Washington HVAC license requirements and insurance

To work for yourself as an HVAC contractor in Washington, you need the Specialty Contractor Registration, HVAC/R classification license. Washington has 4 HVAC license types, and which one you need depends on the work you take on. The state's minimum liability insurance is $200,000 for injury and $50,000 for property damage, and workers' comp is required once you have employees. A $15,000 bond is required.

Checked by the Trades by State editor on 2026-09-06 Based on 24 official pages, listed at the bottom Something wrong? Tell us

License you need: Specialty Contractor Registration, HVAC/R classification Renew Every 2 years
Insurance you must carry: $200,000 plus $50,000 for property damage
Workers' comp: Required as soon as you hire anyone
Credit score: None or take a 14-hour course
To protect your pay, send notice by: Send it early. The notice only protects work done in the 60 days before you send it, so anything older is lost (work started on March 1 and notice sent on June 1 covers only work from April 2 onward). On a new single-family house it covers only the 10 days before the notice

Turn this into a checklist

1 What stands out in Washington for an HVAC contractor What is this?

The things people get wrong or do not expect about Washington, in a few sentences.

Washington has no HVAC license. You register with L&I as a specialty contractor in the HVAC/R classification. No exam, no experience check, a bond and insurance are the whole test.
The specialty contractor bond is $15,000 and the general contractor bond is $30,000. Many websites still show $6,000 and $12,000. Those are the old numbers.
Connecting or wiring the equipment is electrical work. For that your business needs a separate electrical contractor license with a $4,000 bond and a named administrator, and your technicians need an 06A HVAC/refrigeration electrician card, which takes 4,000 supervised hours and a 48-hour class.
Washington charges sales tax on your labor. On a normal job you collect retail sales tax on the whole bill, labor and materials, and buy the equipment tax-free with a reseller permit. A furnace in a house is taxed the same way as a rooftop unit on a shop.
Workers' comp comes only from the L&I state fund, and you need an account as soon as you hire one employee. Private workers' comp policies are not allowed.
Before an HVAC job of $1,000 or more starts, the customer must get a written disclosure statement from you. Without it, a lien on that job is off the table.

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·8 official pages

2 Who issues HVAC contractor licenses in Washington? What is this?

Washington State Department of Labor and Industries (L&I), Contractor Registration and Electrical Program issues HVAC licenses in Washington.

Name	Washington State Department of Labor and Industries (L&I), Contractor Registration and Electrical Program
Website	https://lni.wa.gov/licensing-permits/contractors/register-as-a-contractor/
Look up a license	https://secure.lni.wa.gov/verify/
The law	RCW chapter 18.27 (contractor registration) and RCW chapter 19.28 (electrical work)
The rulebook	WAC chapter 296-200A (contractor registration) and WAC chapter 296-46B (electrical)

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3 Washington HVAC contractor license requirements and fees What is this?

Washington has 5 license types that matter to an HVAC contractor. The Specialty Contractor Registration, HVAC/R classification needs none.

Specialty Contractor Registration, HVAC/R classification

Any business that installs, services, or maintains heating, cooling, ventilation, or refrigeration equipment for customers. A specialty contractor can only work in its own classification and cannot hire subcontractors. If you want to hire subs or do other trades, register as a general contractor instead

What you can work on

Fabricating, installing, servicing, and maintaining heating and cooling equipment, duct work, air filters, water treatment devices, pneumatic controls, control piping, insulation, and gas piping to the equipment.
Boilers and steam fitting are a separate classification.
Food-storage refrigeration below 50 degrees is a separate classification

Experience required

None

Training required

None

Exam

Fees

Do you register to collect tax?	$150.2
Renewal	$150.2
Getting a lapsed license back	70.9

Renewal

Every 2 years

Training hours each year

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·3 official pages

Electrical contractor license with the HVAC/refrigeration (06A) specialty

The business, if your crews do any electrical work on the equipment, including low-voltage control wiring. Most HVAC installers need this on top of the contractor registration

What you can work on

Installing, repairing, replacing, and maintaining HVAC and refrigeration systems, and their Class 2 low-voltage control wiring

Voltage limit

None. The 06A specialty is not capped by voltage, phase, or amperage

Where you can work

Any home. In other buildings, ones of three stories or fewer above ground, or a space that was already in use, as long as you stick to the HVAC and refrigeration system

What it does not cover

Line-voltage controllers and disconnect switches outside the equipment, apart from one narrow exception. Whole-building control systems. Standalone line-voltage equipment. Building lighting. Raceway systems. Anywhere classed as hazardous

Experience required

None for the business. You must name an electrical administrator or master electrician to L&I who is responsible for the company following the electrical rules

Training required

None

Exam

No for the business. The administrator has to pass an exam

Fees

Application	$353.9
Renewal by mail	$353.9
Renewal online	$306.2
Administrator exam	$106.7
Administrator certificate	$160

Renewal

Every 2 years

Training hours each year

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·4 official pages

Specialty Electrician Certificate, 06A HVAC/refrigeration

Each technician who does the electrical part of HVAC work. A trainee can work under supervision until they pass

What you can work on

Same as the 06A contractor scope above

Experience required

4,000 hours of work in the specialty, supervised at least 75 percent of the time.
Up to half can come from an approved training program.
Hours from the 06B restricted card count toward it

Training required

48 hours of basic classroom instruction before you can sit the exam

Exam

Yes, an L&I electrician exam

Fees

Exam	80.3
First license	$106.4
Renewal by mail	$106.4
Renewal online	92.6
Trainee certificate	56
Trainee certificate, online	48.1

Renewal

Every 3 years

Training hours each renewal

About training hours

Includes 8 hours of code update and 4 hours on the state electrical laws and rules

Taken from the linked page, not separately checked

·3 official pages

Specialty Electrician Certificate, 06B HVAC/refrigeration restricted

A shorter path for technicians on smaller systems

What you can work on

Same work as 06A but only where the power connection is 250 volts single phase or less and 120 amps or less, in homes and non-residential buildings up to three stories

Experience required

2,000 hours, supervised 100 percent of the time until you pass the exam

Exam

Yes, an L&I electrician exam

Fees

Exam	80.3
Renewal by mail	$106.4
Renewal online	92.6

Renewal

Every 3 years

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·2 official pages

Plumber certificate for hydronic and water-connected work

The HVAC/R classification says the work may also need plumber certification under RCW 18.106. Piping that connects to the building water system, such as hydronic heating or a water-fed humidifier, is plumbing. Check with L&I before you take that work on

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·2 official pages

4 How much insurance does an HVAC contractor need in Washington? What is this?

The least liability insurance Washington lets an HVAC contractor work with is $200,000 for injury and $50,000 for property damage. Most customers ask for more. Workers' comp is required once you have employees.

Minimum liability insurance (injury)	$200,000
Minimum liability insurance (property damage)	$50,000
Or one combined limit of	$250,000
Type of policy	General liability insurance
Who this applies to	Every registered contractor, general or specialty. The statute writes it as $100,000 for one person, $200,000 for more than one person, and $50,000 property damage. The electrical contractor license has no insurance rule of its own, only the bond
Who must be named on the certificate	File the certificate with L&I. If the policy lapses or is canceled, your registration is suspended on the spot until a new policy is filed
Workers' comp required?	Yes, as soon as you hire one employee. Coverage comes only from the L&I state fund. Private workers' comp policies are not allowed in Washington
Who can opt out	Sole proprietors, partners, LLC members, and corporate officers who own shares, sit on the board, and run the business day to day are excluded. A private company can also exclude up to eight officers. Any of them can buy optional coverage from L&I

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·6 official pages

5 Does Washington check your credit for an HVAC contractor license? What is this?

Washington does not check your credit for this license.

Credit score you need	None
If your score is lower	Instead of a surety bond you can file an assigned savings account with L&I for the same amount. L&I can demand up to three times the normal bond if you lost a court case over residential work in the last five years

Checked by a person against the official page·app.leg.wa.gov

6 Does an HVAC contractor need a bond in Washington? What is this?

Washington requires a bond of $15,000. A bond is a promise, backed by an insurance company, that customers can be paid if you do not finish the job.

Does the state require a bond?	Yes
Amount	$15,000

A continuous contractor surety bond (a promise, backed by an insurance company, that customers can be paid if you do not finish or do bad work) of $15,000 for a specialty contractor or $30,000 for a general contractor, or an assigned savings account instead. Older websites still say $6,000 and $12,000. The electrical contractor license needs its own separate $4,000 bond. Cities may ask for more before they let you pull permits

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·3 official pages

7 Federal rules that also apply What is this?

Rules from the US government that apply to an HVAC contractor in Washington on top of the state's own.

EPA refrigerant certification	Anyone who services, repairs, maintains, or disposes of equipment that could release refrigerant must hold EPA Section 608 technician certification, on top of the state cards. Type I is small appliances, Type II high-pressure systems, Type III low-pressure systems, and Universal is all three. The EPA does not issue cards itself. You test with an EPA-approved organization, which sets its own fee

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·2 official pages

8 Where must a Washington HVAC contractor show the license number? What is this?

In Washington: every ad that shows your name or address must show your contractor registration number, and so must every flyer or mailer sent to homeowners. Vehicle signs and signs on your own building are exempt, as are plain alphabetical listings. You may not advertise that you are bonded and insured just because the state makes you carry the minimums.

The rule	Every ad that shows your name or address must show your contractor registration number, and so must every flyer or mailer sent to homeowners. Vehicle signs and signs on your own building are exempt, as are plain alphabetical listings. You may not advertise that you are bonded and insured just because the state makes you carry the minimums
If you forget	Up to $10,000 per violation after a hearing. Not charged for an honest mistake
Written notice you must give the customer	Before starting any home job of $1,000 or more, or a commercial job of $1,000 to $60,000, you must hand the customer a written disclosure statement about bonds, insurance, and liens. Without it you cannot file a lien on that job

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·2 official pages

9 Does an HVAC contractor charge sales tax on labor in Washington? What is this?

In Washington, taxed. Same rule as above. The rest of the rules are below.

See how this compares in every state: Sales tax on labor for plumbers and HVAC contractors by state

Building for a customer	You charge retail sales tax on the whole contract price, labor and equipment, and show it as a separate line on the invoice. This is called retail or custom construction and covers most jobs an HVAC company does for a homeowner or a business
Labor on homes (repairs and remodels)	Taxed. Same rule as above
Repairs and remodels on businesses	Taxed. Same rule as above
Labor on new buildings	Taxed when you work for the landowner or a prime contractor. Building on land you own to sell (speculative building) is taxed differently
Equipment and materials	You buy furnaces, heat pumps, duct, and parts that become part of the building tax-free with a reseller permit. You pay sales tax on tools, supplies, and anything you use up on the job
Service contracts	Not covered in the state's guide. Ask the Department of Revenue before you sell maintenance plans
Business and occupation tax	Your gross receipts from custom construction are also taxed under the Retailing B&O classification, a tax on the business itself that you do not pass to the customer
Tax rate	6.5 percent state rate plus the local rate for the job site

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·3 official pages

10 Getting paid: lien and notice deadlines for a Washington HVAC contractor What is this?

If you are not paid in Washington, a lien on the property is your backstop, but only if your notice goes out on time: send it early. The notice only protects work done in the 60 days before you send it, so anything older is lost (work started on March 1 and notice sent on June 1 covers only work from April 2 onward). On a new single-family house it covers only the 10 days before the notice.

Who has to send a notice	On most jobs, three groups do not have to send one. Someone hired by the property owner. A worker claiming only for their own labor. And a subcontractor hired directly by the prime contractor. Everyone else furnishing services, materials, or equipment sends the owner a notice of a right to claim a lien
The exception that catches people out	Repair, alteration, or remodeling of a home the owner lives in, or its garage, works the other way. There, anyone who did not contract directly with that owner must send them the notice, including a subcontractor hired by the prime. Send it, or you have no lien on that house
What the lien reaches on a home the owner lives in	Only money the owner has not yet paid the prime contractor when your notice arrives. If the owner has already paid the prime in full, there is nothing for your lien to reach
Send your notice by	Send it early. The notice only protects work done in the 60 days before you send it, so anything older is lost (work started on March 1 and notice sent on June 1 covers only work from April 2 onward). On a new single-family house it covers only the 10 days before the notice
File your lien by	Record the lien with the county where the property sits within 90 days of your last day of work or last delivery (last work on June 1 means the lien is recorded by August 30)

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·3 official pages

11 How much does it cost to become an HVAC contractor in Washington? What is this?

The government fees on this page add up to about $150 in Washington. Add insurance, tools, and a vehicle to get the real number.

Government fees, added up	$150
Government fees including the electrical license, added up	$747

Does not include the administrator exam, the $15,000 and $4,000 bond premiums, insurance premiums, workers' comp, the EPA 608 test, tools, a vehicle, or city permits

Our estimate

12Where these numbers come from

The labels under each table are explained on how to read a page.