Door Knob & Knob Lock Installation

Installing or replacing a door knob with lock and key is more involved than it looks from the outside. A proper installation starts with verifying the door's backset — typically 2-3/8 inches or 2-3/4 inches on most New York doors — then confirming the cross-bore diameter, the face bore, and whether the existing latch pocket needs to be modified. On older Greenwich Village townhouses and West Village brownstones, door prep dimensions can be non-standard, which means off-the-shelf hardware sometimes requires careful adjustment before it seats correctly. Our technicians carry tools to bore, chisel, and refit on the spot.

Once the hardware is confirmed, the knob lock assembly — exterior knob with keyed cylinder, interior turn-knob or keyed knob, latch bolt, strike plate, and all mounting hardware — is fitted and tested for smooth operation under door pressure. The strike plate is mortised flush into the door jamb and secured with long screws that anchor into the stud behind the casing, which dramatically increases resistance to kick-in attempts. We also inspect the door gap and alignment, because a door that has shifted or settled — common in older NYC buildings — can cause even a brand-new lock to bind or fail prematurely.

A standard knob lock is a cylindrical lock set that fits through two bored holes in the door — widely used on interior passage doors, bedroom doors, bathroom doors, and as secondary hardware on entry doors across New York apartments and townhouses. A mortise lock, by contrast, is a heavy-duty lock body that sits inside a rectangular pocket cut into the door's edge, combining a latch, deadbolt, and sometimes an auxiliary bolt in a single case. Mortise lock installation is common on entry and vestibule doors in older Manhattan buildings, where the original door prep already accommodates that format. Our team works across both formats and can advise which best suits your door construction and security requirements.

For entry doors, knob locks alone are generally considered secondary security — they are most effective when paired with a deadbolt or used on interior rooms. If you are upgrading an entry door and wondering whether a cylindrical knob lock, a mortise lock, or even a smart lock installation might be most appropriate, our mobile locksmiths can assess the door in person and walk you through the options before any commitment is made. We work with quality hardware from manufacturers such as Schlage and Kwikset and can source the grade and finish that matches your existing hardware.

Locked out because a knob lock cylinder failed, a key snapped inside, or a landlord changed the locks without proper notice? These situations happen constantly across New York City — on busy weekday mornings in the West Village, late on a Saturday night in SoHo, and at every inconvenient hour in between. As a 24/7 mobile locksmith service, Greenwich Village Locksmith NYC answers calls around the clock and dispatches directly to your address. There is no need to wait until a storefront opens. Our emergency locksmith technicians arrive equipped to handle lock-out openings, cylinder replacements, and full door lock installation on the same visit.

When you call (646) 681-5789 for an emergency, a real person answers. We ask for your location, describe the situation, and provide a clear up-front price before our technician begins any work. Factors that influence the final quote include the type of lock and hardware required, the time of day, travel distance to your address, and any parts needed that are not standard stock. We do not inflate emergency pricing without disclosure — you know exactly what you are agreeing to before the job starts. For commercial locksmith calls — office suites, retail spaces, restaurants — we handle after-hours emergency response as well, because a business that cannot lock its front door at closing is a serious liability.

Our installation and replacement work covers a broad range of needs across residential, commercial, and mixed-use properties throughout New York. The following is a representative list of the specific services our trained technicians perform: keyed entry door knob lock installation, interior passage knob installation, privacy knob installation for bathrooms and bedrooms, dummy knob fitting for non-latching closet doors, cylindrical knob lock re-keying to a new key, knob lock cylinder replacement after key breakage, strike plate replacement and reinforcement with long-throw screws, backset adjustment for non-standard door prep, mortise lock body installation and replacement, mortise lock cylinder re-keying, mortise lock faceplate and strike alignment, deadbolt addition alongside existing knob hardware, smart lock installation and keypad knob fitting, Schlage and Kwikset grade-1 entry knob installation, master key system setup for multi-unit residential buildings, commercial knob lock installation on office interior doors, classroom function knob lock installation, storeroom function knob lock installation, knob lock upgrade from Grade 3 to Grade 1 hardware, antique and vintage knob hardware fitting on original pre-war doors, knob lock repair for sticky or binding latches, hinge-side door realignment to correct a binding lock, lock-out opening for knob lock without cylinder damage where possible, duplicate key cutting on-site after new lock installation, and whole-door hardware audit for multi-lock entry doors in NYC buildings.

Whether your need is a single interior knob on a studio apartment in the Village or a full commercial locksmith retrofit across multiple suites, our team arrives with the tools and stock to handle it in one visit whenever possible. We work in occupied buildings with care for neighbors and building management, and we carry insurance so building supers and property managers have peace of mind when granting us access.