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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 Johnson County.

Johnson County’s published FAQ identifies the 2024 International Residential Code, 2024 International Building Code, 2023 National Electrical Code as adopted by Iowa, 2024 International Mechanical Code as adopted by Iowa, 2024 Uniform Plumbing Code as adopted by Iowa, and 2012 International Energy Conservation Code. The county also enforces its Unified Development Ordinance, site-plan, stormwater, erosion and sediment control, sensitive-area, floodplain, and other applicable land-use requirements in unincorporated areas.

Inspection lane

Apply through the CitizenServe portal, upload the PDF building plans and required application materials, pay fees, and use the portal to request/schedule inspections. Building Services conducts site inspections; applicants must coordinate inspections before relevant work is covered and contact staff with questions at 319-356-6085. New homes and commercial buildings also need a wastewater permit from Johnson County Public Health where applicable. Demolition and trade work have separate application requirements.

Minor-work playbook

Understand what may be exempt—and what is not.

A permit is not required for a one-story detached accessory structure of 200 square feet or less used as a tool shed, storage shed, playhouse, or similar use; additions to a house require a permit regardless of size. Window replacement is exempt when headers are not moved/altered/replaced, subject to emergency-escape-opening requirements. A detached deck may be exempt when it is no more than 200 square feet, no more than 30 inches above grade, unattached to a dwelling, and does not serve the main exit door. Construction of decks otherwise requires a permit.

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 through the CitizenServe portal, upload the PDF building plans and required application materials, pay fees, and use the portal to request/schedule inspections. Building Services conducts site inspections; applicants must coordinate inspections before relevant work is covered and contact staff with questions at 319-356-6085. New homes and commercial buildings also need a wastewater permit from Johnson County Public Health where applicable. Demolition and trade work have separate application requirements.

  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 Johnson County

Who handles permitting for this jurisdiction?

Johnson County Planning, Development and Sustainability / Building Services 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 319-356-6085 (Building Services); 319-356-6083 (Planning and Development).

How long might review take?

N/A for ordinary building permits. The county publishes 7-10 business-day estimates for certain complete site-plan reviews after corrections and requested information are submitted; complex zoning, conditional-use, rezoning, stormwater, or public-hearing matters can take longer. Permits must begin within 180 days of issuance and may not be suspended or abandoned for more than 180 days without an extension.

How are inspections scheduled?

Apply through the CitizenServe portal, upload the PDF building plans and required application materials, pay fees, and use the portal to request/schedule inspections. Building Services conducts site inspections; applicants must coordinate inspections before relevant work is covered and contact staff with questions at 319-356-6085. New homes and commercial buildings also need a wastewater permit from Johnson County Public Health where applicable. Demolition and trade work have separate application requirements.

Which codes and exemptions should I review?

Johnson County’s published FAQ identifies the 2024 International Residential Code, 2024 International Building Code, 2023 National Electrical Code as adopted by Iowa, 2024 International Mechanical Code as adopted by Iowa, 2024 Uniform Plumbing Code as adopted by Iowa, and 2012 International Energy Conservation Code. The county also enforces its Unified Development Ordinance, site-plan, stormwater, erosion and sediment control, sensitive-area, floodplain, and other applicable land-use requirements in unincorporated areas. A permit is not required for a one-story detached accessory structure of 200 square feet or less used as a tool shed, storage shed, playhouse, or similar use; additions to a house require a permit regardless of size. Window replacement is exempt when headers are not moved/altered/replaced, subject to emergency-escape-opening requirements. A detached deck may be exempt when it is no more than 200 square feet, no more than 30 inches above grade, unattached to a dwelling, and does not serve the main exit door. Construction of decks otherwise requires a permit.

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.