Growth consumes free locations first
A warehouse with 90% occupancy does not necessarily have 10% easy growth remaining. Location mix, SKU compatibility, staging and operational constraints can make the last available capacity much harder to use.
Model several growth rates
A simple one-year forecast can compare modest, expected and high-growth scenarios. Longer horizons should also consider product-mix change because the number and size of storage locations may change even when unit volume grows smoothly.
Define a trigger point
Rather than waiting until the building is full, establish a utilization or peak-capacity trigger for evaluating re-slotting, additional racks, overflow, 3PL use or a facility change. The trigger should be based on observed performance, not a universal internet benchmark.
Keep uncertainty visible
Forecasts are estimates. Showing a range is often more useful than presenting one precise number that implies more certainty than the business actually has.
Practical questions
Should I use one utilization percentage for every warehouse?
No. Inventory profile, storage system, seasonality, staging demand, handling equipment and workflow can make the same percentage perform very differently in two facilities.
Can this guide be used to approve a rack or building change?
No. It is a planning resource. Structural, fire, building, accessibility and workplace-safety requirements must be established for the actual facility by the appropriate qualified parties and authorities.