Payroll

Washington prevailing wage and certified payroll rules

Washington's prevailing wage law (RCW 39.12) covers public works for the state and every local government with no minimum contract size. Every contractor and sub files an intent before getting paid, an affidavit before retainage is released, and certified payroll with L&I at least once a month.

An office manager and contractor review invoices with a calculator and laptop in a construction office.
Review invoices, committed costs, and cash timing together before making project decisions. AI-generated illustration.

Short answer: Washington runs a paperwork-heavy prevailing wage program. RCW 39.12.020 requires prevailing wages on public works for the state and any county, municipality, or political subdivision, and on public building service maintenance contracts. The statute sets no dollar floor for the wage requirement. The Department of Labor and Industries (L&I) sets rates by county, and the filings run through L&I's online system: a Statement of Intent to Pay Prevailing Wages, monthly certified payroll, and an Affidavit of Wages Paid at the end. Federally funded jobs also carry Davis-Bacon.

Washington prevailing wage at a glance
RuleWashington
State lawRCW 39.12
Covered workPublic works of the state and local governments, plus public building service maintenance contracts
Dollar thresholdNone for the wage requirement; jobsite posting of the approved intent on contracts over $10,000
Who sets ratesL&I's industrial statistician, from collective bargaining agreements or wage surveys, by county
Rate effective dateGenerally the prime's bid due date; the award date if the contract is not awarded within 6 months
Before paymentApproved Statement of Intent from the prime and every sub
Certified payrollFiled with L&I at least once a month; records kept 3 years after acceptance
At closeoutApproved Affidavit of Wages Paid before retainage is released
PenaltyGreater of $5,000 or 50 percent of the violation, plus 1 percent a month interest

How Washington rates are set and looked up

Under RCW 39.12.015, the industrial statistician at L&I makes every prevailing wage determination. Where a trade is covered by collective bargaining agreements, the statistician adopts the hourly wage, usual benefits, and overtime paid under those agreements; if more than one agreement for a trade applies in the county, the higher rate prevails. Trades without an agreement are set from wage and hour surveys or other appropriate methods. A separate method applies to some affordable housing, shelter, and weatherization programs.

L&I's Wage Lookup has two tools: journey-level rates by trade and county, and apprentice rates by trade, county, and program. Rates lock on a date, so pick the right one. L&I says it is generally the date the prime's bid is due, or the award date if the contract is not awarded within six months of bid. Subcontractors use the prime's effective date. Contracts awarded without bidding use the signing date, and GC/CM and design-build projects have their own rules.

Intents, affidavits, and the payment hold

The filing sequence is what trips up firms new to Washington public work. RCW 39.12.040 says no payment can be made on a public works contract until the contractor and each subcontractor have submitted a Statement of Intent to Pay Prevailing Wages approved by L&I's industrial statistician. On contracts over $10,000, the intent lists your contractor registration number, the rate for each classification, and the estimated number of workers in each. After final acceptance, every contractor files an Affidavit of Wages Paid, and the agency cannot release retained funds until the affidavits are certified.

  1. Right after award: file your intent through L&I's online system before work starts, and make sure every sub does the same.
  2. On site: on contracts over $10,000, post the approved intent where workers can see it, with the industrial statistician's address and phone number.
  3. Monthly: file certified payroll with L&I at least once a month.
  4. At closeout: file affidavits for your company and confirm every sub's affidavit is approved before you chase release of retainage.

Small jobs get a shortcut. L&I offers combined Intent and Affidavit forms for projects up to $5,000 including tax, with no subcontractors, paid in a single payment, and not split into phases. RCW 39.12.070 caps intent and affidavit fees at $40 each and lets L&I set the exact amount by rule; L&I's page notes no filing fee on combined forms of $5,000 or less. Check L&I for the current fee before you file.

There is also a training rule. L&I says contractors must attend its public works and prevailing wage training unless they have been in business for three or more years and completed three or more public works projects.

Certified payroll and apprentices

RCW 39.12.120 requires every contractor, subcontractor, and employer on a public work to file a copy of its certified payroll records at least once a month, preferably through L&I's online system, or in a format L&I approves. L&I describes it as filing accurate weekly payroll records online at least monthly. Missing filings are a violation of RCW 39.12.050, and records must be kept for three years from the date the project is accepted. The federal WH-347 is not the Washington filing; on a job with federal money you may need to report both ways.

Apprentice utilization is a separate statute. RCW 39.04.320 requires at least 15 percent of labor hours to be performed by apprentices on covered projects. State agency projects estimated at $1 million or more are covered, along with school districts and four-year universities at $1 million or more and Department of Transportation projects at $2 million or more. For municipalities, the threshold drops from $2 million to $1.5 million for contracts advertised on or after July 1, 2026, and to $1 million on or after July 1, 2028. Utilization is tracked from certified payroll data. Our guide to apprentice rules on prevailing wage projects covers ratio and registration basics.

Penalties and complaints

Under RCW 39.12.065, a complaint of unpaid prevailing wages must be filed within 60 days of acceptance to support penalties, though L&I can still investigate and recover wages on complaints filed within two years. If L&I finds a violation, the contractor owes back wages with interest at 1 percent a month and a civil penalty of the greater of $5,000 or 50 percent of the total violation on the contract. It cannot bid public works until the penalty is paid, and a second violation within five years brings an additional two-year bid ban. L&I may reduce penalties but not interest.

Say an L&I audit finds $14,000 in underpaid wages on a $700,000 school job. Fifty percent is $7,000, which is more than $5,000, so the penalty would be $7,000 on top of wages and interest. The statute offers a smaller hit for early resolution: pay the wages, interest, and the greater of $1,000 or 20 percent of the violation after an investigation starts but before a notice of violation, and the civil penalty does not apply. That route is closed if you had a notice of violation reach final judgment in the last five years, and using it a second time within five years brings the full penalty and a two-year bid ban.

How Washington differs from Davis-Bacon

  • Coverage: Washington covers state and local public works with no wage threshold; Davis-Bacon covers federally funded or assisted contracts over $2,000.
  • Rates: Washington rates come from L&I by county, largely from collective bargaining agreements; federal rates come from wage determinations on SAM.gov.
  • Filing: Washington uses an L&I online system for intents, affidavits, and monthly payroll; Davis-Bacon requires weekly certified payroll to the contracting agency, and the WH-347 is optional.
  • Money hold: Washington ties progress payments to approved intents and retainage release to approved affidavits.

See also the Washington contractor license guide, Washington mechanics lien rules, and Washington prompt payment rules. Smart Business Automator tracks each sub's intent and affidavit status and prepares payroll data for filing; see certified payroll automation.

Frequently asked questions

Is there a dollar threshold for Washington prevailing wage?

Not for the wage requirement itself. RCW 39.12 covers public works of the state and local governments regardless of size. Some paperwork rules use dollar amounts, such as jobsite posting on contracts over $10,000 and combined intent and affidavit forms on projects up to $5,000.

How often is certified payroll filed in Washington?

At least once a month with L&I, preferably through its online system. Records must be kept for three years from the date the project is accepted.

What is a Statement of Intent to Pay Prevailing Wages?

A filing each contractor and subcontractor makes with L&I after award. The public agency cannot pay on the contract until intents are approved. An Affidavit of Wages Paid is filed after acceptance and must be approved before retainage is released.

Where do I look up Washington prevailing wage rates?

Use L&I's Wage Lookup for journey-level rates by trade and county and apprentice rates by trade, county, and program. The rate generally locks on the prime's bid due date.

What is the penalty for a Washington prevailing wage violation?

Back wages with 1 percent a month interest and a civil penalty of the greater of $5,000 or 50 percent of the total violation. The contractor cannot bid public works until the penalty is paid, and a repeat within five years adds a two-year ban.

Do Washington public works require apprentices?

On covered projects, yes. RCW 39.04.320 requires at least 15 percent of labor hours by apprentices on state agency, school district, university, WSDOT, and larger municipal projects above the listed dollar thresholds.

Sources

  1. Washington State Legislature: RCW 39.12.020, Prevailing rate of wage
  2. Washington State Legislature: RCW 39.12.015, Industrial statistician determinations
  3. Washington State Legislature: RCW 39.12.040, Statement of intent and affidavit
  4. Washington State Legislature: RCW 39.12.065, Complaints, penalties, and debarment
  5. Washington State Legislature: RCW 39.12.070, Fees
  6. Washington State Legislature: RCW 39.12.120, Certified payroll filing
  7. Washington State Legislature: RCW 39.04.320, Apprenticeship utilization
  8. Washington Department of Labor and Industries: Public Works Projects
  9. Washington Department of Labor and Industries: Prevailing Wage Rates
  10. U.S. Department of Labor, Wage and Hour Division: Form WH-347

Laws and rates change. Confirm current requirements with the state agency before you bid, file, or pay. This page is general information, not legal advice.

Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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