The stair rail is the one support your parent reaches for without thinking, usually when they are tired, carrying something, or going down in the dark. That is why it has to fit the hand that holds it, not the one in the catalog photo. Measure before you order, and write the numbers down so the installer works from the same page you do.

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Measure the grip first

Accessibility guidelines for handrails, including the ADA standards that many building offices use, describe a graspable rail as round and roughly 1.25 to 2 inches across. Have your parent close a hand around a sample such as a dowel or a broom handle, or around a tape wrapped on an existing rail. If the fingers do not meet the thumb with a little room to spare, the rail is too thick. If the hand slides around without closing, it is too thin. Test with the hand your parent actually uses, at a time of day when they actually use the stairs, because grip weakens with fatigue.

Check the gap at the wall

The knuckles need room. Accessibility guidelines commonly call for about 1.5 inches between the rail and the wall so the hand does not scrape. Measure from the wall surface or the trim, whichever sticks out further. If the gap is smaller, ask the installer for brackets that move the rail out from the wall rather than accepting a hand that rides against it.

Set the height at the wrist

Measure from the front edge of a stair step, called the nosing, straight up to the top of the rail. Many building codes put stair rails in the mid-30 inch range, but the number that counts for your house is the one your local building office gives. Then check the parent. Have them stand on a step with their arms relaxed at their sides, and mark the crease of the wrist. The top of the rail should land near that mark, not so high that the arm has to lift and not so low that the wrist has to bend.

Measure the run and the extensions

Measure the length from the top landing to the bottom step, then add the extension at each end. Rails often continue a set distance past the top and bottom steps so the hand has something to hold before the first step and after the last. Ask the installer for the extension length in writing, and confirm it matches your local code or the rail maker's instructions. A rail that stops right at the nosing of the top step leaves the hand with nothing to hold at the point where the body is changing direction.

Check the wall before you trust the rail

A rail is only as strong as its anchors. Brackets should go into wall framing or solid blocking, not drywall alone. Ask the installer where the studs are, how far apart the brackets sit, and which fasteners they use. Once the rail is up, test it the way your parent will use it: a firm pull with a steady hand, starting at the top. If a bracket moves at all, stop and have it corrected before anyone uses the rail again.

Decide which side, and how many rails

Most staircases have a wall side and an open side. Note which side your parent uses going up and which going down, since many people favor one side for both. A rail on the wall side is the simplest fit. An open side needs brackets or posts that handle more load, and sometimes a different profile, so ask the installer whether the open side is part of the quote. Two rails, one on each side, give more choice but take more wall and cost more. Compare the options on paper, not from memory.

Compare a hired install with doing it yourself

Compare a hired installer and a self install on three points: who finds the studs, who holds the warranty paper, and who comes back if the rail shifts after the first month. A hired installer should answer those questions in writing. With a self install, you own every one of them. If you do it yourself, still follow the measurements in this guide and do the pull test before anyone grips the rail.

Write the numbers down before ordering

Keep one page with the grip diameter, the wall gap, the rail height at the nosing, the run length, the extension at each end, and the stud locations. Add the wrist-crease mark your parent gave you. Give a copy to the installer and keep one in the house file. When the rail arrives, check it against that page. If a number is off, the rail is wrong, not your parent, and you are allowed to send it back.

The Sources page lists the accessibility standards this guide draws on, so you can show them to the installer or the building office.