Door Knob & Deadbolt Installation

Installing a door knob lock or a deadbolt sounds straightforward until you are standing in front of a door with an odd bore size, a metal frame, or a 1970s mortise lock pocket that does not accept a modern cylindrical lockset. Our technicians assess the door thickness, the existing bore holes, the frame condition, and the strike-plate alignment before recommending any hardware. Getting those details right is what separates a secure, smoothly operating lock from one that binds, leaves gaps, or fails within a year. We work damage-free wherever the existing door and frame allow, meaning we look for every way to use what is already there before reaching for a drill.

A typical residential installation covers a keyed entry door knob with lock paired with a single or double-cylinder deadbolt directly above it — the classic two-lock setup most Stony Brook homeowners use on their front and back entries. For older homes with thicker doors or decorative escutcheons, a mortise lock is often the more appropriate solution: one integrated unit that handles the latch, the deadbolt throw, and the exterior trim in a single robust mechanism. Our crew handles mortise lock work regularly and carries the tooling to square up or extend a mortise pocket without damaging the surrounding door stile.

Not every lock type suits every door or every household. A standard door knob with lock and key works well on interior passage doors and secondary entries, but a front entry door in a neighborhood like Setauket or Old Field — where properties sit on larger lots with less street visibility — benefits from a Grade 1 deadbolt alongside the knob, or a full mortise lock that anchors deep into the door edge. If you share keys with family members, tenants, or a cleaning service, a keypad lock door knob removes the need to rekey every time access changes: just update the code. For homeowners who want phone-based control or audit logs of who entered and when, a smart lock door knob integrates with most common home-automation platforms and still allows a physical key override.

Double lock door knob sets — where both the knob and an integrated deadbolt engage with a single key turn — are popular for apartment entries and small commercial suites because they minimize the hardware profile without sacrificing the second bolt. For retail storefronts, offices, or any commercial door that takes heavy daily use, our commercial locksmith experience guides hardware selection toward higher-cycle-rated locks with reinforced strike plates and anti-drill collars. Whatever the application, we walk you through the options, explain the trade-offs, and let you decide before we order or install anything.

The mortise lock remains one of the most secure and durable lock formats available for entry doors, and it is a core part of what we do as a full-service Stony Brook Locksmith. Older homes on Watch Hill Road and throughout the historic pockets of the Three Village area frequently have original mortise lock cases that need a cylinder upgrade, a new cam, or a full case replacement because the internal spring mechanism has finally given out after decades of use. Our technicians are experienced in sourcing compatible replacement cases and cylinders for both vintage and modern mortise formats, including the ANSI-standard sizes used in most commercial doors.

Upgrading from a cylindrical lockset to a mortise lock on a door that was never routed for one is a more involved job — it requires chiseling the mortise pocket, fitting the case, aligning the spindle height, and installing a reinforced face plate — but it produces a dramatically stronger installation. We carry the right chisels, routers, and fitting tools to do this cleanly in a single visit. If you are managing a multi-unit property near campus or running a business in the Stony Brook commercial corridor and want the durability and pick-resistance of a quality mortise lock without the disruption of a long installation window, call (631) 380-4138 — we answer every call 24/7 and can schedule around your building's hours.

Stony Brook Locksmith is a fully mobile operation — our service vehicles are stocked with cylindrical locksets, deadbolts, mortise lock hardware, keypad units, smart lock modules, and the full range of installation tooling, so we come to you rather than asking you to transport a door to a shop. That mobility matters most when timing is critical: a new tenant moves in on a Saturday evening, a break-in attempt damages a strike plate late at night, or a property manager needs four units rekeyed before a Monday showing. Our emergency locksmith response covers those situations the same way we handle a scheduled afternoon installation — trained technicians, insured work, and an exact price confirmed before we begin.

The factors that determine your final quote are straightforward: the type and grade of lock hardware selected, the complexity of the door and frame (solid wood, steel, fiberglass, or a mortise-pocket door all differ), the time of day the work is performed, and travel distance to your location. We never use vague estimates or add fees after the fact. When you call (631) 380-4138, our dispatcher walks through those variables with you and provides a firm number before dispatch. Our services cover far more than new installations — below is a representative list of what our residential, commercial, and automotive locksmith teams handle across the Stony Brook area.

Residential and commercial services we perform: mortise lock installation and case replacement, single-cylinder deadbolt installation, double-cylinder deadbolt installation, door knob lock installation and replacement, keypad lock door knob programming and setup, smart lock door knob installation and pairing, lock rekeying (single lock or master-key systems), door knob with lock and key replacement, high-security cylinder upgrades, strike plate reinforcement and relocation, door frame repair after forced entry, lock cylinder extraction after a broken key, padlock and hasp installation on outbuildings and storage units, sliding door lock and pin installation, garage side-door deadbolt installation, mail slot and pet-door security reinforcement, access control keypad installation for commercial entries, master key system design and setup for multi-unit properties, commercial mortise lock installation for storefronts and offices, panic bar and exit device installation, lock-out service with ownership verification, car lockout and slim-jim-free entry for modern vehicles, automotive key cutting and key duplication, transponder key programming, key fob replacement and shell swap, and safe lock service including combination changes.