Washington Contractor Registration Requirements

01 The Washington model

Washington is not California, Florida, Arizona, Texas, Georgia, Nevada or Colorado. It is a registration jurisdiction: the state registers construction contractors to do business — it does not test them — and then regulates two trades on entirely separate statutory tracks:

• Every contractor must register — and it is NOT a licence — RCW 18.27.020 requires every contractor to register with L&I before advertising, bidding or working; unregistered work is a gross misdemeanor plus per-day and per-worksite infractions ($1,200–$10,000). The statute deliberately uses "registration", never licence. (Rule WA-REG-REQUIRED.) S-WA-18-27-020
• No examination anywhere in the registration — a full read of the ch. 18.27 table of contents and the L&I registration steps shows no examination provision; a general or specialty contractor registers on bond, insurance, workers' compensation and business identity alone. (Rule WA-NO-EXAM.) S-WA-18-27-TOC
• General vs specialty is decided by trade count — a "general" contractor works in more than one building trade or craft on a single job or permit, or superintends/consults; a "specialty" contractor works in one. The bond follows: $30,000 general, $15,000 specialty. (Rules WA-GC-SCOPE, WA-GC-BOND.) S-WA-18-27-010
• Two trades live outside the registration — electrical (ch. 19.28) and plumbing (ch. 18.106) each require their own contractor licence and certified individuals; since 2021-07-01 a general contractor cannot even bid plumbing work. (Rules WA-ELEC-CONTRACTOR, WA-PLUMB-CONTRACTOR, WA-GC-NO-PLUMBING.) S-WA-LNI-PLUMB-CONTRACTOR
• LOCAL permits are a separate system — RCW 18.27.130 preempts LOCAL contractor licences (with carve-outs for a general business licence and non-registrable contractors), but a city or county still issues the permit for the job and RCW 18.27.110 makes it verify your registration first. (Rule WA-NO-LOCAL-LICENSE.) S-WA-18-27-130

02 Who regulates

The Department of Labor & Industries administers BOTH the contractor registration (ch. 18.27) and the electrical (ch. 19.28) and plumbing (ch. 18.106) credential programmes; the Washington Legislature publishes the RCW; the Department of Revenue issues the business licence and unified business identifier (UBI); and Seattle, Spokane, Tacoma, Vancouver and Bellevue document the local permit layer. All are official sources here; Spokane is recorded through search-result snippets with a disclosed limitation.

03 State vs local

Washington is not Colorado's "no state licence at all" model and not a state-plus-locals additive model. The state registers contractors and preempts local contractor licences; cities keep their permits and their general business licences:

04 Registration vs licence

The terminology is the point. Washington's ch. 18.27 credential is a registration — a business-authorisation regime keyed to a bond and insurance, not a tested licence. The word "licence" in Washington belongs to electrical and plumbing:

• Registration is a prerequisite to sue — RCW 18.27.080 bars a contractor who was unregistered when contracted from maintaining an action; substantial compliance demands the application information, the bond and the insurance in force AT ALL TIMES. (Rule WA-REG-TO-SUE.) S-WA-18-27-080
• Advertising carries the registration number — RCW 18.27.100 requires the current number on advertising, contracts and correspondence and forbids claiming to be "bonded and insured"; violations reach $10,000. (Rule WA-AD-NUMBER.) S-WA-18-27-100
• Specialty contractors are constrained by trade — a specialty contractor may only do its registered specialty, may subcontract only work incidental to it, and may not itself hire subcontractors. (Rule WA-SC-LIMITS.) S-WA-18-27-010
• An electrical-only business is a known open question — L&I's registration page says "all construction contractors" must register while its electrical page frames registration as additionally required "if other work" — an unresolved conflict shown in full below (CONFLICT-WA-002). (Rule WA-ELEC-ONLY-REG, NOT_DETERMINED.) S-WA-LNI-ELEC-CONTRACTOR

05 Credential model

Washington issues 6 credential shapes across the registration and the two trade regimes. The split matters: a registration lets a construction business operate; a trade licence lets an electrical or plumbing business operate; a trade certificate lets an individual work at the trade:

• Registration for the business, certificates for the workers — the contractor registration is a business credential; electricians (01 journey, 02 residential, specialty, trainee) and plumbers (PL01 journey, PL02 residential, PL04 residential service, trainee, specialty) hold individual certificates. (Rules WA-ELEC-WORKER, WA-PLUMB-WORKER.) S-WA-LNI-ELECTRICIAN S-WA-18-106-020
• Each trade business names a certified individual — an electrical contractor must designate a certified master electrician or electrical administrator; a plumbing contractor must designate a full-time certified plumber. (Rules WA-ELEC-CONTRACTOR, WA-PLUMB-CONTRACTOR.) S-WA-LNI-ELEC-CONTRACTOR
• Business identity rides on DOR and SOS — a DOR business licence / UBI is required and an entity files with the Secretary of State; an inactive DOR certificate or invalid UBI is a denial ground. (Rule WA-BUSINESS-UBI.) S-WA-DOR-BIZ
• Cross-trade incidents are narrowly excused — like-in-kind appliance replacement lets an electrical contractor's certified workers do the incidental plumbing, and vice versa (RCW 18.106.150(8) / 19.28.091(8)). (Rule WA-ELEC-PLUMB-INCIDENTAL.) S-WA-18-106-150

06 Classifications

These 78 rows are the complete STATE credential surface — the general/specialty registration classes, the WAC 296-200A-016 specialty list, and the electrical and plumbing credential stacks, each mapped to the credential that carries it. Local permit classes and city business licences are deliberately NOT seeded as state rows:

Full classification scopes, conditions and rules →

07 Exemptions and thresholds

Washington has real, statutory money thresholds — the feature Colorado does not have. Three bands decide most small jobs, and none of them is a generic loophole:

• Under $500 — exempt, with carve-backs — RCW 18.27.090(9) exempts casual or minor work under $500 in the aggregate, but not when it is part of a larger operation, split to evade the threshold, or when the person holds out as a contractor. (Rule WA-MINOR-500.) S-WA-18-27-090
• Handyman — a $2,000 registered specialty, no permit work — WAC 296-200A-016(26) defines a limited specialty registration for an individual (no employees) doing residential maintenance/repair under $2,000 time-and-materials; permit-required work is OUT. (Rule WA-HANDYMAN-2K.) S-WA-WAC-296-200A-016
• Own-property and homeowner paths — RCW 18.27.090(11)–(13) exempt an owner working on their own property, owner maintenance/repairs and own employees, and an owner hiring a registered contractor; but an owner employing more than one trade on one job or permit IS a contractor. (Rule WA-OWN-PROPERTY.) S-WA-18-27-090
• Disclosure is not an exemption but it gates the small job — RCW 18.27.114 requires the NOTICE TO CUSTOMER on residential ≤4-unit jobs of $1,000 or more (commercial $1,000–$60,000), and it is a prerequisite to a lien. (Rule WA-DISCLOSURE-1K.) S-WA-18-27-114

08 Bonds

Washington is a BOND state — a surety bond is a standing condition of every credential, and impairment auto-suspends it. Four verified rows:

• Registration bond — $30,000 general / $15,000 specialty — a continuous surety bond (or a WA-branch assigned account), impaired bonds auto-suspend the registration. (Rule WA-GC-BOND.) S-WA-18-27-010
• Electrical contractor bond — $4,000 — a condition of the ch. 19.28 electrical contractor licence. S-WA-LNI-ELEC-CONTRACTOR
• Plumbing contractor bond — $6,000 — a condition of the ch. 18.106 plumbing contractor licence. S-WA-LNI-PLUMB-CONTRACTOR

09 Insurance and financial responsibility

Washington conditions its credentials on general liability AND workers' compensation — and workers' compensation is a monopolistic state fund, not private coverage:

General liability: RCW 18.27.050 (read 2026-10-04): at registration and each renewal furnish insurance or an assigned account of $50,000 property damage, $100,000 injury/death one person, $200,000 injury/death more than one person; expiration/cancellation/withdrawal automatically suspends the registration until a new policy is approved. L&I states the accepted policy forms: 'A general liability insurance policy in the amount of: $200,000 in public liability and $50,000 property damage, or $250,000 combined single limit' (renewal certificate 'for at least $250,000'). F625-001-000 shows PD $50,000 + BI $200,000 = 'total per occurrence $250,000.' RECONCILED: $50k + $200k = $250k — the statute's split limits and L&I's CSL phrasing express the same coverage (research §I). S-WA-18-27-050

Workers' compensation: L&I (read verbatim 2026-10-04): 'Washington State does not allow private workers' compensation coverage. You must purchase your coverage from L&I or be a certified self-insured employer.' 'If you have workers, whether they are employees or independent contractors, you might be required to provide workers' compensation.' Employers buy through L&I and submit quarterly reports/premiums by industry classification. The industrial insurance account number (or self-insurer number, or out-of-state certificate) is an express application item for contractor registration (RCW 18.27.030), plumbing contractor licensing (RCW 18.106.400) and electrical contractor licensing ('A workers' compensation account if the business hire employees' — L&I Electrical Contractor page). S-WA-LNI-WC

10 Renewal and continuing education

Two cadences: the registration runs a 24-month cycle with NO continuing education (verified absence — bonds and insurance are the conditions), while the trade certificates carry a 3-year cycle with continuing education:

RCW 18.27.060 (read 2026-10-04): '(1) A certificate of registration shall be valid for two years and shall be renewed on or before the expiration date.' '(4) Renewal of registration is valid on the date the department receives the required fee and proof of bond and liability insurance …' (receipt/delivery proof serves until verification arrives). '(3)' bond/insurance impairment = automatic suspension with tracked notice within 2 days (2026 c 77 added a tracked electronic option with first-use non-electronic opt-out). L&I: renew online/mail/in person with 12-digit number + UBI + $150.20; reinstatement $70.90 with proof of correction; suspension notice by certified mail within 2 days. RCW 18.27.010(15): a lapse of 30 or fewer days with bond+insurance maintained is NOT an 'unregistered contractor.' S-WA-18-27-060

Individual CE: L&I Electrician (read verbatim 2026-10-04): renew every 3 years on your birthday with '24 hours of approved continuing education credit including 8 hours of code update, 4 hours of RCW/WAC'; renewal fee doubles after expiration; 'Not renewable if expired more than 90 days; retest is your only option'; inactive status available while not working. L&I Plumbing CE (read verbatim): journey level & residential specialty renewals require '24 hours of continuing education consisting of: A minimum of 12 hours of Uniform Plumbing Code (Code), PLUS A minimum of 4 hours of Industry-Related Electrical (IRE). The remaining 8 hours can be in any Code, IRE, or Industry-Related Plumbing (IRP) area'; trainees 'at least 8 hours of continuing education every year to renew your certificate'; domestic pump/pump & irrigation: 24 h per 3-year renewal period (≥12 h plumbing, ≤12 h electrical); backflow: BAT card only, no CE; medical gas: notarized Affidavit of Continuity ~every 6 months. Plumber late ladder: double fee at renewal, retest $189.80 + certification fee after 90 days. S-WA-LNI-PLUMB-CE

11 State fees

The 17 verified state fees — the registration, electrical and plumbing schedules, each read from an official source. Every city figure is deliberately withheld:

Withheld on purpose (never guessed): the statewide electrical work-permit fee schedule, all local permit fee amounts and city business-licence fees — each named as NOT_VERIFIED or LOCAL_AUTHORITY_REQUIRED, never estimated. The CONFLICT-WA-001 plumbing figures are published only as the conflicting claim.

Full fees page →

12 Permits and inspection

• The permit issuer must verify your registration — RCW 18.27.110 forbids issuing a building permit for registrable work without verification, requires the number printed and a homeowner-risk notice, and forfeits the permit if the exemption was falsified; ch. 18.106.440 is the plumbing twin. (Rule WA-PERMIT-VERIFY.) S-WA-18-27-110
• Electrical permits are their own system — ch. 19.28 has its own permit and inspection regime, separate from the building permit. S-WA-19-28-101
• Local permit rules vary by city — Seattle, Spokane, Tacoma, Vancouver and Bellevue each publish their own permitting paths, including re-roof and mechanical-permit specifics. The five researched rows are in section 18's local table below and on the project pages.

13 Solar and photovoltaics

Solar in Washington is electrical work — there is no standalone solar licence (verified absence), with solar-thermal handled under the plumbing/HVAC/R specialties:

• No generic solar licence — verified absence — Verified by enumerating all 63 WAC 296-200A-016 specialties (read in full 2026-10-04): no solar classification exists; solar-related scope appears only inside HVAC/R (28, 'systems that utilize solar energy') and boiler/steam/process piping (4, 'solar heating equipment associated with these systems'). Photovoltaic installation is 'electrical construction trade' work → electrical contractor license (general 01 = 'all phases and all types,' unambiguously qualified). The residential (02) specialty's WAC scope EXCLUDES '(D) Interconnected electric power production sources not connected to equipment that supplies one- and two-family dwellings, or multifamily dwellings of types III, IV or V construction, or ancillary structures' — whether 02 may install rooftop PV tied to the dwelling's own equipment is genuinely ambiguous. Seattle: 'If your solar PV system is rated under 7.7KW, you can apply online without plan review. However, you must have your plans and the manufacturer installation instructions available at the job site during your electrical inspection.' (Rule WA-SOLAR-CREDENTIAL.) S-WA-WAC-296-46B-920
• The residential-electrical (02) rooftop-PV reading is OPEN — WAC 296-46B-920(2)(a)(ii)(D) excludes interconnected power-production sources not connected to dwelling-supplying equipment; whether residential-class (02) electricians may do rooftop PV inside a dwelling is genuinely ambiguous, so the rule returns NOT_DETERMINED. Rule WA-ELEC-02-SOLAR.
• Who installs otherwise — an electrical contractor (01 unambiguous) + certified electricians; solar-thermal runs through the plumbing/HVAC/R specialties. S-WA-LNI-ELEC-CONTRACTOR

Solar installation project page →

14 Official lookup

Before hiring — or before claiming your own credential status — check the official lookups. They are linked, not mirrored, so the status vocabulary is whatever the agency publishes:

• Washington State Department of Labor & Industries (L&I) — https://lni.wa.gov/licensing-permits/contractors/hiring-a-contractor/verify-contractor-tradesperson-business S-WA-LNI-VERIFY
• City of Seattle — Seattle Department of Construction and Inspections (SDCI) — https://cosaccela.seattle.gov/ S-WA-LNI-VERIFY

The L&I contractor lookup covers the ch. 18.27 registration; electrical and plumbing credentials have their own L&I verification paths. Local lookups for the five researched cities are named with their local rows.

15 Project examples

Every project page runs the deterministic rule first: missing facts return NOT_DETERMINED, never a forced answer. Five routes are deliberately absent (policy "absent", not missing): exemptions, permit-fees, exam-requirements, local-licensing and projects/home-addition — each would duplicate what is already here.

16 Local layer (five jurisdictions)

LOCAL EXAMPLES — NOT STATEWIDE. Five regimes were researched from official pages (Spokane is held pending — snippet-only, so its row is withheld); they do not generalize. Cities issue permits and general business licences; the state registration remains the contractor authority:

17 Scope assertions

Scope is recorded as typed assertions — officially included, officially excluded, requires another classification, not determined, or our interpretation (always marked). There is no boolean "covers":

• Officially excluded washington:sp-hvac-r — Line Voltage Controllers Or Disconnects External To Hvac Equipment (WAC 296-46B-920(2)(f)) S-WA-WAC-296-46B-920
  The external-electrical boundary for HVAC replacement: line-voltage work outside the unit is ELECTRICAL contracting, not HVAC specialty work (research §N.4).
• Officially included washington:plumber-journey-pl01 — Potable Water Distribution Fixtures Traps Drains And Water Heaters Within Property Lines (RCW 18.106.020; L&I Plumber Certification program) S-WA-LNI-PLUMBER-CERT
  The individual plumbing boundary — water heaters inside the trade (water-heater page), outside-building lines outside it (research §D.4/§N.5).
• Officially included washington:specialty-contractor — Operations Outside The General Contractor Definition Single Registered Specialty (RCW 18.27.010(12)) S-WA-18-27-010
  The specialty boundary: scope = the registered specialty + incidental subcontracting only. Multi-trade work → general class (research §D.1/§7).
• Officially included washington:sp-framing-rough-carpentry — Roof Decking Truss Members And Rafters And Structural Carpentry (WAC 296-200A-016(23)) S-WA-WAC-296-200A-016
  The positive half of the roofing/structure boundary — the specialty that CAN repair roof structure (research §N.1).
• Officially excluded washington:sp-handyman — Any Work Requiring A Building Permit Or Work With Employees (WAC 296-200A-016(26)) S-WA-WAC-296-200A-016
  The handyman band: a specialty with hard limits, distinct from the pure sub-$500 registration EXEMPTION (RCW 18.27.090(9)) (research §G.4/§N.2).
• Officially excluded washington:sp-roofing — Structural Repair Of Trusses Beams Or Joists (WAC 296-200A-016(44)) S-WA-WAC-296-200A-016
  The roofing specialty's own statutory-style limit — the structural-repair question on the roof-replacement page is a negative from the credential's own text, not our reading (research §N.1).
• Officially included washington:sp-hvac-r — Heating Ventilating Air Conditioning Systems And Attached Services (WAC 296-200A-016(28)) S-WA-WAC-296-200A-016
  HVAC's whole statewide answer: a registration specialty, not a license — plus the external-electrical boundary in SCOPE-WA-HVAC-NO-EXTERNAL-DISCONNECT (research §10/§N.4).
• Officially included washington:electrical-contractor-general — All Phases And All Types Of Electrical And Telecommunications Installations (WAC 296-46B-920(1); RCW 19.28.041) S-WA-WAC-296-46B-920
  The unambiguous electrical credential — general (01) is the one qualified for rooftop PV without interpretive strain (research §D.3/§O).
• Officially included washington:general-contractor — More Than One Building Trade Or Craft On A Single Job Or Permit Or Superintending Consulting (RCW 18.27.010(5) / (1)(a)) S-WA-18-27-010
  The general-contractor class definition — Washington uses 'registration' and 'class', never a 'general contractor license' (research §B/§D.1).
• Requires another classification washington:sp-appliances-equipment — Installation Or Replacement Of Dishwashers Hot Water Tanks And Garbage Disposals (WAC 296-200A-016(1)) S-WA-WAC-296-200A-016
  The water-heater page's decisive text: the appliance specialty may NOT do the job — plumbing and/or electrical credentials are required instead (research §N.5).

18 Sources

Every source used on this page: official URL, publishing authority, retrieval date and verification date. Commercial contractor sites, SEO directories and law-firm marketing pages were discovery leads only and are never cited as authority. The RCW and WAC text was read from the official app.leg.wa.gov publications; L&I pages and the F625 guide are official; Spokane is recorded with its disclosed limitation.

19 Last verified

20 Known conflicts and limitations