10 Construction Bidding Mistakes That Cost GCs Millions
Most lost margin doesn't come from the field. It comes from the bid. Here are the mistakes that show up over and over in commercial estimating — and how to avoid them.
Bidding work outside your sweet spot
Chasing project types, sizes, or geographies you don't have a track record in. You'll either lose or win at the wrong price.
Skipping the spec book
Plans tell you what to build; specs tell you how — and at what risk. The supplementary conditions are where the LDs live.
Insufficient sub coverage
Bidding with only 1 or 2 sub quotes per trade. Either you're getting gamed or your number is wrong.
Misjudging schedule risk
Tight schedules cost real money — overtime, premium-time subs, expediting. Price the schedule, don't assume.
Flat-rate markup across all projects
Different projects have different risk. Same markup means you're overpriced on safe work and underpriced on risky work.
Not understanding the owner
First-time owner? Litigious developer? Reputation matters — price it.
Late RFIs
If you didn't ask the question during the RFI period, you own the assumption.
No internal bid review
Senior eyes on every bid over a threshold. Catches more errors than any other practice.
Ignoring win/loss patterns
If you're losing every bid by 5%, your overhead is high or your fee is high. If you're winning every bid by 20%, you're leaving money on the table.
Treating estimating as a cost center
Estimating is sales. Underinvest and the whole pipeline suffers.
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Frequently asked questions
What's the most common bidding mistake?
Bidding work outside your sweet spot — project types, sizes, or geographies you don't have a track record in. You'll either lose or win at the wrong price.
How many sub quotes do I really need?
3–5 per trade. With only 1–2, either you're getting gamed or your number is wrong.
Why is flat-rate markup a mistake?
Different projects have different risk. Same markup means you're overpriced on safe work and underpriced on risky work — losing both ways.
How do I avoid late RFIs?
Assign the spec book on day one of every bid. Read it in the first 48 hours and submit RFIs early — late RFIs rarely get answered before bid day.
Bottom line
Most bidding mistakes are systemic, not individual. Fix the system and the mistakes stop repeating.
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