Cass County, IA: Owner-Builder Allowed

Unincorporated Cass County, Iowa requires a building permit before covered construction, reconstruction, structural alteration, enlargement or movement of a building or structure¹. Cass County also has rural zoning, while septic permits and inspections go through Cass County Environmental Health^1,2.

At a glance

Building permit: Required before covered construction or structural changes in unincorporated Cass County¹
Zoning: County zoning applies in rural Cass County, with several district types and an official zoning map¹
Occupancy certificate: Required for new non-single-family occupancy and covered changes of use¹
Septic: Contact Environmental Health for a percolation test, permit and inspection before covering the system²
RV living: Long-term residential use on a private parcel could not be confirmed; ask Zoning & Planning³
Accessory dwelling: County rules address secondary farm dwellings and limited caretaker or operator units; statewide conditions also apply^1,4
Owner-builder: Own-property work is exempt from contractor registration, not from county permits; the electrical-license exemption excludes new houses^5,6
Private well: Both state and county permits are required, followed by a water test²

Who to call

Building permits

Cass County Zoning & Planning

Building-permit applications, rural zoning, subdivisions, zoning amendments, special exceptions, variances and rural address applications

(712) 254-1500

Cass County Courthouse, 5 West 7th Street, Atlantic, IA 50022

Septic permits

Cass County Environmental Health

Cass County septic-system and private-well permits, testing and inspections under the county's contract with Guthrie County

(641) 747-3972

Guthrie County Environmental Health, 200 N 5th Street, Guthrie Center, IA 50115

One more officeRoads & driveways

Roads & driveways

Cass County Engineer's Office

County-road driveway location, sight-distance and culvert review, plus county road and bridge work

(712) 243-2442

5 W 7th Street, Atlantic, Iowa 50022

Contact details are copied from each office’s official page and were checked against it on October 9, 2026.

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

Yes.

Yes. Before covered construction, reconstruction or structural alteration in unincorporated Cass County, obtain a building permit from the county Administrative Officer¹. The county publishes a $10 residential building-permit fee; other building permits cost $1 per $1,000 of construction cost, subject to a $50 minimum and $250 maximum¹. Submit the application and supporting plans before work begins; the Administrative Officer must approve or deny it within seven days and give written reasons for a denial¹. An Occupancy Compliance Certificate is also required before a covered change of use or occupancy and before a new building is occupied for a non-single-family purpose¹. Cass County's general building-code adoption and ordinary construction-inspection requirements could not be confirmed, so ask Zoning & Planning what review applies³. Iowa's owner exemption for electrical work covers only an existing principal residence that is not new construction; a new house needs a licensed electrical contractor, and inspections are required for all new electrical installations⁶.

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

Cass County Zoning & Planning handles building-permit applications and rural zoning from the Cass County Courthouse, 5 West 7th Street, Atlantic, IA 50022; call (712) 254-1500.

Cass County Zoning & Planning handles building-permit applications and rural zoning from the Cass County Courthouse, 5 West 7th Street, Atlantic, IA 50022; call (712) 254-1500³. Cass County Environmental Health handles septic and private-well work from Guthrie County Environmental Health, 200 N 5th Street, Guthrie Center, IA 50115; call (641) 747-3972². For a new driveway on a county road, contact the Cass County Engineer's Office at 5 W 7th Street, Atlantic, Iowa 50022, phone (712) 243-2442⁷. A floodplain development permit is required before buildings, fill, grading, paving, excavation, drilling or factory-built-home placement in the regulated floodplain¹.

Does Cass County have zoning?

Yes.

Yes. Cass County zoning applies in unincorporated territory rather than inside incorporated municipalities¹. The ordinance uses Exclusive Agricultural, General Agricultural, Rural Residential, Suburban Residential, Business, Light Industrial and Heavy Industrial districts, with boundaries shown on the official zoning map¹. Existing acreages must be at least one acre, while new acreages surveyed from farms after September 1, 2005 must be at least three acres; district-specific rules can also apply³. Building-height limits vary by district¹. Qualifying agricultural land and structures are generally exempt while used for agriculture, but floodplain rules still apply¹. Ask Zoning & Planning to confirm the parcel's district, setbacks and approvals³.

How do septic permits work in Cass County?

Cass County Environmental Health, operated under contract with Guthrie County, administers septic work in Cass County.

Cass County Environmental Health, operated under contract with Guthrie County, administers septic work in Cass County². For a new or replacement system, contact Environmental Health first; a percolation test precedes permit issuance, and the installed system must be inspected before it is covered². In a subdivision, municipal sewer is required where reasonably available; if it is not practical, the county allows a progression through community treatment to Board-approved private systems that also need County Board of Health approval¹. Qualifying property transfers also require Iowa's time-of-transfer septic inspection, subject to statutory exceptions⁸. None of Cass County's mapped soil area is rated free of severe limitations for a conventional drain field, so test feasibility early⁹.

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

Cass County's rule for long-term residential RV occupancy on a private parcel could not be confirmed; campground rules do not answer whether one RV may serve as a residence on an individual lot.

Cass County's rule for long-term residential RV occupancy on a private parcel could not be confirmed; campground rules do not answer whether one RV may serve as a residence on an individual lot. Privately operated campgrounds require a special exception and development plan, while commercial campgrounds or tourist camps require at least three acres and approved water and sewage facilities¹. Mobile-home parks require a special exception, at least five acres, limited density, and approved community or municipal water and sewage¹. A specific tiny-home rule could not be confirmed, so ask Zoning & Planning how the proposed unit is classified³. County rules allow certain secondary farm dwellings for farm employees or immediate family and limited caretaker or operator dwellings in commercial structures¹. Separately, Iowa bars a county from disallowing a proposed home solely because it is a manufactured home and requires it to meet the same foundation, setback and minimum-size standards as a site-built single-family dwelling on that lot¹⁰. Effective July 1, 2026, statewide conditions require Cass County to allow at least one accessory dwelling unit where a single-family home is a principal use⁴.

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

Call Cass County Zoning & Planning at (712) 254-1500 to identify the zoning district, verify the use and setbacks, and obtain the permit form.

Call Cass County Zoning & Planning at (712) 254-1500 to identify the zoning district, verify the use and setbacks, and obtain the permit form^1,3.

If dividing land into three or more lots, or creating a new road, file a preliminary plat; land within two miles of a city with extraterritorial control must also follow that city's process¹.

Submit the building application and plans before work begins; the Administrative Officer must approve or deny it within seven days¹.

Contact Environmental Health at (641) 747-3972 for the septic percolation test, permit and pre-cover inspection, and obtain state and county permits before drilling a well².

Ask the Engineer's Office to review county-road access and any culvert, and obtain a floodplain permit before regulated floodplain development^1,7.

What should you check before buying land in Cass County?

Confirm the parcel's zoning district and minimum lot rules before closing, because Cass County uses different district schedules and new acreages surveyed from farms after September 1, 2005 must be at least three acres^1,3. Ask whether a proposed split triggers subdivision review or overlapping city review¹. Test septic feasibility early because none of the county's mapped soil area is rated free of severe limitations for a conventional drain field⁹. Confirm county-road access with the Engineer's Office; Cass County reviews sight distance and culvert sizing, and the landowner pays for a new culvert when needed⁷. Check flood status before improvements; factory-built homes in regulated flood areas must be anchored and elevated on a permanent foundation above the stated flood level¹. A private well requires state and county permits plus a water test².

Watch-outs

Iowa's own-property exemption affects contractor registration only; it does not cancel Cass County's building-permit requirement^1,5.
Cass County's long-term private-parcel RV rule and tiny-home occupancy rule could not be confirmed; ask Zoning & Planning before buying or moving a unit onto land³.
A new county-road driveway may require a landowner-paid culvert after the Engineer's Office reviews drainage and sight distance⁷.

Sources

10 official pages, each quoted and re-checked · written October 9, 2026

Written October 9, 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 Cass County means bringing your own water and power. The kit we’d start with:

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Compared with neighboring counties

Like 5 of its 6 neighbors, Cass County has countywide zoning.

Rule	Cass County	Adair County	Montgomery County	Adams County	Audubon County	Pottawattamie County	Shelby County
Building permit	Required	Not required	Limited	Required	Required	Required	Limited
County zoning	Yes	No	Yes	Yes	Yes	Yes	Yes
Septic permits	County Env. Health Office	County Env. Health	County Public Health	County Env. Health	County Sanitarian	County Public Health	County Env. Health Office

Cities and towns in Cass 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: Atlantic · Cumberland · Griswold · Lewis · Marne · Massena

Answers from the rulebook for Cass County

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

Cass County rules

Building permitRequired
Buildings and structures in unincorporated Cass County, including erection, reconstruction, structural alteration increasing exterior dimensions, height, floor area, dwelling units, or changing use.
- The county zoning page also states that building, rebuilding, altering, enlarging, or moving any building or structure requires an application.
- Agricultural-use exemptions and municipal rules may affect applicability.
“Subsequent to the adoption of this ordinance a building permit shall be obtained from the Administrative Officer before any building or structure shall be erected, reconstructed, or structurally altered to increase the exterior dimensions, height, floor area, number of dwelling units or to accommodate a change in use of the building and/or premises or part thereof.”
Zoning and Planning ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Required — Buildings and structures erected, reconstructed, or structurally altered in the unincorporated county zoning jurisdiction.
  “a building permit shall be obtained from the Administrative Officer before any building or structure shall be erected, reconstructed, or structurally altered”
  Zoning and Planning ↗Re-checked Oct 2, 2026
Certificate of occupancyRequired
Changes in land/building use or occupancy, and new non-single-family buildings, under the county zoning ordinance.
- No change in use or occupancy of land or an existing building, other than single-family dwelling purposes, may be made until an Occupancy Compliance Certificate is issued.
- A new building may not be occupied for a purpose other than a single-family dwelling until the certificate is issued.
- Applications must be made before assuming occupancy; the Administrative Officer must approve or deny within seven days.
- The certificate must state that the new occupancy complies with the ordinance.
application decision period: 7 days (Administrative Officer approval or denial)
“any new building be occupied for any purpose other than a single-family dwelling until an Occupancy Compliance Certificate has been issued by the Administrative Officer.”
Cass County Code of Ordinances ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Required — Changes in land use or occupancy other than single-family dwelling purposes, and new buildings occupied for a purpose other than a single-family dwelling, in the county zoning jurisdiction.
  “Occupancy Compliance Certificate has been issued”
  Cass County Code of Ordinances ↗Re-checked Oct 2, 2026
County-wide zoningPresent (with conditions)
Cass County zoning in unincorporated territory.
- The ordinance applies to all unincorporated territory of Cass County.
- The ordinance does not apply to land, farmhouses, farm barns, farm outbuildings, or other buildings, structures, or erections primarily adapted for agricultural purposes while so used, except to the extent required to implement the Agricultural Land Preservation Ordinance contained in Ordinance 335 of the Code of Iowa as amended.
- Regulations relating to any structure, building, dam, construction deposit, or excavation in a river or stream flood plain apply equally to agricultural and non-agricultural lands, buildings, and uses.
- The county zoning page states that the ordinance was adopted in 1962 and updated in 1982 and 2003.
“The provisions of this ordinance shall apply to all the unincorporated territory of Cass County, Iowa;”
Zoning and Planning ↗Re-checked Oct 5, 2026
2 more reviewed findings on this topic
- Present (with conditions) — Cass County zoning regulation in unincorporated territory.
  “The Cass County Zoning department is responsible for the zoning in the rural areas of Cass County.”
  Zoning and Planning ↗Re-checked Oct 2, 2026
- Present — Zoning in the unincorporated and rural areas of Cass County.
  “The provisions of this ordinance shall apply to all the unincorporated territory of Cass County, Iowa; except to the extent required to implement the Agricultural Land Preservation Ordinance contained in Ordinance 335 of the Code of Iowa as amended, no regulation or requirement adopted under the provisions of this ordinance shall be construed to apply to land, farmhouses, farm barns, farm outbuildings or other buildings, structures, or erections which are primarily adapted, by reasons of nature and area, for use for agricultural purposes, while so used; provided, however, that such regulations or requirements which relate to any structure, building, dam, construction deposit or excavation in or on the flood plains of any river or stream shall apply equally to agricultural and non agricultural lands, buildings and uses.”
  Zoning and Planning ↗Re-checked Oct 2, 2026
Zoning districtsPublished (with conditions)
Zoning districts and district regulations in unincorporated Cass County.
- The ordinance lists AE Exclusive Agricultural, AG General Agricultural, RR Rural Residential, RS Suburban Residential, B Business, IL Light Industrial, and IH Heavy Industrial districts.
- Locations and boundaries are shown on the Official Zoning Map; district regulation schedules follow in the ordinance.
“The following districts and regulations therefore are hereby established for the unincorporated areas of the County”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
Minimum lot sizeSpecified
Acreages in Cass County under the county zoning/planning program.
- Existing acreages must be at least one acre.
- New acreages surveyed off farms after September 1, 2005 must be at least three acres.
- The zoning page does not expressly state whether the acreage rule applies inside incorporated municipalities.
existing acreage minimum: >= 1 acre · new acreage surveyed off farms after September 1, 2005 minimum: >= 3 acres
“Existing acreages in the County shall be a minimum of one (1) acre.”
Zoning and Planning ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Specified — Lots and residential uses in unincorporated county zoning districts.
  “Existing acreages in the County shall be a minimum of one (1) acre. Any new acreages surveyed off farms after September 1, 2005, shall be a minimum of three (3) acres.”
  Zoning and Planning ↗Re-checked Sep 26, 2026
SetbacksSpecified
Structures in the AG General Agricultural District in unincorporated Cass County.
- The listed setbacks are the district's minimum yard requirements.
- Before a permit for any use in this district, the applicant must submit water-supply and sewage-disposal plans and evidence that needed facilities are adequate; the County Health Department and, where applicable, the State Department of Environmental Quality must approve them.
front yard: 50 feet · rear yard: 35 feet · side yard: 25 feet · street-side yard on corner lot: 40 feet
“Front 50 feet Rear 35 feet Side 25 feet Street side, corner lot 40 feet”
Code of Ordinances, Cass County, Iowa ↗Re-checked Nov 13, 2026
Building heightSpecified
Maximum building heights in unincorporated county zoning districts.
- Limits vary by district.
- The AG district schedule allows four stories or 50 feet.
- The RS district schedule allows three and one-half stories or 40 feet.
- The B district schedule allows three stories or 50 feet.
AG maximum height: 4 stories or 50 feet · RS maximum height: 3.5 stories or 40 feet · B maximum height: 3 stories or 50 feet
“Maximum Height Four (4) stories or fifty (50) feet”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
Living in an RVTemporary only (with conditions)
Travel trailers or camping trailers used as a place of human habitation in the county zoning ordinance's unincorporated-area districts.
- The vehicle must be customarily used for vacation or recreation purposes.
- Human habitation may not exceed 90 days in any 12-month period; otherwise it is classed as a mobile home regardless of size and weight limitations.
- This is a zoning-ordinance definition; separately, flood-plain rules impose anchoring and elevation requirements on qualifying recreational vehicles located more than 180 consecutive days or not ready for highway use.
maximum human habitation: <= 90 days in any 12-month period (A vehicle exceeding this limit is classed as a mobile home.)
“not used as a place of human habitation for more than 90 days in any 12 month period”
Code of Ordinances, Cass County, Iowa ↗Re-checked Nov 13, 2026
Camping on your landLimited
Privately operated campgrounds, youth or summer camps, and commercially operated campgrounds or tourist camps in county zoning districts.
- Privately operated campgrounds and similar outdoor recreation activities require a special exception and a development plan.
- Commercially operated campgrounds or tourist camps require sites of at least three acres.
- No commercial campsite may be within 50 feet of a Residential District.
- Water supply and sewage disposal facilities must be approved by the County Board of Health and the State Department of Natural Resources.
minimum commercial campground site: >= 3 acres · minimum campsite separation from Residential District: >= 50 feet
“Commercially operated campgrounds or tourist camps on sites of not less than three (3) acres”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
Manufactured homesLimited
Mobile/manufactured-home parks in unincorporated Cass County.
- Mobile-home parks require a special exception.
- Parks must be on tracts of at least five acres and may have no more than eight mobile homes per acre.
- Community or municipal water and sewage systems approved by county and state health departments are required.
mobile-home park minimum tract: >= 5 acres · maximum mobile homes: per 8 per acre
“Mobile home parks on tracts of five (5) acres or more”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Limited — Factory-built homes in areas regulated by the Cass County floodplain ordinance.
  “All factory-built homes, including those placed in existing factory-built home parks or subdivisions, shall be anchored to resist flotation, collapse, or lateral movement.”
  Cass County Code of Ordinances ↗Re-checked Oct 2, 2026
Accessory dwellingsLimited
Secondary farm dwellings and caretaker/operator dwelling units described in the county zoning ordinance.
- Secondary farm dwellings are limited to the same ownership as the farming operation and occupancy by persons employed on the farm.
- A farm owner may set aside one plot for a single-family dwelling occupied by an immediate family member.
- Dwelling units in commercial structures are limited to watchmen, caretakers, or operators and require an open yard of at least 2,400 square feet per unit and two off-street parking spaces per unit.
open yard per commercial-structure dwelling: >= 2400 square feet · off-street parking: per 2 spaces per unit
“Secondary farm dwellings under same ownership as farming operation which are occupied or maintained for use and occupancy by persons employed on the farm.”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
Who permits septicCounty
Septic administration for Cass County, operated through the county environmental-health program.
- Cass County contracted with Guthrie County in 1989 to operate its environmental-health program.
- The county page directs septic applicants to the Environmental Health Department.
“In 1989 the Cass County Board of Supervisors (through the Cass County Board of Health) contracted with Guthrie County to operate its program. This was a more cost-effective means of providing full-time services than hiring a full-time person in Cass County.”
Environmental Health Office ↗Re-checked Oct 2, 2026
Septic permitRequired
Installing or replacing a septic system in Cass County.
- A percolation test is performed before issuance.
- The Environmental Health Department administers the process.
“Anyone needing to install or replace a septic system in Cass County needs to contact the Environmental Health Department. After a percolation test is done, a permit is then issued, and an inspection is done before the system is covered up.”
Environmental Health Office ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Required — Installation or replacement of a septic system in Cass County.
  “After a percolation test is done, a permit is then issued, and an inspection is done before the system is covered up.”
  Environmental Health Office ↗Re-checked Oct 2, 2026
Septic inspectionRequired
Installation or replacement of septic systems in Cass County.
- Inspection must occur before the system is covered up.
- A permit follows a percolation test.
“inspection is done before the system is covered up”
Environmental Health Office ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Required — Septic installations or replacements in Cass County.
  “an inspection is done before the system is covered up.”
  Environmental Health Office ↗Re-checked Oct 2, 2026
Off-grid sanitationLimited
Private wastewater disposal in subdivisions where municipal sewer and local/community treatment are not practical.
- The Board of Supervisors may permit private disposal systems upon request.
- Each lot must meet area requirements under the county zoning ordinance.
- The system must be approved by the County Board of Health.
“the Board of Supervisors may, upon request, permit the subdivider to install on each lot, a septic tank and absorption field or other system approved by the County Board of Health”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
Well permitRequired
Drilling a well or heat-pump well in Cass County.
- Both a State and County permit are required.
- The well driller works with Environmental Health.
- A water test is performed after completion.
“To drill a well a State and County permit is required. The well driller will work with the Environmental Health Dept. to see that there is compliance with these rules. After the well is completed, a water test is done as part of the permit. Heat pump wells also require a permit.”
Environmental Health Office ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Required — Drilled wells and heat-pump wells in Cass County.
  “To drill a well a State and County permit is required.”
  Environmental Health Office ↗Re-checked Oct 2, 2026
Mandatory utility hookupConditional
Subdivision utility systems in unincorporated Cass County.
- Where reasonably available, subdivisions must provide a complete sanitary sewer system connected to a municipal sewer system.
- If municipal sewer is not practical, a local or community treatment system may be used under county and state health requirements.
- If those options are not practical, the Board of Supervisors may permit private disposal systems.
- Where public water is not available, a local or community water system may be installed.
“Where reasonably available, the subdivider shall provide the subdivision with a complete sanitary sewer system which shall connect with the sanitary sewer systems of a municipality.”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
Agricultural exemptionConditional
Land, farmhouses, farm barns, farm outbuildings, and other structures primarily adapted for agricultural purposes while so used.
- The exemption is subject to the Iowa Agricultural Land Preservation Ordinance.
- Floodplain-related regulations apply equally to agricultural and non-agricultural lands, buildings, and uses.
“no regulation or requirement adopted under the provisions of this ordinance shall be construed to apply to land, farmhouses, farm barns, farm outbuildings or other buildings, structures, or erections which are primarily adapted, by reasons of nature and area, for use for agricultural purposes, while so used; provided, however, that such regulations or requirements which relate to any structure, building, dam, construction deposit or excavation in or on the flood plains of any river or stream shall apply equally to agricultural and non agricultural lands, buildings and uses.”
Cass County Code of Ordinances ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Conditional — County zoning regulations for land, farmhouses, farm barns, farm outbuildings, and other structures primarily adapted for agricultural purposes while so used.
  “no regulation or requirement adopted under the provisions of this ordinance shall be construed to apply to land, farmhouses, farm barns, farm outbuildings”
  Cass County Code of Ordinances ↗Re-checked Oct 2, 2026
Subdividing landRegulated (with conditions)
Subdivision of land in unincorporated Cass County.
- Subdivision generally includes division into three or more parts, or any division if a new road is involved.
- Agricultural-purpose subdivisions are excluded from the stated jurisdiction clause.
- Subdivisions within two miles of a city with extraterritorial subdivision control must also be submitted to that city and comply with its procedures and Iowa law.
- Preliminary and final plat procedures and required improvements apply.
minimum parts triggering general subdivision jurisdiction: >= 3 parts (Agricultural-purpose divisions and divisions subject to the new-road clause are treated separately) · city proximity threshold: <= 2 miles (Where the city has extraterritorial subdivision control)
“All plats, replats, or subdivision of land into three or more parts in the unincorporated areas of Cass County, for other than agricultural purposes,”
Cass County Code of Ordinances ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Regulated (with conditions) — Division of a separate tract into three or more lots or parcels for transfer or building development, or any division involving a new road.
  “The division of a separate tract of land into three (3) or more lots or parcels for the purpose of transfer of ownership or building development”
  Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
Driveway accessLimited
New and widened rural driveways under the Cass County Engineer’s Office process.
- Cass County checks adequate sight distance and determines culvert size when needed.
- The landowner pays for a new culvert.
- County-installed driveway top width must be at least 24 feet and no more than 40 feet.
- Driveways not requiring a culvert may be installed or widened at no cost to the landowner.
minimum driveway top width: >= 24 feet · maximum driveway top width: <= 40 feet
“Cass County will install the new driveway with a minimum of 24’ and maximum of 40’ top width.”
Engineer’s Office ↗Re-checked Sep 26, 2026
Building in a floodplainRequired
Floodplain development in unincorporated Cass County, including man-made changes such as buildings, filling, grading, paving, excavation, drilling, and placement of factory-built homes.
- A Flood Plain Development Permit must be secured before development.
- The application must identify the work, land, intended use or occupancy, 100-year flood elevation, lowest-floor elevation, and for improvements the estimated improvement cost and pre-improvement market value.
- The applicant must obtain other required federal, state, and local permits.
- A professional engineer or land surveyor must certify specified finished elevations or flood-protection measures before use or occupancy where required by the ordinance.
“A Flood Plain Development Permit issued by the Administrator shall be secured prior to any flood plain development”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
One more reviewed finding on this topic
- Required — Development and structures in areas of significant flood hazard identified by the Cass County floodplain ordinance and the May 16, 2017 FIRM.
  “All development within the areas of significant flood hazard shall:”
  Cass County Code of Ordinances ↗Re-checked Oct 2, 2026
Permit feesPublished (with conditions)
County zoning building permits, occupancy compliance certificates, and moving permits.
- Residential building permit fee is $10.
- Other building permits are $1 per $1,000 of construction cost, with a $50 minimum and $250 maximum.
- Occupancy Compliance Certificate fee is $10.
- Moving Permit fee is $10.
- No fees are charged to the United States Government, State of Iowa, or political subdivisions.
- All fees are required and paid to the Administrative Officer.
residential building permit: 10 USD · other building permit: $1 per $1,000 construction cost USD ($50 minimum; $250 maximum) · occupancy compliance certificate: 10 USD · moving permit: 10 USD
“Other uses and structures – One dollar ($1.00) per thousand of construction cost with a minimum fee of fifty dollars ($50.00) and a maximum fee of two hundred fifty dollars ($250.00)”
Cass County Code of Ordinances ↗Re-checked Sep 26, 2026
Permit processPublished (with conditions)
Applications for county building permits and Occupancy Compliance Certificates.
- Applications must be made before beginning construction or assuming occupancy.
- Applications use forms obtained from the Administrative Officer and must include plans and information needed to determine compliance.
- The Administrative Officer must approve or deny within seven days and provide written reasons for denial.
administrative decision period: 7 days (Approval or denial)
“The Administrative Officer shall within seven (7) days thereof, approve or deny said applications.”
Cass County Code of Ordinances ↗Re-checked Oct 2, 2026
One more reviewed finding on this topic
- Published (with conditions) — County building permit and occupancy certificate applications under the zoning ordinance.
  “The Administrative Officer shall within seven (7) days thereof, approve or deny said applications.”
  Cass County Code of Ordinances ↗Re-checked Sep 26, 2026

Iowa rules that apply here

Owner-builder exemptionConditional
An owner performing electrical work on the owner’s principal residence in Iowa.
- The residence must qualify for the homestead tax exemption.
- The residence must be an existing dwelling rather than new construction.
- The residence must not be larger than a single-family dwelling.
- A new house requires the electrical work to be performed by a licensed Electrical Contractor or Residential Electrical Contractor.
- Inspections are required for all new electrical installations regardless of whether a license is required.
“No, a license is not required for an owner of property performing work on the owner’s principal residence that qualifies for the homestead tax exemption, if such residence is an existing dwelling rather than new construction, and is not larger than a single-family dwelling. A new house will require the electrical work to be performed by a licensed Electrical Contractor or Residential Electrical Contractor. Inspections are required for all new electrical installations regardless of whether a license is required.”
Electrical Licensing FAQs ↗Re-checked Oct 7, 2026
2 more reviewed findings on this topic
- Conditional — Contractor-registration and licensing treatment under Iowa Code chapter 91C for a person performing work or having work performed on the person’s own property.
  “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 for plumbers and mechanical professionals ↗Re-checked Oct 7, 2026
- 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
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
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.

Tiny homes — Tiny-home occupancy outside specifically regulated dwelling, mobile-home, or campground uses.
Short-term rentals — Short-term rental use outside specifically regulated campground or mobile-home-park uses.

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 Cass County, Iowa

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

Cass County scores 52/100 on the Bolthole Index, a solid county profile. Its strengths: sparse surroundings — about 7,509 people within a 30-minute drive and manageable long-term carry cost. Watch-outs: workable self-sufficiency basics (35.9″/yr rainfall).

How much does land cost in Cass County, Iowa?

Land in Cass County runs about $8,221 per acre, based on the latest county data.

What is the water situation in Cass County?

Cass County gets about 35.9" of rain a year, with severe drought in roughly 10.8% of years.

How remote is Cass County?

A representative private-land location has about 7,509 people within a 30-minute drive and 2,083,077 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 Cass County, Iowa