You probably found this question the way most long-distance daughters do: a photo from your parent, a note that the tub feels slippery, and a phone call that ends with 'I'm fine, I just don't like the tub.' This guide walks the install from first look to final pull test, so the person on site and you both know who does what at each step.
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.
Step one: the survey
Ask the local helper to walk into the bathroom with a stud finder, a tape measure, and your parent's habits in mind. Ask them to photograph the wall at the tub edge, the wall beside the toilet, and any spot where your parent reaches for something to steady a step. Have them name the wall type: plaster, drywall, cement board behind tile, or tile over something they cannot see. Each answer changes the hardware you need.
Step two: place the bar where the hand lands
A grab bar belongs where your parent's hand naturally goes when sitting down, standing up, or turning on the water. That is often not where the old towel bar sits. Have your parent show the motion in person or on a video call, and mark the spot with painter's tape before anything gets drilled. Ask the helper to confirm that at least one anchor point lands in solid framing or a backing plate, not only in the wall surface. If no framing lines up, stop and ask whether a different spot or a different mounting method is the better choice.
Step three: read the box before you buy
Compare the packaging line by line. Look for the stated load rating, the wall types the maker says the bar is designed for, the length and projection from the wall, and whether the mounting screws come in the box. Be cautious with any bar whose listing does not name the surface you actually have. A rating only means something when the wall it is mounted to matches the wall the maker describes. Keep the box, the receipt, and a photo of the label in the shared folder.
Who does the install
A handy local helper can drill into studs when they are comfortable with the tools and the wall type. Tile, cement board, and anything the helper is unsure about belongs with a licensed contractor who can explain how they will anchor it. Settle that before the day is booked, and write the installer's name and phone number in the folder. Nobody should be guessing about the wall while your parent is in the bathroom.
Install day
Ask for three things on the day: that the marks match the photos you approved, that the drill depth and screw length match the packaging, and that nothing gets tightened into a hollow spot just to finish. If the installer hits a surprise such as a pipe, a wire, or soft wood, they should stop and call you before they improvise. You approve changes to the plan, and the installer's job is to pause and ask.
The pull test
Once the bar is up, have an adult you trust pull on it slowly from several angles: straight out, down toward the floor, and across. Watch for any movement, creak, or screw that turns. Do not let anyone put their full weight on the bar until the installer has finished the check and you have seen it. Ask for a photo of the finished bar from two angles, and a photo of the anchors if they are visible.
After the install
Put a reminder in your calendar for a re-check in about a month. The helper should look at the screws, any caulk line, and the wall around each anchor, then send you a short note. Bathrooms stay damp and screws loosen with use, so the first check is not a one-time event.
Tonight
Text the local helper the bathroom photos and ask them to find the studs at the spot your parent actually uses. Ask them to name the wall type in one word. Then call your parent and ask them to show you, on video, how they get up from the tub or the toilet. Do not decide the placement from your own phone angle alone.
What to leave with the doctor
Bring a short list to the next visit: which movements feel unsteady, whether the trouble is at the tub, the toilet, or both, and whether a physical or occupational therapist has looked at the bathroom. Ask whether a grab bar is the right support for those movements or whether something else should come first. The doctor and therapist decide what your parent needs. Your job is to bring the photos and the list.
If you need a St. Louis helper for the survey and install, the Local Help for a St. Louis Parent page lays out what to ask. The Sources page lists where this guidance comes from.