Civil Contractor Prevailing Wage Bid Overhead

TL;DR: Civil contractors doing both DOT or municipal prevailing wage work and private work need two overhead rates — one for each work type. Prevailing wage work requires fringe benefit payments on top of base wages ($12–$20/hour on federal work for operators and laborers) that do not apply to private work. A contractor using a blended overhead rate underprices prevailing wage work by the fringe benefit difference on every public bid. SPM calculates separate overhead rates for prevailing wage and private work at engagement start for every civil client.

The Problem

What You Are Dealing With

Fringe Benefits Inflate Labor Cost on PW Work

A heavy equipment operator at $38/hour base wage on federal prevailing wage work requires $14–$18/hour in fringe benefits on top — health insurance, pension, and training fund contributions mandated by the wage determination. Your private work overhead rate was calculated using $38/hour as the labor cost base. On prevailing wage work, the real cost is $52–$56/hour. The overhead rate in your bid does not reflect that.

Classification Errors Create Back Wage Liability

Civil prevailing wage work uses operator, laborer, and carpenter classifications at different rates. Using a laborer rate for an operator, or failing to pay the correct fringe for each classification, creates back wage liability equal to the underpayment. Civil contractors with large DOT projects have received six-figure back wage assessments from classification errors that went undetected for months.

One Overhead Rate Applied to Both Work Types

A contractor bidding a $2M private site development job and a $2M DOT highway project with the same overhead rate is pricing one incorrectly. Prevailing wage work has higher labor burden — so the overhead rate that correctly covers private work overhead understates what is needed to cover the same overhead on prevailing wage work at the higher labor cost base.

The Fix

How to Fix It

Calculate Two Overhead Rates — PW and Private

Private work overhead rate: SG&A divided by private work revenue. Prevailing wage overhead rate: SG&A divided by prevailing wage revenue, calculated on the prevailing wage labor cost base including fringe. The difference between the two rates reflects the additional overhead burden per dollar of prevailing wage labor. Both go into the bid model — applied to the correct work type on every bid.

Pull the Current Wage Determination Before Every PW Bid

Prevailing wage rates change. Federal Davis-Bacon rates are updated periodically. State DOT prevailing wages update on their own schedules. Bidding with a rate that was current 18 months ago and has since increased means the labor cost in the bid is wrong. Pull the current determination from SAM.gov for federal work or the applicable state agency for state work before every prevailing wage bid.

Build Certified Payroll Into the Weekly Process

Certified payroll for civil work is submitted weekly. Each submission certifies that every worker was paid the correct prevailing rate for their classification. SPM builds the classification structure in ControlQore so certified payroll is generated from actual time entry data — not manually assembled. The weekly submission takes 15–20 minutes to review and file rather than 2–3 hours of manual assembly.

Track PW and Private Job Costs Separately in ControlQore

Prevailing wage projects are tagged in ControlQore with the applicable wage determination. Cost reports separate PW and private work margins. After six months, the pattern shows whether PW work is as profitable as private work at the current pricing or whether the overhead rate gap has been silently compressing margins on public projects.

Client Outcome

Real Numbers — Real Results

Civil Contractor · $6.7M Revenue

This contractor did approximately 40% of revenue on DOT and municipal prevailing wage work. A single blended overhead rate was used in all bids. When SPM separated the overhead calculation by work type, the prevailing wage overhead rate was 4 points higher than the private work rate — meaning every DOT bid had been underpriced by 4 points for years.

LOC $348,000 → $0

In 60 days after SPM corrected the billing structure — including the prevailing wage overhead correction on new bids.

$65,000

In employee bonuses paid after the financial system was corrected.

FAQ

Frequently Asked Questions

Do civil contractors need separate overhead rates for prevailing wage work?

Yes. Prevailing wage work has higher labor burden — fringe benefit requirements that do not apply to private work. A civil contractor using one overhead rate for both types is either overpricing private work or underpricing public work. SPM calculates both at engagement start.

What fringe benefits are required on federal civil prevailing wage work?

Davis-Bacon fringe benefit requirements for civil trades in 2026 typically include contributions to health and welfare, pension, and apprenticeship training funds. Total fringe rates for heavy equipment operators on federal highway work typically run $14–$20/hour. The specific rate depends on the wage determination for the project's location and work type — pulled from SAM.gov before bidding.

How do I find the prevailing wage determination for a civil project?

For federal Davis-Bacon work: SAM.gov, under wage determinations. Search by state and county. For state-funded DOT work: the applicable state department of labor or transportation website. Determination numbers are typically listed in the bid documents. Always use the determination in effect on the date the contract is awarded — not the date you bid.

What happens if a civil contractor pays the wrong prevailing wage rate?

Back wage liability for the difference between what was paid and what was required, plus potential penalties. For Davis-Bacon work, the Department of Labor can assess back wages and debarment from future federal work. Most assessments result from classification errors (wrong trade classification for work performed) or fringe benefit underpayment. Both are preventable with correct classification tracking in ControlQore.

One Overhead Rate for All WorkIs Costing You on Every PW Bid.