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 before covered construction begins1. County zoning also controls the parcel's allowed use, setbacks, lot coverage and eventual occupancy2345. Septic permits go through Polk County Environmental Health Services everywhere except the City of Des Moines6.

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 standards27
Septic permit
Required countywide except inside Des Moines; issued by Polk County Environmental Health Services6
RV living
Temporary shelter only: one RV or camper per property, up to 21 days per calendar year and 14 consecutive nights per stay8
Portable tiny home
Not permitted as a standalone accessory dwelling unit9
Owner-builder
State contractor-registration law excludes work on your own property, but county permits and inspections still apply101
Certificate of occupancy
Required before a newly created, changed, enlarged or moved structure or premises is used or occupied5
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

[email protected]

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

[email protected]

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

[email protected]

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 September 29, 2026.

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

Unincorporated Polk County, Iowa requires a building permit before covered construction, reconstruction, extension, conversion, structural alteration or excavation begins1. Polk County Building Services reviews plans, issues permits and inspects construction in the unincorporated county; examples include decks, pools, new houses, additions, storage facilities and fuel tanks12. A filing fee must accompany each building-permit application, with the amount set by the Board of Supervisors11. Before using or occupying a newly created, erected, changed, converted, enlarged or moved structure or premises, the owner must obtain a certificate of occupancy from the Zoning Administrator after the required site inspection5. Iowa contractor-registration law does not treat a person working on their own property as a contractor, but that exclusion does not waive Polk County's permit, code, inspection or occupancy requirements1015.

Who handles building, zoning and septic questions in Polk County, and how do you reach them?

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 pm1213. 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 addressing13. Septic systems are a separate division again: Polk County Environmental Health Services, also at 515-286-3705 or [email protected], issues septic and well permits and reviews Time of Transfer inspection reports for unincorporated Polk County outside the City of Des Moines14.

Does Polk County have zoning?

Polk County's zoning ordinance applies throughout unincorporated Polk County and divides that land into districts with different use and dimensional standards27. Minimum lot area, setbacks and maximum lot coverage therefore depend on the parcel's district, use and development option rather than one countywide number1534. Planning & Zoning Services administers the zoning map, subdivision standards and FEMA floodplain rules, so ask that office for the parcel's district and overlays before designing a house or accessory building13. Iowa's county-zoning statute generally exempts qualifying agricultural land and structures while used for farming, although floodplain regulation can still apply16. Iowa also requires a county to allow at least one accessory dwelling unit on a qualifying single-family lot, subject to state conditions, but Polk County does not permit a portable tiny home or other temporary or portable standalone structure to serve as that ADU179.

How do septic permits work in Polk County?

Septic systems in unincorporated Polk County are permitted and inspected by the county's Environmental Health Services division, covering the whole county except the City of Des Moines614. 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 one14. Polk County's own ordinance bars aerobic treatment units outright, so if your soils are marginal, plan around a conventional or engineered gravity system instead of an ATU14. 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 inspection18.

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

An RV or camper may serve only as temporary shelter in unincorporated Polk County: no more than one 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 apply8. That temporary allowance does not support full-time RV residence. Polk County also prohibits using a portable tiny home, travel trailer, RV, mobile home or other temporary or portable standalone structure as an accessory dwelling unit9. A code-compliant ADU remains possible under Iowa law on a qualifying single-family lot, but it must satisfy applicable building rules, and a manufactured or mobile unit used as the ADU must be placed on a permanent foundation and converted to real property17. A manufactured primary home likewise cannot be rejected solely because it is manufactured, but it must meet the foundation, setback and minimum-size standards applicable to a site-built home on the same lot19.

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

  1. Contact Polk County Planning & Zoning Services at 515-286-3705 to identify the parcel's zoning district, allowed use, setbacks, lot coverage and any floodplain overlay13734.
  2. Confirm that the lot area and proposed layout meet the standards for that district and development type15.
  3. Apply to Building Services before starting covered construction and include the filing fee set by the Board of Supervisors111.
  4. If the site lacks public sewer, obtain the septic permit through Environmental Health Services and use a county-licensed contractor for installation, alteration or repair14.
  5. Call 515-286-3705 for required building inspections as work progresses; the permit holder or representative must request them12.
  6. Obtain the certificate of occupancy from the Zoning Administrator after the required site inspection and before using or occupying the completed structure5.
  7. If the driveway connects to an Iowa primary highway, obtain Iowa DOT approval before work begins20.

What to check before you buy land in Polk County, Iowa

If the home you're buying is on a septic system, Iowa law requires a DNR-certified inspection before the sale can close, and Polk County Environmental Health Services reviews that report, so ask for it early1814. Septic soils are middling here: 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 outright, so a marginal site may need real engineering2114. The land is mostly gentle: about 95.4% sits at 15% slope or less, which is friendly for building but also means less natural drainage relief, so ask Planning & Zoning about floodplain status before you buy near water2213. Polk County also carries a real share of federal or other public land, about 7.3% of the county, so check whether a rural parcel borders public land before you count on privacy or access23. Property taxes run moderate for a metro county: about 1.8% effective, with a median bill around $4,364 a year, while farmland has recently valued around $9,677 an acre242526.

Watch-outs

  • Polk County Building Services, Planning & Zoning Services and Environmental Health Services all share one phone number, 515-286-3705, but are different divisions issuing different permits; say clearly whether you need a building permit, zoning or a septic permit when you call121314.
  • 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 allow14.
  • An RV or camper is limited to temporary shelter 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 property8.
  • A portable tiny home cannot be used as a standalone accessory dwelling unit in unincorporated Polk County9.

Sources

  1. Building Services - Polk County Iowa, quoted and re-checked
  2. Polk County Zoning Ordinance, quoted and re-checked
  3. Polk County Zoning Ordinance, quoted and re-checked
  4. Polk County Zoning Ordinance, quoted and re-checked
  5. Polk County Zoning Ordinance, quoted and re-checked
  6. Polk County Environmental Health Services (2026 county census)
  7. Polk County Zoning Ordinance, quoted and re-checked
  8. Polk County Zoning Ordinance, quoted and re-checked
  9. Polk County Zoning Ordinance — Unincorporated Polk County, Iowa, quoted and re-checked
  10. Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
  11. Polk County Zoning Ordinance, quoted and re-checked
  12. Polk County Building Services (polkcountyiowa.gov)
  13. Polk County Planning & Zoning Services (polkcountyiowa.gov)
  14. Polk County Environmental Health Services (polkcountyiowa.gov)
  15. Polk County Zoning Ordinance, quoted and re-checked
  16. Iowa Code 2026, Chapter 335 — County Zoning (Iowa statewide rule), quoted and re-checked
  17. Senate File 2369 — Enrolled (Iowa statewide rule), quoted and re-checked
  18. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  19. Iowa Code §335.30, Manufactured and modular homes (Iowa statewide rule), quoted and re-checked
  20. Access Management (Iowa statewide rule), quoted and re-checked
  21. Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
  22. Share of land at 15% slope or less: Bolthole Index county data
  23. Federal land share: Bolthole Index county data
  24. Effective property tax rate: Bolthole Index county data
  25. Median property tax bill: Bolthole Index county data
  26. Farmland value per acre (USDA census): Bolthole Index county data

Written September 29, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Found land here? Start a Property Hunt →

County locator

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%Septic soil without severe limits
86,339 acWorkable land screen
25.3%Wooded land
31.4 tonsBiomass / forest ac
49.8°FAvg temp

Scout Polk County

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

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

Property hunt

Find land. Bring the promising ones back.

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

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

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

Analyze a property
Add setup-cost allowances

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

Working estimate

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

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

Before an offer

Parcel due diligence

0/8 checked

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

Answers from the rulebook for 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 covered by Polk County Building Services in unincorporated Polk County.

    • Required permits can range from decks and pools, new houses, and house additions to factories, storage facilities, and chemical/fuel tanks.
    • The source states that requirements may differ within incorporated municipalities.
    “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

    Use or occupancy of structures or premises regulated by the Polk County Zoning Ordinance.

    • No certificate is required for recurring maintenance work or installation of required improvements according to an approved subdivision plat.
    • A temporary certificate may be issued for up to six months.
    • The certificate is issued by the Zoning Administrator after required site inspection.

    temporary certificate duration: <= 6 months (pending completion and subject to conditions)

    “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 applies to land within unincorporated Polk County; incorporated cities administer their own zoning rules.
    “The provisions of this Ordinance shall apply to the land within unincorporated Polk County.”
  • Zoning districtsPublished (with conditions)

    Zoning districts and district-specific dimensional and use standards in unincorporated Polk County.

    • The ordinance divides the unincorporated area into districts and contains district tables and a zoning map.
    • Applicable standards vary by district and development option.
    “The unincorporated areas of Polk County, Iowa are hereby divided into zoning districts of such number and character as are necessary to achieve compatibility of uses within each district; to implement the Polk 2030 Comprehensive Land Use Plan; and to achieve the objectives of this Ordinance.”
  • Minimum lot sizeSpecified

    Specific zoning districts and development options in unincorporated Polk County, including planned developments and mobile home parks.

    • Dimensional standards vary by zoning district, use, and development option.
    • Examples include 4,000 square feet or 5,500 square feet for mobile-home-park lots and 5,000 square feet for conservation houses in planned developments.

    mobile-home-park minimum lot area: 4,000–5,500 square feet (depending on accessory building) · conservation-house minimum lot area: 5000 square feet (planned development) · detached-townhouse minimum lot area: 4000 square feet (planned development)

    “A = Minimum Lot Area 4000 sf [...] A = Minimum Lot Area 5,000 [...] A = Minimum lot area 4,000 sq. ft. 5,500 sq. ft.”
  • SetbacksSpecified

    Setbacks in specified zoning districts and development options in unincorporated Polk County.

    • Setbacks vary by zoning district, use class, street classification, and development option.
    • Both minimum peripheral setback and standard setback may be required when adjacent to a different zoning district or development option.
    • Specific exceptions permit limited encroachments, including uncovered porches and egress window wells.
    “All nonresidential uses shall comply with the following minimum bulk requirements. Side and rear yard setbacks are calculated by using the minimum peripheral setback plus the minimum standard side and rear yard setback.”
  • Lot coverageSpecified

    Lot coverage standards in specified zoning districts and development options in unincorporated Polk County.

    • Lot coverage varies by zoning district and use.
    • For certain mobile-home-park standards, maximum building coverage is 0.43 without an accessory building and 0.37 with an accessory building.
    • For conservation houses in planned developments, maximum building coverage is 0.60.

    mobile-home-park maximum building coverage: 0.37–0.43 fraction of lot (depending on accessory building) · conservation-house maximum building coverage: 0.6 fraction of lot (planned development)

    “B = Maximum Building Coverage .60 [...] B = Maximum building coverage .43 .37”
  • Living in an RVLimited

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

    • Use is limited to one RV or camper at a time per property.
    • Use may not exceed 21 days in a calendar year and 14 consecutive nights during any one stay.
    • Health regulations and disposal of waste must be met.
    • The ordinance states this accommodates traveling visitors.

    calendar-year limit: <= 21 days (per property) · single-stay limit: <= 14 consecutive nights (per stay) · RVs or campers: 1 per property (at one 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. This is to accommodate traveling visitors. The following additional requirements must be met: 1) Health regulations and disposal of waste must be met. 2) Limited to one RV or camper at a time per property. 3) The twenty one (21) days in a calendar year are per property.”
  • Camping on your landLimited

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

    • The source regulates RV/camper temporary shelter rather than all forms of camping.
    • Maximum 21 days per calendar year and 14 consecutive nights per stay.
    • One RV or camper per property at a time.
    • Health and waste-disposal rules apply.

    calendar-year limit: <= 21 days (per property) · single-stay limit: <= 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.”
    One more reviewed finding 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.”
  • 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 (with conditions)

    A person performing work or having work performed on the person's own property, for purposes of Iowa Code chapter 91C contractor registration.

    • The exemption is from being treated as a contractor for purposes of chapter 91C; it is not stated to waive building permits, building-code compliance, inspections, or certificates of occupancy.
    • The separate annual-earnings threshold is less than $2,000, but the own-property exemption is stated independently.
    • A contractor doing business in Iowa must register under chapter 91C unless an applicable statutory exclusion applies.
    “However, a person who earns less than two thousand dollars annually or who performs work or has work performed on the person’s own property is not a contractor for purposes of this chapter.”
  • Building code adoptedPartial

    The Iowa State Building Code, including the 2024 International Building Code adopted by reference with Iowa amendments, applies statewide to state-owned buildings and structures, qualifying state-funded construction, certain cities over 15,000 that lack a substantially equivalent local building code, and governmental subdivisions that accept the code by ordinance. Factory-built-structure provisions apply throughout Iowa.

    • In a governmental subdivision, the code generally applies only after the governing body enacts an ordinance accepting applicability and files a certified copy with the commissioner.
    • The local ordinance fixes the effective date, which must be no more than six months after adoption.
    • A governmental subdivision may withdraw after one year by ordinance, following the required public hearing and written notice; the withdrawal date must be at least 180 days after ordinance adoption, and previously issued permits are unaffected.
    • The state building code applies to state-owned buildings and structures and to newly constructed buildings and structures paid for in whole or in part with state-appropriated money but not wholly state-owned.
    • Cities with populations over 15,000 that lack a local building code substantially in accord with nationally recognized standards must enforce the state building code.
    • Factory-built-structure provisions apply throughout the state; an approved factory-built structure is deemed compliant with building regulations applicable to its manufacture and installation and is exempt from other state or local building regulations, subject to the statutory exceptions concerning professional engineering and architecture and manufactured homes.
    • The current administrative rule adopts the 2024 International Building Code by reference with amendments; detached one- and two-family dwellings, certain townhouses not more than three stories, and their accessory structures instead comply with the amended International Residential Code.

    adopted model building code: 2024 International Building Code (Adopted by reference with Iowa amendments.) · current administrative-rule effective date: 2025-09-10 (Iowa Administrative Code Chapter 481.301 source identifies ARC 9474C as effective September 10, 2025.) · local ordinance effective-date limit: <= 6 months after adoption · local withdrawal waiting period: >= 1 year after code became applicable (A governmental subdivision may withdraw only after this period has elapsed.) · withdrawal effective-date minimum: >= 180 days after ordinance adoption (Previously issued permits remain unaffected.)

    “The state building code shall be applicable: [...] In each governmental subdivision where the governing body has enacted an ordinance accepting the application of the code.”
  • InspectionsLimited

    Buildings and structures subject to Iowa Code section 103A.10A, including newly constructed state-owned buildings, state-board-of-regents buildings, and certain state-funded buildings.

    • Newly constructed state-owned buildings and structures subject to the state building code are subject to plan review and inspection, excluding renovations and repairs except as provided by statute.
    • Newly constructed buildings owned by the state board of regents are subject to plan review and inspection, excluding renovations and repairs except as provided by statute.
    • State-funded buildings not wholly owned by the state are subject to state plan review and inspection when the governmental subdivision has not adopted the listed codes or does not perform inspections; otherwise they must comply with the local codes and inspections.
    • For ordinary privately owned construction, inspection administration is governed by the applicable local law or ordinance.
    “All newly constructed buildings or structures subject to the state building code, including any addition, but excluding any renovation or repair of such a building or structure, owned by the state or an agency of the state, except as provided in subsection 2, shall be subject to a plan review and inspection by the commissioner or an independent building inspector appointed by the commissioner.”
  • Manufactured homesAllowed (with conditions)

    Placement and residential occupancy of manufactured homes under county zoning statewide in Iowa

    • A county may not disallow the proposed residential structure solely because it is a manufactured home.
    • The home must be located and installed under the same standards applicable to a site-built single-family dwelling on the same lot, including permanent foundation, setback, and minimum square footage standards.
    • The home must be assessed and taxed as a site-built dwelling.
    • A county may not require an incompatible perimeter foundation system and may not require more than one permanent foundation system.
    • Outside a manufactured home community or mobile home park, requirements may ensure visual compatibility of the permanent foundation system with surrounding residential structures.
    • Recorded restrictive covenants are not abrogated.
    • Counties may regulate transportation, water, sewerage, and other land development; the statute also bars width standards greater than twenty-four feet and certain design standards when federal standards are met.

    maximum mandated width standard: <= 24 feet (if the housing otherwise complies with 42 U.S.C. §5403)

    “A county shall not adopt or enforce zoning regulations or other ordinances which disallow the plans and specifications of a proposed residential structure solely because the proposed structure is a manufactured home. However, a zoning ordinance or regulation shall require that a manufactured home be located and installed according to the same standards, including but not limited to a permanent foundation system, set-back, and minimum square footage, which would apply to a site-built, single family dwelling on the same lot, and shall require that the home is assessed and taxed as a site-built dwelling.”
  • Accessory dwellingsAllowed (with conditions)

    City regulation of accessory dwelling units statewide in Iowa, within a zoning district where a single-family residence is an allowed principal use

    • At least one accessory dwelling unit must be allowed on the same lot as a single-family residence.
    • The accessory dwelling unit must comply with applicable building regulations under chapter 103A.
    • The unit may not exceed 1,000 square feet or 50 percent of the size of the single-family residence, whichever is larger; unfinished basements are excluded from the size calculation.
    • Historic-building-code restrictions, deed restrictions, and common-interest-community rules may limit or prohibit construction or use.
    • A manufactured or mobile home used as the accessory dwelling unit must be converted to real property by placement on a permanent foundation and assessed for real-estate taxes under section 435.26.
    • A historic-preservation area may regulate the unit to the extent the city or commission determines it incongruous and records its reasons.
    • Effective July 1, 2026.

    maximum accessory dwelling unit size: 1,000 square feet or 50% of the single-family residence, whichever is larger (unfinished basements excluded from the size calculation)

    “A city shall allow a minimum of one accessory dwelling unit on the same lot as a single family residence within a zoning district where a single family residence is an allowed principal use, in accordance with the following conditions:”
    One more reviewed finding on this topic
    • Allowed (with conditions) — County regulation of accessory dwelling units statewide in Iowa, within a zoning district where a single-family residence is an allowed principal use
      “A county shall allow a minimum of one accessory dwelling unit on the same lot as a single family residence within a zoning district where a single family residence is an allowed principal use, in accordance with the following conditions:”
  • 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 inspectionRequired

    Private sewage disposal systems serving buildings with one through four dwelling units, before qualifying ownership transfers statewide.

    • Inspection is required before transfer of ownership, including seller-financed real estate contracts.
    • The county recorder may not record the deed or conveyance document without a certified inspector report, unless weather or temporary physical conditions prevent inspection and the buyer executes a binding acknowledgment.
    • The requirement applies to sale, exchange, real estate contract, or other purchase of real estate and improvements.
    • Exceptions include specified court-ordered, foreclosure-related, fiduciary, family, demolition, recently installed system, partition, tax-sale, low-consideration, and qualifying family-entity transfers.
    • The septic tank must be opened and pumped at inspection, unless evidence shows it was properly pumped within three years before inspection by a licensed commercial septic tank cleaner.
    • A failing system must be renovated; a properly treating system without an unsanitary condition need not meet current construction standards.
    • Only a department-certified inspector may conduct the inspection.
    • An inspection is valid for two years for ownership transfers during that period.

    dwelling units: 1-4 · inspection validity: 2 years (for ownership transfers during that period) · prior septic pumping evidence: <= 3 years (must be by a department-licensed commercial septic tank cleaner) · civil penalty for fraudulent report: 5000 USD (and certification suspension for one year)

    “If a building where a person resides, congregates, or is employed is served by a private sewage disposal system, the sewage disposal system serving the building shall be inspected prior to any transfer of ownership of the building.”
  • Permit processPartial

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

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

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

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

Still unanswered

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

  • Minimum dwelling size — Minimum dwelling size in unincorporated Polk County.
  • Off-grid sanitation — Off-grid sanitation systems in Polk County.
  • Short-term rentals — Short-term rental use 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 limited to specific cases: Use of an RV or camper for temporary shelter in unincorporated Polk County. Use is limited to one RV or camper at a time per property. Use may not exceed 21 days in a calendar year and 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.

Off-grid gear

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

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

How Polk compares in Iowa

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