The Electrical Estimating Mistake That Cost Me Everything

Rushing an electrical estimate without verifying labor and material costs is one of the most common—and costly—mistakes a contractor can make. Underbidding a job means every missed dollar comes directly out of your profit margin, not the client’s pocket. The fix: break estimates into smaller components, double-check your numbers, and use a reliable system before bid day.

I lost real money on a job early in my career. Not a rounding error. Not a small miscalculation I could absorb.

A genuine financial hit that came straight out of my pocket. And I’ve thought about it for 50 years.

That’s the kind of lesson that sticks.

What Went Wrong on That First Big Mistake

I underbid the job. Plain and simple. I didn’t account for all the labor.

I missed materials. I rushed through the estimate because I was eager to win the bid, and I let confidence override careful attention to detail.

There was no one else to blame. I moved too fast, didn’t double-check my numbers, and paid the price for it.

Here’s what made it worse: I didn’t even realize the full extent of the mistake until I was already on the job. By then, it was too late. You can’t go back to a client and renegotiate after you’ve signed the contract.

Why Estimating Mistakes Hit Your Bottom Line Directly

Every dollar you miss in an electrical estimate comes out of your profit margin—not overhead, not contingency. Your profit.

That realization changed everything for me. I had been treating estimating like a formality, something you did to get to the work. That first loss taught me it was the work.

Getting the estimate right is the whole game. You can run a flawless installation and still lose money if the numbers going in were wrong.

Winning the bid only matters if you win it profitably. That’s a lesson I cover extensively in my book, Everybody Has A First: “Lessons from a Lifetime in Electrical Contracting and Business” — because it’s one of the truths that took me years and real dollars to fully understand.

How That Loss Changed the Way I Estimate

After that job, I started tracking everything. Every line item. Every labor hour.

Every spool of wire. I reviewed completed jobs to find exactly where I was losing money, and I started breaking estimates down into smaller, verifiable components instead of working from rough mental totals.

That discipline is exactly why I eventually built Best Bid Electrical Estimating Software. I wanted a system that would catch the kinds of calculation errors that cost me that job—something organized, accurate, and built by an electrical contractor who had actually sat through bid day and felt the sting of getting it wrong.

Key Lessons for Every Electrical Estimator

If you take nothing else from this, take these four things:

• Never rush an estimate. The eagerness to win a bid is understandable. Letting that eagerness override accuracy is how you lose money.

• Break your estimate into components. A single lump-sum guess is not an estimate. Verify labor and materials at every phase.

• Use software that keeps you organized. Electrical estimating software like Best Bid exists to catch the errors your eyes miss after hours of working through a bid.

• Review every finished job. The numbers you track after the job are the education you use on the next one.

That Mistake Made Me a Better Estimator

I’m not grateful it happened, but I’m glad I paid attention when it did. That one job gave me a discipline I’ve carried for over 50 years. It taught me that estimating is a skill—one you build deliberately, with systems, with humility, and with a commitment to getting the numbers right before bid day, not after.

Your estimating mistakes don’t have to be expensive. They just have to teach you something.