Sliding Glass (Arcadia) Door Won’t Lock? How to Fix the Latch

Most sliding glass doors (called Arcadia doors in Arizona) that won’t lock have a line-up problem. The hook latch inside the handle has to catch a metal keeper on the frame. If the door has dropped or the keeper has moved, the hook misses. Adjusting the bottom rollers or the keeper usually fixes it without replacing the lock.

Tap to watch

Do I Really Need a Locksmith? · Bill’s DIY series

“I can do this myself.” Do I really need a locksmith?

Verdict: You've got this

Related: Bill on locking patio-style French doors

Get the Patio & Sliding Door Checklist →$4.99 · instant PDF download

How a sliding door lock works

Most sliding glass doors, including the Arcadia doors common in Arizona homes, use a hook latch (a mortise latch) mounted inside the edge of the door. When you flip the lever, a curved hook swings out and grabs a metal keeper (strike) screwed to the door frame. If the hook and keeper don’t meet, the lever may move but the door won’t stay locked.

Find why it misses

1. Open the door and work the lever. If the hook swings out and back smoothly, the lock itself is probably fine.
2. Close the door slowly and watch the gap. Look at where the hook lines up with the keeper. Is it high, low, or not reaching?
3. Check the track. Dirt, pebbles or a bent track can stop the door from closing fully, so the hook never reaches the keeper.
4. Check the latch screws. Loose screws on the door edge let the latch body shift.

Adjust the rollers

Most sliding doors sit on adjustable rollers at the bottom. Look for small adjustment screws near the bottom corners, on the edge or face of the door. Some have caps over them.

• Turning the screws raises or lowers that corner of the door.
• Raise or lower in small turns, then test.
• Keep the door level so it rolls smoothly and closes evenly against the frame.

Clean the track first. A vacuum and a damp cloth help the rollers sit right.

Adjust the keeper

The keeper on the frame usually has slotted holes. Loosen its screws, slide it up or down to meet the hook, then tighten. If it needs to come closer to the door, some keepers have adjustment screws or can take thin shims.

Latch hook problems

If the hook won’t swing out, swings out only partway, or feels loose, the latch itself may be worn or broken. Many sliding door latches are sold as replacement parts. See sliding door lock replacement.

Make it safer while you’re there

A sliding door that only depends on its latch is easier to force than most front doors. A security bar or extra pin lock is a cheap upgrade. See sliding door security bars and extra locks. For the full checklist, the Patio & Sliding Door Checklist walks you through it.