Fit & Clearance

Measurements that prevent the wrong order.

Doorway width at the narrowest point (don’t assume standard doors).
Turning space where the device must rotate (bathroom entries are the common failure point).
Overall width of the equipment in-use, not just “frame width”.
Seat/arm/support dimensions that affect transfers (match to the user environment, not preferences).
Height ranges (seat height, handle height, forearm support height) and whether tools are required.
Clearance for brakes/footrests/castors during turns (tilt/position changes can widen the effective footprint).

Measuring the space once and ignoring thresholds/door hardware.
Using brochure dimensions instead of “in-use” clearance.
Forgetting turn radius (the item fits through the door but can’t maneuver inside).
Assuming adjustability solves fit (some adjustments reduce stability or increase footprint).

Information only. For complex needs, consult an appropriate clinician.