Measure usable width
Measure the clear opening available when a door is in its normal position. Include handles, hinges and other intrusions. Compare the widest part of the open stroller in the configuration you use.
Allow turning room
Width clearance alone does not model a corner, lift depth, slope or crowd. Try the actual route where possible and leave practical room to manoeuvre.
Share the measurement context
State how and where you measured, and whether accessories were attached. Do not post private building access details or photos of other people without permission.