By Scott Zahn
When a warehouse starts bursting at the seams, I’ve noticed the gut reaction is almost always the same: build more, lease more, or find a bigger footprint.
It looks like a reasonable request on paper. After all, when you walk the floor, the building looks full.
But here’s the question I’ve learned to ask after years in this game: Is that building actually full, or is the space being utilized poorly?.
That’s what I call the space illusion. It’s that gap between how much room you think you have and what’s actually available if you manage it right. Misdiagnosing a flow problem as a space problem is one very expensive mistake for your operation.
Where the Space Actually Goes
In my experience, you don’t usually need more walls; you need to fix three specific patterns that eat up your capacity like a termite. Most of the time, you can’t see them just by walking the aisles, you have to look at the data.
1. High-Velocity SKUs in the Wrong Zip Code
When your fast-movers are tucked away in the back corners, your pickers spend more time hiking than picking. We know that up to 60% of a picker’s day is spent traveling, not pulling product. Usually, that’s because items were slotted by “wherever they fit” instead of where they belong based on how fast they move.
2. Traffic Jams and Dead Zones
Every facility has its own “rush hour.” Some aisles are constant bottlenecks while the path right next to it stays ghost-town quiet. Without a heat map to show you where the actual activity is, you’re just guessing where the congestion starts.
3. The New Hire Tax
With warehouse turnover rates nearly 40% annually, you’ve always got people who are still learning the ropes. A new hire can be 15-25% slower than a veteran. If your layout is already a mess, that “ramp-up penalty” just gets worse, creating even more congestion.
If you say…
You’re looking at…
But you should ask…
“We need more space”
A multi-million dollar lease or build
What does our pick-path heat map actually show?
“We need more people”
Roughly an additional 20-30% of salary in onboarding cost
Are the people we have traveling efficiently?
“We need more automation”
A six-figure check for tech you might not be ready for
Are there ways to get more efficiency out of the investments we’ve already made?
“We need a new WMS”
Many years of implementation headaches and unforeseen costs
Are we acutally using the data our current WMS is already collecting?
Using What You’ve Already Got
Your WMS, devices, and people are sitting on a goldmine of data, from transaction logs to putaway records and pick confirmations. The problem isn’t a lack of data; it’s that the information is disparate, unmapped, and difficult to access. Because these data points are often unsynchronized and buried in tables that no one queries, they fail to provide the actionable insights you need to expose slotting drift and congestion patterns.
To really see what’s going on, you also need these three things:
- ABC Velocity Mapping: Figuring out which SKUs are your “all-stars” and moving them to the “golden zones” near shipping.
- Heat Maps: Visualizing where pickers are actually spending their time so you can spot the dead zones.
- Peak Modeling: Designing for the busiest days, not just the averages.
My Advice? Start Small.
You don’t need a six-month consulting project to get answers. Start by pulling 90 days of your WMS data. Map your fastest-moving SKUs against where they actually sit on the shelf. Once you quantify the travel time you can cut, you might find that you’ve “unlocked” 15–30% more throughput without laying a single new brick.
At Mountain Leverage, we’ve built tools to do this locally, meaning your data stays in your building. We can help you turn those messy WMS tables into a real action plan in under 90 days.
Before you sign that next lease, connect with us. The “extra” space you’re looking for might already be right under your nose.
