The Americans With Disabilities Act (ADA) specifies certain requirements that affect lockers. Only single tier and double tier lockers will meet those requirements. To comply, at least 5% of the lockers provided, but no less than one locker, needs to meet the ADA requirements. Link to federal ADA Requirements page
For single tier lockers, the shelf and coat hooks must be lowered to no more than 48" above the floor. An extra shelf also needs to be added to bring the bottom of the locker to no lower than 9" above the floor. In addition, only recessed handles with multi-point latching meet the ADA specifications.
On double tier lockers, an extra shelf also needs to be added to bring the bottom of the locker to no lower than 9" above the floor. Only the lower opening may be used for ADA compliance. In addition, only recessed handles with multi-point latching meet the ADA specifications.