Every commercial concrete job starts with a number. That number determines whether the work is profitable, whether it's competitive, and whether the business that produced it can sustain itself through the next bid cycle and the one after that. Getting that number right is the core skill in commercial concrete subcontracting. And it's one that most contractors learn, slowly and expensively, on live jobs rather than in any structured way.

Joseph Toppi spent 20 years in commercial construction before launching Stancon Consultants, including building a concrete operation to 46 employees and reaching a 54% gross profit margin. The financial discipline that produced those results started in the estimating process, specifically in understanding what concrete estimating actually involves, what it costs to get wrong, and how to build a process that produces reliable numbers rather than hopeful ones.

This article covers the concrete estimating process from the ground up: what each step involves, where the most common and most expensive mistakes happen, and where to go deeper on each component as your operation grows. If you're newer to commercial concrete estimating, this is the starting point. If you've been doing it for years, the deeper articles linked throughout will sharpen the specific areas where most established subs are still leaving money on the table.

Our concrete estimating services at Stancon Consultants are built around this same process, applied specifically to commercial concrete scopes.

Step 1: Qualify the Opportunity Before You Open the Drawings

This is the step most concrete subcontractors skip entirely, and it's the one that wastes the most time and resources over the course of a year.

Not every invitation to bid deserves a full estimate. Every estimate costs real money in time, labor hours, and the opportunity cost of not spending that capacity on a better opportunity. Performing a takeoff on a project you have a low probability of winning because the GC relationship is weak, the scope is outside your strongest capabilities, or the contract terms carry unusual risk is one of the most common and most avoidable ways concrete subs dilute their estimating effectiveness.

Before any drawing set goes to your estimating team, run a quick bid/no-bid assessment. Is this project type within your strongest concrete scope? Is this a GC you have a real relationship with, or are you filling their spread? Does the bid window give you enough time to produce a number you'd actually stand behind? Can you execute this project given your current backlog and crew availability?

The answers don't need to be formal. They need to be honest. A concrete bid strategy built on disciplined qualification consistently produces higher win rates than one built on maximum bid volume.

Step 2: Read Every Document Before You Measure Anything

This is where most concrete estimating errors originate, not in the math, but in the reading.

Commercial concrete projects generate a substantial set of bid documents: architectural drawings, structural drawings, civil drawings, geotechnical reports, specifications across multiple divisions, bid forms, addenda, and often pre-bid meeting notes. Each of these contains information that affects your scope, your cost, or your risk. Missing a specification requirement, pricing off a superseded drawing set, or failing to incorporate an addendum that changed the slab thickness by two inches: these aren't calculation errors. They're document management failures, and one of the most preventable yet costly estimating mistakes is performing a takeoff from an outdated set of drawings.

Before starting the takeoff, establish which drawing set is current, confirm you have all addenda, pull the Division 03 specification section and read it in full, and identify the bid form so you know exactly how the GC expects your submission to be organized. That upfront discipline takes an hour. Discovering mid-estimate that you've been pricing the wrong slab spec costs far more.

Step 3: Perform a Thorough Quantity Takeoff

The takeoff is the foundation of everything that follows. It's where you measure and quantify every scope item from the drawings: cubic yards of concrete by pour and location, linear footage of formwork by system type, square footage of slab on grade vs. elevated deck, rebar tonnage by bar size, and any other measurable scope item that appears in the documents.

Understanding the distinction between a takeoff and an estimate is fundamental to this step. A takeoff tells you what the project requires. An estimate tells you what it costs. One feeds the other. An estimate built without a thorough takeoff is a guess with a professional format, and neglecting to include accurate quantities can underbid labor costs by 20 to 30% or more.

For commercial concrete specifically, the takeoff complexity varies significantly by scope type. A straightforward slab-on-grade package is relatively linear to quantify: area, thickness, reinforcement, and edge conditions. A cast-in-place structural package with multiple pour locations, varying footing depths, and complex rebar details requires a fundamentally different level of takeoff discipline. Understanding how structural concrete estimating differs from flatwork before you start the takeoff is what prevents you from applying flatwork assumptions to a scope that requires a different approach.

A few practical rules that protect takeoff accuracy:

• Every scope item in the price must be in the takeoff

• Every item in the takeoff must be traceable to a specific drawing reference

• Add a concrete waste factor of 5 to 10% to account for overages, pump line priming, and pour losses

• Verify quantities on high-value line items with a second check before moving to pricing

Step 4: Price Materials, Labor, and Equipment From Current Data

This is where the takeoff quantities get converted into dollars, and where using stale data produces bids that looked competitive when you built them and lose money when you execute them.

Materials. Get current quotes from your ready-mix supplier and rebar fabricator before pricing, not from a database that was last updated six months ago. Prices for concrete and steel shift monthly, sometimes weekly, driven by fuel rates and regional demand. A two-month-old material price on a large pour can represent thousands of dollars in unrecovered cost by the time the truck rolls.

Labor. Labor is consistently the most underestimated cost in concrete estimating. The number to build from is not the hourly wage you pay your crew. It's the fully loaded labor cost: base wage plus payroll taxes, workers' compensation, benefits, and any other employer contributions. Neglecting to include labor burden can underbid labor costs by 20 to 30% or more. Beyond burden, labor productivity assumptions need to reflect the actual scope. Flatwork finishing productivity is different from structural forming productivity, which is different again from elevated deck work.

Equipment. Any equipment rented specifically for the project is a direct cost that belongs in the estimate: pump trucks, concrete buggies, screeds, ride-on trowels, and any specialty forming equipment. Owned equipment costs are handled differently, as part of your overhead structure, which is covered in the next step.

Step 5: Add Overhead and Calculate Your Markup Correctly

This is the step where the gap between a concrete subcontractor who understands their numbers and one who doesn't becomes most visible.

Overhead is every cost that runs your business independent of any specific project: office rent, insurance, administrative salaries, vehicles, software, and estimating time itself. These costs don't appear on a job-specific invoice, which makes them easy to undercount or approximate. But they're real, they're constant, and every bid you submit needs to recover them. Many contractors focus so heavily on direct job costs that they forget to account for business expenses like insurance, utilities, and office staff. Without a proper markup, you may win the job but lose money doing it.

The starting point is knowing your actual overhead rate, not an approximation, not what someone told you was industry standard. The full breakdown of how to calculate that rate, what expense categories belong in the overhead pool, and how to apply it correctly to individual bids is covered in detail in the overhead costs guide for concrete subcontractors.

Once overhead is correctly accounted for, the markup calculation has to be done right. This is where understanding the difference between markup and margin directly affects every bid you produce. A 20% markup on direct costs produces a 16.7% gross margin on revenue, not 20%. If your overhead rate is 18% of direct costs, that 16.7% gross margin is almost entirely consumed by overhead before a dollar of profit is counted. Knowing this before you set your markup is the difference between pricing for the margin you want and discovering months later that the margin wasn't there.

Step 6: Write a Proposal That Protects You as Much as It Sells You

The number is not the bid. The proposal is the bid.

A GC reviewing a concrete bid spread is evaluating your proposal document as much as your price. They're looking at scope clarity, exclusion language, and whether they can level your submission against the other subs without needing a follow-up call. A proposal with gaps, vague assumptions, or missing exclusions creates risk the GC has to manage, and risk in a bid spread gets priced in against you even when your number is competitive.

A complete concrete bid proposal includes a scope of work anchored to the project documents, scope clarifications documenting the assumptions your price is built on, project clarifications defining GC responsibilities, and project notes addressing every scope item that was excluded and why. The full breakdown of what a professional concrete bid proposal includes, with real proposal examples, covers the standard that wins work at prices that aren't always the lowest in the spread.

Step 7: Track Actuals Against Estimates After Every Job

This is the step that separates concrete subcontractors who get better over time from those who repeat the same estimating patterns year after year without knowing whether they're working.

After every completed project, compare your estimated quantities, labor hours, material costs, and overhead recovery against what the job actually cost. Where did you overestimate? Where did you underestimate? Were your labor productivity assumptions accurate for that scope type? Did the overhead recovery match what the business spent during the project?

That comparison builds a cost history specific to your operation, your crew, your market, and your project types. Over time, that history is the most valuable estimating tool you have, more reliable than any database and more relevant than any industry benchmark, because it reflects how your business actually performs rather than how the industry averages perform.

When Your Estimating Process Needs Support

The process above is straightforward in principle. Executing it consistently on every bid, at the quality level commercial concrete work requires, while also managing active projects, GC relationships, crew scheduling, and everything else a concrete sub is carrying, is where most operations run into capacity problems.

Inaccurate takeoffs and inadequate estimating processes cost contractors an estimated $273 billion annually across the construction industry. Most of that cost doesn't come from a single catastrophic error. It comes from consistent small underestimates that compound across dozens of jobs: labor burden slightly understated, overhead slightly under-recovered, scope items occasionally missed under deadline pressure.

Whether you need per-project support on a complex scope, an ongoing fractional estimating arrangement that gives you professional-grade preconstruction capacity without a full-time hire, or help evaluating what the right estimating infrastructure looks like for where your business is right now, the guide to choosing the right estimating service is where to start.

At Stancon Consultants, we work exclusively with commercial concrete subcontractors. Every estimate we produce is built on your actual cost structure, not generic assumptions, and delivered with documentation you can open, review, and defend. If you want to see what that looks like before committing to anything, let's start with a conversation.