The statute, in one paragraph
The Davis-Bacon Act (DBA), codified at 40 U.S.C. §§ 3141-3148, requires contractors and subcontractors on federal construction contracts over $2,000 to pay laborers and mechanics the locally prevailing wages and fringe benefits as determined by the Secretary of Labor. The implementing regulations are at 29 CFR Parts 1, 3, and 5. The Davis-Bacon Related Acts (DBRA) extend the same requirement to federally assisted construction — IIJA/BIL-funded work, HUD, FHWA, USDA Rural Development, and roughly sixty other program statutes. The 2023 DOL rulemaking (88 FR 57526, effective October 23, 2023) restored the three-step method for determining prevailing rates and expanded coverage to demolition, surveying (in certain cases), and truck drivers making material deliveries that are "integral" to construction.
Wage determinations live on SAM.gov
Prevailing wage rates are published as Wage Determinations (WDs), available at SAM.gov/wage-determinations. Every solicitation under DBA/DBRA must include the applicable WD, incorporated by reference or attached as an exhibit (FAR 52.222-6, Construction Wage Rate Requirements). WDs are published in four construction categories: Building, Residential, Highway, and Heavy. A single project can cross categories — a federal courthouse with site utility work typically requires both a Building WD and a Heavy WD, applied by scope.
WDs are labeled with a state, county, and type code (e.g., CA20210001 is California, 2021 sequence, number 0001). The "20210001" portion identifies the wage survey data the rates are based on; the rates get modified over time through a series of Mod numbers (Mod 1, Mod 2, etc.). Always verify you are bidding against the current Mod — the WD in effect at bid opening governs the whole contract unless the award happens more than 90 days after bid opening, in which case the WD that was current on bid-opening day still governs (29 CFR 1.6).
How to read a WD for electricians (example: CA20210001, Modern Mod)
A typical electrician line on a California Building WD reads something like:
Rates: $57.85 BASE
Fringes: $28.42 H&W + PENSION + TRAINING + VAC
Total package: $86.27/hr (straight time)
The classification header references the union local (IBEW 0011, identifier 001). "BASE" is the cash hourly wage; "Fringes" is the aggregated fringe benefit package the contractor must either pay into bona fide benefit plans or pay to the worker in cash on the paycheck (29 CFR 5.23). The total hourly package — base plus fringe — is the minimum the contractor must deliver.
Most WDs also list classification zones for travel pay and overtime conditions. CWHSSA (Contract Work Hours and Safety Standards Act, 40 USC 3701-3708) requires time-and-a-half after 40 hours per week. The WD itself may require overtime after 8 hours per day in states like California — read the fine print on the determination.
Fringe benefits: cash vs. plan payments
The fringe portion of the total package can be paid two ways, and the choice drives both compliance and cost (29 CFR 5.23-5.32):
- Cash in the paycheck — treated as wages, subject to FICA, FUTA, SUTA, and workers' comp premium. A $28.42 fringe paid in cash costs the employer roughly $28.42 × 1.14 = $32.40 fully loaded.
- Contributions to bona fide plans — health & welfare, pension, apprenticeship, vacation. Plan contributions are not subject to payroll tax. The same $28.42 paid to plans costs $28.42 flat.
The spread between cash and plan fringe delivery runs 12-16% of the fringe amount. On a 40,000-hour electrical contract with a $28 fringe, that is $134,000 to $180,000 in payroll-burden savings if the fringe is delivered through qualified plans rather than cash. Non-union shops bidding federal work who default to "cash fringe on the paycheck" routinely lose this spread.
Apprentice-to-journeyman ratios
Apprentice rates on a WD are expressed as a percentage of journeyman (e.g., "1st year 50%, 2nd year 55%, 3rd year 65%, 4th year 75%"). But the ratio at which apprentices may be employed on a federal job is not on the WD — it is governed by 29 CFR 5.2(n) and 29 CFR 5.5(a)(4) and is set by the registered apprenticeship program (DOL Office of Apprenticeship or a state apprenticeship agency).
A typical IBEW inside-wireman program is registered at a 1:1 ratio — one apprentice for every one journeyman on the job. Some programs are 1:2 or 1:3. A contractor who builds a bid crew rate assuming 1 journeyman and 3 apprentices on a 1:1 program is out of compliance and, when the certified payrolls are reviewed, will be required to pay journeyman rates retroactively to the over-ratio apprentices. That is a direct hit to margin, plus liquidated damages under CWHSSA.
A complete electrician crew buildup — California Building WD
| Role | Base | Fringe | Total pkg | Labor burden (1.22x) | Billed rate |
|---|---|---|---|---|---|
| Journeyman | $57.85 | $28.42 | $86.27 | $98.92 | $98.92 |
| 4th year app (75%) | $43.39 | $22.68 | $66.07 | $75.75 | $75.75 |
| 3rd year app (65%) | $37.60 | $19.20 | $56.80 | $65.12 | $65.12 |
| 2nd year app (55%) | $31.82 | $16.05 | $47.87 | $54.89 | $54.89 |
| Foreman (JW + 15%) | $66.53 | $28.42 | $94.95 | $108.87 | $108.87 |
| Crew blend (1F/3J/1A4/1A2) | — | — | $74.74 avg | $85.69 avg | $85.69/hr |
The labor burden multiplier shown (1.22x) reflects FICA 7.65% + FUTA/SUTA ~1.2% + workers' comp 6-9% for electrical + general liability 0.6-1.0% + fringe-delivery adjustment. This is only applied to the base wage when fringe is paid to bona fide plans; if any portion is paid in cash, that cash portion also gets the full 1.22x burden applied. That is the compliance math non-union shops most often get wrong.
Building a federal crew rate at your normal open-shop composite of 1 foreman + 1 journeyman + 4 helpers. On a DBA job, "helper" is almost never a recognized classification — unclassified labor defaults to the journeyman rate per 29 CFR 5.5(a)(1)(ii) and the conformance process at 29 CFR 5.5(a)(1)(v). Four helpers at helper rate become four journeymen at DOL review, and the retro-pay calculation lands on your fee line.
Truck drivers and the "integral to construction" question
DBA coverage of truck drivers is narrow but real. Per the 2023 DOL rule (29 CFR 5.2), a driver delivering materials from a commercial supplier to the site is generally not covered. A driver hauling materials from a dedicated batch plant or fabrication yard established for the project, or from the site to a dedicated disposal site, is covered. Site-to-site hauling by an onsite driver is covered. The WD includes truck driver classifications (Dump Truck, Lowboy, Truck Driver, etc.) — apply them to the covered haul segments only.
A $64/hr loaded truck driver rate on 1,200 hours of onsite hauling that was priced at a $38/hr commercial driver rate is $31,200 of uncovered exposure.
WH-347 certified payroll
Federal contractors and every tier of subcontractor must submit a WH-347 (or equivalent) certified payroll report weekly, signed under penalty of perjury (29 CFR 3.3). The form captures per-employee: classification, hours per day, total hours, rate of pay, fringe payment method, gross wages, deductions, and net. The "Statement of Compliance" on the back page is the legal document.
Certified payroll is submitted to the contracting officer, and on many DOL programs it is also submitted to the system of record (e.g., LCPtracker, eMars, or DOL's PIMS). Misclassifications, missed fringe, or apprentice-ratio violations surface here. Non-compliance findings trigger withholding of progress payments under FAR 52.222-7, and serious violations can trigger debarment (29 CFR 5.12).
State prevailing wage when DBA does not apply
When a project is not federally funded, DBA does not apply — but many states have "little Davis-Bacon" statutes. California (Labor Code §1720 et seq., DIR-administered), New York (Labor Law §220), Illinois (820 ILCS 130), Washington, Massachusetts, Minnesota, New Jersey, and roughly twenty-three others publish their own prevailing wage rates. On a California state-funded public-works project over $1,000 (Labor Code §1771), state PW applies even without federal money.
State rates and the federal WD on the same project can differ — sometimes by 8-15%. On a mixed-funded project, the higher of the two applies per class per task. A competent bid cross-references both the federal WD and the state DIR rate sheet, then uses the higher rate for each classification.
"I have watched four good contractors walk away from federal work because they lost the first job. Every time, the post-mortem came back to the same place: they built the crew rate at the open-shop blend, did not deliver fringe through plans, and did not understand the apprentice ratio. The WD was not the problem. The buildup was."
Darnell Fisher, Principal, Federal Projects — reflecting on fifteen years of DBA post-mortems
Bid discipline for federal work
A disciplined federal bid builds every crew rate from the WD base, classifies every hour by WD classification, applies the correct labor burden for cash vs. plan fringe delivery, honors the apprentice ratio of the registered program, and carries a separate line for covered truck-driver hours. Certified payroll is priced into overhead as a function of labor hours, not as a flat percentage. State PW is overlaid on mixed-funded jobs and the higher rate wins. When the project closes out, the WH-347 record matches the bid buildup, and there is no retroactive-pay finding waiting at final inspection.