavailable.20 Check public-water availability because private sewage disposal is prohibited where public sewer is available or a local ordinance requires connection, and a private well permit will not be issued where community or public water is available.288 A floodplain site requires a county development permit and may need state and federal permits.14 For cost context, the effective property-tax rate is 1.5% and the median annual bill is $2,030.2930

Watch-outs

  • The county's published permit requirement applies to unincorporated Marshall County; incorporated cities may use separate local rules.2
  • An owner working on the owner's own property is exempt from Iowa contractor registration, but that exemption does not waive county permits or other applicable approvals.7
  • A new private well serving a dwelling must be permitted before Marshall County issues the building permit.8
  • The county materials reviewed do not confirm residential building inspections or a certificate-of-occupancy process; ask Planning & Zoning what closeout applies before construction starts.11

Sources

  1. Marshall County Zoning Ordinance and Platting/Subdivision Ordinance, quoted and re-checked
  2. Zoning Applications & Permits, quoted and re-checked
  3. Private Sewage Disposal and Septage (2026 county census)
  4. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  5. Marshall County Zoning Ordinance and Platting/Subdivision Ordinance, quoted and re-checked
  6. Zoning Ordinances, quoted and re-checked
  7. Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
  8. Wells, quoted and re-checked
  9. Marshall County Zoning Ordinance and Platting/Subdivision Ordinance, quoted and re-checked
  10. Zoning Applications & Permits, quoted and re-checked
  11. Marshall County Planning & Zoning (marshallcountyia.gov)
  12. Private Sewage Disposal and Septage, quoted and re-checked
  13. Marshall County Engineer & Secondary Roads (marshallcountyia.gov)
  14. Floodplain Management, quoted and re-checked
  15. Zoning Applications & Permits, quoted and re-checked
  16. Marshall County Zoning Ordinance and Platting/Subdivision Ordinance, quoted and re-checked
  17. Marshall County Zoning Ordinance and Platting/Subdivision Ordinance, quoted and re-checked
  18. IAC 567—Chapter 69 Private Sewage Disposal Systems, quoted and re-checked
  19. Private Sewage Disposal and Septage, quoted and re-checked
  20. IAC 567—Chapter 69 Private Sewage Disposal Systems, quoted and re-checked
  21. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  22. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  23. Marshall County Environmental Health (marshallcountyia.gov)
  24. Zoning Ordinances including Ordinance No. 10 Platting and Subdivision, quoted and re-checked
  25. marshallcountyia.gov, quoted and re-checked
  26. Marshall County Zoning Ordinance and Platting/Subdivision Ordinance, quoted and re-checked
  27. Engineer Permits, quoted and re-checked
  28. IAC 567—Chapter 69 Private Sewage Disposal Systems, quoted and re-checked
  29. Effective property tax rate: Bolthole Index county data
  30. Median property tax bill: Bolthole Index county data

Written October 7, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

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

RuleMarshall CountyJasper CountyStory CountyTama CountyHardin CountyGrundy CountyPoweshiek County
Building permitRequiredRequiredRequiredLimitedRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Env. HealthCounty Community DevelopmentCounty Env. Health Dept.County SanitarianCounty Env. HealthCounty SanitarianCounty Sanitarian

County locator

Marshall County in Iowa

47
County map
Marshall County highlighted among the Iowa counties · colored by Index score

How Marshall County scores

Seclusion40100% ev.
Self-Sufficiency26100% ev.
Admin Boringness50100% ev.
Durability58100% ev.
Property Autonomy51100% ev.
Carry Cost59100% 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 →

$197kTypical home
1.5%Property tax
$9,375Land / acre
36.1"Annual rain
11.5% of yrsSevere drought
3.4 / yr (+3.2)Mid-century 100°F days
17 daysMid-century dry spell
1.89" (+10.9%)Mid-century 1-day rain
1.83×Wildfire change factor
100%Forward climate coverage
$1,642Home insurance / yr
2.9% / yrInsurance growth
1.08%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
44,713People within 30 min
1,922,871People within 2 hr
42,872Radius comparison (15 mi)
69.9People / sq mi
0.4%Federal land
94.4%Land at 15% slope or less
4.9%Soils rated "not limited" for septic (strict USDA rating)
17,711 acWorkable land screen
4.8%Wooded land
28.2 tonsBiomass / forest ac
48.2°FAvg temp

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Cities and towns in Marshall 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 researched: Albion · Clemons · Ferguson · Gilman · Haverhill · Laurel · Le Grand · Liscomb · Melbourne · Rhodes · St. Anthony · State Center

Answers from the rulebook for Marshall County

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

Marshall County rules

  • Building permitRequired

    Construction, reconstruction, enlargement, alteration, movement, or occupancy/use changes involving buildings or structures in unincorporated Marshall County.

    • No structure 120 square feet or less in area is required to obtain a building permit.
    • The applicant must be the owner, contract buyer of record, or an authorized agent.
    • Permits expire after six months if work has not commenced; proposed work must be completed within one year from issuance.

    small-structure permit threshold: <= 120 sq ft (No structure at or below this area requires a building permit.) · permit fee for value $0-$10,000: 3% of value USD · permit fee for value $10,001 and up: $300 plus 0.2% of total value USD

    “It shall be unlawful to do any excavating, erecting, constructing, reconstructing, enlarging, altering or moving of any building or structure until a Building Permit shall have been issued by the Zoning Administrator.”
  • County-wide zoningPresent

    Land-use zoning in unincorporated Marshall County.

    • The source expressly limits this statement to unincorporated Marshall County.
    “All of unincorporated Marshall County is zoned and permits are required for most structures (pole buildings, dwellings, decks, signs, etc.).”
  • Local zoningPresent (with conditions)

    County-administered zoning in the unincorporated portion of Marshall County.

    • This claim does not characterize zoning administered by incorporated municipalities.
    “All of unincorporated Marshall County is zoned and permits are required for most structures (pole buildings, dwellings, decks, signs, etc.).”
  • Zoning districtsPublished (with conditions)

    County zoning districts and related official zoning materials for unincorporated Marshall County.

    • The county zoning page lists Agricultural A-1, Residential R-1, R-2, R-3, Flood Plain Overlay, Special Uses, and Building Permits articles.
    • Specific applicability depends on the parcel's zoning district and official zoning map.
    “Article VI-Agricultural District “A-1” Article VII-Residential District “R-1” Article VIII-Residential District “R-2” Article IX-Residential District “R-3” Article XII-Flood Plain Overlay District Article XVIII-Special Uses Article XIX-Building Permits”
  • Minimum dwelling sizeSpecified

    Single-family dwellings in county residential zoning districts; the cited example is the R-3 district.

    • The R-3 district requires minimum ground-floor area exclusive of open porches, garages, or steps.
    • Other districts have different dimensional schedules.

    one-story minimum ground-floor area: >= 1000 sq ft (Exclusive of open porches, garages or steps.) · two-story minimum ground-floor area: >= 800 sq ft (Exclusive of open porches, garages or steps.)

    “MINIMUM GROUND FLOOR AREA* One Story: 1,000 sq. feet Two Story: 800 sq. feet *(Exclusive of open porches, garages or steps.)”
  • Minimum lot sizeSpecified

    Lots and building sites in unincorporated Marshall County, with requirements varying by zoning district.

    • Lots may not be reduced below the minimum width and area requirements for the district.
    • Exceptions may be available by Board of Adjustment permit or by adding land to another parcel.
    “No parcel of land which has less than the minimum width and area requirements for the District in which it is located may be cut off from another parcel of land for the purpose, whether immediate or future, of building or development as a lot, except by permit of the Board of Adjustment or except where it is added to another parcel to meet the requirements of this Ordinance.”
  • SetbacksSpecified

    Required yards and setbacks in county zoning districts, including corner lots.

    • Corner lots platted after the ordinance effective date apply the front-yard setback to both street sides.
    • Older recorded corner lots have a special side-yard rule subject to the ordinance's detailed exceptions.
    “For corner lots platted after the effective date of this Ordinance, the front yard setback shall apply to both street sides of the lots.”
  • Living in an RVLimited

    Habitation of recreational vehicles, fifth-wheel trailers, and campers in unincorporated Marshall County.

    • Habitation for more than 90 days in any 365-day period requires a special use permit.

    habitation limit without special use permit: > 90 days per 365-day period (Special use permit required.)

    “No recreational vehicle nor fifth wheel trailer or camper shall be used as a habitation for more than 90 days in any 365 day period without a special use permit.”
  • Manufactured homesAllowed (with conditions)

    Manufactured homes in the A-1 agricultural district.

    • The manufactured home must be placed on a permanent foundation and converted to real property and taxed as a site-built dwelling as provided by law.
    “Single Family Residences - Includes single family dwellings, manufactured homes when placed on a permanent foundation, and converted to real property and taxed as site-built dwelling as provided by law; and farmstead which has been severed from the farm and is no longer held and operated in conjunction with an agricultural land use.”
  • Who permits septicCounty (with conditions)

    Private sewage disposal systems serving four homes or fewer or fewer than fifteen people in Marshall County.

    • County regulation must comply with Iowa DNR minimum standards.
    “In Iowa, local boards of health have primary responsibility for regulation of private sewage disposal systems (PSDSs, also known as onsite wastewater treatment systems) serving 4 homes or fewer or less than 15 people, while the Iowa DNR has primary responsibility for larger (public) systems.”
  • Septic permitRequired

    Installation or covered alteration of a private sewage disposal system.

    • No private sewage system may be installed or covered alteration made without a construction permit from the administrative authority.
    • A repair that does not change treatment or disposal is exempt.
    • Where public sewer is available, or local ordinance requires connection, private sewage disposal may not be installed, repaired, or rehabilitated.
    • If public sewer is unavailable, buildings where people reside, congregate, or work must have an approved private sewage disposal system.
    “No private sewage disposal system shall be installed or altered as described in paragraph 69.1(3)“c” unless a construction permit issued by the administrative authority has been obtained.”
  • Off-grid sanitationLimited

    Private sewage disposal systems used where public sewer is unavailable.

    • An approved private sewage disposal system is required when a POTW is unavailable for a building where people reside, congregate, or work.
    • Private systems are prohibited where POTW is available or connection is locally required.
    • Discharge to ditches, waterways, groundwater, surface ground, abandoned wells, agricultural drainage wells, or sinkholes is prohibited.
    “When a POTW is not available, every building wherein persons reside, congregate, or are employed shall be provided with an approved private sewage disposal system.”
  • Well permitRequired

    Private water wells serving a new dwelling in Marshall County.

    • The permit application must be completed by the well contractor and returned with payment.
    • A well-site survey is conducted before issuance.
    • A completed well record must be submitted after drilling.
    • Water-well permits will not be issued where community or public water is available.
    “If your water supply will be serving a new dwelling, a well permit must be issued prior to issuing the building permit. Water well permits will not be issued to individuals who have access to community or public water supply.”
  • Mandatory utility hookupConditional

    Connection to public sewer versus use of private sewage disposal systems.

    • A private sewage disposal system cannot be installed, repaired, or rehabilitated where a publicly owned treatment works is available or where local ordinance requires connection.
    • A POTW may be considered unavailable when it or a connected building or exterior drainage facility is more than 200 feet from the proposed building or exterior drainage facility on an abutting lot.
    • When no POTW is available, buildings where people reside, congregate, or work must have an approved private sewage disposal system.

    POTW unavailability distance: > 200 feet (Final determination is made by the administrative authority.)

    “No private sewage disposal system shall be installed, repaired, or rehabilitated where a publicly owned treatment works (POTW) is available or where a local ordinance requires connection to a POTW.”
  • Subdividing landRegulated (with conditions)

    Subdivision of land in the unincorporated portion of Marshall County.

    • Required improvements must be installed or secured by bond, surety bond, or cash escrow before final plat approval.
    • The county may waive completion or bonding requirements for certain plats within two miles of cities or towns having sufficient subdivision regulations.
    • Minor subdivisions of no more than three lots fronting an existing public road may receive reduced improvement requirements, subject to safe-access approval.

    improvement security: 130 percent of estimated cost (Surety or escrow amount for uncompleted improvements.) · minor subdivision maximum: <= 3 lots (All lots must front an existing public road or street.)

    “Any subdivider of land within the unincorporated portion of the county required by this Ordinance to prepare a subdivision plat shall, at the subdivider’s expense, install and construct all improvements required by this Ordinance or shall post either a bond, surety bond, or cash escrow before the final plat is approved by the Board.”
  • Driveway accessRequired

    Any driveway or entrance coming off the Marshall County right-of-way.

    • The permit must be on file in the County Engineer’s office.
    • The cited requirement concerns access from the county right-of-way; it does not establish requirements for every private or municipal road.
    “Any driveway or entrance coming off of the County's right-of-way must have a permit on file in the Engineer's office.”
  • Building in a floodplainRequired

    Development in a Special Flood Hazard Area or floodplain in Marshall County.

    • The process may require county, Iowa DNR, and U.S. Army Corps of Engineers permits.
    • IDNR Base Flood Elevation data must be obtained before the county permit.
    • Structures must be elevated at least one foot above BFE.
    • An Iowa-certified professional land surveyor must certify the elevation certificate submitted to close out permitting.

    minimum elevation above BFE: >= 1 foot

    “If a project is desired in an area that is located in the Special Flood Hazard Area (SFHA) or floodplain, a floodplain development permit is required.”
  • Permit feesPublished (with conditions)

    Marshall County building permits under Article XIX.

    • For project values from $0 through $10,000, the fee is 3% of value.
    • For values of $10,001 and up, the fee is $300 plus 0.2% of total value.

    fee for value $0-$10,000: 3 percent of value · fee for value $10,001 and up: 300 USD plus 0.2% of total value

    “For values of $0-$10,000 a fee of 3% of the value. For values of $10,001 and up a fee of $300 plus 0.2% of the total value.”
  • Permit processPublished (with conditions)

    County building and zoning permit process in unincorporated Marshall County.

    • Applications require plans in duplicate, site/lot information, intended use, staking before construction, required fees, and review for zoning, floodplain, and platting compliance.
    • The permit applicant must be the owner, contract buyer, or authorized agent.
    “The application shall be reviewed for conformance with all zoning requirements, flood plain regulations and platting requirements. No permit will be issued unless the applicant is the owner or contract buyer of record or is acting as the agent representing the property owner as authorized in writing.”

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.”
  • 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”
  • 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.”
  • 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”
  • county zoning authorityGeneral

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

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

    Iowa counties may adopt, administer, and enforce county building codes and may administer and enforce the state building code for buildings, including residential construction, in county jurisdiction outside incorporated municipalities, subject to statutory limitations.

    • A county building code may not apply within the incorporated area of a city except at the city's option.
    • A county building code may not apply within a city's two-mile limit under Iowa Code §414.23 to the extent the city has adopted a building code within that two-mile limit.
    • A county building code may not apply to farm houses or other farm buildings primarily adapted for agricultural purposes while so used or under construction for that use.
    • Administration and enforcement are conducted as prescribed by local law or ordinance.
    • The state building code applies in a governmental subdivision only after the governing body adopts an ordinance accepting it and files a certified copy with the commissioner; the ordinance fixes the effective date, which must be no more than six months after adoption.
    • A local building department may prohibit commencement of construction until a permit is issued after showing compliance with applicable state building-code provisions.
    • Thermal-efficiency energy-conservation standards apply to construction containing heated or cooled enclosed space, but the commissioner must provide appropriate exceptions where applying an energy-conservation requirement would be impractical.
    “The power to adopt, administer, and enforce the state building code shall be exercised in accordance with chapter 103A. The power to adopt by ordinance, administer, and enforce a county building code, is subject to the following restrictions: a. A county building code shall not apply within the incorporated area of a city except at the option of the city, and shall not apply within a city’s two-mile limit referred to in section 414.23, to the extent that the city has adopted a building code within the two-mile limit. b. A county building code shall not apply to farm houses or other farm buildings which are primarily adapted for use for agricultural purposes, while so used or under construction for that use.”

Still unanswered

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

  • Building height — General building-height limits in county zoning districts.
  • Camping on your land — Temporary camping in tents or other temporary accommodations in unincorporated Marshall County.
  • Tiny homes — Tiny-home occupancy in unincorporated Marshall County.
  • Short-term rentals — Short-term rental use in unincorporated Marshall County.

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 Marshall County, Iowa

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

Marshall County scores 47/100 on the Bolthole Index, a solid county profile. Its strengths: higher long-term carry cost. Watch-outs: workable self-sufficiency basics (36.1″/yr rainfall) and about 44,713 people within a 30-minute drive.

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

Marshall County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Marshall County Environmental Health (county Board of Health, under Iowa DNR private sewage rules). 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.

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

Living in an RV on your own land in Marshall County is limited to specific cases: Habitation of recreational vehicles, fifth-wheel trailers, and campers in unincorporated Marshall County. Habitation for more than 90 days in any 365-day period requires a special use permit. Confirm with the county before relying on it.

How much does land cost in Marshall County, Iowa?

Land in Marshall County runs about $9,375 per acre, based on the latest county data.

What is the water situation in Marshall County?

Marshall County gets about 36.1" of rain a year, with severe drought in roughly 11.5% of years.

How remote is Marshall County?

A representative private-land location has about 44,713 people within a 30-minute drive and 1,922,871 within two hours. The road-network catchments count population across county lines and clusters of smaller cities; straight-line radius values remain available as a comparison.

How Marshall compares in Iowa

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