Construction Overhead Calculator

Construction overhead includes all business costs not directly tied to a specific project: office rent, insurance, vehicles, staff salaries, marketing, utilities, accounting, and equipment maintenance. Overhead is the cost of being in business. Profit is the return on risk and investment above overhead. In contractor pricing: Bid Price = Direct Costs + Overhead + Profit. Overhead is typically 10-20% of direct costs; profit margin targets 5-15% of bid price.

Overhead rate = Total annual overhead / Total annual direct costs x 100. For example, if annual overhead is $200,000 and annual direct job costs are $1,000,000, the overhead rate is 20%. To recover overhead, add 20% to each job's direct cost. Industry overhead rates: general contractors average 15-25% of direct costs; specialty subcontractors average 10-20%. Overhead rates should be reviewed annually.

Markup is applied to cost: Selling price = Cost x (1 + Markup%). Margin is a percentage of the selling price: Margin% = Profit / Selling price x 100. A 25% markup results in a 20% margin. To convert markup to margin: Margin = Markup / (1 + Markup). To convert margin to markup: Markup = Margin / (1 - Margin). Contractors sometimes confuse the two, which leads to pricing errors and losses.

Required insurance types: General Liability (usually $1-2M per occurrence), Workers Compensation (required in all states for employees), Commercial Auto, Contractor's Equipment and Tools, Builder's Risk (for projects under construction), Professional Liability/E&O (for design-build contractors), and Umbrella Liability. Insurance premiums are a significant overhead cost, typically 3-8% of direct labor and revenue depending on trades and claims history.

Break-even volume = Total annual fixed overhead / (Gross margin per dollar of revenue). For a contractor with $200,000 annual fixed overhead and a 20% gross margin on revenue: Break-even = $200,000 / 0.20 = $1,000,000 in revenue per year. Volume below this results in a net loss; volume above generates profit. Break-even analysis is essential for annual budgeting and minimum bid pricing.