How to Start a Plumbing or HVAC Business in Wyoming: No State License, City Licenses in Cheyenne and Casper, and the State Limited-Electrical Trap

October 29, 2026

If you are looking for a Wyoming HVAC license, the first fact to absorb is that the state does not license you for plumbing or HVAC work. There is no state plumber, HVAC or mechanical contractor license in the Wyoming statutes. The state adopts the codes that govern the work, and cities decide who may perform it. The practical question is therefore a city question, and the answer depends on where you plan to work. Cheyenne and Casper both license these trades, and their rules do not carry over to each other. The one trade where the state does issue a license is electrical, and plumbing and HVAC owners run into that rule more often than any other.

This guide walks through the steps in the order most new owners should handle them. It is informational content, not legal or tax advice. Fees, rates and rules change, so confirm each figure with the agency named in this article before you spend money. For complex situations, such as multi-city work, out-of-state ownership or a mixed electrical and mechanical crew, talk with a qualified attorney or CPA.

What You Need Before You Start

• A written list of the services you will offer, such as plumbing, HVAC, refrigeration, gas piping or water heaters. Each one can trigger a different license.
• A list of every city where you will work. Counties do not issue business licenses, so your city list drives your licensing.
• An entity name checked for availability on the WyoBiz business filing search.
• A physical Wyoming street address for a registered agent. A PO box can be added but cannot replace the street address.
• Funds for Secretary of State charges: a $100 filing fee to form an LLC or corporation, $60 for an LLC name reservation (paper only) and a $60 minimum annual report.
• Funds for city license fees, which vary widely (see the table below), plus liability insurance, which Casper requires at specific limits.
• Trade credentials for every employee who works on a job site, since Cheyenne requires each one to hold a classification.
• Federal EPA refrigerant certification for anyone who handles refrigerant.

Step 1: Confirm the State Does Not License Your Trade

Start by ruling out the state. Wyoming has no general statewide business license, and it issues no state plumber, HVAC or mechanical license. The Department of Fire Prevention and Electrical Safety does adopt the 2024 International Mechanical and Fuel Gas Codes through its plan review, so your installs must meet those codes. Adopting a code, however, is not the same as licensing a contractor. When a search result or supplier tells you that you need a Wyoming plumbing license, they almost always mean a city license.

Step 2: Get the City License Where You Will Work

Only cities and towns issue business and contractor licenses in Wyoming. Counties handle land use, building, septic and liquor matters but do not license your business. Each city sets its own classes and fees, and you must hold whatever that city requires before you bid or start a job there.

Cheyenne. Cheyenne's Class C1 license covers plumbing, HVAC (warm-air heating, ducts, venting and sheet metal) and refrigeration. Every employee on a job site in these trades must hold a master, journeyman, apprentice or qualified supervisor classification. Refrigeration work also requires EPA Type II, III or Universal certification. Current company and trade license fees are not settled in this guide, so call the Cheyenne Compliance Division at (307) 637-6200 to confirm them.

Casper. Casper's rules are the most specific of the cities covered here. A mechanical or plumbing contractor pays $300 for a new license and $150 to renew, and the business must employ a full-time master. The contractor must carry insurance of $250,000 per person, $500,000 per incident and $250,000 for property damage. Master licenses require passing the ICC G29-N mechanical or G27-N plumbing exam. The other Casper trade fees are in the table below.

Gillette, Laramie and other towns. Gillette's 2026 Class C renewal is $75. Laramie issues trade licenses, but you should confirm its fees directly with the City of Laramie. For smaller towns, contact the city clerk, since licensing is decided city by city.

City	License	New / renewal fee
Cheyenne	Class C1 (plumbing, HVAC, refrigeration)	Confirm with Compliance Division, (307) 637-6200
Casper	Mechanical or plumbing contractor (must employ a full-time master)	$300 / $150
Casper	Master (ICC G29-N or G27-N exam)	$75 / $37.50
Casper	Journeyman	$25 / $15
Casper	Apprentice	$3
Casper	Gas utility contractor	$150 / $75
Casper	Gas utility installer	$25 / $15
Casper	Sanitary sewer cleaning, utility or water conditioning contractor	$150 / $75
Gillette	Class C	$75 renewal
Laramie	Trade license	Confirm with the City of Laramie
Other towns	Varies by city	Confirm with the city clerk

These licenses are not interchangeable. A Cheyenne Class C1 does not make you licensed in Casper, and an out-of-state license is not honored automatically in either city.

Step 3: Form Your Entity With the Secretary of State

Register your business with the Wyoming Secretary of State, Business Division, through the WyoBiz portal. For an LLC, file Articles of Organization for a $100 filing fee. For a corporation, file Articles of Incorporation for the same $100 filing fee. An LLC name must include Limited Liability Company or an approved abbreviation such as LLC, L.L.C., LC or Ltd. Liability Company. The name must be available and distinguishable on the WyoBiz search before you file, and entity names beginning with the letter A must be filed on paper.

A name reservation holds the name for 120 days for $60, but it is paper only, with no online option. Online filings, including initial formations, become active as soon as they are completed. Paper filings are processed in the order received and can take up to 15 business days. Expedited processing costs $1,400 for same business day service (received by 12:00 noon MT) or $700 for next business day service (received by 5:00 p.m. MT). Expedited service does not apply to initial formations completed online. Some older PDF instruction sheets still say expedited filing is unavailable, so check the current WyoBiz instructions for the filing you need.

Step 4: Appoint a Registered Agent

Every Wyoming entity must continuously maintain a registered agent to accept legal papers. The agent can be a Wyoming resident or an authorized business entity, and it must have a physical street address in Wyoming, including any suite number. A drop box does not qualify, and a PO box is accepted only in addition to a physical address. Commercial registered agents pay a $50 annual registration. Appointing a new registered agent and office costs $5. The agent signs a Consent to Appointment certifying compliance with W.S. 17-28-101 through 17-28-111.

Step 5: Calendar the Annual Report

Wyoming levies no corporate income tax, no personal income tax and no franchise tax, so the annual report is the only recurring state entity charge. The annual report license tax has a $60 minimum and is due on the first day of your formation's anniversary month every year. You may file it up to 120 days before the due date. If it is not paid within 60 days of the due date, the entity faces administrative dissolution.

The $60 is a floor, not a flat fee for every company. The tax is two-tenths of one mill on the dollar ($.0002) of assets located and employed in Wyoming, or $60, whichever is greater. An entity with $300,000 or less in Wyoming assets pays $60, while $1,210,000 in Wyoming assets produces $242. A plumbing or HVAC shop with trucks and parts inventory located and used in Wyoming should estimate those assets before assuming the $60 minimum applies.

Step 6: Register for Sales and Use Tax

If your business makes taxable sales, you need a sales and use tax license from the Wyoming Department of Revenue, Excise Tax Division. The application carries a $60 non-refundable fee. Apply through the department at excise-tax-div.wyo.gov. The state rate is 4%. County option taxes and resort districts are added on top, and there is no city sales tax. County rates change quarterly, so date any rate you quote and check the Department of Revenue rate chart before you invoice.

Contractor tax rules are where many new shops go wrong. Installation labor is not taxable, but the contractor pays tax on the materials it installs under W.S. 39-15-303(b). Sales tax applies to goods and a list of enumerated services, and repair and alteration of personal property is taxable. Confirm with the Department of Revenue how your service calls are classified. Wyoming issues no resale certificate. Instead, your buyer gives you a signed certificate.

Step 7: Set Up Workers' Compensation

Wyoming's workers' compensation system is a monopolistic state fund run by the Department of Workforce Services. Construction, NAICS 23, is compulsory once you have employees. Sole proprietors, partners, officers and LLC members are excluded unless they elect coverage. That exclusion matters for owners who work in the field. If you install alongside your crew, you are not covered by default, so decide whether to elect coverage before your first job, and confirm the process with the Department of Workforce Services.

Step 8: Handle the State Limited-Electrical Trap

This is the step that catches most plumbing and HVAC owners. Wyoming has no plumber or HVAC license, but it does license electrical work. Load-side electrical work performed by a plumbing or HVAC business requires a state limited electrical license. For HVAC, that is the LM-H license. For water well and irrigation work, it is the LM-W license. The requirement comes from 35-9-123(a)(viii). Lawn-sprinkler controls operating under 90 volts require an LV-LS technician, which involves 80 hours of training.

In practice, your crew can set a condenser, run the line set and route the condensate drain under whatever city license applies, but connecting the equipment's electrical supply is a separate licensed task. Confirm which tasks fall on the load side with the Department of Fire Prevention and Electrical Safety (wsfm.wyo.gov) before you bid. The electrical rules are detailed enough to deserve their own review, so read our separate electrician guide before you hire for or bid any electrical scope.

Step 9: Certify Refrigerant Handling

Refrigerant handling requires federal EPA certification, which is separate from any Wyoming or city license. Cheyenne also requires EPA Type II, III or Universal certification for refrigeration work. Keep the certification records for each technician on file and make them easy to produce during a job or inspection.

Step 10: Price Insurance and Bonding Before You Bid

Casper sets specific insurance minimums of $250,000 per person, $500,000 per incident and $250,000 for property damage. Other cities may require different coverage, so confirm limits before you buy a policy. If you are an out-of-state mechanical contractor bidding as the prime contractor, nonresident bond rules may apply. Confirm those requirements with the city and the state before you bid on Wyoming work.

Common Mistakes to Avoid

• Searching for a state plumbing or HVAC license. It does not exist. Your time is better spent on the city license, which is the one that matters.
• Treating one city's license as valid in another. Cheyenne and Casper rules differ, and out-of-state licenses are not honored automatically.
• Staffing a Cheyenne job site with unclassified helpers. Every employee on a job site in these trades must hold a qualifying classification.
• Running a Casper contractor license without a full-time master. The city requires one on staff.
• Doing load-side electrical work under a plumbing or HVAC license. That work requires LM-H, LM-W or another state license.
• Expecting expedited service for an online LLC formation. Online initial formations are not eligible.
• Using a PO box as the only registered agent address. A physical Wyoming street address is required.
• Missing the annual report. Failing to pay within 60 days of the due date can lead to administrative dissolution.
• Assuming owners are covered by workers' compensation. Members, officers and partners are excluded unless they elect coverage.
• Getting the tax treatment backward. Installation labor is not taxable, but you pay tax on the materials you install. Have your classifications checked with the Department of Revenue.

What Results to Expect

Following these steps in order may help you avoid stopped jobs, failed inspections and surprise bills, and it may put you in a position to bid on work in Cheyenne and Casper. It does not guarantee approval, customer demand or revenue. Timing depends on the city, the filing method and how quickly your employees' credentials are verified. An online formation can be active as soon as the filing is complete, while paper filings can take up to 15 business days. The city license step may take the longest, so ask the city clerk or license office about timing early.

Where to Confirm Each Figure

• Wyoming Secretary of State, Business Division: sos.wyo.gov
• WyoBiz online filing: wyobiz.wyo.gov
• Wyoming Department of Revenue, Excise Tax Division: excise-tax-div.wyo.gov
• Cheyenne Compliance Division: (307) 637-6200
• Department of Workforce Services, workers' compensation and Department of Fire Prevention and Electrical Safety, electrical licensing: confirm contact details through the state agency directory
• Wyoming SBDC Network: wyomingsbdc.org
• U.S. Small Business Administration, Wyoming district: sba.gov/district/wyoming

This article is informational only and is not legal or tax advice. Confirm current fees, licensing and tax rules with the agencies named above, and consult a qualified attorney or CPA for your situation.