Why won't my sliding glass door lock?

Almost always the mortise lock body inside the door has worn out or the strike plate is misaligned. Both are quick repairs - usually under an hour. If you have to lift the door to engage the lock, it's a roller problem, not a lock problem.

Can a sliding glass door lock be replaced without changing the whole door?

Yes. The mortise lock slides out of the door stile after removing the handle. We replace it with a new one and you're done - no door replacement needed.

Are sliding glass door locks secure?

A properly working mortise lock with a steel latch hook and aligned strike is comparable to a standard deadbolt. For extra security, we can add a secondary foot-bolt, pin lock, or charley bar that prevents the door from being lifted off the track even if the main lock is defeated.

Can you re-key my sliding glass door to match my house keys?

Yes — most sliding-glass-door cylinders can be pinned to match a standard Kwikset or Schlage keyway on site for a small added fee.

How much does sliding glass door lock repair cost?

Every lock and handle repair is a flat written price quoted on site before any work — typically a small fraction (around 10–15%) of replacing the entire door.

Do you install smart locks or electronic deadbolts on sliding glass doors?

We don't - we install mechanical mortise locks only. Smart locks designed for sliding patio doors are a small market and most fail in coastal salt air. A high-quality mortise plus a secondary foot bolt is more secure than most smart options.

What is a charley bar and should I add one?

A charley bar is a hinged metal bar that drops into the track to physically block the door from being slid open. For ground-floor or vacation-rental doors it adds meaningful security at low cost. We install them in 15 minutes.

Can you fix a broken sliding glass door handle without replacing the lock?

Sometimes - if only the handle assembly is broken and the mortise still operates, we can swap just the handle. About 60% of the time the mortise has also failed and we recommend replacing both during the same visit.

Sliding Glass Door Lock & Handle Repair

TL;DR

If your sliding glass door doesn't lock, the latch doesn't catch, or the handle is loose and rattly, the mortise lock inside the door stile has almost always failed. We carry replacement mortise locks for every major brand and replace them in 30-60 minutes.

What is lock & handle repair?

Sliding glass door lock and handle repair is the replacement or adjustment of the mortise lock body, latch hook, handle assembly, keyway cylinder, and strike plate that secure a sliding patio door - performed without removing the door panel or replacing the entire unit.

A sliding glass door is locked by a mortise lock - a rectangular brass or steel mechanism roughly the size of a deck of cards, tucked inside the vertical stile behind the interior handle. When you push the handle down, the mortise body throws a steel latch hook out into a strike plate mounted on the jamb. Over 10-20 years of daily use (and salt-air corrosion in coastal Florida), the internal springs weaken, the latch hook bends, or the cylinder cam slips. Once that happens, the handle moves but the latch no longer extends, and the door simply won't lock.

Replacing the mortise lock is one of the cleanest repairs on a sliding glass door. We carry the common mortise bodies for PGT, CGI, Andersen, Pella, Milgard, Custom Window Systems, and Jeld-Wen on every truck. The interior and exterior handles come off, the old mortise slides out of the stile, the new one slides in, the strike plate gets re-aligned, and the door locks like new - usually in under an hour. We can also re-key the new cylinder on site to match an existing house key.

Symptoms we'll fix

Door won't lock - handle moves but latch doesn't catch
Handle is loose, wiggles, or pulls out from the door
Key won't turn or sticks in the cylinder
Latch hook is bent or won't extend
Strike plate is bent or pulled away from the jamb
Door has to be lifted or shoved to engage the lock
You can lock the door from inside but not from outside (or vice versa)

How the repair works

1
Diagnose the lock body
Most sliding-glass-door lock problems are inside the door - the mortise lock body itself has worn out, not the handle or keyway.
2
Remove handle assembly
Both interior and exterior handles come off so the lock body slides out of the door stile.
3
Match and replace mortise
We carry common mortise locks for PGT, CGI, Andersen, Pella, and most aftermarket sliders on every truck.
4
Re-key if requested
If you want the new lock keyed to match an existing key, we can re-pin on site.
5
Adjust strike & test
We align the strike plate so the latch catches cleanly every time - no more lifting or shoving the door to make it lock.

What drives the scope

Every lock & handle repair quote is flat-rate and written down on site before any work begins — typically a small fraction (around 10–15%) of what replacing the whole door would cost. Here is what shapes the scope of the job.

Mortise lock replacement only: Standard PGT, CGI, or Andersen lock body. Most common scenario.
Mortise + interior/exterior handles: When the handles are also worn, broken, or have stripped screws.
Re-key new cylinder to match house key: Done on site, no extra trip.
Secondary lock install (foot bolt or charley bar): Optional added security for ground-floor or vacation properties.
Hardened steel latch hook upgrade: Resists prying. Recommended for ground-floor doors.

Parts and materials we use

We stock the exact parts for every major Florida slider brand on every truck. No second visits to source parts for a lock & handle repair job.

Mortise lock bodies: PGT 1395, CGI Sentinel, Andersen Perma-Shield, Pella Architect, Milgard Tuscany, Jeld-Wen IWP
Hardened-steel latch hooks (salt-rated)
Brass and stainless strike plates
Schlage and Kwikset-compatible re-keyable cylinders
Secondary security hardware: foot bolts, pin locks, charley bars

What's included

Free on-site diagnostic and written flat-rate quote
New mortise lock body installed
Strike plate re-alignment
Handle re-tightening or replacement (if quoted)
Operation test from inside and outside
2-year parts and service warranty

What's not included

Smart-lock or keypad integration (we install mechanical locks only)
Re-keying every other lock in the house (we re-key the new cylinder only)
Door alignment for severely dropped panels (that's a roller job)
Wood-jamb repair for splintered strike-plate areas (carpentry separate)

Troubleshooting your sliding glass door

Use this triage table to identify what's actually going wrong before you call. We diagnose for free on site, but knowing what you're seeing helps us bring the right parts.

Symptom	Likely cause	DIY check
Handle moves but the door doesn't lock	Mortise lock body failed internally	With the door open, push the handle down and look at the latch hook. If it doesn't extend, the mortise is dead.
Handle is loose and wiggles	Mounting screws stripped or handle spindle worn	Try snugging the two visible interior screws. If they spin freely, the threads are stripped and the handle needs replacement.
Key turns halfway then stops	Salt corrosion inside the cylinder	Spray a graphite or silicone lubricant (never WD-40) into the keyway. If it doesn't free up in 10 minutes, the cylinder is shot.
Door locks from inside but not outside	Exterior keyway cam has slipped or broken	Check whether the key spins freely without engaging anything. If yes, the cam is broken inside the cylinder.
Door must be lifted to engage the lock	Door has dropped - this is actually a roller problem, not a lock problem	Measure the gap between latch hook and strike. If misaligned by 1/8" or more, fix the rollers first.