Mortise Lock Repair & Replacement

A mortise lock is a complete locking assembly — latch bolt, deadbolt, strike plate hardware, and sometimes an alarm contact — housed inside a rectangular pocket (the mortise) cut directly into the door edge. Unlike a cylindrical lock set that sits in two simple bore holes, a mortise lock set requires a precise, deep cavity machined into the door stile. That construction is what makes these locks exceptionally strong and tamper-resistant, and it is exactly why New York City building codes and developers favored them heavily from the early 1900s through the 1970s. Walk through almost any apartment building between Yankee Stadium and Pelham Bay and you will encounter them on nearly every unit door.

Today you will find mortise hardware from legacy commercial brands like Corbin Russwin, Baldwin mortise lock models still in service in institutional buildings, and newer additions such as the electric mortise lock used in access-controlled multifamily properties and the smart mortise lock that combines electronic credentials with the same heavy-duty chassis. There is also a specific variant — the sliding door mortise lock — designed for pocket and barn-style doors, which appear in older Bronx homes that have been renovated but kept their original door frames. Whatever version is installed on your property, our team works on all of them.

Sticking and seizing are the most frequent complaints we receive from Bronx residents. Over time, door frames shift — a reality in older masonry buildings where seasonal temperature swings and decades of minor settling are unavoidable — causing the bolt or latch to bind against the strike plate. Lubricants can buy time, but if the geometry is off or internal parts are worn, a proper mortise lock repair means adjusting the strike plate position, servicing the internal cam and follower, replacing worn springs, or re-cutting the mortise pocket itself if the door has been re-hung. We also handle broken spindles (the square bar that connects your door knob to the latch mechanism), stripped or cracked face plates, failed cylinder retaining screws, and cases where the mortise lock cylinder has been forced or damaged during a break-in attempt.

Beyond mechanical failures, we frequently get calls about keys that no longer turn smoothly — often a sign that the cylinder's internal pins are worn or that a key was cut to a worn original and is now too far out of tolerance. In those cases, the repair may be as simple as re-keying the mortise lock cylinder, or it may require a full cylinder replacement if the plug is cracked or the shell is corroded. For building owners and property managers in the South Bronx managing multiple units, we can re-key entire buildings to a master key system so one key opens common areas while tenant keys remain unique — a practical upgrade that eliminates the chaos of dozens of mismatched cylinders. If you need help now, call (347) 708-8794 — we answer 24/7 and dispatch a technician straight to your address.

When repair is no longer cost-effective — because the lock body is cracked, the internal casting has fractured, or the door has been upgraded and the old unit no longer fits properly — replacement is the right call. For a mortise lock set exterior door application, the replacement unit must match the existing mortise pocket dimensions (backset, height, and width of the case) or the door will need to be re-mortised. Our technicians carry measuring tools and a selection of lock bodies on the vehicle, and we can advise you on direct-swap options that avoid additional carpentry work. For Bronx apartment buildings subject to NYC Multiple Dwelling Law, we also confirm that any replacement hardware meets the minimum security requirements for residential entry doors before installation.

For property owners looking to modernize without losing the door's original character, there are now smart mortise lock options that fit a standard mortise pocket and add keypad, fob, or smartphone access — ideal for short-term rental units or buildings with high tenant turnover. Electric mortise lock configurations are also available for doors that need to integrate with a buzzer or access-control panel already wired into the building. Whatever direction you choose, our team sources quality hardware, installs it correctly the first time, and tests full operation — latch, deadbolt, inside release, and outside cylinder — before we leave your property.

South Bronx Locksmith is your local locksmith in The Bronx, NY for a wide range of residential, commercial, and automotive needs — not just mortise lock work. We handle door knob lock replacements, deadbolt installations, high-security lock upgrades, mailbox locks, padlock removal, gate locks, storefront lock replacement, commercial locksmith services for offices and retail spaces, lock-out response for apartments and houses, and car lockouts for drivers who suddenly find themselves locked out and need to get somewhere fast. If you cannot open your car door and are in a rush, call us — a mobile technician will come to your exact location, verify ownership, and get you back in without damaging your vehicle. We also install and repair emergency exit hardware, push bars, and electric strike systems for commercial properties throughout the borough. Our full service list includes: residential lockout response, commercial lockout response, automotive lockout assistance, mortise lock repair, mortise lock replacement, deadbolt installation, lock re-keying, master key system setup, high-security lock installation, smart lock installation, electric lock and access-control hardware, sliding door lock repair, door knob lock replacement, padlock opening and replacement, mailbox lock service, gate and garage lock repair, storefront glass door lock service, file cabinet and desk lock service, safe opening and combination change, broken key extraction, door frame and strike plate repair, lock cylinder replacement, key duplication on-site, intercom and buzzer system coordination, and emergency board-up referral after a break-in. All services are available around the clock — 24/7 locksmith response is not a marketing line for us, it is simply how we operate. Call (347) 708-8794 any time to reach a live dispatcher.

Questions like how much is a locksmith in the Bronx, how much should locksmiths charge, how much does a locksmith charge per hour, how much should an emergency locksmith cost, and who is the cheapest locksmith come up constantly — and they are fair questions. The honest answer is that no responsible locksmith can give you a meaningful number without knowing the specifics of the job. For mortise lock work, the factors that shape the final price include the type and brand of lock body involved (a standard residential unit differs significantly from a Corbin Russwin mortise lock used in a commercial or institutional door), whether parts need to be sourced or are already on the truck, the time of day the call comes in, travel distance to your location in the Bronx, and the condition of the door and frame. A simple re-key costs far less than a full mortise re-mortise with a new lock body, for example. What we commit to is this: before any work begins, our technician provides you with an exact, all-in price — no surprise charges added after the fact. We do not use bait-and-switch estimates. If the scope changes once the door is opened and something unexpected is found, we tell you immediately and get your approval before proceeding. For anyone asking who is the best locksmith near me in Bronx, NY — the answer should always be the one who shows up promptly, explains what needs to be done, and gives you a firm price before touching your lock. That is the standard we hold ourselves to on every single call.

Yes on both counts. We provide genuine 24/7 locksmith coverage across The Bronx — not a call center that relays messages overnight, but actual dispatched technicians available any hour, any day, including weekends and holidays. When a tenant gets locked out at 2 a.m. on Morris Avenue or a property manager needs a lock changed on a just-vacated unit in Co-op City before the new tenant moves in, we respond. Lock changes and fresh installations are core to what we do. Whether you need a straightforward knob-and-deadbolt swap, a full mortise lock set installed on an exterior door, or a smart lock added to an interior unit door, our team brings the tools and hardware to complete the job in one visit. We also address issues like do you solve issues with a lock change and installation directly — yes, we handle the full scope from removing the old hardware, preparing the door (including filling old bore holes or adjusting the mortise pocket if dimensions differ), installing the new lock, testing it thoroughly, and handing you working keys or programming credentials before we leave.

Mortise locks are embedded inside the door, which means poor technique during removal or repair can crack the door stile, strip the mounting screws, or damage the finish — especially on older wood doors common in Bronx row houses and brownstones. Our technicians are trained specifically on mortise hardware and approach every job with the goal of leaving your door in better shape than they found it. Where a lock can be serviced in place rather than removed entirely, we do that. Where a cylinder can be re-keyed rather than replaced, we offer that option. Damage-free service is the goal on every call, and our insured status means that in the rare event something goes wrong, you are protected. We are a local business — not a national dispatch network — and our reputation in The Bronx is built one door at a time. Call (347) 708-8794 to schedule service or get immediate emergency help.