Gowning rooms are frequently designed by copying whatever the previous project used, which is why so many pharma sites end up with congested change areas at shift start.
Start with a queuing simulation. Feed in the number of operators per shift, the average gowning time, and the acceptable wait target. A 90-second wait is a good benchmark for GMP sites.
Next, resist the temptation to combine airlocks with sit-down changing. Sit-down zones must be pressure-neutral to the process side, or the seated operator drags contamination inward every time they stand up.
Finally, plan for growth. Overprovision floor tiles by 20% so future partitions can shift without breaking the wall-panel modularity. This one detail has saved several of our clients from disruptive expansions.