Separate Seat Fit From Room Fit
A chair can fit beneath a desk while failing to provide an appropriate seated position for its occupant. Plastic base office chairs with fixed seat depth should therefore be assessed at both scales. First, ask the user to sit naturally against the backrest and check comfortable clearance behind the knees. Then observe the relationship with the desk and everyday equipment. Finally, examine the surrounding floor space during entry and exit. Recording these checks separately makes it easier to identify the source of a problem. It also prevents a convenient furniture arrangement from becoming the only reason for assigning a particular seat.
Measure the Actual Base Footprint
The word plastic does not indicate how far a base extends or how it interacts with nearby furniture. Obtain the relevant dimensions and compare them with the planned desk arrangement. Include supports, drawer units and other objects below the work surface. Where office chairs need to move within a restricted area, observe that movement with a person seated and during a normal departure from the desk. Review the fitted floor-contact components and relevant guidance for the surface. A drawing remains useful, but its measurements should be checked against the complete chair and the activities expected within the space each day.
