How can we help you? How does the stair lift attach to the stairs? 1 out of 3 found this helpful Our stair lifts install directly to the treads of your stair case, not the wall. There is no need to reconstruct or reinforce walls in order to install. Was this helpful? Yes (1) No (1) Category: General Related Questions How much weight can a stair lift hold? Can you install a stair lift outside? What if my stair lift is on the opposite end of the staircase? How long does the installation take?