Mortise Lock Repair & Replacement

A mortise lock is a complete lock mechanism — latch, bolt, and often a cylinder — housed inside a rectangular case that sits inside a routed pocket (the mortise) cut into the door edge. A standard deadbolt is a single-function tubular device that is surface-bored into the door. Mortise locks offer greater structural integration with the door and are generally harder to defeat by force, which is why they appear on high-security residential exterior doors, historic buildings throughout Houston, and most commercial entry doors that see heavy daily use.

Yes, in most cases the cylinder can be rekeyed or swapped independently of the lock body. The mortise lock cylinder threads or clips into the case and is connected to the internal mechanism by a cam or tailpiece. As long as the body itself is functioning correctly, our technician can extract the cylinder, repin it to a new key, and reinstall it — which is faster and less invasive than pulling the entire lock. We always assess both the cylinder and the body on-site and give you a clear recommendation before starting.

The price depends on several factors: the grade and brand of the hardware (a standard residential lock body costs differently than a heavy-duty commercial or electric mortise lock), whether parts are in stock on our vehicle or need to be sourced, the time of day you call (our team is available 24/7 and after-hours service is reflected in the quote), and how far our nearest technician is from your Houston location. We always confirm a firm, itemized price before beginning any work — you will never get an unexpected charge at the end of the job.

Yes. Sliding door mortise lock hardware — common on historic pocket doors and some patio installations — requires different handling than a standard swing-door set because the lock body orientation and latch direction differ. We also frequently work on antique cast-iron and early brass mortise lock sets in older Houston homes, particularly in Midtown, Montrose, and the Heights. In some cases, internal parts can be rebuilt or sourced from restoration suppliers; in others, a modern replacement body can be adapted to fit the existing mortise pocket. Our technician will advise on-site.

Absolutely. An electric mortise lock body replaces the standard mechanical case with one that accepts a power connection, allowing a remote buzzer, card reader, keypad, or access-control panel to release the latch or bolt. A smart mortise lock typically uses a modernized cylinder module — often Bluetooth or Z-Wave — paired with a standard or upgraded lock body, letting you control access from a phone app. Both are popular upgrades for Houston medical offices, law firms, and multi-tenant residential buildings. Our technicians install, wire, and test the full system on-site.

A legitimate locksmith will arrive in a clearly identified vehicle, present a technician ID when asked, provide a written quote before starting any work, and never pressure you into services you did not request. At Houston Pro Locksmith, our trained and insured technicians follow all of these practices on every call. We also require proof of ownership or authorization before opening any locked door or vehicle — this is a professional standard that protects you. If you ever feel uncertain, you have every right to ask for credentials and a written quote before any work begins. Call us directly at 713-231-0766 to verify your technician's dispatch.