Bolthole Index

Tama County, Iowa

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

58Index Score / 100
#37 of 99 in Iowa

Unincorporated Tama County, Iowa requires a Building Permit/Zoning Certificate before most construction, moving or structural alteration, including accessory buildings larger than 120 square feet1. The county has zoning outside city limits but has not adopted building-code regulations there23. Private septic systems and water supplies need separate county permits45.

At a glance

Building permit
A Building Permit/Zoning Certificate is required for most building work1
Building code
Tama County has not adopted building-code regulations3
Zoning
County zoning applies outside city limits; cities have separate rules26
Septic permit
Required for a new private septic system4
Private well
A county well permit is required for new construction using a private supply5
Owner-builder
Own-property work is exempt from state contractor registration, not local permits7
RV or tiny-home living
No general county occupancy rule could be confirmed; ask Zoning8

Who to call

Zoning

Tama County Zoning Office

Zoning certificates, site-plan and setback review, subdivision questions, and floodplain development permits

(641) 654-7045

lwilson@tamacounty.org

129 W. High Street, Toledo, IA 52342

Septic permits

Tama County Sanitarian

Private septic-system permits and questions, site analysis, soil sampling, well testing and well plugging

641-481-3550

cbehrens@tcph.tamacountyiowa.gov

South Annex Building, 129 W. High St., Toledo, IA 52342

Contact details are copied from each office’s official page and were checked against it on October 3, 2026.

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

Yes—on land under Tama County zoning, a Building Permit/Zoning Certificate must be obtained before erecting, constructing, moving in or structurally altering a building or structure1. An accessory building triggers the certificate requirement when it is larger than 120 square feet1. The application requires a dimensioned lot drawing and site plan, and the applicant must give 48 hours' notice before construction begins9. The county may inspect during construction when the Administrative Officer considers an inspection necessary10. Tama County has not adopted building-code regulations for its unincorporated zoning jurisdiction, which is different from saying no county approval is required3. Iowa's state code still applies to the particular state-owned, state-funded, locally adopted and factory-built construction covered by state law11.

Who handles building and zoning permits in Tama County?

The Tama County Zoning Office is the first stop for a Building Permit/Zoning Certificate, zoning-district questions, setbacks, subdivisions and floodplain review8. The office is at 129 W. High Street in Toledo and can be reached at (641) 654-7045 or lwilson@tamacounty.org8. A completed certificate application is issued or denied within seven days; without an extension, a certificate can lapse if substantial construction has not begun within 90 days9. Certificate fees are based on project value, begin with a $60 minimum, and double if construction starts before the permit is issued12. County subdivision rules apply to land divisions, and a plat is required when an original parcel is divided into three or more lots for sale, transfer or development13.

Does Tama County have zoning?

Tama County zoning applies to land and structures outside city corporate limits; incorporated cities can have separate municipal zoning rules26. The county ordinance uses agricultural, residential, commercial and industrial districts, so permitted uses and dimensional controls depend on the parcel's mapped district14. Iowa law generally makes county zoning inapplicable to qualifying agricultural land and structures while they remain primarily adapted to agricultural purposes, except for specified floodplain controls15. Tama County's materials did not establish a general minimum dwelling size, general lot-coverage limit or county-specific farm exemption; ask the Zoning Office how the current ordinance applies to the parcel and proposed use8.

How do septic permits work in Tama County?

Tama County Environmental Health administers local private-wastewater permitting and inspections under county and Iowa requirements16. A new private septic system needs a county septic permit4. Contact the Tama County Sanitarian at 641-481-3550 before fixing a house location, because the office coordinates site analysis and soil sampling for septic installations17. Only about 0.6% of Tama County soils are rated without severe limitations for a conventional drain field, so the site evaluation can materially affect the system design and budget18. Iowa requires a time-of-transfer inspection for covered private systems serving buildings with one through four dwelling units, subject to statutory exceptions, and an inspection remains valid for two years for transfers during that period19. New construction using a private water supply needs a separate well permit5.

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

We could not confirm a general rule allowing private-lot or long-term RV occupancy or a tiny-home-specific occupancy rule in unincorporated Tama County; ask the Zoning Office about the parcel's district, duration and sanitation plan8. A small structure is not automatically exempt from land-use review: the county requires a zoning certificate for buildings and structures generally, with a stated size threshold only for accessory buildings larger than 120 square feet1. The county's R-1 district permits qualifying single-family and manufactured houses, while mobile-home parks are governed separately in the R-4 district20. An owner working on the owner's own property is outside Iowa's contractor-registration definition, but that exemption does not erase zoning certificates, septic permits or other applicable approvals7.

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

  1. Confirm that the parcel is outside city limits, then ask the Tama County Zoning Office for its mapped district, permitted use and setbacks68.
  2. Obtain an E911 address before the county issues the Building Permit/Zoning Certificate1.
  3. Submit the written application, legal description and dimensioned site plan, then pay the fee before work starts9.
  4. If the home will use private wastewater or water, arrange septic and well permits with Environmental Health and the Tama County Sanitarian4517.
  5. If the parcel lies in mapped Zone A, obtain a floodplain development permit before development21.
  6. If access connects to an Iowa primary highway, obtain Iowa DOT district approval before driveway work begins22.
  7. Give the county 48 hours' notice before construction begins and allow any inspection the Administrative Officer considers necessary10.

What should you check before buying land in Tama County?

First determine whether county or city zoning applies, then confirm the mapped district, permitted use, setbacks and any conditional-use process before making the purchase contingent-free614. Check the flood map because development of farm and non-farm property in mapped Zone A needs a floodplain permit21. Test septic feasibility early: only about 0.6% of county soils are rated without severe limitations for a conventional drain field18. For access onto an Iowa primary highway, state district approval must come before entrance work starts22. Tama County's effective property-tax rate is about 1.4%, with a median annual bill of about $1,945, while the typical home value is about $175,936232425.

Watch-outs

  • Unincorporated Tama County has not adopted building-code regulations, but it still requires a Building Permit/Zoning Certificate for most building work31.
  • Starting construction before the zoning certificate is issued doubles the certificate fee12.
  • Only about 0.6% of Tama County soils are rated without severe limits for a conventional drain field, so settle septic feasibility before committing to a homesite18.
  • County zoning applies outside city limits; property inside an incorporated city may be subject to different municipal rules6.
  • We could not confirm general RV-occupancy, tiny-home or minimum-dwelling-size rules for unincorporated Tama County; ask the Zoning Office about the proposed parcel and use8.

Sources

  1. Zoning Permit - Zoning Department - Tama County, Iowa, quoted and re-checked
  2. Zoning Ordinances - Zoning Department - Tama County, Iowa, quoted and re-checked
  3. Zoning Permit - Zoning Department - Tama County, Iowa, quoted and re-checked
  4. Zoning Permit - Zoning Department - Tama County, Iowa, quoted and re-checked
  5. Zoning Permit - Zoning Department - Tama County, Iowa, quoted and re-checked
  6. Communities - About - Tama County, Iowa, quoted and re-checked
  7. Iowa Code 2026, Chapter 91C — Construction Contractors (Iowa statewide rule), quoted and re-checked
  8. Tama County Zoning Office (tamacounty.iowa.gov)
  9. 1998 Tama County Zoning Ordinance, quoted and re-checked
  10. 1998 Tama County Zoning Ordinance, quoted and re-checked
  11. Building Code Plan Review (Iowa statewide rule), quoted and re-checked
  12. Fee Schedule - Zoning Department - Tama County, quoted and re-checked
  13. Subdivisions - Zoning Department - Tama County, quoted and re-checked
  14. 1998 Tama County Zoning Ordinance, quoted and re-checked
  15. Iowa Code 2026, Chapter 335 — County Zoning (Iowa statewide rule), quoted and re-checked
  16. Septic System - Sanitarian Department - Tama County, quoted and re-checked
  17. Tama County Sanitarian (tamacounty.iowa.gov)
  18. 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
  19. Iowa Code §455B.172, Jurisdiction of department and local boards (Iowa statewide rule), quoted and re-checked
  20. 1998 Tama County Zoning Ordinance, quoted and re-checked
  21. Floodplain Management - Zoning - Tama County, quoted and re-checked
  22. Access Management (Iowa statewide rule), quoted and re-checked
  23. Effective property tax rate: Bolthole Index county data
  24. Median property tax bill: Bolthole Index county data
  25. Typical home value (Zillow): Bolthole Index county data

Written October 3, 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

Unlike 5 of its 6 neighbors, Tama County requires a building permit only in limited cases.

RuleTama CountyPoweshiek CountyMarshall CountyBenton CountyGrundy CountyIowa CountyJasper County
Building permitLimitedRequiredRequiredNot requiredRequiredLimitedRequired
County zoningYesYesYesYesYesNoYes
Septic permitsCounty SanitarianCounty SanitarianCounty Env. HealthCounty Dept. of Env. HealthCounty SanitarianIA County Env. Health Dept.County Community Development

County locator

Tama County in Iowa

58
County map
Tama County highlighted among the Iowa counties · colored by Index score

How Tama County scores

Seclusion57100% ev.
Self-Sufficiency37100% ev.
Admin Boringness61100% ev.
Durability50100% ev.
Property Autonomy51100% ev.
Carry Cost59100% ev.

Evidence strength: 100%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$176kTypical home
1.4%Property tax
$9,563Land / acre
36.5"Annual rain
11.9% of yrsSevere drought
4 / yr (+3.8)Mid-century 100°F days
17 daysMid-century dry spell
1.87" (+11.8%)Mid-century 1-day rain
1.86×Wildfire change factor
100%Forward climate coverage
$1,613Home insurance / yr
2.8% / yrInsurance growth
0.98%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
13,163People within 30 min
1,798,342People within 2 hr
18,364Radius comparison (15 mi)
23.3People / sq mi
1.6%Federal land
85.2%Land at 15% slope or less
0.6%Soils rated "not limited" for septic (strict USDA rating)
2,701 acWorkable land screen
7.2%Wooded land
55.8 tonsBiomass / forest ac
47.9°FAvg temp

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Cities and towns in Tama 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: Chelsea · Clutier · Dysart · Elberon · Garwin · Gladbrook · Lincoln · Montour · Tama · Traer · Vining

Answers from the rulebook for Tama County

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

Tama County rules

  • Building permitLimited

    New construction, repairs, erection, moving in, or structural alteration of buildings and structures in county zoning jurisdiction.

    • A zoning certificate is required before covered construction; accessory buildings require one when larger than 120 square feet.
    • An E911 address must be issued before issuance of a building permit.
    • Private septic or water supply requires separate septic and well permits.

    accessory-building threshold: > 120 square feet (Accessory buildings at or below 120 square feet are not stated on this page to require a zoning certificate.)

    “A Zoning Certificate shall be obtained from the Administrative Officer before starting or proceeding with the erection, construction, moving in or the structural alteration of a building or structure. Accessory buildings shall require a Zoning Certificate if the structure is larger than 120 square feet.”
    One more reviewed finding on this topic
    • Limited — Construction, moving, structural alteration, and accessory buildings in Tama County.
      “A Zoning Certificate shall be obtained from the Administrative Officer before starting or proceeding with the erection, construction, moving in or the structural alteration of a building or structure. Accessory buildings shall require a Zoning Certificate if the structure is larger than 120 square feet.”
  • Building code adoptedNot adopted

    Tama County building-code regulations.

    • The county recommends, but does not adopt, compliance with the Uniform Building Code or State of Iowa Building Code.
    “At this time, Tama County has not adopted building code regulations.”
    One more reviewed finding on this topic
    • Not adopted — County building-code adoption for Tama County zoning jurisdiction.
      “At this time, Tama County has not adopted building code regulations. It is recommended that structural, electrical and plumbing components comply with the Uniform Building Code or the State of Iowa Building Code.”
  • InspectionsLimited

    Construction subject to a Tama County zoning certificate.

    • The Administrative Officer or authorized representative may inspect during construction when the officer deems inspection necessary.
    • The applicant must give 48 hours notice of the beginning date of construction.

    construction-notice: 48 hours

    “The applicant or his agent shall give the Administrative Officer forty-eight (48) hours notice of the beginning date of construction and the Administrative Officer or his duly authorized representative shall have access to such premises from time on, during construction, for any inspection he deems necessary.”
  • County-wide zoningPresent (with conditions)

    Tama County zoning administration and county zoning ordinances.

    • The county website lists a revised October 2025 zoning ordinance and related subdivision and floodplain ordinances.
    • Specific zoning jurisdiction may differ for incorporated municipalities.
    “For the purpose of this Ordinance, Tama County is hereby divided into the following districts:”
    One more reviewed finding on this topic
    • Present (with conditions) — County zoning in land and structures located within Tama County but outside the corporate limits of any city.
      “For the purpose of this Ordinance, Tama County is hereby divided into the following districts:”
  • Local zoningVaries (with conditions)

    Aggregate local zoning across Tama County, including county zoning outside city corporate limits and separate municipal zoning authority within incorporated cities.

    • Tama County officially identifies 13 incorporated cities.
    • County zoning powers apply only to land outside city corporate limits.
    • Iowa law separately empowers any city to regulate building height, lot coverage, yards, density, and land uses within the city.
    • A city may extend zoning jurisdiction up to two miles into unincorporated territory only by ordinance, except where a county zoning ordinance exists.
    “such powers shall be exercised only with reference to land and structures located within the county but lying outside of the corporate limits of any city.”
  • Zoning districtsPublished (with conditions)

    Tama County zoning districts and district-specific controls.

    • The county ordinance contains district-specific permitted uses, conditional uses, dimensional rules, and zoning maps or district references.
    “ARTICLE VIII. “A”, AGRICULTURAL DISTRICT........................................................................... 23”
    One more reviewed finding on this topic
    • Published (with conditions) — Published zoning district classifications and district-specific regulations in Tama County.
      “The above districts are bounded and defined as shown on the maps entitled “Zoning District Map, Tama County, Iowa”, which has been adopted, which accompanies and is made a part of this Ordinance.”
  • Manufactured homesLimited

    Manufactured homes and mobile-home parks in county zoning districts.

    • The R-1 district permits single-family and manufactured houses complying with the ordinance definition.
    • The R-4 mobile-home-park district requires at least 10 mobile or manufactured homes per park and imposes park and individual-lot standards.

    minimum mobile-home park units: >= 10 homes · R-4 park setback from public street or road: >= 50 feet · R-4 individual lot area: >= 5000 square feet

    “Single family and manufactured houses which comply with the definition of the single family dwellings. [...] A mobile home park shall consist of not less than 10 mobile home or manufactured homes.”
  • Who permits septicMixed (with conditions)

    Private onsite wastewater systems in Tama County.

    • The county Environmental Health Program administers local services and monitoring.
    • State Iowa Code and administrative rules also apply, including Chapter 69 and Iowa Administrative Code 567.69.
    “The Environmental Health Program regulates private on-site waste treatment systems, provides new septic system inspections, administers the Time of Transfer (TOT) septic inspection program, and reviews waste treatment plans in accordance with rezoning and subdivision requests in Tama County.”
    One more reviewed finding on this topic
    • County (with conditions) — Private onsite wastewater systems in Tama County.
      “The Environmental Health Program regulates private on-site waste treatment systems, provides new septic system inspections, administers the Time of Transfer (TOT) septic inspection program, and reviews waste treatment plans in accordance with rezoning and subdivision requests in Tama County.”
  • Septic permitRequired

    New private septic systems and private septic or water-supply construction associated with new construction.

    • The zoning permit page states that private septic systems require septic permits obtained through Tama County Environmental Health.
    • The application is subject to Board of Health rules, county ordinances, and Iowa Administrative Code 567.69.
    “If your new construction will be using a private septic system or water supply, you will need to obtain septic and well permits.”
    One more reviewed finding on this topic
    • Required — New private septic systems and private water/septic construction associated with new construction.
      “If your new construction will be using a private septic system or water supply, you will need to obtain septic and well permits.”
  • Well permitRequired

    New construction using a private water supply.

    • The zoning permit page directs applicants to obtain a well permit through Tama County Environmental Health when the new construction uses a private water supply.
    “If your new construction will be using a private septic system or water supply, you will need to obtain septic and well permits.”
    One more reviewed finding on this topic
    • Required — Private water supplies used for new construction in Tama County.
      “If your new construction will be using a private septic system or water supply, you will need to obtain septic and well permits.”
  • Subdividing landRegulated (with conditions)

    Land divisions and subdivision plats in Tama County.

    • Subdivision regulations apply to any division of land into two or more parts, with certain regulations applying to division of a single lot.
    • A subdivision plat is required when an original lot, tract, or parcel is divided into three or more lots for immediate or future sale or transfer for development purposes.

    subdivision plat threshold: >= 3 lots (For immediate or future sale or transfer for development purposes)

    “The Subdivision Regulations apply to any division of land into two or more parts. Certain regulations apply to the division of a single lot. A subdivision plat is required in Tama County when an original lot, tract or parcel of land is divided into 3 or more lots for the purpose of immediate or future sale or transfer for development purposes.”
    One more reviewed finding on this topic
    • Regulated (with conditions) — Subdivision and land division in Tama County.
      “The Subdivision Regulations apply to any division of land into two or more parts. Certain regulations apply to the division of a single lot. A subdivision plat is required in Tama County when an original lot, tract or parcel of land is divided into 3 or more lots for the purpose of immediate or future sale or transfer for development purposes.”
  • Building in a floodplainRequired

    Development of farm or non-farm property located in Zone A of the Tama County Flood Insurance Rate Map.

    • The floodplain development permit must be obtained before development.
    • Development includes man-made changes to improved or unimproved real estate, including buildings, mining, filling, grading, paving, excavating, and drilling.
    • The county Planning and Zoning Office reviews applications; no Planning and Zoning Commission hearing is required.
    “A floodplain development permit must be obtained prior to the development of any property (farm or non-farm) located with Zone "A" of the Flood Insurance Rate Map for Tama County.”
    One more reviewed finding on this topic
    • Required — Development of farm or non-farm property located in Zone A of the Tama County Flood Insurance Rate Map.
      “A floodplain development permit must be obtained prior to the development of any property (farm or non-farm) located with Zone "A" of the Flood Insurance Rate Map for Tama County.”
  • Permit feesPublished (with conditions)

    Tama County zoning certificates.

    • Fees are determined by structure, building, or addition value.
    • If construction begins before a permit is issued, fees are doubled.
    • The ordinance states the fees were revised as of Fall 2025 and recommended for review/update by Fall 2030.

    minimum fee: 60 USD (For structure value from $0.00 through $1,000.00) · fee through $20,000: per 1 USD per $1,000 (Each additional $1,000 or fraction thereof) · fee through $50,000: per 0.5 USD per $1,000 (Each additional $1,000 or fraction thereof) · fee above $50,000: per 0.2 USD per $1,000 (Each additional $1,000 or fraction thereof)

    “Fees shall be paid to Tama County at either the office of the Zoning Administrator (129 W High St, Toledo IA 52342) or with the Auditor (104 W State St, Toledo IA 52342). Checks should be made out to Tama County Treasurer.”
    One more reviewed finding on this topic
    • Published (with conditions) — Tama County zoning certificates and related zoning applications.
      “For each additional $1,000.00 or fraction thereof, exceeding $50,000.00 | $0.20 per $1,000.00 **Ordinance Section 2302.2: If Construction begins before a permit is issued, the Zoning Certificate fees are to be doubled.”
  • Permit processPublished (with conditions)

    Tama County zoning-certificate application and construction-start process.

    • The applicant must submit a written application, property legal description, proposed uses and cost, and other information deemed essential.
    • A dimensioned lot drawing and site plan are required.
    • Construction requires a zoning certificate and paid fees before starting; 48 hours' construction notice is required.
    • The Administrative Officer issues or denies a completed application within seven days; certificates can expire after 90 days without substantial construction and the use must be established within one year, subject to stated extension provisions.

    construction notice: 48 hours · certificate decision period: 7 days (After completed application) · certificate lapse without substantial beginning: 90 days (Unless written extension is obtained) · use establishment period: 1 year (Unless otherwise extended in writing)

    “The Administrative Officer shall issue, within seven (7) days of the completed application, a written Zoning Certificate of denial thereof with reasons in writing. Except where an extension of time has been obtained in writing from the Administrative Officer, certificates hereafter issued shall expire within ninety (90) days if a substantial beginning has not been made in the construction or if the use applied for has not been established within one (1) year.”

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.”
  • Certificate of occupancyLimited

    Certificates of occupancy or use for buildings subject to Iowa's State Building Code and certificates approving specified buildings, facilities, or installations for licensure.

    • A local building department issues certificates of occupancy or use when required by ordinance.
    • When issued for a building constructed under the state building code, the certificate must certify conformity with the code and is in the form prescribed by the governing body of the governmental subdivision.
    • For facilities governed by Iowa Administrative Code chapter 481.280, if a certificate of occupancy is required for use, it will not be issued until the inspection fee is paid.
    • Chapter 481.280.5 applies to a certificate approving a building, facility, or installation for occupancy upon request from an owner or owner's agency when applicable rules are satisfied and all fees are paid.
    • The state sources do not require a certificate of occupancy for every building statewide.

    additional reinspection fee: 125 USD (Applies for each additional reinspection after the initial reinspection when original deficiencies remain uncorrected.)

    “Issue certificates of occupancy or use, permits, licenses, and other documents in connection with the construction of buildings or structures as may be required by ordinance. (1) A certificate of occupancy or use for a building or structure constructed in accordance with the provisions of the state building code shall certify that the building or structure conforms to the requirements of the code. The certificate shall be in the form the governing body of the governmental subdivision prescribes.”
  • 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.”
  • Minimum lot sizeDistrict specific (with conditions)

    Minimum-lot-size requirements administered through county zoning districts in Iowa, where county zoning has been adopted.

    • County zoning is optional under §335.1.
    • Local zoning districts may have different regulations.
    • A variance may be available only under the statutory practical-difficulties requirements.
    “Area, dimensional, or other numerical limitations subject to variances include but are not limited to requirements for minimum lot size, setbacks, yard widths, height, bulk, sidewalks, fencing, signage, and off-street parking. To receive the requested area, dimensional, or other numerical variance, the property owner must prove that the practical difficulties faced are unique to the property at issue and not self-created and must also demonstrate that granting the variance will not significantly alter the essential character of the surrounding neighborhood.”
  • SetbacksDistrict specific (with conditions)

    Setback requirements administered through Iowa county zoning districts, where adopted.

    • County zoning powers apply only to land and structures outside the corporate limits of any city.
    • Local district regulations may differ by district.
    • Agricultural-use structures and floodplain activities are subject to the exceptions and conditions in §335.2.
    “Subject to section 335.2, the board of supervisors may by ordinance regulate and restrict the height, number of structures, and size of buildings and other structures, the percentage of lot that may be occupied, the size of yards, courts, and other open spaces, the density of population, and the location and use of buildings, structures, and land for trade, industry, residence, or other purposes, and may regulate, restrict, and prohibit the use for residential purposes of tents, trailers, and portable or potentially portable structures. However, such powers shall be exercised only with reference to land and structures located within the county but lying outside of the corporate limits of any city.”
  • Lot coverageDistrict specific (with conditions)

    Lot-coverage limits administered through Iowa county zoning districts, where adopted.

    • County zoning powers apply only outside city corporate limits.
    • The statute authorizes regulation of the percentage of a lot occupied but does not state a statewide percentage.
    • Agricultural-use and floodplain exceptions in §335.2 apply.
    “the percentage of lot that may be occupied”
  • Accessory dwellingsAllowed (with conditions)

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

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

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

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

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

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

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

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

    Land, farm houses, farm barns, farm outbuildings, and other buildings or structures primarily adapted by reason of nature and area for agricultural purposes, while used for those purposes, under county ordinances adopted pursuant to Iowa Code chapter 335.

    • The exemption applies except to the extent required to implement section 335.27.
    • An ordinance may still apply to any structure, building, dam, obstruction, deposit, or excavation in or on the floodplains of any river or stream.
    • The county may not require an application, approval, or fee for the ordinance to be deemed inapplicable under this section.
    • Qualifying land, farm houses, farm barns, farm outbuildings, or other buildings or structures may qualify independently or in combination with other agricultural uses.
    • Land enrolled in a soil or water conservation program is considered land primarily adapted for agricultural purposes.
    • The exemption concerns ordinances adopted under chapter 335; chapter 335 applies to a county at the option of its board of supervisors.
    “no ordinance adopted under this chapter applies”
  • county zoning authorityGeneral

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

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

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

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

Still unanswered

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

  • Living in an RV — Private-lot or long-term recreational-vehicle occupancy in unincorporated Tama County.
  • Camping on your land — Temporary camping outside expressly regulated campgrounds in Tama County.
  • Tiny homes — Tiny-home occupancy in Tama County.
  • Off-grid sanitation — Off-grid sanitation systems in Tama County.
  • Mandatory utility hookup — Water and sewer connection requirements for development in Tama County.
2 more unanswered
  • Driveway access
  • Short-term rentals

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 Tama County, Iowa

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

Tama County scores 58/100 on the Bolthole Index, a solid county profile. Its strengths: low administrative friction for a quiet rural property and higher long-term carry cost. Watch-outs: workable self-sufficiency basics (36.5″/yr rainfall).

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

Tama County requires a building permit only in limited cases (such as floodplains or specific zones), and it enforces county zoning. Onsite septic is permitted by Tama County Sanitarian / Environmental Health Department. 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.

How much does land cost in Tama County, Iowa?

Land in Tama County runs about $9,563 per acre, based on the latest county data.

What is the water situation in Tama County?

Tama County gets about 36.5" of rain a year, with severe drought in roughly 11.9% of years.

How remote is Tama County?

A representative private-land location has about 13,163 people within a 30-minute drive and 1,798,342 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 Tama compares in Iowa

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