I’ve worked for quite a few offsite factories over the years, and one thing that still amazes me is how differently each one handled estimating when a set of drawings came in from a builder or developer.
At one factory, the responsibility landed right on my desk. I’d go through the plans, build out the numbers, and own the quote. It wasn’t perfect, but at least there was some thought behind it.
At another, estimating lived in accounting. They had someone trained to run a software program that spit out numbers. The problem? The program was rarely updated. Material costs had changed, labor had shifted, and the numbers coming out looked precise—but they weren’t accurate. And that’s a dangerous combination.
But the one I’ll never forget… the one that still makes me shake my head… was the factory where the sales manager would take a quick look at the drawings, figure out the square footage, count the number of floors, windows, and doors—interior and exterior—and then give me a price.
Five minutes.
Off the top of his head.
No deep dive. No validation. No discussion. Just a number.
And here’s the part that should make every factory owner a little uncomfortable—that wasn’t unusual for its time. In some places, it still isn’t.
We wonder why profits disappear, why jobs go sideways, and why production gets blamed for things they can’t fix.
Sometimes, it all starts with a number that never had a chance of being right.
The Lie We Tell Ourselves
There’s a comforting lie in construction—and offsite is no exception—that once the job is sold, the rest is execution. Get it into design, get it onto the line, get it shipped.
But the truth is much harder to swallow.
If the estimate is flawed, everything that follows is just a slower, more expensive way of discovering that mistake. Profit doesn’t erode during the build—it was never there to begin with.
And yet, we keep pushing jobs forward, hoping experience, effort, or sheer willpower will make up the difference.
It won’t.
Estimating Is Not a Step—It’s the Whole Game
Too many companies still treat estimating like a phase instead of a discipline that touches every part of the business.
An estimate isn’t just a number—it’s a complete understanding of scope, labor, materials, sequencing, responsibility, and risk. When any one of those pieces is unclear, the number becomes fiction.
And fiction is a dangerous thing to build a factory schedule around.
The best companies don’t just “get bids out.” They build estimates slowly, methodically, and with input from design, production, and field experience. Everyone has a voice before the number is locked.
Because once it’s locked, it owns you.
Offsite Construction Gives You Fewer Chances to Recover
In site-built construction, mistakes can be fixed—painfully, expensively, but they can be fixed.
Offsite doesn’t offer that luxury.
Once a module or panel leaves the factory, your flexibility disappears. A missed dimension, an underestimated labor task, or an overlooked scope item doesn’t just cause a delay—it creates a chain reaction.
Design revisions turn into production slowdowns.
Production slowdowns turn into scheduling conflicts.
Scheduling conflicts turn into jobsite chaos.
And eventually, someone is paying for something nobody planned for.
The Silent Profit Killers
Estimating errors rarely show up as one big, obvious mistake. They creep in quietly.
A material price that hasn’t been updated.
A labor assumption based on “how we used to do it.”
A scope gap no one clearly owns.
Incomplete drawings that get “interpreted” instead of clarified.
A rushed bid to meet a deadline.
Individually, they don’t look like much.
Together, they create what the industry calls profit fade—the slow erosion of margin that turns a good job into a break-even one, or worse.
And by the time you recognize it, you’re already too far into the job to fix it.
Speed Is Costing You More Than Time
There’s constant pressure to move faster—get the quote out, win the job, keep the pipeline full.
But speed in estimating often creates a false sense of progress.
A fast estimate that’s wrong doesn’t help your business. It hurts it. It locks you into a commitment that your operations team now has to somehow “figure out.”
And they will try.
They’ll work harder. They’ll push longer. They’ll improvise.
But none of that creates margin. It only masks the problem until it shows up on the financials.
Preconstruction Is Where the Money Is Made
The companies that consistently perform well in offsite construction understand something that others resist:
Preconstruction is not overhead—it’s profit protection.
Time spent validating scope, aligning expectations, reviewing drawings, and stress-testing assumptions is not wasted time. It’s the most valuable work you’ll do on the project.
Because once the number is accepted, your opportunity to protect profit shrinks dramatically.
The job is no longer theoretical.
It’s real.
And real jobs don’t forgive bad assumptions.
Why This Problem Is Getting Worse
If estimating was easy ten years ago, it isn’t today.
Material pricing changes faster.
Labor is harder to predict and more expensive.
Transportation costs fluctuate.
Designs are more complex.
Schedules are tighter than ever.
All of these variables magnify even small estimating errors.
What used to be manageable is now amplified.
And in an offsite environment—where everything is interconnected—that amplification spreads quickly.
The Discipline Most Companies Skip
Here’s a simple question.
When was the last time your company did a true post-mortem on a completed job and compared the estimate to reality?
Not a quick review. A real one.
Where did we miss?
Why did we miss it?
What assumptions were wrong?
What needs to change next time?
Most companies don’t do this consistently.
And that means they’re not just losing money—they’re repeating the same mistakes over and over again, just on different projects.
Modcoach Observation
I’ve walked through enough factories and sat in enough meetings to know this isn’t a small issue—it’s the issue.
When profits disappear, the blame usually lands on production, labor, or the builder. But if you follow the trail all the way back, it almost always leads to one place:
The estimate.
That number wasn’t just a guess. It was a commitment—whether anyone treated it that way or not.
And here’s the part nobody likes to admit.
Most companies don’t have a production problem.
They don’t have a scheduling problem.
They don’t even have a labor problem.
They have an estimating problem that shows up everywhere else.
Fix the estimate, and a lot of the “other problems” start to disappear.
Ignore it, and you’ll spend the rest of the job trying to make a bad number look good.
And that’s a game nobody wins.
Gary Fleisher—known throughout the industry as The Modcoach—has been immersed in offsite and modular construction for over three decades. Beyond writing, he advises companies across the offsite ecosystem, offering practical marketing insight and strategic guidance grounded in real-world factory, builder, and market experience.
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