Most first-year concrete contractors don’t go broke because their work is bad. They go broke because they priced good work like a laborer instead of a business. If you just went out on your own, this is the estimating foundation to build before habit builds it wrong for you.
Estimating is three numbers, not one
Every concrete estimate is the sum of three separate calculations: direct costs, overhead, and profit. New contractors reliably get the first one roughly right, forget the second entirely, and treat the third as whatever’s left. That ordering is backwards. Profit is a line item you decide, not a residue you hope for.
Direct costs: take off quantities, then price them
Start with the quantity takeoff. For slab work, volume in cubic yards is length times width times thickness (in feet) divided by 27, then add 5 to 10 percent waste. Count everything else the same way: base rock by the ton, rebar by the stick or mesh by the sheet, form lumber, expansion joint, sealer, dowels at cold joints. Write the list down every time. The items you price from memory are the items you forget, and forgotten items are pure margin loss.
Labor is where new estimators get hurt. The number that goes in the estimate is loaded labor cost: wage plus payroll taxes, workers comp, and insurance, which typically lands 25 to 40 percent above the paycheck number. If you pay a finisher $28 an hour, the estimate carries $35 to $39. Estimate hours by phase, grade, form, steel, pour, finish, strip, cut, because phases are checkable against reality afterward. A single blended “labor” guess never is.
Overhead: the invisible cost that sinks year one
Your truck, insurance, fuel, phone, tools, license, bookkeeping, and every unpaid hour you spend quoting and invoicing are real costs of every job, even though no customer sees them. Total them monthly, divide by the jobs or billable hours you realistically do in a month, and that allocation goes into every estimate. A contractor billing $50,000 of work through a business that costs $4,000 a month to exist needs roughly 8 percent of every estimate just to break even on existence, before wages and before profit.
Profit: decide it, then defend it
On residential concrete, established contractors typically target a gross margin between 20 and 35 percent. Pick your number deliberately and put it in the estimate as a line you can see. Then, and this is the habit that separates businesses that last, compare the estimate to actuals when the job closes. Which phase ran over? Was the yardage right? Did the pump eat the margin? Estimating skill is not a talent, it’s a feedback loop, and it only runs if you keep score.
The underbid trap
The first year comes with pressure to win work by being cheapest, and losing a bid feels like failure. Here’s the reframe: losing a bid costs you nothing, winning an underpriced bid costs you money, wear, and a customer who now believes that’s your price. Some jobs should be lost. When a competitor’s number is 30 percent under yours, they either missed something, carry no insurance, or are eating their own savings. None of those is a pricing strategy worth copying.
Build the system before you need it
Every rule above is easier with structure: a written cost catalog with your current supplier prices, labor phases with your real crew rates, overhead allocated automatically, margin visible before the bid goes out, and bid-versus-actual tracked without a spreadsheet evening. That’s the system we’re building with Punchlist for independent contractors and small crews, estimate from your phone, at a price that pays you like a business. Join the waitlist to get it when it ships.