What is a Washington contractor license and who needs one?

A Washington contractor license — technically a contractor registration — is required for any construction work in the state, with no dollar threshold. The Washington Department of Labor & Industries (L&I) issues registrations under RCW 18.27, the Registration of Contractors Act. There are two designations: general contractor (work in two or more unrelated trades on a single project) and specialty contractor (limited to one of 60-plus specialty designations under WAC 296-200A). To register, you need a $30,000 surety bond ($15,000 for specialty), liability insurance of $200,000 public liability plus $50,000 property damage (or $250,000 combined single limit), a UBI number from the Department of Revenue, and a workers’ comp account if you employ anyone. No exam is required at the base registration level. The fee is $141.10, the timeline is typically 4 to 8 weeks from start to active number, and renewal is every 2 years for the same $141.10.

Every fact below traces to RCW 18.27 or the L&I Contractors program. Every fee and figure is verified against L&I’s published 2026 schedule. Verify any claim against the source before you pay a fee.

General vs specialty contractor: which Washington registration you need

Washington draws a clean line between the two designations under RCW 18.27.010. A general contractor performs or supervises work involving two or more unrelated building trades on the same project. A specialty contractor performs work in a single specialty designation only. Pick wrong and any out-of-scope work is an enforcement risk.

How to pick: If a single project ever calls for two unrelated trades (framing plus electrical, drywall plus plumbing, etc.), register as a general contractor. If every project stays inside one trade, the specialty designation costs half on the bond and is faster to underwrite. Specialty registrants who later branch into multi-trade work must upgrade to general before bidding.

Specialty designations under WAC 296-200A

Washington recognizes 60-plus specialty designations defined in WAC 296-200A. Each registration covers one designation. The full list runs alphabetically from acoustical contractor through wrecking contractor.

A sample of the most common designations used by Washington applicants:

Electrical, plumbing, and refrigerant work carry extra licensing on top of the L&I contractor registration. Electrical contractors need a separate electrical contractor license and at least one certified electrician on staff. Plumbing contractors need a plumbing contractor registration plus L&I plumber certification. Refrigerant handling requires federal EPA Section 608 certification. The base L&I contractor registration does not cover any of these on its own.

Application requirements for a Washington contractor license

Every L&I application requires the same five elements regardless of whether you register as general or specialty. The bond and insurance dollar amounts change, but the underlying checklist does not.

Continuous surety bond on the L&I form

Per RCW 18.27.040, every applicant files a continuous surety bond with the department. General contractors post $30,000. Specialty contractors post $15,000. The bond runs on L&I’s specific form — generic surety bond paperwork does not satisfy the statute. The bond stays in place for the life of the registration and backs consumer claims for unpaid wages, unpaid materials, and breach-of-contract damages.

Liability and property damage insurance

Per RCW 18.27.050, applicants choose between two coverage structures: a split-limit policy with $200,000 public liability plus $50,000 property damage, or a $250,000 combined single limit policy. L&I must be named as a certificate holder so any policy lapse triggers automatic notification.

Unified Business Identifier (UBI)

The Washington Department of Revenue issues every business a UBI number through the Business Licensing Service. The 9-digit number ties together state agencies including L&I, the Employment Security Department, and the Secretary of State. The UBI must be active before L&I will process the contractor registration.

Workers’ compensation account

Washington runs a monopolistic state-fund workers’ compensation system through L&I. Any contractor with employees opens a workers’ comp account at the same time as registration. Sole proprietors with no employees can elect optional coverage but are not required to carry it. Subcontractors without their own L&I workers’ comp coverage are presumed employees of the hiring contractor for premium-assessment purposes.

Business entity registration with the Secretary of State

The registration is held by a legal entity, not an individual. LLC and corporation filings go through the Washington Secretary of State. Sole proprietorships and general partnerships register directly with the Department of Revenue without a separate Secretary of State filing.

How to get a Washington contractor license: the 8-step process

Most applicants finish the full path in 4 to 8 weeks. Bond underwriting and L&I processing are the two longest phases, and in-person filing at an L&I office can shave that to same-day approval.

1. Register your business and pull a UBI

   File the Business License Application with the Washington Department of Revenue through the Business Licensing Service. The application costs a low double-digit fee and produces your 9-digit Unified Business Identifier (UBI), which every other agency uses to identify your business. Add city endorsements at this stage if you know your operating jurisdictions — Seattle, Bellevue, Tacoma, Spokane, and Vancouver each have their own business license. The UBI must be active before L&I will accept a contractor registration application.

2. Form your legal entity with the Secretary of State

   Most Washington contractors operate as a single-member LLC, a Washington corporation, or a sole proprietorship. The LLC is the most common choice because it provides liability protection without double taxation. LLC formation at the Washington Secretary of State runs $200 for online filing. Sole proprietors skip this step but lose personal liability protection. Pull a free EIN from the IRS the same day you form the entity.

3. Decide between general and specialty registration

   Per RCW 18.27.010, register as a general contractor only if you will ever bid work involving two or more unrelated trades on the same project. Register as a specialty contractor if every project stays inside a single trade. Specialty registrations cost half on the bond ($15,000 vs $30,000) and are faster to underwrite, but switching to general later requires posting the higher bond and submitting an amendment.

4. Obtain your continuous surety bond

   Shop the surety market for a bond on L&I’s specific form. General contractor bonds run $300 to $900 annually depending on credit. Specialty bonds run $150 to $450 annually. Surety carriers underwrite based on personal credit history, business financials, and trade history. Solo applicants with thin credit may pay 3 to 10 percent of the bond face value annually; established contractors with strong credit pay 1 to 2 percent. The bond is continuous — if it lapses, the registration suspends automatically until coverage is restored.

5. Bind liability and property damage insurance

   Get a policy that matches the RCW 18.27.050 minimums: $200,000 public liability plus $50,000 property damage, or $250,000 combined single limit. Name L&I as the certificate holder so any lapse, cancellation, or non-renewal triggers an automatic notification to the department. Most carriers price a starter policy at $1,000 to $3,500 per year depending on revenue, trade risk, and claims history. Roofing and excavation premiums sit at the high end; painting and flooring sit at the low end.

6. Open your L&I workers’ comp account (if you have employees)

   Washington operates a monopolistic state-fund workers’ comp system, so you cannot buy private workers’ comp from a commercial carrier. Open the account through L&I when you hire your first employee. Sole proprietors with no employees can elect optional coverage but are not required to carry it. Subcontractors who do not carry their own L&I coverage are presumed employees of the hiring contractor for premium assessment, which is the most common audit finding against Washington general contractors.

7. Submit the L&I contractor registration application

   File the Contractor Registration Application with the $141.10 fee at any L&I office. The application requires the bond original, the insurance certificate, the UBI, the workers’ comp account number (if applicable), and a notarized signature from the owner or responsible managing individual. By mail, processing runs 3 to 4 weeks. In person at an L&I office, registrations can be issued same-day with all paperwork in order.

8. Receive your registration number and start work

   Once L&I issues the registration, the firm receives a 12-character contractor registration number that must appear on every advertisement, contract, bid, vehicle, and invoice. The firm also appears in the public L&I Verify a Contractor lookup tool. Renewal is every 2 years on the registration anniversary, and the bond and insurance must remain continuously active during the registration period.

Surety bond: how it protects consumers

The L&I surety bond is the central consumer-protection mechanism in Washington’s registration system. Because the state does not require a competency exam, the bond does the heavy lifting in screening out undercapitalized operators and giving harmed consumers a recovery path.

Who can claim against your bond

Per RCW 18.27.040, the bond is held in trust for the benefit of persons damaged by the contractor. Claims fall into four categories: unpaid employee wages, unpaid materials suppliers and subcontractors, breach-of-contract damages to property owners, and judgments from successful civil suits. Order of priority runs: laborers and employees first, then state and local taxes, then materials suppliers and subcontractors, then property-owner damages.

Why bonds get pulled

Surety carriers cancel bonds when underwriting changes: a missed payment, a deteriorating credit profile, or a paid claim that exceeds the carrier’s appetite. A canceled bond suspends the L&I registration automatically under RCW 18.27.040. The registration restores once a new bond is on file, but any work performed during the gap is unregistered work and exposed to the same penalties as never having registered at all.

Increased bond amounts

L&I can require an increased bond — up to three times the standard amount ($90,000 for general, $45,000 for specialty) — if a contractor has paid claims, a history of complaints, or an audit finding. Most registrants never trigger an increase, but contractors with even one paid bond claim should expect the surety to raise the premium or non-renew the next term.

Liability insurance and workers’ compensation

Washington’s insurance requirements sit on two pillars: a public liability and property damage policy required by L&I, and workers’ comp coverage administered exclusively by the state fund.

Public liability and property damage minimums

The L&I minimums are the floor — most commercial owners, general contractors hiring subs, and lenders require $1 million per occurrence and $2 million aggregate as a condition of contract. Carrying only the L&I minimum disqualifies the firm from most institutional work.

Workers’ compensation through L&I

Washington is one of four monopolistic workers’ comp states, alongside North Dakota, Ohio, and Wyoming. Contractors cannot buy workers’ comp from a commercial carrier — coverage runs exclusively through the L&I state fund. Premium is paid quarterly based on hours worked per risk classification. The standard construction risk classifications include framing, roofing, electrical, plumbing, HVAC, painting, drywall, and excavation, each with its own base rate.

Sole proprietors with no employees can elect optional coverage at a reduced rate. Subcontractors who do not carry their own L&I coverage are treated as employees of the hiring contractor for premium-assessment purposes. The L&I workers’ comp audit is the most common compliance finding for Washington general contractors.

Setting up your contracting business in Washington

The L&I registration is held by a firm, not an individual. Entity formation, tax registration, and city endorsements all happen before the contractor registration goes through.

Entity choice

Most Washington contractors run as a single-member LLC or a Washington corporation. The LLC is simpler, gives liability protection, and is taxed as a pass-through. Sole proprietorships and general partnerships are still allowed but expose personal assets to business liabilities — not recommended for active construction firms. Forms go through the Washington Secretary of State.

Federal EIN and Washington tax registration

Pull a free EIN from the IRS. Register for the Washington Business and Occupation (B&O) tax through the Department of Revenue. Washington has no state income tax, but the B&O tax applies to gross receipts at industry-specific rates. Construction firms typically file under the Retailing classification (when working directly for a consumer) or the Wholesaling classification (when working as a subcontractor on a prime contract).

Sales tax collection on construction

Construction contractors collect retail sales tax on the full contract price for retail-classified work (direct-to-consumer remodeling, home construction, repair). The contractor pays sales tax on materials at the supplier or accrues use tax if no tax was paid at purchase. Wholesale-classified work (subcontracting to a prime) is exempt from retail sales tax on labor but still requires the prime contractor to provide a reseller permit.

License renewal every 2 years

L&I contractor registrations expire 2 years from the issue date per RCW 18.27.060. Renewal requires the same $141.10 fee, an active bond, and an active insurance certificate on file. There is no continuing education requirement at the base registration level — trade-specific certifications (electrician, plumber) have their own CE rules.

Renewal process

L&I mails a renewal notice 30 to 60 days before expiration. Renewals can be filed online through the L&I portal, by mail, or in person. Confirm that the bond and insurance certificate on file are current before submitting. A renewal with a lapsed bond or insurance is rejected and the registration moves to suspended status.

Lapsed and suspended registrations

If the bond lapses or the insurance certificate expires at any point during the registration, L&I suspends the registration automatically. The firm cannot legally advertise, bid, or perform work as a contractor while suspended. Reinstatement requires posting a current bond and insurance certificate, plus a $66.60 reinstatement fee. Active contracts during the gap expose the firm to disgorgement claims and consumer protection actions.

Reinstatement after a long lapse

A registration that has been expired or suspended for more than 12 months may require a full new application rather than reinstatement. The firm reapplies with current bond, insurance, UBI, and workers’ comp documentation and pays the $141.10 new-registration fee.

Penalties for unregistered or out-of-scope work

Washington takes unregistered contracting seriously. The penalty schedule under RCW 18.27.020 and RCW 18.27.340 covers everything from advertising without a registration to performing work outside the scope of an existing registration.

Criminal penalties

Advertising, offering to do work, submitting a bid, or performing any work as a contractor without an active registration is a gross misdemeanor under RCW 18.27.020. A first offense can result in fines up to $5,000, jail time up to 364 days, or both. Repeat offenses escalate to higher fines and longer jail time.

Civil penalties

L&I can assess civil penalties up to $1,000 per day of unregistered contracting under RCW 18.27.340. Repeat civil penalties stack and the department can pursue injunctions to stop unregistered operators from continuing to bid work. Civil penalties run in addition to any criminal exposure.

Contract unenforceability

Per RCW 18.27.080, an unregistered contractor cannot bring or maintain any action in any Washington court for the collection of compensation for performance of any work that requires registration. The contractor can be sued by the homeowner but cannot sue the homeowner for unpaid invoices. This single rule is the most expensive consequence of working unregistered.

Out-of-scope work by registered contractors

A specialty contractor who performs general contracting work (two or more unrelated trades on a single project) faces the same penalties as an unregistered contractor under RCW 18.27.340. Upgrading from specialty to general before the first multi-trade job is the only safe path.

Local jurisdiction rules across Washington

The L&I registration is statewide, but every Washington city runs its own business license regime through the state Business Licensing Service. Pulling a permit in any jurisdiction generally requires three things: an active L&I registration, the local city business license, and a permit-specific application through the local building department.

Most city business licenses can be added as an endorsement during the state Business Licensing Service application, which means a single filing covers both the UBI and the city license. Seattle is the highest-volume target for commercial work and has the most demanding local rules. Beyond the basic business license tax certificate, Seattle requires a separate Contractor Trade Permit through the Seattle Department of Construction and Inspections for regulated trades, and any project pulling permits in the city requires the contractor to be added to the building permit application. Bellevue and the Eastside (Redmond, Kirkland, Issaquah, Renton) each have separate business licenses but share simpler permit requirements than Seattle. Tacoma and Pierce County require city licenses but no county-level contractor registration. Spokane and Spokane Valley are separate municipalities with separate business license requirements. Vancouver across the river from Portland has a flatter fee structure but a competitive local permit market because of cross-border work with Oregon. Operating without the city business license is a separate violation from operating without the L&I registration — the penalties stack.

Total cost of a Washington contractor license in 2026

Total first-year cost typically runs $1,500 to $4,500 for a general contractor and $1,000 to $3,000 for a specialty contractor. The two biggest variables are the surety bond premium (a function of personal credit) and the liability insurance premium (a function of trade risk and revenue). Most applicants finish the full registration in 4 to 8 weeks.

L&I registration fees

Bond premiums by designation

Other initial and ongoing costs

Beyond L&I and bond costs, budget for: LLC formation ($200 with the Secretary of State), Business Licensing Service application ($90 for the base filing plus city endorsements), liability insurance ($1,000 to $3,500 per year for the L&I minimum; $2,500 to $6,000 for the $1M per-occurrence policy most lenders require), city business licenses ($50 to $250 per jurisdiction per year), and workers’ comp premiums (variable by trade and payroll, billed quarterly through L&I). Total estimated first-year cost: $1,500 to $4,500 for a general contractor; $1,000 to $3,000 for a specialty contractor.

Applicants whose surety bond underwriting drags on thin credit, or who file the application by mail rather than in person at an L&I office, often stretch to 8 to 10 weeks. The fastest realistic path is roughly 2 weeks: form the LLC and pull the UBI in week one, bind bond and insurance, then file the registration in person at an L&I office for same-day issuance.

Common pitfalls to avoid

Beyond the application itself, four pitfalls trip up registered firms during day-to-day operations:

• Specialty registrants taking on multi-trade work. A specialty contractor who performs work in two or more unrelated trades on the same project is operating out of scope under RCW 18.27.020 — the same penalty exposure as an unregistered contractor. The fix is to upgrade to general registration before bidding any multi-trade project. Posting the $30,000 bond and amending the L&I file typically clears in 1 to 2 weeks.
• Letting bond or insurance lapse. L&I automatically suspends a registration the moment a bond cancels or an insurance certificate expires. The contractor cannot legally advertise, bid, or perform work during the suspension. Any work performed during the gap is unregistered work and exposed to the full $5,000 gross-misdemeanor penalty plus $1,000-per-day civil exposure. Calendar reminders 60 days before bond and insurance anniversaries are the single most useful operational control.
• Subcontractors treated as employees in L&I audits. Subcontractors who do not carry their own active L&I workers’ comp coverage are presumed employees of the hiring contractor for premium assessment. The hiring general contractor gets billed retroactively for workers’ comp premiums on every hour the sub worked. The fix is to confirm every sub’s L&I registration and workers’ comp account number before they set foot on the jobsite, and to file a 1099-NEC each year.
• Registration number missing from advertisements and contracts. RCW 18.27.114 requires the 12-character contractor registration number to appear on every advertisement, contract, bid, vehicle, and invoice. Missing it on a single ad triggers up to a $200 infraction. Multiple missing instances stack and L&I treats the pattern as a compliance flag during the next audit. The fix is to add the registration number to every template (proposal, contract, invoice, business card, vehicle wrap, website footer, social profile) before the first job goes out.

Bottom line

Washington’s L&I contractor registration is one of the most accessible state systems in the country. There is no exam, the fee is a flat $141.10, and the timeline is 4 to 8 weeks — or same-day in person at an L&I office. The trade-off is that the bond and insurance are continuous live conditions, not one-time paperwork, and the consumer-protection penalty schedule is sharp. Pick the right designation (general for multi-trade work, specialty for single-trade work), post the right bond ($30,000 / $15,000), bind the right insurance ($200,000 + $50,000 or $250,000 combined), and renew every 2 years. Get those four pieces right and you hold a registration that travels to every county in Washington.

Resources and next steps

Bookmark these for the application, renewal, or compliance questions:

• L&I Contractors program — application packet, fee schedule, verify tool
• RCW 18.27 — statutory basis
• WAC 296-200A — specialty designations and administrative rules
• Washington Department of Revenue — UBI, Business Licensing Service, B&O tax
• Washington Secretary of State — LLC and corporation formation
• L&I Verify a Contractor — public license lookup

For a state-by-state overview, see our national general contractor license guide. For a comparison to a class-tier system, see our Virginia contractor license guide.