Most contractors lose money not because they do bad work, but because they price it wrong. The confusion between markup and margin alone costs the industry billions in underpriced bids every year. If you think a 20 percent markup gives you a 20 percent profit margin, you are wrong, and you are not alone. This guide breaks down overhead, profit, markup, and margin with real numbers, real formulas, and real benchmarks from CFMA, NAHB, and Turner and Townsend. No theory. Just the math that keeps your doors open.
Markup Is Not Margin, and the Difference Will Cost You
Here is the thing that trips up even experienced contractors: markup and margin are not the same number, and the gap between them grows as the percentages increase. A 20 percent markup on a $100,000 job means you charge $120,000 and keep $20,000. But your profit margin on that job is only 16.67 percent, because margin is calculated from the selling price, not the cost. If you promised a client "we work on a 20 percent margin" but you are actually applying a 20 percent markup, you are earning 3.33 percentage points less than you think. On a $5 million project, that is $166,500 you thought you were making but are not.
According to CFMA's 2024 Financial Benchmarker, top performing contractors earn approximately 12 percent net income before tax. But that is the top performers. The Turner and Townsend 2024 Global Construction Survey puts the US contractor average at just 3.5 to 7 percent net, depending on location and market conditions. At 5 percent net margins, a single mispriced job can wipe out an entire quarter of profit.
The math is simple but the consequences are severe. If you want a 20 percent margin on a job that costs $400,000, you need to charge $500,000 (a 25 percent markup). If you mistakenly apply a 20 percent markup instead, you charge $480,000 and your margin is only 16.67 percent. That $20,000 difference does not sound like much until you realize it happens on every single job. Over $10 million in annual revenue, the same mistake costs you $400,000 per year. According to Turner and Townsend, that is nearly all of your profit if you are an average contractor.
The 10 and 10 Rule: A Starting Point, Not a Strategy
The National Association of Home Builders reports what the industry calls the "10 and 10 rule": 10 percent for overhead and 10 percent for profit, giving a total markup of roughly 20 percent. This has been the baseline rule of thumb in construction for decades, and it works as a starting point. But it is just that, a starting point.
The reality is that overhead varies enormously by company size, trade, region, and business model. A GC running a 5,000 square foot office with two project managers and a fleet of trucks has very different overhead than a framing sub working out of his garage. You need to calculate your actual overhead rate, not use someone else's average.
Your overhead includes everything that keeps the business running when you don't have a hammer in your hand: office rent or mortgage, office staff salaries and benefits, vehicle payments and fuel, insurance premiums (general liability, workers comp, auto, umbrella), accounting and legal fees, marketing costs, software subscriptions, licensing and continuing education, phone and internet, and tools and equipment depreciation.
Add all of that up for the year. Divide by your total annual revenue. That is your actual overhead rate. If it is 15 percent and you are applying a 10 percent overhead markup, you are losing 5 percent on every job before you even talk about profit. According to the NAHB 2025 study, average net profit for single family home builders is 9 percent. But that average includes builders who calculated their real overhead and priced accordingly. Builders who guess at overhead and underprice their work make up the bottom of that distribution.
Where Overhead Dollars Actually Go
According to FMI Corporation, the US construction industry loses $177 billion annually to rework, data searching, and communication breakdowns. A significant portion of that waste lives in overhead costs that contractors don't track well: the estimator who spends 25 hours on a takeoff that could take 8 with the right tools, the PM who burns half of Friday fixing a billing error that cascaded from a bad spreadsheet formula, the office manager who manually compiles sub pay apps because there is no system to collect them digitally.
Here is a real scenario. Your estimator costs you roughly $85,000 per year in salary and benefits. According to Profound Estimates' 2025 research, manual takeoffs average 25 hours per project. If your estimator handles 100 bids per year, that is 2,500 hours on takeoff alone, basically their entire work year. Dan Cumberland Labs' 2025 data shows AI takeoff tools can complete a full architectural takeoff in 12 minutes. Even accounting for review time, you are looking at cutting takeoff time by 50 to 70 percent. That is not just faster estimating. That is your estimator handling twice the bid volume, or handling the same volume while doing more accurate work on each one. Either way, the overhead cost per bid drops dramatically.
The billing side of overhead is equally wasteful. According to BuildSync's 2025 survey of 200+ construction professionals, 30 to 40 percent of submittals are rejected on first pass, costing approximately $805 per rejection. Average days sales outstanding in construction is 90 days versus 30 days in other industries. Every day your money sits in someone else's pocket is a day you are financing their project with your working capital. Faster, more accurate billing means faster payment, which means less overhead spent on credit lines and bridge financing.
According to the AGC and NCCER 2025 Workforce Survey, 92 percent of construction firms report difficulty finding workers. When you can't find enough field labor, you compensate with overtime, which increases labor burden and overhead. When you can't find enough estimators, you compensate by bidding fewer jobs or rushing bids, which increases error rates. The labor shortage does not just affect the field. It ripples through your entire overhead structure.