The fastest way to bankrupt a construction company is to estimate labor based purely on the hourly wage. The "base wage" is only a fraction of the cost. Labor Burden is the total cost of keeping an employee on the payroll, and if it's not explicitly calculated in your estimating software, you are subsidizing the GC's project out of your own profit.
The Components of Labor Burden
A professional estimate breaks down labor costs into three distinct categories: Base Wage, Statutory Costs (Taxes), and Overhead/Fringe Benefits.
- Statutory Costs: FICA (Social Security & Medicare, 7.65%), FUTA (Federal Unemployment), SUTA (State Unemployment), and Workers' Compensation Insurance (which can range from 5% to 25% depending on the trade's risk classification).
- Fringe Benefits: Health insurance, 401(k) matching, union annuities, and paid time off (PTO).
- Indirect Labor Costs: Small tools allowance, PPE, vehicle stipends, and training hours.
Missed: Non-Productive Time (NPT)
Estimators often assume a worker is productive for 8 hours a day. They forget the morning gang box meeting, the walk to the 14th floor, the bathroom breaks, the material fetching, and cleanup. A carpenter paid for 8 hours is usually only installing drywall for 6.5 hours.
When calculating the 'Effective Hourly Rate', we divide the total burdened cost by the actual productive hours (usually around 1,800 hours/year), not the standard 2,080 hours.
Prevailing Wage and Davis-Bacon
Public works projects introduce massive complexity. Prevailing wage laws require contractors to pay a specific base rate plus a mandatory "fringe" rate. If your company does not provide health insurance equal to the fringe amount, you must pay the difference in cash on the worker's check. Estimators must use completely separate labor databases when bidding public vs. private work.
How to Calculate Your Effective Rate
Formula: (Total Annual Salary + Total Annual Burden) / Productive Hours = Effective Hourly Rate
If you pay a worker $30/hour ($62,400/year), their burden (taxes, comp, insurance, tools) might be $25,000. Total cost: $87,400. If they only have 1,800 productive hours, your Effective Bidding Rate is $48.55/hour. If you bid them at $30, you lose $18.55 for every hour they work.