General contractor estimating is one of the most complex skills in the construction industry. A GC estimate must integrate dozens of subcontractor scopes to MEP, structural, civil, architectural finishes, while accounting for general conditions, overhead, profit, and risk. Getting it right means winning bids at sustainable margins.
Structure of a GC Estimate
Direct Costs
Direct costs are the subcontractor bids, self-performed work, and material purchases that make up the construction scope. For a typical commercial project, direct costs represent 75-85% of the total bid price. Key direct cost categories include: site work and civil, concrete and masonry, structural steel, MEP, architectural finishes, and specialty systems.
General Conditions
General conditions cover the cost of managing the project: superintendent salary, project manager time, temporary facilities (trailers, toilets, dumpsters), site safety, insurance, bonds, permits, and testing. General conditions typically represent 8-15% of direct costs depending on project duration and complexity.
Overhead and Profit
GC overhead covers home office expenses not allocated to a specific project to accounting, marketing, equipment depreciation, and executive salaries. Profit is the return on risk and investment. Combined overhead and profit for commercial GCs typically ranges from 5-15% on top of direct costs and general conditions.
The Most Common GC Estimating Mistakes
- Scope gaps between subcontractors to the most costly mistake
- 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 systems are the single largest source of scope gaps in GC estimating. When mechanical, electrical, plumbing, and fire protection subcontractors each interpret scope differently, the GC ends up with unpriced items discovered during construction. A professional MEP estimate with clear scope inclusions and exclusions closes these gaps before bid day.
Strategies for More Competitive GC Bids
- 1Start sub scope sheets early to send them with the initial 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
- 5Conduct post-bid reviews to identify where you were high or low on each scope
- 6Develop preferred subcontractor relationships in each trade for better sub coverage
Frequently Asked Questions
How does Tech MEP Estimates help general contractors?
We provide GCs with professional MEP estimates that can be used to verify sub bids, fill missing scope items, and bid projects where MEP subs haven't 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 24-48 hours for most commercial projects. Rush delivery is available for last-minute bid opportunities.
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