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Change of Use / Zoning Certificate & Certificate of Occupancy in Unincorporated Natrona County, Wyoming

Natrona County does not issue a standalone 'change of use permit' product; a change of use of any building or land area is regulated through the Zoning Certificate process (Zoning Resolution § 5.12), administered by the Natrona County Planning Department, and closed out with a Certificate of Occupancy (C.O.) issued by the Building Department once the Building Official finds the completed work free of code violations.

Verified 2026-07-22 · Source

When you need this permit

  • A Zoning Certificate must be obtained from the Applicable Director (Planning Department) before any building, structure, or manufactured home is commenced, erected, or altered, and before any building, electrical, or plumbing permit is issued, per Zoning Resolution § 5.12(B)
  • Any future modification of an existing building, OR any change of use of a building or land area, requires a subsequent Zoning Certificate approval per § 5.12(E) — this is the county's mechanism for regulating change-of-use
  • Exemptions from the Zoning Certificate requirement: accessory structures under 225 sf that are not on a permanent foundation and not attached to a building with a permitted use (§ 5.12(B)(1)); and internal renovations that do NOT change the use of the building (§ 5.12(B)(2))
  • Zoning Certificate approval criteria: compliance with Chapter 4 use-specific standards and the applicable zoning district, the Natrona County Subdivision Resolution, and Casper/Natrona County Health Department Rules and Regulations
  • A Zoning Certificate becomes void one year after issuance unless the associated use is established — established by a Building Permit having been issued and construction diligently pursued, a Certificate of Occupancy having been issued, the use physically established with supporting records, or the Zoning Certificate being renewed (§ 5.12(F))
  • To close out a building permit and obtain a Certificate of Occupancy, request it from the Building Official with seven business days' advance notice; the project must be fully completed per approved plans (structural, electrical, plumbing, mechanical) and the Building Official must find no violations of the adopted codes or other laws enforced by the Development Department

Required documents

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Fee schedule

Zoning Certificate application feeZoning Resolution § 5.19 states the Board of County Commissioners establishes application fees per an adopted fee schedule, but no distinct published dollar figure specific to a Zoning Certificate was located as of this review; Natrona County Permit Fees Resolution No. 45-20 covers Building/Electrical/Plumbing/Mechanical construction permits only, not zoning applications. Confirm current fee with Natrona County Planning (307-235-9447).
Not published
Certificate of OccupancyThe C.O. closes out an already-permitted building permit; the county's FAQ and Resolution No. 45-20 fee schedule do not list a distinct C.O. issuance fee separate from the underlying building permit fee already paid.
No separate fee identified

Review timeline

Plan review
Not published — contact the department

How long did your Change of Use / Zoning Certificate & Certificate of Occupancy permit actually take in Unincorporated Natrona County?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Final Occupancy Inspection

    Requested from the Building Official with seven business days' advance notice; all structural, electrical, plumbing, and mechanical work must be complete per approved plans. The Certificate of Occupancy is issued once the Building Official finds no violations of the adopted codes or other enforced laws.

See the full Unincorporated Natrona County inspection guide — scheduling & re-inspection fees →

Tips

  • Natrona County has no standalone 'change of use permit' — a change of use is regulated by requiring a new Zoning Certificate (§ 5.12) from Planning, separate from any Building Department permit for physical construction.
  • Internal renovations that do NOT change the use of the building are explicitly exempted from needing a new Zoning Certificate (§ 5.12(B)(2)) — the trigger is a change in USE, not just remodeling.
  • A Zoning Certificate expires after one year unless the use is established (building permit issued and construction pursued, a C.O. issued, or documented continuous physical use) — don't sit on an approved Zoning Certificate.
  • Request your Certificate of Occupancy at least seven business days before you need it — the Building Official needs that lead time and must find zero outstanding code violations before issuing it.

Frequently asked questions

Unincorporated Natrona County requires a change of use / zoning certificate & certificate of occupancy permit for: A Zoning Certificate must be obtained from the Applicable Director (Planning Department) before any building, structure, or manufactured home is commenced, erected, or altered, and before any building, electrical, or plumbing permit is issued, per Zoning Resolution § 5.12(B); Any future modification of an existing building, OR any change of use of a building or land area, requires a subsequent Zoning Certificate approval per § 5.12(E) — this is the county's mechanism for regulating change-of-use; Exemptions from the Zoning Certificate requirement: accessory structures under 225 sf that are not on a permanent foundation and not attached to a building with a permitted use (§ 5.12(B)(1)); and internal renovations that do NOT change the use of the building (§ 5.12(B)(2)); Zoning Certificate approval criteria: compliance with Chapter 4 use-specific standards and the applicable zoning district, the Natrona County Subdivision Resolution, and Casper/Natrona County Health Department Rules and Regulations; A Zoning Certificate becomes void one year after issuance unless the associated use is established — established by a Building Permit having been issued and construction diligently pursued, a Certificate of Occupancy having been issued, the use physically established with supporting records, or the Zoning Certificate being renewed (§ 5.12(F)); To close out a building permit and obtain a Certificate of Occupancy, request it from the Building Official with seven business days' advance notice; the project must be fully completed per approved plans (structural, electrical, plumbing, mechanical) and the Building Official must find no violations of the adopted codes or other laws enforced by the Development Department. If your project isn't listed, confirm with Natrona County Building Department at (307) 235-9435 before starting work.

In Unincorporated Natrona County, the published Zoning Certificate application fee is: Not published. Additional published fees: Certificate of Occupancy — No separate fee identified. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Unincorporated Natrona County does not publish a plan-review timeline for this permit. Contact Natrona County Building Department at (307) 235-9435 for current turnaround.

You'll need: Zoning Certificate Application. Depending on your project, Unincorporated Natrona County may also ask for: Natrona County Building Permit Application (2025). See the required-documents checklist on this page for details on each.

Unincorporated Natrona County requires 1 inspection(s) for a change of use / zoning certificate & certificate of occupancy permit, in order: Final Occupancy Inspection. Schedule each through Natrona County Building Department ((307) 235-9435).

Apply through Natrona County Building Department at 200 N. Center St, Room 205, Casper, WY 82601. Phone: (307) 235-9435, email: Contact via natronacounty-wy.gov (email obfuscated on site; call 307-235-9435). Office hours: Monday–Friday, 8:00 AM–5:00 PM. Official information: https://www.natronacounty-wy.gov/170/Building-Inspection.

Not as a standalone product. A change of use of any building or land area requires a new Zoning Certificate under Zoning Resolution § 5.12(E), reviewed by the Planning Department. If the change of use involves construction or a Certificate of Occupancy closeout, the Building Department's building permit process also applies.

A Certificate of Occupancy (C.O.) is a formal document issued when a permitted project is completed according to approved plans and inspected by a Building Inspector. Request it from the Building Official with seven business days' advance notice; it is issued once all work (structural, electrical, plumbing, mechanical) is complete and the Building Official finds no code violations. Source: Natrona County Building & Inspection FAQ.

Sources & verification

Verified against official sources. Last reviewed 2026-07-22.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Unincorporated Natrona County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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