Stuart Sliding Door Repair repairs and replaces sliding patio door locks, handle sets and keepers, and can usually restore a door that will not latch in a single visit.
If the lock stopped working after the door got harder to slide, the lock is a symptom and the alignment is the cause.
The single most common sliding door lock call is a door that will not latch, and the single most common cause is that the panel has dropped a few millimetres on worn rollers. The hook throws into the frame instead of the keeper slot.
That distinction matters because replacing the lock on a misaligned door fixes nothing. We check alignment before we quote hardware.
Typical Pricing - Sliding Door Lock and Handle Repair in Stuart
| Service | Typical range |
|---|---|
| Keeper adjustment and latch alignment | $95 - $185 |
| Mortise lock replacement | $165 - $310 |
| Handle set replacement, interior and exterior | $185 - $365 |
| Keyed patio door lock installation | $195 - $395 |
| Secondary security lock or foot bolt | $85 - $195 |
Ranges reflect typical national averages for this work and are shown for guidance only. Final cost depends on door size, glass type, parts and access. Call (772) 279-9387 for a firm quote on your door.
How a Sliding Patio Door Lock Works
Nearly all residential sliding doors use a mortise lock: a slim cassette let into the edge of the panel stile, with a hook or claw that swings out and grabs a slotted keeper mounted on the fixed jamb. The interior handle drives it, and on keyed versions a cylinder drives the same mechanism from outside.
Because the hook only has a few millimetres of engagement, the tolerance is unforgiving. If the panel sits low, or sits proud of the jamb, or the keeper has loosened on its screws, the hook misses. The lock is fine; the geometry is not.
The parts that genuinely wear out are the internal spring, which is why a handle goes floppy and stops returning, and the pot-metal hook itself, which can crack. Both mean a replacement cassette rather than an adjustment.
Signs Your Lock or Handle Needs Work
- You have to lift or push the door to get it to lock. Classic misalignment. The hook is not meeting the keeper squarely.
- The handle flops and does not spring back. The internal spring in the mortise cassette has failed.
- The lock turns but nothing engages. The hook has cracked or come off its pivot inside the cassette.
- The keeper is loose or its screw holes are elongated. Repeated forcing has worked the fixings loose in the jamb.
- The key turns but the door still opens. The cylinder is no longer driving the mechanism, usually a broken tailpiece or cam.
- The door rattles when locked. Engagement is marginal - it is latching by a hair, which is not security.
What We Do About It
We start with the panel, not the lock. Reveal top and bottom, roller height, whether the stile is parallel to the jamb. If the panel has dropped, that gets corrected first, and a meaningful share of lock calls end there with no new hardware at all.
If the hardware is genuinely at fault, we match the cassette. Mortise locks vary in overall length, backset and screw spacing between manufacturers, so this is a measure-and-match job rather than a one-size part.
Where security is the actual goal, a mortise hook alone is modest protection. A keyed cylinder, a secondary foot bolt into the sill, or an auxiliary lock at the head all raise the bar considerably, and none of them require a new door.
Security and Hurricane Hardware on the Treasure Coast
Two separate things get confused here. A hurricane-rated door is about the glass and the frame resisting wind pressure and impact - that is a glazing question, covered on our glass repair page. Lock hardware is about forced entry.
They do overlap in one respect. Doors that are part of a rated impact assembly are certified with specific hardware, so on those units we match or exceed what was originally specified rather than fitting whatever fits.
For everyday security on an older non-impact door, the cheapest meaningful upgrade is not the mortise lock at all. It is a foot bolt that drops a pin into the sill, because it resists lifting the panel out of the track, which is how sliding doors are usually defeated.
Adjusting the Lock vs. Replacing the Hardware
| Repair | Replace | |
|---|---|---|
| Typical cost | Adjustment: under two hundred dollars | New hardware: two to four hundred |
| Time on site | Often under an hour | One visit if the cassette is a stock size |
| Fixes a dropped panel | Yes, that is the point | No, it will fail again |
| Fixes a broken spring or hook | No | Yes |
| Right call when | The lock is intact but misses the keeper | The handle is floppy or the hook is cracked |
| Wrong call when | The cassette itself has failed | The real issue is roller height |
Frequently Asked Questions
In most cases the panel has dropped on worn rollers, so the hook no longer lines up with the keeper slot. Nothing inside the lock is broken. Correcting the door height, or moving the keeper, restores it.
Sometimes. Keyed patio cylinders vary, and whether one can be keyed to an existing system depends on the cylinder type. We will check what is fitted before promising it.
The glass is not usually the weak point, the hardware and the lift-out clearance are. A standard mortise hook has only a few millimetres of engagement, and a panel can often be lifted clear of the track. A foot bolt addresses both cheaply.
If the unit is part of a certified impact assembly, the hardware was included in that certification, so it should be matched or exceeded rather than substituted freely. On non-impact doors you have far more latitude.
That is normally a failed spring inside the mortise cassette, which is a replacement rather than a repair. It is a straightforward job once the correct size cassette is matched.
Other Sliding Door Services in Stuart
Need Sliding Door Lock and Handle Repair in Stuart?
Tell us what the door is doing and we will tell you what it needs, with a price range before we start.
Call (772) 279-9387 Request a Quote