A stair lift is a single purchase that turns into a sequence of visits, paperwork, and a final test. Most of the trouble people report comes from skipping a step or assuming the next one covers it. Walk through the process in order and you will know, at each point, what should be on paper and what should be running.
Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.
The survey
Before anyone measures, ask who will come to the house and whether they will measure the staircase on site. Have them record the length of the stairs, the width at the top and the bottom, and how much room the seat needs to fold at each end without blocking a doorway or a landing. Ask whether the stairs are straight or have a turn, because a curve changes the track and the price of the track. Ask whether the surveyor checks the outlet the lift will plug into and whether a new outlet would be needed.
The written quote
A usable quote lists the chair, the track or rail, the installation labor, the power connection, any permit line, and whether removal is included if the lift has to come out later. Read the exclusions first. Ask how long the quote is good for and what triggers a new one. If a line says included but doesn't say what it covers, ask for the exact words before you agree.
Install day
Someone should be in the house who can answer questions and move any furniture the crew needs to reach. Clear the stairs and the top and bottom landings, and keep pets in another room. Ask who will be on site, roughly how long the work takes, and whether the crew will show you each safety feature working before they leave. Those features usually include the seat belt, the obstruction sensor, the swivel, and the folding footrest.
Training and the test run
Have your parent sit in the chair and run it up and down with the controls, with the installer watching. Ask the installer to show you where the key or remote is stored and how to call the chair back to the bottom. Ask for the owner's manual, the warranty paperwork, and the phone number for service, and put them in one folder before the installer leaves.
The first week
Use the lift several times a day while the installer's number is easy to find. Watch for a stop partway up or down, a noise that changes, or a battery that doesn't charge. Write down what you see with the date and time, and call the installer with the note in hand. Do not wait for the next scheduled visit to report a problem that happened on the first day.
Tonight
Measure the stair width at the top and the bottom and write both numbers on the quote request. Find the installer's name and the number to call, and list the three questions you still have about the survey, the exclusions, and the test run. If your parent will be home on install day, plan the morning around the crew.
What to leave with the doctor
Bring a short note on which steps are hardest, whether your parent feels steady on the stairs, and whether they have been avoiding the stairs altogether. Ask the doctor whether a therapist assessment would be useful before the lift goes in. The doctor decides what is right for your parent, and the note gives them something specific to answer.
If you want someone in St. Louis to be present on install day and check the test run, the local help page describes how to arrange that.