Bolthole Index

Polk County, Iowa

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

50Index Score / 100
#77 of 99 in Iowa

Unincorporated Polk County, Iowa requires a building permit from Polk County Building Services before covered construction begins1. Polk County Planning & Zoning Services applies county zoning to unincorporated land, which controls allowed use, setbacks and lot coverage; incorporated cities may have separate building and zoning rules234. Septic permits go through Polk County Environmental Health Services everywhere except the City of Des Moines5.

At a glance

Building permit
Required before covered construction begins on unincorporated land1
Zoning
Yes; the ordinance divides unincorporated Polk County into districts with different use and dimensional standards26
Septic permit
Required countywide except inside Des Moines; issued by Polk County Environmental Health Services5
RV living
Temporary shelter only: one RV or camper per property, up to 21 days per calendar year and 14 consecutive nights per stay7
Portable tiny home
Not permitted as a standalone accessory dwelling unit8
Owner-builder
State contractor-registration law excludes work on your own property, but county permits and inspections still apply91
Certificate of occupancy
Required before a newly created, changed, enlarged or moved structure or premises is used or occupied10
Permit fees
Required with the application; amounts are set by the Board of Supervisors11

Who to call

Building permits

Polk County Building Services

Reviews plans, issues permits and inspects building construction in unincorporated Polk County under the 2021 International Codes and the state plumbing, mechanical, electrical and energy codes

515-286-3705

publicworks@polkcountyiowa.gov

5885 NE 14 Street, Des Moines, IA 50313

Online permits →

Zoning

Polk County Planning & Zoning Services

Administers zoning, the zoning map, the subdivision ordinance, the county noise ordinance, FEMA floodplain administration and E911 addressing for unincorporated Polk County

515-286-3705

publicworks@polkcountyiowa.gov

5885 NE 14 Street, Des Moines, IA 50313

Septic permits

Polk County Environmental Health Services

Issues permits and inspects private septic and well systems, and reviews Time of Transfer septic inspection reports, for unincorporated Polk County outside the City of Des Moines

515-286-3705

publicworks@polkcountyiowa.gov

5885 NE 14 Street, Des Moines, IA 50313

Online permits →

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Polk 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 Polk County, Iowa?

Unincorporated Polk County, Iowa requires a building permit before covered construction, reconstruction, alteration, conversion or structural work begins1. A permit expires if work does not start within six months; once work starts, it is valid for one year and also becomes void if work stops for more than six consecutive months1. Polk County Building Services reviews plans, issues permits and inspects construction in the unincorporated county, including decks, pools, houses, additions and storage facilities12. The county building rules apply to unincorporated land; Mitchellville issues its own building permits inside city limits413. Septic permits remain with Polk County Environmental Health Services throughout the county except Des Moines5. A filing fee must accompany the application, with the amount set by the Board of Supervisors11. Iowa excludes work on your own property from contractor registration, but county building permits and inspections still apply9. In unincorporated Polk County, the Zoning Administrator must issue a certificate of occupancy after site inspection before a newly created, changed, converted, enlarged or moved structure or premises is used; recurring maintenance and required improvements under an approved subdivision plat are exempt, and a temporary certificate may last up to 6 months10.

Who is the Polk County building department, and how do you reach it?

Polk County Building Services and Planning & Zoning Services are both divisions of Public Works, sharing one office at 5885 NE 14 Street, Des Moines, IA 50313, phone 515-286-3705, open 7:00 am to 4:30 pm1214. Building Services handles your construction permit and inspections; call the same number to request an inspection once your permit is issued12. Planning & Zoning Services, at the same address and phone, handles zoning, the subdivision ordinance, FEMA floodplain administration, the county noise ordinance and E911 addressing14. Septic systems are a separate division again: Polk County Environmental Health Services, also at 515-286-3705 or publicworks@polkcountyiowa.gov, issues septic permits and reviews Time of Transfer inspection reports throughout Polk County except the City of Des Moines15.

Does Polk County have zoning?

Polk County zoning applies to unincorporated land, with different use and dimensional standards by district26. West Des Moines and Mitchellville set their own zoning; septic permits remain with Polk County Environmental Health Services for parcels in Polk County outside Des Moines16175. Lot area, setbacks, coverage and height depend on district, use and development option18192021. Subdivision proposals must also satisfy the applicable zoning district's minimum bulk rules22. Residential building height tops out at 35 feet in most districts and 40 feet in the AG and AT districts under the standard single-family rules23. Nonresidential heights differ: AG and AT allow agricultural buildings up to 135 feet but commercial buildings up to 45 feet; commercial communication towers also face airport height, setback and collapse-radius requirements24. Ask Planning & Zoning Services for the parcel's district before designing a house, accessory building or land division14. Iowa's county-zoning statute generally exempts qualifying agricultural land and structures while used for farming, although floodplain regulation can still apply25. Iowa requires a county to allow an accessory dwelling unit on a qualifying single-family lot subject to state conditions, but Polk County does not permit a portable tiny home to serve as that ADU268.

How do septic permits work in Polk County?

Polk County Environmental Health Services permits and inspects septic systems throughout Polk County except the City of Des Moines515. Iowa's rules require a site evaluation before a septic construction permit issues, and a system cannot be installed where public sanitary sewer is available or a local ordinance requires connection27. The administrative authority may consider sewer unavailable beyond 200 feet from the building; when sewer becomes available within 200 feet, connection is required under the authority's timeframe or conditions28. Only a contractor with an annual professional license from Environmental Health Services can install, alter or repair a system, though anyone can pull a permit to abandon one15. Polk County's own ordinance bars aerobic treatment units outright, so if your soils are marginal, ask Environmental Health Services which system the site can support15. Iowa law also requires a septic inspection by a DNR-certified inspector before you can sell or transfer a home on a septic system, and that inspection is only good for two years; if the tank hasn't been pumped by a licensed cleaner within the prior three years, it must be opened and pumped at inspection29.

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

Temporary camping in an RV or camper is limited in unincorporated Polk County: no more than one unit may be used at a property at a time, for no more than 21 days in a calendar year or 14 consecutive nights in one stay, and health and waste-disposal rules still apply7. Mobile-home dwellings are permitted in unincorporated Polk County only within the Mobile Home Park zoning district, and travel trailers, campers and RVs may not serve as a dwelling inside such a park30. The temporary-shelter allowance in unincorporated Polk County does not authorize full-time RV residence7. Polk County also prohibits using a portable tiny home as a standalone accessory dwelling unit, but the ordinance provision does not establish a general ban on a tiny home used as the principal dwelling318. Ask Planning & Zoning Services whether a proposed principal tiny home fits the parcel's zoning district and dimensional rules146. A code-compliant ADU remains possible under Iowa law on a qualifying single-family lot; a manufactured or mobile unit used as the ADU must be placed on a permanent foundation and converted to real property26.

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

  1. Contact Polk County Planning & Zoning Services at 515-286-3705 to identify the parcel's zoning district, allowed use, setbacks, lot coverage, height limit and any floodplain overlay146192021.
  2. Confirm that the lot and proposed layout meet the district standards; if the project divides land, confirm subdivision requirements too1822.
  3. Secure a floodplain development permit before any development in a floodplain32.
  4. Apply to Building Services before starting covered construction and include the filing fee set by the Board of Supervisors111.
  5. If the site lacks public sewer, obtain the septic permit through Environmental Health Services and use a county-licensed contractor for installation, alteration or repair15.
  6. Call 515-286-3705 for required inspections as work progresses12.
  7. Obtain the certificate of occupancy after the required inspections and before occupying the completed structure10.
  8. If the driveway connects to an Iowa primary highway, obtain Iowa DOT approval before work begins33.

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

If the home you're buying is on a septic system, Iowa law requires a DNR-certified inspection before a qualifying transfer, and Polk County Environmental Health Services reviews that report, so ask for it early2915. Only about 26.1% of Polk County's land is rated free of severe limits for a conventional drain field, and the county bans aerobic treatment units, so confirm an acceptable system before relying on a building site3415. About 95.4% of the land has a slope of 15% or less35. Development in a floodplain requires a county floodplain development permit before work begins, plus all other necessary permits and a certified as-built plan when complete32. Confirm road access and utilities before closing; in a floodplain, private roads and driveways serving a principal structure must support emergency and fire access during floods36; we could not confirm a general county driveway permit rule, so ask Public Works before designing access14. Iowa requires a construction permit for private water-supply wells through the local county health department; ask Polk County Environmental Health Services about the application3715. The effective property-tax rate is about 1.8%, the median annual bill is about $4,364, and farmland value is about $9,677 per acre383940.

Watch-outs

  • Polk County bans aerobic treatment units outright, so don't assume an ATU is an option on a lot with poor septic soils; ask Environmental Health Services what alternative systems they do allow15.
  • Temporary camping in an RV or camper is limited in unincorporated Polk County, not full-time residence; the limit is 21 days per calendar year, 14 consecutive nights per stay and one unit at a time per property7.
  • A portable tiny home cannot be used as a standalone accessory dwelling unit in unincorporated Polk County, but the cited rule does not decide whether one may serve as the principal dwelling8.

Sources

  1. Zoning Ordinance, quoted and re-checked
  2. Polk County Zoning Ordinance, quoted and re-checked
  3. Polk County Zoning Ordinance, quoted and re-checked
  4. Building Services - Polk County Iowa, quoted and re-checked
  5. Polk County Environmental Health Services (2026 county census)
  6. Polk County Zoning Ordinance, quoted and re-checked
  7. Polk County Zoning Ordinance, quoted and re-checked
  8. Polk County Zoning Ordinance — Unincorporated Polk County, Iowa, quoted and re-checked
  9. Iowa Code § 91C.1 — Definition and exemption, quoted and re-checked
  10. Polk County Zoning Ordinance, quoted and re-checked
  11. Polk County Zoning Ordinance, quoted and re-checked
  12. Polk County Building Services (polkcountyiowa.gov)
  13. Mitchellville: official source (Polk County), quoted and re-checked
  14. Polk County Planning & Zoning Services (polkcountyiowa.gov)
  15. Polk County Environmental Health Services (polkcountyiowa.gov)
  16. West Des Moines: Title 9 Zoning (Polk County), quoted and re-checked
  17. Mitchellville: Chapter 169 Zoning Code - District Regulations (Polk County), quoted and re-checked
  18. Polk County Zoning Ordinance, quoted and re-checked
  19. Polk County Zoning Ordinance, quoted and re-checked
  20. Polk County Zoning Ordinance, quoted and re-checked
  21. Polk County Zoning Ordinance, quoted and re-checked
  22. Polk County Zoning Ordinance, quoted and re-checked
  23. Polk County Zoning Ordinance — Building Height Standards, quoted and re-checked
  24. Polk County Zoning Ordinance — Nonresidential and Communication-Tower Heights, quoted and re-checked
  25. Iowa Code 2026, Chapter 335 — County Zoning (Iowa statewide rule), quoted and re-checked
  26. legis.iowa.gov (Iowa statewide rule), quoted and re-checked
  27. Iowa Administrative Code Chapter 69, quoted and re-checked
  28. Iowa Administrative Code Chapter 69, quoted and re-checked
  29. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  30. Polk County Zoning Ordinance — Mobile Home Standards, quoted and re-checked
  31. Polk County Zoning Ordinance, quoted and re-checked
  32. Polk County Zoning Ordinance, quoted and re-checked
  33. Access Management (Iowa statewide rule), quoted and re-checked
  34. 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
  35. Share of land at 15% slope or less: Bolthole Index county data
  36. Polk County Zoning Ordinance, quoted and re-checked
  37. Private Well Construction Permits (Iowa statewide rule), quoted and re-checked
  38. Effective property tax rate: Bolthole Index county data
  39. Median property tax bill: Bolthole Index county data
  40. Farmland value per acre (USDA census): Bolthole Index county data

Written October 12, 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, Polk County has countywide zoning.

RulePolk CountyStory CountyDallas CountyJasper CountyBoone CountyWarren CountyMadison County
Building permitRequiredRequiredRequiredRequiredLimitedRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Env. Health ServicesCounty Env. Health Dept.County Env. Health Dept.County Community DevelopmentCounty Health & SanitationCounty Env. HealthCounty Env. Health

County locator

Polk County in Iowa

50
County map
Polk County highlighted among the Iowa counties · colored by Index score

How Polk County scores

Seclusion23100% ev.
Self-Sufficiency55100% ev.
Admin Boringness47100% ev.
Durability70100% ev.
Property Autonomy51100% ev.
Carry Cost56100% 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 →

$284kTypical home
1.8%Property tax
$9,677Land / acre
35.8"Annual rain
11.7% of yrsSevere drought
6.1 / yr (+5.4)Mid-century 100°F days
17 daysMid-century dry spell
1.87" (+9.7%)Mid-century 1-day rain
1.78×Wildfire change factor
100%Forward climate coverage
$1,579Home insurance / yr
3.3% / yrInsurance growth
1.08%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
633,283People within 30 min
2,010,520People within 2 hr
435,561Radius comparison (15 mi)
883People / sq mi
7.3%Federal land
95.4%Land at 15% slope or less
26.1%Soils rated "not limited" for septic (strict USDA rating)
86,339 acWorkable land screen
25.3%Wooded land
31.4 tonsBiomass / forest ac
49.8°FAvg temp

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Cities and towns in Polk 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: Alleman · Bondurant · Carlisle · Elkhart · Grimes · Johnston · Pleasant Hill · Runnells

Answers from the rulebook for Polk County

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

Polk County rules

  • Building permitRequired

    Construction, reconstruction, alteration, conversion, or structural change of buildings and structures in unincorporated Polk County.

    • The zoning ordinance also requires a permit before use or change of use of covered buildings, structures, or land.
    • The building permit becomes void six months after issuance if work has not started; if started, it is valid for one year, and becomes void if work ceases for more than six consecutive months.
    • A filing fee accompanies each application in an amount determined by the Board of Supervisors.

    permit commencement deadline: 6 months (If the project has not started) · permit validity after work starts: 1 year (If work has started) · work cessation expiration: > 6 consecutive months

    “before the issuance of a Building Permit”
    One more reviewed finding on this topic
    • Required — Construction covered by Polk County Building Services in unincorporated Polk County.
      “It shall be unlawful to locate, erect, or begin the construction, reconstruction, extension, conversion, or structural alteration of any building or structure, or to begin the excavation therefore or the construction of a well or sewage disposal system, other than the reconstruction, placement, or extension of any existing well or sewage disposal system, without first applying for a Building Permit thereof.”
  • Certificate of occupancyRequired

    Structures or premises newly created, erected, changed, converted, enlarged, or moved under the Polk County Zoning Ordinance.

    • No certificate is required for recurring maintenance work or installation of required improvements under an approved subdivision plat.
    • A temporary certificate may last no more than six months and requires additional safeguards and a signed agreement.
    • The certificate is issued only after inspection by necessary building, health, engineering, and zoning representatives.

    temporary certificate maximum duration: 6 months (Pending completion and subject to stated safeguards and agreement)

    “Certificate of Occupancy shall have been issued”
    One more reviewed finding on this topic
    • Required — Use or occupancy of structures or premises regulated by the Polk County Zoning Ordinance.
      “No person shall use or permit the use of any structure or premises or part thereof hereafter created, erected, changed, converted, enlarged or moved, wholly or partly, until a Certificate of Occupancy shall have been issued by the Zoning Administrator.”
  • County-wide zoningPresent (with conditions)

    Zoning regulation in unincorporated Polk County.

    • The ordinance is expressly scoped to unincorporated Polk County.
    • Incorporated municipalities may apply their own regulations.
    “The provisions of this Ordinance shall apply to the land within unincorporated Polk County.”
  • Local zoningPresent

    County zoning regulation of land within unincorporated Polk County.

    • The ordinance applies to unincorporated Polk County; incorporated municipalities may have separate zoning rules.
    “The provisions of this Ordinance shall apply to the land within unincorporated Polk County.”
  • Zoning districtsPublished (with conditions)

    Zoning districts and the official zoning map for unincorporated Polk County.

    • The ordinance divides unincorporated Polk County into zoning districts.
    • District boundaries are shown on the Official Zoning Map, which is incorporated into the ordinance.
    “Zoning districts established by this Ordinance are bounded and defined as shown on the Official Zoning Map of Polk County, which, together with all explanatory materials contained thereon, are hereby made a part of this Ordinance.”
  • Minimum lot sizeSpecified

    Minimum lot area varies by zoning district and development option in unincorporated Polk County.

    • Where septic tanks will be used, adequate soils are assumed.
    • Required water and sewer services vary by district and development option.

    minimum lot area: varies by district (Examples include 40,000 square feet in AG & AT single-family cluster, 40,000 square feet in RR single-family, 12,000 square feet in LDR single-family, and 8,500 square feet in MDR single-family.)

    “Minimum Lot Area is the smallest allowed lot size allowed for this zoning district and use.”
  • SetbacksDistrict specific (with conditions)

    Building setbacks under Polk County zoning districts and development options.

    • Setbacks vary by zoning district and development option.
    • The ordinance contains exceptions and permitted encroachments in required setbacks.

    example front setback: 25 ft. (detached townhouse planned-development table) · example side setback: 5 ft. (detached townhouse planned-development table) · example rear setback: 25 ft. (detached townhouse planned-development table)

    “The Table of Single Family Bulk Standards provides the standards that govern the construction of single-family dwelling units in single-family developments in the various Residential districts including Cluster Single Family Residential Bulk Standards.”
  • Lot coverageDistrict specific (with conditions)

    Maximum lot or building coverage under Polk County zoning districts and development options.

    • Coverage varies by zoning district and development option.
    • Accessory dwellings may not cause the lot-coverage requirement of the zone to be exceeded.

    example maximum building coverage: 0.4 ratio (detached townhouse planned-development table) · mobile-home-park maximum coverage: 0.43 ratio (without accessory building)

    “The accessory dwelling unit shall meet the setback requirements of the primary dwelling unit or accessory building setbacks and shall not cause the lot coverage requirement of the zone to be exceeded.”
  • Building heightDistrict specific (with conditions)

    Maximum building heights for nonresidential uses and commercial communication towers in unincorporated Polk County.

    • Nonresidential height varies by zoning district and use class.
    • Commercial communication towers must meet the Ankeny Regional Airport Tall Structures Zoning Ordinance.
    • Commercial communication towers must meet underlying-district setbacks and collapse-radius requirements.
    • Height limitations do not apply to listed structures such as communication towers, wind energy conversion systems, and similar structures, except as otherwise prohibited by airport height limitations, subject to other regulations.

    nonresidential maximum building height: AG/AT agricultural 135 ft; AG/AT commercial 45 ft; AG/AT ag support 135 ft; AG/AT all other 45 ft; ER 35 ft; RR 35 ft; LDR 35 ft; MDR 35 ft; HDR 40 ft; MU 45 ft; NB 30 ft; GC 35 ft; LI 45 ft; HI 45 ft; OS 35 ft ft · commercial communication tower maximum height in HI and LI: 350 ft (Except for ham and citizen band radios; airport height limitations and other stated regulations apply.) · commercial communication tower maximum height in GC and AT: 180 ft (Except for ham and citizen band radios; airport height limitations and other stated regulations apply.) · commercial communication tower maximum height in AG: no maximum stated (Airport height limitations and other stated regulations apply.)

    “The maximum height for a commercial communication tower in the HI District and LI District is 350'. The maximum height in the GC and AT Districts is 180'. There is no maximum height for commercial communications towers in the AG District.”
    2 more reviewed findings on this topic
    • District specific (with conditions) — Building-height limits under Polk County zoning districts and development options.
      “Except as otherwise prohibited by airport height limitations, the height limitations of this Ordinance shall not apply to:”
    • District specific (with conditions) — Maximum building heights for single-family residential development in unincorporated Polk County, by zoning district and development option.
      “Agricultural AG 35 ac 600 50 25 50 40 5% Agricultural Transition AT 35 ac 600 50 25 50 40 5% Estate Residential ER 3 ac 225 75 25 75 35 8% Rural Residential RR 40000 sf 140 50 15 50 35 15% Low Density Residential LDR 12000 sf 75 35 10 35 35 30% Medium Density MDR 8500 sf 60 30 8 30 35 40% High Density HDR 8500 sf 60 30 8 30 35 40% Mixed Use MU 8500 sf 60 30 8 30 35 40%”
  • Living in an RVTemporary only (with conditions)

    Use of an RV or camper as temporary shelter in unincorporated Polk County.

    • Maximum 21 days in a calendar year per property.
    • No more than 14 consecutive nights during any one stay.
    • Limited to one RV or camper at a time per property.
    • Health regulations and waste disposal requirements must be met.

    annual duration: <= 21 days (per property) · single-stay duration: <= 14 consecutive nights (per stay) · number of RVs or campers: 1 per property (at a time)

    “A recreational vehicle (RV’s) or camper may be used for temporary shelter in unincorporated Polk County for a period not to exceed twenty one (21) days in a calendar year and not more than fourteen (14) consecutive nights during any one stay.”
  • Camping on your landLimited

    Temporary camping or temporary shelter using an RV or camper in unincorporated Polk County.

    • The ordinance provision addresses RV or camper temporary shelter.
    • Maximum 21 days per calendar year per property.
    • Maximum 14 consecutive nights per stay.
    • One RV or camper at a time per property.
    • Health regulations and waste disposal requirements apply.

    annual duration: <= 21 days (per property) · single-stay duration: <= 14 consecutive nights (per stay)

    “A recreational vehicle (RV’s) or camper may be used for temporary shelter in unincorporated Polk County for a period not to exceed twenty one (21) days in a calendar year and not more than fourteen (14) consecutive nights during any one stay.”
  • Tiny homesProhibited

    Use of a portable tiny home as a standalone accessory dwelling unit on property governed by the Polk County Zoning Ordinance in unincorporated Polk County.

    • The ordinance permits no more than one accessory dwelling unit per property.
    • An accessory dwelling unit may not exceed 1,200 square feet of gross floor area, excluding garage, porch, or deck area, and may not be larger than the existing principal residence.
    • An accessory dwelling unit in an accessory building must be separated from the remainder of the accessory building and occupy no more than 50% of that structure.
    • The accessory dwelling unit must meet the primary dwelling or accessory-building setback requirements and may not cause the zone's lot-coverage requirement to be exceeded.
    • The property owner must reside on the property, with either the primary dwelling or ADU being the owner's legal residence as reflected in title records and evidenced by homestead tax credit.
    • The owner must provide a Polk County-acceptable covenant or deed restriction suitable for recording; specified exceptional circumstances may support an extension of that restriction for up to 12 months with Board of Adjustment approval.
    • The ADU must be architecturally compatible with the primary dwelling.
    • The ADU must provide an additional off-street parking space, comply with entrance-separation requirements if applicable, may not be separately sold or leased unless zoning and subdivision standards are met, and may not be located in a FEMA-mapped floodplain.
    • The ADU must meet applicable building codes and public water and wastewater requirements; connection to an existing onsite wastewater treatment system requires soil-engineer review and certification that the system can handle the design, or required system improvements/new construction.
    “(6) Use of a standalone structure; including stick-built house, manufactured home, single wide mobile home, travel trailer or recreational vehicle (RV), portable tiny home or other temporary/ portable structure as an accessory dwelling shall be not be permitted as an ADU.”
    2 more reviewed findings on this topic
    • Limited — Portable tiny homes used as standalone accessory dwellings in unincorporated Polk County.
      “Use of a standalone structure; including stick-built house, manufactured home, single wide mobile home, travel trailer or recreational vehicle (RV), portable tiny home or other temporary/ portable structure as an accessory dwelling shall be not be permitted as an ADU.”
    • Prohibited — A portable tiny home used as an accessory dwelling unit in unincorporated Polk County.
      “portable tiny home or other temporary/ portable structure as an accessory dwelling shall be not be permitted as an ADU.”
  • Manufactured homesLimited

    Mobile-home dwelling occupancy in unincorporated Polk County.

    • The use is permitted only within the Mobile Home Park Zoning District.
    • The Mobile Home Park District is mapped through the rezoning process.
    • The ordinance distinguishes mobile homes from other manufactured homes by locating the mobile-home unit within a subdivision designed specifically for mobile homes called a mobile home park.
    • The mobile-home park standards apply to both existing and new mobile home parks.
    • A site plan is required for any new or expanded mobile home park.
    • Travel trailers, campers, and recreational vehicles may not be used as a mobile home or dwelling within a mobile home park.

    mobile home park minimum lot area without accessory building: 4000 sq ft · mobile home park minimum lot area with accessory building: 5500 sq ft · mobile home maximum building height: 20 ft · mobile home park off-street parking: per 2 spaces per unit

    “This type of unit is distinguished from other manufactured homes in that it is located within a subdivision designed specifically for mobile homes called a mobile home park. This type of dwelling unit is permitted only within the Mobile Home Park Zoning District. This district is mapped only through the rezoning process.”
  • Subdividing landRegulated (with conditions)

    Subdivision and lot-configuration regulation under Polk County zoning controls.

    • Subdivision proposals must comply with applicable zoning-district minimum bulk regulations.
    • The ordinance requires open space on the portion of a lot larger than 40,000 square feet, except for boundary-line adjustments.

    open-space threshold: > 40000 sq. ft. (boundary-line adjustments)

    “The proposed lot configuration shall not create lot sizes that are less than the Cluster Development Option - Single Family Regulations for minimum bulk regulations as found in Table 6.1 for the zoning district that the parcel is located within.”
  • Driveway accessLimited

    Private roads and driveways serving principal structures in Polk County floodplain areas.

    • The requirement applies to vehicular access to a principal structure in the regulated floodplain context.
    • Access must support emergency and fire protection during flood events.

    elevation above 1% annual chance flood level: 1 foot

    “Vehicular access to any principal structure, by public roads, shall be elevated to a level which is one (1) foot above the 1% Annual Chance flood elevation and by private roads and driveways, it shall be elevated to a level which is one (1) foot above the 1% Annual Chance flood elevation, in order to ensure emergency and fire protection access during flood events.”
  • Building in a floodplainLimited

    Residential, nonresidential, utility, sanitary, and access development in regulated floodplain areas.

    • Residential lowest floors must be at least one foot above the 1% annual chance flood level.
    • Nonresidential structures must be elevated one foot above that level or floodproofed to that level.
    • On-site waste systems must avoid impairment or contamination during flooding.
    • Private roads and driveways must be elevated one foot above the 1% annual chance flood elevation.
    • Fill in excess of 500 cubic yards requires detailed fill plans.

    residential elevation above 1% annual chance flood level: >= 1 foot (Alternative elevation methods may be allowed subject to favorable consideration by the Iowa Department of Natural Resources.) · fill threshold: > 500 cubic yards (Detailed fill plans are required.)

    “All residential structures which are constructed or substantially improved after the date of adoption of this Ordinance shall have the lowest floor, including lowest level, elevated a minimum of one (1) foot above the 1% Annual Chance flood level.”
  • Permit feesVariable (with conditions)

    Polk County zoning and building permit processes in unincorporated Polk County.

    • The zoning ordinance states that filing fees are determined by the Board of Supervisors.
    • The county website identifies a 2026 Public Works Fee Schedule and states that beginning September 1, 2026, the county will no longer absorb credit-card and e-check payment fees through OpenGov.
    “A filing fee shall accompany each application for a Building Permit, in such amount as may be determined by the Board of Supervisors.”

Iowa rules that apply here

  • Owner-builder exemptionAvailable

    Iowa contractor-registration status for an owner performing work or having work performed on the owner’s own property, including residential property in Polk County.

    • This is a contractor-registration exemption; it does not establish an exemption from county building, zoning, septic, well, utility, or other permits.
    • The Iowa Code text also excludes persons earning less than $2,000 annually from the contractor definition.
    • Separate plumbing, mechanical, electrical, or other licensing requirements may still apply.

    annual earnings threshold: < 2000 USD (The statute separately excludes 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.”
    One more reviewed finding on this topic
    • Available (with conditions) — A person performing work or having work performed on the person's own property, for purposes of Iowa Code chapter 91C contractor registration.
      “However, a person who earns less than two thousand dollars annually or who performs work or has work performed on the person’s own property is not a contractor for purposes of this chapter.”
  • 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.”
  • 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.”
  • 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:”
  • Who permits septicMixed (with conditions)

    Statewide private sewage disposal regulation is shared between the Iowa Department of Natural Resources and county boards of health.

    • County boards of health must adopt and enforce standards at least as stringent as, and consistent with, commission standards.
    • The Department of Natural Resources retains concurrent authority and regulates direct discharges to waters of the state.
    • If a county board of health fails to fulfill its responsibilities, the department may exercise departmental authority.
    “Each county board of health shall regulate the private water supply and private sewage disposal facilities located within the county board’s jurisdiction, including the enforcement of standards adopted pursuant to this section.”
  • Septic permitRequired

    Installation or alteration of private sewage disposal systems (PSDSs) statewide in Iowa, including systems serving four homes or fewer or fewer than 15 people.

    • A construction permit issued by the administrative authority must be obtained before construction.
    • The administrative authority is the Iowa DNR or the local county board of health.
    • Local boards of health have primary responsibility for PSDSs serving four homes or fewer or fewer than 15 people; the Iowa DNR has primary responsibility for larger public systems.
    • Repair of existing PSDS components that does not change treatment or disposal of the waste is not considered an alteration, but discharge restrictions continue to apply.
    • When a publicly owned treatment works is available, or a local ordinance requires connection, a PSDS may not be installed, repaired, or rehabilitated; a POTW may be considered unavailable when it is more than 200 feet from the proposed building or exterior drainage facility, subject to the administrative authority’s final determination.
    • When a POTW is unavailable, every building where persons generate domestic sewage must be provided with an approved PSDS; a holding tank may be used only if all other PSDS options are impractical.
    • All constructed or altered PSDSs must comply with Chapter 69, and newly constructed systems require an administrative-authority final inspection before backfilling.
    • Systems discharging to designated waters of the state or subsurface drainage tile must comply with NPDES General Permit No. 4 and submit a Notice of Intent before use.

    POTW distance threshold: <= 200 feet (A POTW may be considered unavailable when it is more than 200 feet from the proposed building or exterior drainage facility.) · regulated residential scale: 4 homes or fewer or less than 15 people (Larger public systems are primarily regulated by the Iowa DNR.)

    “69.1(4) Construction permit required. No PSDS shall be installed or altered as described in 69.1(3)“b” unless a construction permit issued by the administrative authority is obtained prior to construction. PSDS installation shall be in accordance with these rules.”
    One more reviewed finding on this topic
    • Required — Installation or alteration of onsite wastewater treatment and disposal systems in Iowa, including Polk County unless a more specific applicable rule applies.
      “No onsite wastewater treatment and disposal system shall be installed or altered as described in 69.1(3)“c,” until an application for a permit has been submitted and a permit has been issued by the administrative authority.”
  • 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.”
  • Well permitRequired

    Construction of private water-supply wells statewide in Iowa, including household, livestock, commercial, processing, irrigation, recreational, industrial, monitoring, dewatering, and related wells identified by the Iowa DNR.

    • A private well construction permit is required for all water-supply wells.
    • For private water-supply wells serving fewer than 25 individuals or fewer than 15 water-service connections, permits are issued by local county health departments, except Osceola County, which lacks authority to issue private well construction permits; the Iowa DNR handles permitting there.
    • The applicant must submit an application and county application fee; each county sets its own fee.
    • The county reviews completeness and location relative to contamination sources and issues or denies the permit in writing before construction proceeds.
    • The county and DNR must be allowed to visit the proposed well site before, during, and after construction.
    • Public water-supply wells serving 25 or more individuals or having 15 or more water-service connections require a Public Water Supply Construction Permit issued by Iowa DNR Water Supply Engineering; county private-well programs cannot issue those permits.
    • Private well permits are not required for geotechnical borings without well casing or screens, Geoprobe-style boreholes without temporary or permanent casing, and cathodic-protection wells.
    • Trench dewatering does not require a private well construction permit.
    • Separate water-allocation, NPDES, floodplain, or underground-injection permits may also be required depending on the project.

    public water supply threshold: >= 25 individuals served (A public-water-supply construction permit is also required at 15 or more water-service connections.) · public water supply threshold: >= 15 water-service connections (A public-water-supply construction permit is also required when 25 or more individuals are served.) · geothermal loop depth threshold: >= 20 feet (Closed-loop and open-loop geothermal systems at or beyond this depth require a private well construction permit.)

    “Private Well Construction Permits are required for all water supply wells, and for all geothermal systems - closed-loop and open-loop - that are 20 feet or greater in depth.”
  • Mandatory utility hookupConditional

    Connection of buildings to public sanitary sewer where available.

    • A public sewer may be considered unavailable when it or connected facilities are more than 200 feet from the proposed building or exterior drainage facility on an abutting lot.
    • When a public sewer becomes available within 200 feet, connection is required within the timeframe or under conditions set by the administrative authority.
    • When public sewer is unavailable, every building where persons reside, congregate, or are employed must have an approved onsite wastewater system.

    public sewer availability distance: <= 200 feet (The administrative authority makes the final availability determination.)

    “When a public sanitary sewer becomes available within 200 feet, any building then served by an onsite wastewater treatment and disposal system shall connect to said public sanitary sewer within a time frame or under conditions set by the administrative authority.”
  • 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”
  • Permit processPartial

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

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

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

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

  • Off-grid sanitation — Off-grid sanitation arrangements in Polk County.
  • Short-term rentals — Short-term rentals in unincorporated Polk 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 Polk County, Iowa

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

Polk County scores 50/100 on the Bolthole Index, a solid county profile. Its strengths: mixed durability signals. Watch-outs: about 633,283 people within a 30-minute drive.

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

Polk County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Polk County Environmental Health Services (under Iowa DNR). 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 Polk County?

Living in an RV on your own land in Polk County is allowed on a temporary basis only: Use of an RV or camper as temporary shelter in unincorporated Polk County. Maximum 21 days in a calendar year per property. No more than 14 consecutive nights during any one stay. A tiny home is prohibited. Confirm with the county before relying on it.

How much does land cost in Polk County, Iowa?

Land in Polk County runs about $9,677 per acre, based on the latest county data.

What is the water situation in Polk County?

Polk County gets about 35.8" of rain a year, with severe drought in roughly 11.7% of years.

How remote is Polk County?

A representative private-land location has about 633,283 people within a 30-minute drive and 2,010,520 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 Polk compares in Iowa

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