General contractor estimating is one of the hardest skills in construction. A GC estimate pulls together dozens of subcontractor scopes. It must cover MEP, structural, civil, and architectural finishes without a single gap.
It also has to add general conditions, overhead, profit, and risk. Get it right, and you win bids at healthy margins. Get it wrong, and you either lose the job or lose money.
Structure of a GC Estimate
Every GC estimate has three layers. Direct costs, general conditions, and overhead and profit stack up to the final price. Here is how each layer works.
Direct Costs
Direct costs are the heart of the bid. They cover subcontractor bids, self-performed work, and material purchases. On a typical commercial project, they make up 75% to 85% of the total price.
Key direct-cost categories include site work and civil, concrete and masonry, and structural steel. They also include MEP, architectural finishes, and specialty systems.
General Conditions
General conditions cover the cost of running the project. That means superintendent and project manager time, plus trailers, toilets, and dumpsters. It also includes safety, insurance, bonds, permits, and testing.
General conditions usually run 8% to 15% of direct costs. Longer and more complex projects push that share higher.
Overhead and Profit
GC overhead covers home-office costs not tied to one project. That includes accounting, marketing, equipment depreciation, and executive salaries. Profit is your return on risk and investment.
Combined overhead and profit usually runs 5% to 15%. You add it on top of direct costs and general conditions.
The Most Common GC Estimating Mistakes
A few mistakes sink GC bids again and again. Each one is avoidable with careful scope review. Watch for these before you submit.
- Scope gaps between subcontractors, the most costly mistake of all
- Missing temporary utilities (water, power, heat) during construction
- Underestimating general conditions duration if the schedule slips
- Not reviewing specifications for Division 01 GC-furnished items
- Accepting low sub bids without verifying full scope coverage
- Forgetting owner-furnished contractor-installed (OFCI) coordination costs
- Missing testing and special inspection costs required by the structural engineer
How MEP Scope Gaps Hurt GC Bids
MEP is the single largest source of scope gaps in GC estimating. Each trade can read the drawings differently. So the GC ends up with unpriced items during construction.
A professional MEP estimate lists clear inclusions and exclusions. That closes the gaps before bid day. It also protects your margin once the job starts.
Strategies for More Competitive GC Bids
You can win more bids without cutting your price. These strategies tighten your scope and speed up your process.
- 1Start sub scope sheets early and send them with the RFQ, so subs bid the same scope
- 2Use a professional MEP estimating firm to verify sub bids and fill gaps
- 3Maintain a database of actual project costs for parametric benchmarking
- 4Bid more projects per month by outsourcing MEP takeoffs
- 5Run post-bid reviews to see where you were high or low on each scope
- 6Build preferred subcontractor relationships in each trade for better coverage
How to Level Subcontractor Bids
Leveling sub bids is where GCs win or lose. Put every sub on the same scope before you compare price. That way you compare apples to apples.
- 1Send every sub the same detailed scope sheet with the RFQ
- 2Note each sub's inclusions and exclusions in one place
- 3Fill any gap no sub priced with your own estimate or an allowance
- 4Compare bids line by line, not just by the bottom-line number
- 5Confirm the low bid actually covers the full scope
Why Accurate GC Estimating Wins Work
Accurate estimating is a competitive edge, not just paperwork. A tight bid wins the job and still holds margin. A loose bid either loses the work or bleeds cash.
Contractors who estimate well bid more often and win more. They also protect their reputation with owners. That is why many GCs bring in outside estimating help during busy bid seasons.
Frequently Asked Questions
How does Tech MEP Estimates help general contractors?
We give GCs professional MEP estimates to verify sub bids and fill missing scope. You can even bid projects where MEP subs have not responded. Our GC package includes scope leveling notes, so you can compare sub bids side by side.
How fast can you deliver a GC-focused MEP estimate?
Standard turnaround is 24 to 48 hours for most commercial projects. Rush delivery is available for last-minute bid opportunities.
What is the difference between direct costs and general conditions?
Direct costs build the project, like concrete, steel, and MEP. General conditions run the project, like supervision, safety, and temporary facilities. Both belong in a complete GC bid.
Structural and architectural scope are common sources of GC bid gaps. See our structural estimating guide and architectural estimating guide for full trade breakdowns.
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