A stair gate is only useful if it stays closed, latches on its own, and holds when someone leans on it. The install is simple, but the order matters, and most failed gates fail because one step was skipped.

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Before you buy: measure and read the label

Measure the width of the opening at the top and at the bottom, because they are not always the same. Compare each measurement with the width range printed on the gate. Note which way the gate needs to swing, toward the stairs or away from them, and check that the door or wall has room for that swing.

Read the manufacturer's manual for the top of the stairs. Many pressure-mounted gates are not rated for the top, and some are not rated for stairs at all. If your opening is at the top, check the rating before you buy.

Choose the mount

A hardware-mounted gate screws into the wall or the frame. A pressure-mounted gate holds itself in the opening by tension. Hardware mounts take more time and a drill, but they are the choice when the gate must hold against a heavy push. Choose the mount the manual calls for in your opening, not the one that is quickest to set up.

Install in order

First, use a stud finder to locate the framing around the opening. Mark the centers of the studs or the solid frame at the height the manual gives. Second, drill pilot holes, so the wood does not split. Third, fix the mounting hardware to the wall or frame, and check that it does not move under your hand. Fourth, attach the gate to the hardware and set the latch. Fifth, adjust the tension or the hinges until the gate sits square in the opening.

Test it before anyone uses it

Push the gate toward the stairs and pull it toward you, using your full body weight. Check that the mounts do not loosen and that the gate does not shift in the frame. Close the latch with one hand, and confirm it catches without a second try. Look for gaps between the gate and the wall or frame that are wider than the manual allows. If the gate passes, write the test result and the name of the person who did it on the inside of the box or in your folder.

Who owns the next check

Name the person who checks the gate each week, and what they look for: loose hardware, a latch that sticks, or a gap that has opened as the house settles. If the wall is plaster, the frame is not solid, or the mount does not hold, stop and ask a professional who works on your type of wall before you continue. For more on where to find help near you, see the About page, which explains how this desk approaches practical household work.