Washington HVAC Contractor Registration Requirements (2026)

The Washington State Department of Labor and Industries (L&I) registers HVAC contractors as Specialty Contractors under RCW Chapter 18.27 — the same statute that governs general contractor registration. Washington does not impose a state-level HVAC trade examination or experience requirement; HVAC contracting competency is enforced through bonding, insurance, and the L&I complaint process. However, any work that includes electrical connections requires a separate L&I (06A) HVAC/Refrigeration Specialty Electrician certificate, and any work involving refrigerants requires federal EPA Section 608 certification.

Regulatory Oversight

Washington State Department of Labor and Industries (L&I) administers and enforces this credential under the authority of Revised Code of Washington Chapter 18.27 (Contractors); Chapter 19.28 (Electricians); Chapter 18.106 (Plumbers). L&I registers contractors statewide, certifies individual electricians and plumbers, administers prevailing wage, and conducts complaint investigations.

Official portal: https://lni.wa.gov/licensing-permits/contractors/
Address: 7273 Linderson Way SW, Tumwater, WA 98501
Phone: (360) 902-5226

Who May Apply

At a minimum the applicant has to be 18 years old and supply a valid Social Security Number. No Washington residency requirement.

Good moral character

L&I conducts a fitness review on every applicant. Prior contractor judgments and L&I infractions are reviewed individually.

Background investigation

L&I screens for unpaid contractor judgments and prior L&I infractions.

Required Experience and Education

No fixed number of years of experience is set out in the cited sources for this credential; instead, the controlling requirement is Washington imposes no statutory experience requirement for HVAC specialty contractor registration. The (06A) HVAC/Refrigeration Specialty Electrician certificate (required for electrical connections) requires 4,000 hours of supervised electrical experience in HVAC..

Accepted proof of experience or eligibility

L&I Contractor Registration application (Form F625-001-000)
(06A) electrical specialty certificate hours affidavits (where applicable)

Education substitution

Not applicable to the contractor registration; (06A) electrical certificate may use apprenticeship credit.

Examination Requirements

No examination required for HVAC specialty contractor registration. ICC administers the (06A) HVAC/Refrigeration Specialty Electrician exam separately. runs the examination for this credential. Issuance is contingent on passing every part below:

(06A) HVAC/Refrigeration Specialty Electrician — required for electrical connections — 80 questions, 240 minutes, passing score 70%

Examination fee: $84.50 ICC exam fee for the (06A) certificate (where applicable).

Retake policy: Failed (06A) examinations may be re-taken by paying a new $84.50 fee.

Insurance and Financial Requirements

The L&I requires a $6,000 contractor license surety bond to be on file before the license will issue.

General liability

Washington requires $250,000 per occurrence and $200,000 property damage (or $250,000 combined single limit) general liability insurance for specialty contractors under RCW 18.27.050.

Workers' compensation

Washington workers compensation is administered by L&I under RCW Title 51. HVAC contractors with employees must open an L&I workers compensation account.

Additional financial requirements

$6,000 specialty contractor surety bond required for HVAC contractor business registration.

Licensing Fees

Fee	Amount
Application (non-refundable)	$124
Examination	$84
Initial license	$124
Renewal (every 2 years)	$124

Keeping the License Current

Renewal of the Washington Specialty Contractor — Heating and Air Conditioning comes due every 2 years. As cited, the renewal fee stands at $124. Washington HVAC contractor registrations renew every two years.

Continuing education: Washington does not require continuing education for HVAC specialty contractor registration renewal. The (06A) electrical certificate requires its own continuing education.

Downloadable Asset

2026 Washington HVAC License Roadmap (PDF) — a printable step-by-step checklist for the application process.

Download the PDF roadmap →

Reciprocity and License Transfer

The NASCLA Accredited Examination is not accepted by Washington for this classification.

Reciprocal State	Accepted Exam	Conditions
Oregon	(06A) electrical exam may be waived	Bilateral L&I–Oregon BCD reciprocity for active HVAC/refrigeration specialty electricians.
Idaho	(06A) electrical exam may be waived	Bilateral L&I–Idaho DOPL reciprocity.

Washington does not maintain HVAC-specific reciprocity for the contractor registration because no exam is required. Reciprocity applies only to the (06A) electrical specialty certificate.

Weighing more than one jurisdiction? The national hub compares HVAC license requirements in every state — exam, bond, fee, and experience thresholds side by side.

Application Process, Step by Step

Form a business and obtain a UBI. Register the business with the Washington Secretary of State (if applicable) and obtain a Unified Business Identifier from the Department of Revenue.
Open a workers compensation account with L&I. Required if the business will have employees.
Post a $6,000 specialty contractor surety bond. Bond must be filed directly with L&I by the surety company.
Obtain $250,000 general liability insurance. Required for all specialty contractor registrations.
Obtain EPA Section 608 certification. Federal refrigerant handling certification required for any work involving refrigerants.
Obtain the (06A) HVAC/Refrigeration Specialty Electrician certificate (if doing electrical connections). Requires 4,000 hours of supervised electrical experience in HVAC and passing the ICC (06A) exam at 70%.
File the L&I Contractor Registration application. Submit Form F625-001-000 with the $124.40 registration fee.

Document Checklist

The most critical documents or confirmations the applicant should have in hand before filing with L&I:

☐ Unified Business Identifier (UBI) from Washington Department of Revenue
☐ L&I workers compensation account (if any employees)
☐ $6,000 specialty contractor surety bond filed directly with L&I
☐ $250,000 general liability insurance certificate
☐ EPA Section 608 certification
☐ (06A) HVAC/Refrigeration Specialty Electrician certificate (if doing electrical connections)
☐ L&I Contractor Registration application (Form F625-001-000) with $124.40 fee

Recommended References

The references below are either cited by the board, used during the application, or standard preparation for the trade. They are listed purely for convenience — CLR earns no commission on any of them.

L&I Contractor Registration Handbook (Form F625-085-000) — Washington L&I. Step-by-step guide to the registration process.
WAC Chapter 296-46B (Washington Electrical Rules) — Washington L&I. Required for the (06A) electrical specialty exam.
RCW Chapter 18.27 (Contractors) — State of Washington. Statutory basis for contractor registration.

Frequent Application Errors

Based on the board's own instructions and the sources cited here, the problems below are what most often stall a Washington HVAC application.

Skipping the (06A) certificate

Any HVAC work that includes electrical connections requires the (06A) HVAC/Refrigeration Specialty Electrician certificate. Working without it is unlicensed electrical contracting.

Skipping EPA 608

EPA Section 608 is federal and required before touching any refrigerant.

Confusing registration with licensing

Washington HVAC contractor registration confirms bonding and insurance, not competency. Out-of-state HVAC technicians who assume the state vouches for skill level are mistaken.

Letting the bond lapse

A lapsed bond automatically suspends the registration.

Skipping workers compensation

Washington workers compensation is monopolistic — coverage is purchased from L&I, not a private carrier.

Other Washington Trade Licenses

If the HVAC license is not the right fit, the following published Washington trade guides are also covered by CLR:

Questions Applicants Ask

Does Washington have a state HVAC exam?

No. Washington uses the same registration model for HVAC specialty contractors as for general contractors — bonding and insurance only. However, the (06A) HVAC/Refrigeration Specialty Electrician certificate (required for electrical connections) does involve a state exam.

What is the (06A) certificate?

The (06A) HVAC/Refrigeration Specialty Electrician is a Washington L&I individual certificate authorizing electrical connections on HVAC and refrigeration equipment. It requires 4,000 hours of supervised electrical experience in HVAC and passing the ICC exam at 70%.

Is EPA Section 608 required?

Yes. Federal Section 608 certification is required for any work involving refrigerants regardless of state license status.

How much is the Washington HVAC contractor surety bond?

$6,000 specialty contractor bond filed directly with L&I.

How often does the Washington HVAC contractor registration renew?

Every two years. The bond and insurance must remain in force throughout the cycle.

Primary Sources

Regulatory requirements on this page are drawn from the official board, statute, and exam-provider materials listed below.

Verified 2026-06-09 · Next scheduled review 2026-09-07