Congratulations, You're the Low Bidder. Now Find Out Why.

Every contractor knows the call. The bids have been opened, yours is the lowest, and somebody is already saying congratulations.

The most experienced person in the room asks a different question: How far below second place were we?

A Small Masterpiece of Assumptions

Our family has been blessed with the opportunity to bid on a substantial commercial construction project, and I've had a lot of fun helping put the proposal together.

I've spent years around the contracting business, but there's something fascinating about sitting down and working through the actual numbers. Labor, equipment, subcontractors, materials, scheduling. You're trying to put a price on work that hasn't happened yet, with about a hundred things that could change between now and the day it's finished.

Take the lift. Pricing a rental is easy. Knowing how long you'll actually need it is another matter, because that depends on crew size, sequencing, the other trades on site, and everything that might slow the work down. Underestimate the rental period and the extra days eat into your margin. Overestimate it and your bid gets less competitive.

Then there's the electrical work, which needs a separate proposal from a licensed electrician. That price is only as good as everyone's shared understanding of where their scope ends and yours begins.

The expensive items tend to be the ones each side assumes the other is carrying.

Watching all this, I wrote down a line I keep coming back to: A good construction bid is a small masterpiece of assumptions, math, and experience.

The math is the part anyone can check. The assumptions are where the money is.

A $301,769 Line That Never Made the Total

In 1951, the M.F. Kemper Construction Company bid on public construction work for the City of Los Angeles. Its number came in at $780,305. The next-lowest bid was $1,049,592.

That's a gap of more than $269,000, and it had a simple explanation. One item worth $301,769 had been estimated on a worksheet and then left off the final sheet where everything got added up. A later California court opinion, describing the case, noted that the men preparing the bid were exhausted after long hours under pressure.

Kemper caught the error within hours and asked to withdraw. Under the circumstances of that case, the courts allowed the company to withdraw its bid without forfeiting its bid bond.

Most bad bids aren't that dramatic, and that's what makes them dangerous. A missing line on a summary sheet can be found and proven. A wrong assumption about how long the work will take just looks like a competitive price.

The Economists' Surprise

Economists have a name for the risk hiding in that congratulatory phone call. They call it the winner's curse. When several companies estimate the cost of the same job, the one that wins a lowest-price contest may be the one that underestimated it the most.

That doesn't make the low bidder wrong by default. A contractor might have a more productive crew, lower overhead, a better supplier relationship, or equipment already sitting in the yard.

The useful question is whether you're cheaper because you're better or because you missed something.

In 1996, economists Douglas Dyer and John Kagel published research examining the winner's curse in construction bidding. Their work explored an interesting contrast: experienced construction executives could fall prey to the winner's curse in laboratory experiments, even though their real-world bidding experience gave them ways to evaluate opportunities that the experiments couldn't fully reproduce.

The researchers pointed to learned, industry-specific judgment and factors such as a company's existing workload.

In plain terms, a lot of the skill lives outside the spreadsheet: knowing which jobs to bid, what's missing from the drawings, how a full calendar changes your price, and when to walk away.

The same instinct matters in residential work. An HVAC replacement quote that comes in thousands below the competition might reflect a genuine advantage. Or it might mean someone missed a line item, underestimated installation hours, or priced the equipment incorrectly.

A bid, in the end, is a prediction with your signature on it.

The Question AI Raises

AI is already changing construction estimating. Takeoff software can measure drawings, count materials, and eliminate hours of tedious work. For contractors who spend evenings and weekends preparing bids they may never win, that's a welcome development.

I'm curious, though, about what happens to competitive bidding as these tools become more widely adopted. If contractors can prepare estimates in a fraction of the time, they can pursue more projects. And if more companies are bidding on the same work, the pressure to come in low doesn't exactly disappear.

There's an interesting possibility here: Technology could make estimating more efficient while making the judgment behind each bid even more consequential.

I suspect experienced estimators will welcome the technology. They know better than anyone how much time goes into the process, and how expensive a bad assumption can become. But I also suspect they'll be the first to tell you that a faster takeoff doesn't necessarily produce a more profitable job.

That's what I've appreciated most about getting involved in this project. A construction bid represents an enormous amount of thinking about things that haven't happened yet. The crew hasn't arrived. The equipment hasn't been delivered. The inevitable surprises haven't shown up.

And yet somebody has to put a price on all of it.

I hope we win our bid. But after seeing what goes into preparing one, I have a much greater appreciation for what it takes to win the right way.