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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 Crook County.

Crook County's official notice states that it has no land-use regulations, zoning regulations, adopted building codes or building-permit requirements and performs no residential, commercial or industrial construction inspections. For projects within Wyoming State Fire Marshal jurisdiction, the state enforces the 2024 International Fire, Building, Fuel Gas, Mechanical and Existing Building Codes and, effective July 1, 2026, the 2026 National Electrical Code. Crook County separately administers small-wastewater, subdivision, floodplain, rural-addressing and wind-energy requirements when applicable.

Inspection lane

Crook County performs no building-construction inspection and issues no Certificate of Occupancy. For a guaranteed state electrical inspection in Crook County, obtain the wiring permit through the state portal and contact State Electrical Inspector Matt Mullen at 307-752-0348. State fire/life-safety plan-review projects receive construction inspections and must pass before a Certificate of Occupancy or Letter of Compliance. County small-wastewater systems must be inspected before backfilling; contact Growth and Development at 307-283-4548.

Minor-work playbook

Understand what may be exempt—and what is not.

N/A for a county building permit because Crook County requires none. State Fire Marshal plan review is limited to defined public and life-safety projects, including government buildings, schools, public-access buildings over 5,000 square feet, larger child-care facilities, multistory and assembly buildings, qualifying remodels and occupancy changes, fire-protection systems, alternative energy, aboveground fuel tanks, commercial kitchen hoods, spray-finishing work and RV/camping/mobile-home park site plans. Other private work may still require an electrical wiring permit or separate County septic, floodplain, subdivision or wind-energy approval.

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

    Crook County performs no building-construction inspection and issues no Certificate of Occupancy. For a guaranteed state electrical inspection in Crook County, obtain the wiring permit through the state portal and contact State Electrical Inspector Matt Mullen at 307-752-0348. State fire/life-safety plan-review projects receive construction inspections and must pass before a Certificate of Occupancy or Letter of Compliance. County small-wastewater systems must be inspected before backfilling; contact Growth and Development at 307-283-4548.

  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 ↗Fee scheduleOpen official source ↗Planning or zoning referenceOpen official source ↗Contractor license lookupOpen official source ↗

Project questions

Frequently asked questions for Crook County

Who handles permitting for this jurisdiction?

This record is marked State Fallback. Confirm whether a city, state agency, or other local authority controls the parcel 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 307-777-7288.

How long might review take?

The State Fire Marshal accepts or rejects a plan-review submittal for review within five business days and completes a complete accepted review within 21 business days; when additional information is required, review finishes within 10 business days after receipt or the original 21-day period, whichever is later.

How are inspections scheduled?

Crook County performs no building-construction inspection and issues no Certificate of Occupancy. For a guaranteed state electrical inspection in Crook County, obtain the wiring permit through the state portal and contact State Electrical Inspector Matt Mullen at 307-752-0348. State fire/life-safety plan-review projects receive construction inspections and must pass before a Certificate of Occupancy or Letter of Compliance. County small-wastewater systems must be inspected before backfilling; contact Growth and Development at 307-283-4548.

Which codes and exemptions should I review?

Crook County's official notice states that it has no land-use regulations, zoning regulations, adopted building codes or building-permit requirements and performs no residential, commercial or industrial construction inspections. For projects within Wyoming State Fire Marshal jurisdiction, the state enforces the 2024 International Fire, Building, Fuel Gas, Mechanical and Existing Building Codes and, effective July 1, 2026, the 2026 National Electrical Code. Crook County separately administers small-wastewater, subdivision, floodplain, rural-addressing and wind-energy requirements when applicable. N/A for a county building permit because Crook County requires none. State Fire Marshal plan review is limited to defined public and life-safety projects, including government buildings, schools, public-access buildings over 5,000 square feet, larger child-care facilities, multistory and assembly buildings, qualifying remodels and occupancy changes, fire-protection systems, alternative energy, aboveground fuel tanks, commercial kitchen hoods, spray-finishing work and RV/camping/mobile-home park site plans. Other private work may still require an electrical wiring permit or separate County septic, floodplain, subdivision or wind-energy approval.

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.