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Codes, exemptions & field inspections

Build to the adopted code. Verify every exception.

This guide translates the available agency record into a preconstruction checklist for structural scope, minor work, and inspection release. The adopted code and the issuing official control when a field condition is disputed.

Regulatory framework

The code baseline for Mills County.

Mills County lists the 2018 International Building Code, 2018 International Residential Code, 2021 International Mechanical Code, 2018 state Uniform Plumbing Code, 2020 state National Electrical Code, 2018 International Fuel Gas Code, 2018 International Existing Building Code, 2012 state International Energy Conservation Code, and 2018 International Property Maintenance Code. Chapter 24 incorporates county building, residential, plumbing, mechanical, electrical, fuel-gas, energy, existing-building, historic-building, property-maintenance, demolition, and factory-built-structure codes for unincorporated areas.

Inspection lane

Apply online through the county-linked iWorQ portal or submit the county PDF application with plans, site plan, E-911 address, REScheck, state electrical permit, water/sewer or septic documentation, and flood-elevation information when applicable. For permits issued after July 16, 2021, the Building Official does not conduct inspections; each residential phase must be inspected by licensed/certified agencies, contractors, or individuals and documented by a Contractor Certificate of Compliance. Commercial phases require an approved certified inspection agency, architect, or engineer. A certificate of occupancy requires the applicable inspection reports and documents.

Minor-work playbook

Understand what may be exempt—and what is not.

Chapter 24 exempts one-story detached accessory sheds/playhouses up to 200 square feet; fences; certain oil derricks; retaining walls up to 4 feet; grade-supported water tanks up to 5,000 gallons with a 2:1 height ratio; qualifying sidewalks, driveways, patios, and decks no more than 30 inches above grade; painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work; temporary stage sets up to 15 days; qualifying above-ground pools; agricultural shade-cloth structures; playground equipment; qualifying wall awnings; movable fixtures; short partitions; and same-size roofing, siding, door, and window replacements. Ordinary nonstructural repairs and emergency repairs have additional limits/reporting rules. Farmhouses and farm buildings primarily adapted for agriculture are outside the county building-code power while used for agriculture; zoning/floodplain rules may still apply.

Field rule

A permit exemption generally addresses one narrow construction trigger. It does not automatically waive zoning, land-use, floodplain, shoreline, fire, energy, electrical, utility, septic, or right-of-way requirements. Obtain written confirmation when the project involves a new structure, structural alteration, change in occupancy, or concealed work.

Inspection pipeline

Keep the work visible at every release point.

  1. 1

    Request with lead time

    Apply online through the county-linked iWorQ portal or submit the county PDF application with plans, site plan, E-911 address, REScheck, state electrical permit, water/sewer or septic documentation, and flood-elevation information when applicable. For permits issued after July 16, 2021, the Building Official does not conduct inspections; each residential phase must be inspected by licensed/certified agencies, contractors, or individuals and documented by a Contractor Certificate of Compliance. Commercial phases require an approved certified inspection agency, architect, or engineer. A certificate of occupancy requires the applicable inspection reports and documents.

  2. 2

    Preserve access

    Do not cover framing, reinforcement, wiring, piping, damp-proofing, or life-safety work until the required inspection has been completed and documented.

  3. 3

    Close the record

    Retain the approved plans, inspection approvals, correction responses, and final certificate or occupancy release with the property file.

Contractor verification

Verify the builder before the contract is signed.

Use the state licensing system to verify active registration, trade credentials, bond status, and liability coverage where available. Match the legal business name to the proposal and permit application.

Verify contractor ↗

Planning reference

Keep the parcel rules beside the building plans.

A building permit is only one part of statutory compliance. Check the local zoning, ordinance, map, or land-use reference before finalizing setbacks, height, lot coverage, access, drainage, or accessory structure placement.

Open planning reference ↗

Source trail

Official sources for this profile

Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.

Agency websiteOpen official source ↗Permit portalOpen official source ↗Application instructionsOpen official source ↗Fee scheduleOpen official source ↗Planning or zoning referenceOpen official source ↗Contractor license lookupOpen official source ↗

Project questions

Frequently asked questions for Mills County

Who handles permitting for this jurisdiction?

Mills County Building & Zoning Department / Building and Safety Department is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.

How should I begin an application?

Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact 712-527-4347; fax 712-527-4439.

How long might review take?

N/A. The Building Official must examine an application within a reasonable time and issue a conforming permit as soon as practicable. An application is abandoned after 180 days unless pursued in good faith or extended in writing, generally in extensions of up to 90 days.

How are inspections scheduled?

Apply online through the county-linked iWorQ portal or submit the county PDF application with plans, site plan, E-911 address, REScheck, state electrical permit, water/sewer or septic documentation, and flood-elevation information when applicable. For permits issued after July 16, 2021, the Building Official does not conduct inspections; each residential phase must be inspected by licensed/certified agencies, contractors, or individuals and documented by a Contractor Certificate of Compliance. Commercial phases require an approved certified inspection agency, architect, or engineer. A certificate of occupancy requires the applicable inspection reports and documents.

Which codes and exemptions should I review?

Mills County lists the 2018 International Building Code, 2018 International Residential Code, 2021 International Mechanical Code, 2018 state Uniform Plumbing Code, 2020 state National Electrical Code, 2018 International Fuel Gas Code, 2018 International Existing Building Code, 2012 state International Energy Conservation Code, and 2018 International Property Maintenance Code. Chapter 24 incorporates county building, residential, plumbing, mechanical, electrical, fuel-gas, energy, existing-building, historic-building, property-maintenance, demolition, and factory-built-structure codes for unincorporated areas. Chapter 24 exempts one-story detached accessory sheds/playhouses up to 200 square feet; fences; certain oil derricks; retaining walls up to 4 feet; grade-supported water tanks up to 5,000 gallons with a 2:1 height ratio; qualifying sidewalks, driveways, patios, and decks no more than 30 inches above grade; painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work; temporary stage sets up to 15 days; qualifying above-ground pools; agricultural shade-cloth structures; playground equipment; qualifying wall awnings; movable fixtures; short partitions; and same-size roofing, siding, door, and window replacements. Ordinary nonstructural repairs and emergency repairs have additional limits/reporting rules. Farmhouses and farm buildings primarily adapted for agriculture are outside the county building-code power while used for agriculture; zoning/floodplain rules may still apply.

Field sequencing matters

The inspector needs to see the work at the right moment.

Code compliance is not only a plan-review exercise. Footings, reinforcement, framing, fireblocking, wiring, piping, insulation, weather protection, and life-safety systems each have points where the work must remain accessible. Build the inspection calendar into the trade schedule instead of treating it as a final administrative step.

When a project qualifies for a narrow minor-work exemption, keep a written explanation of why it qualifies and confirm that related zoning, utility, fire, energy, or environmental rules do not create a separate approval requirement.

Closeout file

Keep the approved plan set, inspection approvals, correction responses, contractor license verification, final certificate, and any occupancy release together. A clean record protects the owner, builder, lender, insurer, and future buyer.