Mortise Lock Installation & Repair

A mortise lock is a complete locking mechanism — latch, deadbolt, and strike plate all housed in a single rectangular steel case that is recessed into a routed pocket (the mortise) cut into the door edge. Unlike a cylindrical bored lock that relies on a drilled hole through the door face, the mortise lock integrates multiple functions in one body, which is why architects specified it almost universally for high-quality construction from the late 1800s through the mid-20th century. Brands like Corbin Russwin, Baldwin, and Sargent engineered these sets to last generations — and with proper care, they do. The trade-off is that service requires a technician who understands the internal cam-and-follower geometry, spindle tolerances, and the specific rose and escutcheon profiles found on antique hardware.

For Hillsborough homeowners, this matters in a very practical way. Many older doors have been trimmed, painted, and re-hung so many times that the mortise pocket dimensions are now unique to that door. A mortise lock set for an exterior door on a 1920s Mediterranean revival cannot simply be swapped out with an off-the-shelf unit without careful measurement, possible pocket modification, and finish matching. Our technicians carry calipers, a full range of mortise lock cylinders, and a curated inventory of period-appropriate trim so that repairs look original rather than patched.

Fitting a new mortise lock begins long before any chisel touches wood. We measure the door thickness, the existing backset, the spindle height, and the distance from the lock face to the cylinder centerline. On an antique Corbin Russwin mortise lock or a Baldwin mortise lock set, the internal parts — the hub, the follower, the rollback spring — are precision-machined and not interchangeable with modern commodity hardware. When a lock has seized, we diagnose whether the cause is a worn cam, a broken spring, a stripped spindle, or simply decades of paint infiltration before recommending repair versus replacement. Damage-free work is always our first objective; we use lock-specific extraction tools rather than destructive force wherever the mechanism allows.

Repair calls in Hillsborough often involve locks that have been neglected rather than truly failed. A sticky latch on a 1930s Sargent set is usually a lubrication and alignment issue; a mortise lock cylinder that turns but won't engage is often a worn cam follower that costs far less to replace than the entire case. We stock common replacement cylinders compatible with popular period profiles, and we can rekey most mortise cylinders on-site without replacing the entire lock body — protecting both the original hardware and your investment in it. If your situation is urgent, call (650) 405-3068 and we'll dispatch a technician to your address, day or night.

Being locked out of a Hillsborough estate is stressful under any circumstances — it's genuinely disorienting to stand on your own front steps unable to get inside. When a lockout happens, start with the straightforward checks: is there a secondary entrance, a side gate code, or a spare key held by a neighbor or family member? If none of those options are available, that is exactly when a 24/7 mobile emergency locksmith earns its value. Our technicians are dispatched around the clock and carry the specialized tooling needed to open mortise locks without damaging the antique door hardware that makes these homes distinctive. We verify ownership before performing any entry service — a standard professional practice that protects both you and your property.

Rekeying is one of the most requested services we perform in Hillsborough, especially after a property changes hands on one of the area's prestigious residential streets. When you rekey a mortise lock cylinder, the internal pin stack is reconfigured so that only a new key operates it — every previous key becomes useless. For a home with multiple mortise lock sets on exterior doors, we can key all cylinders to a single master key while still allowing individual keys for housekeepers or family members. We also handle situations where homeowners want to upgrade an existing mortise chassis to accept a high-security cylinder without replacing the visible antique trim — a smart approach that improves pick and bump resistance while preserving the home's original character. The factors that shape your final quote include the number of cylinders, the lock and door type, time of day, travel distance, and any specialty parts required; we confirm the exact figure before we begin.

Not every project involves antique hardware. Some Hillsborough homeowners are building new additions, replacing water-damaged doors, or looking to integrate smart lock installation into a property that still uses traditional mortise cases. Modern mortise lock sets — including commercial locksmith-grade Corbin Russwin lines and Baldwin's current architectural series — are available in finishes and profiles that complement period architecture while meeting current security standards. We also retrofit Z-Wave and Zigbee-compatible smart cylinders into existing mortise bodies, giving you keypad, app, or voice-assistant access without gutting the original lock case or altering the door leaf.

Our door lock installation service extends beyond residential work. Hillsborough's boutique office spaces, private schools, and estate guest houses often use mortise hardware for its durability and the clean, unobtrusive profile it presents on a heavy commercial door. For these properties we assess fire-rating requirements, ADA lever handle compliance, and key control needs before specifying hardware. Whether the job is a single exterior door or a full re-hardware of a multi-building estate, our mobile team arrives with the tools and inventory to complete most work in a single visit. For any project — residential or commercial — reach out at (650) 405-3068 to discuss your needs with a qualified technician who will give you an honest, up-front assessment.

It's worth being direct about something: the locksmith industry has a documented problem with predatory operators who advertise deceptively low figures and then inflate the bill once they're at your door — a practice that consumer advocates and local news outlets have repeatedly flagged in the Bay Area. The warning signs are consistent: no physical address, a generic business name that changes frequently, a technician who quotes one price by phone and a radically different price on arrival, and pressure to authorize work before showing you an itemized estimate. A professional locksmith will always confirm the exact price before touching your lock. At Burlingame Locksmith, the price we confirm before starting is the price you pay — your quote accounts for lock type, door type, time of day, travel distance, and any parts needed, with nothing added afterward. Our technicians are trained and insured, and they carry ID. If anything about a locksmith's behavior feels wrong before or during the visit, you have every right to decline service and call someone else.

Our team handles an extensive range of lock and door hardware needs for Hillsborough-area clients. Specific services include: mortise lock installation on new and existing doors; mortise lock repair for seized, broken, or worn mechanisms; mortise lock cylinder rekeying to new keys; mortise lock set replacement on exterior and interior doors; Baldwin mortise lock fitting and service; Corbin Russwin mortise lock repair and parts sourcing; high-security cylinder upgrades within existing mortise cases; master key system design and implementation; smart lock installation compatible with mortise chassis; emergency lockout response for residential properties; emergency lockout response for commercial and estate properties; door lock installation on new construction additions; door knob lock replacement and upgrade; deadbolt installation alongside or in place of existing mortise sets; antique escutcheon and rose matching for period homes; mortise pocket routing and sizing on warped or trimmed doors; strike plate reinforcement and anti-kick hardware; lock lubrication and preventive maintenance; key duplication for mortise lock profiles including restricted keyways; cam and follower replacement on period mechanism bodies; spindle and hub replacement for stripped or worn interior parts; rollback spring repair and replacement; lever handle and knob set alignment on mortise chassis; commercial locksmith services for estate outbuildings and offices; and access control hardware consultation for multi-door properties.