Non-destructive entry first, always - and we re-key Schlage, Kwikset, and Baldwin locks on the spot while you watch
You get a price before we start. It does not change when we arrive. No surprises.
Fast, Reliable Change Door Locks Across South San Francisco
Changing door locks in South San Francisco usually costs between $95 and $260 per lock for standard residential hardware, and most jobs are finished the same day. That range covers the lock itself, installation labor, and rekeying if you want a single key to work everything. The real questions here aren’t about speed. They’re about whether your 1950s door will accept a modern lock without custom work, and whether the salt-laden fog rolling off San Bruno Mountain has already seized the cylinder you’re trying to replace. Call (910) 714-4287 and we’ll walk through what your door actually needs before anyone shows up.
Our Change Door Locks team works these hillside streets every week. We know that a Sunshine Gardens deadbolt from 1952 does not behave like one installed in a Daly City condo last year. That local knowledge is the difference between a clean swap and a frustrating afternoon of misaligned strike plates and snapped keys.
Why Dunmore Locksmith Is South San Francisco’s Preferred Change Door Locks Company
We’re part of Threshold Group, the locksmith family that’s been serving customers since 2007. That matters here because South San Francisco’s housing stock throws problems at you that newer construction simply doesn’t. A technician who has only worked newer Peninsula developments will struggle with a warped stile on a 1948 Paradise Valley tract home. Ours don’t, because they see these doors constantly.
The threshold standard is the part we want every South San Francisco homeowner to know about before we ever touch a lock. Every technician is background-checked and identity-verified. You get their name and photo before they arrive. They show up in a clean marked uniform carrying a photo ID badge, and they present that badge at the door before you open it. If someone arrives who you were not told to expect, that visit is covered at no charge. No exceptions, no fine print. Dunmore comes from old words for a great fort: a stronghold built to keep what is inside safe. That’s the standard, not a marketing slogan.
We answer our phone with a live person 24 hours a day, every day of the year. Not a voicemail tree. Not a chatbot. When you call (910) 714-4287 at 2 a.m. because a cylinder finally seized and your key snapped off in the deadbolt, a real human picks up.
Door Lock Installation in South San Francisco
Door Lock Installation in South San Francisco typically runs $140 to $260 per door when we’re replacing an existing lock with new hardware, including rekeying the new cylinder so one key operates everything. The job involves removing the old knob or deadbolt, checking whether the existing bore holes and faceplate align with the new hardware, and making adjustments when they don’t. In homes built between 1940 and 1965, they often don’t.
Hardware replacement on original doors
A 1951 exterior door in Sunshine Gardens has almost certainly warped. The wood swells and shifts over seven decades, and the salt air accelerates that movement at the edges. A new Schlage deadbolt does not simply drop into a hole that was drilled when Truman was in office. We frequently relocate the strike plate, mortise the frame slightly, or adjust the bolt throw so the lock actually throws fully.
Single-cylinder deadbolt upgrades
Many South San Francisco homes still carry the original single-cylinder deadbolts they were built with. These are not inherently unsafe, but most are decades past their service life, and the salt fog here has usually corroded the internal pins. When you’re ready to upgrade, we typically install an ANSI Grade 1 deadbolt from Schlage or Kwikset, rekeyed to match your existing knob so you’re not juggling two keys. The full price is quoted on paper before we start, and it’s the price on the invoice. No call-out surcharge added on arrival.
Patio Door Lock Change in South San Francisco
Patio Door Lock Change in South San Francisco is one of the most common calls we get from Paradise Valley and Sunshine Gardens homeowners whose original sliding doors are still in service. Expect to pay between $110 and $220 for a mortise-style patio lock replacement on a sliding glass door. The work usually means removing the old surface mount or mortise latch, fitting a compatible replacement, and adjusting the door so the latch actually engages the striker without forcing it.
Sliding door latch replacement
Older aluminum slider frames corrode badly in this marine air. The latch mechanism seizes, the keyway fills with salt residue, and one day the key simply won’t turn. We stock replacement patio locks locally for the common older builders who supplied South San Francisco’s tract developments, which means faster turnaround than shipping from a warehouse.
Secondary patio deadlock upgrades
Most sliding doors from the 1950s and 1960s have only a thumb latch, which is adequate for keeping the door closed but not for keeping it secure against forced entry. We add a secondary patio deadlock that pins the sliding panel to the frame, and we rekey it to your primary house key. That second point of resistance matters more on ground-floor units and homes backing onto the Sign Hill open space.
Trusted Brands We Service in South San Francisco
We’re factory-authorized to install and service Schlage, Kwikset, Medeco, Yale, Baldwin, Mul-T-Lock, and Sargent hardware. For most South San Francisco residential work, Schlage and Kwikset are the workhorses: available, reliable, and easy to rekey when a tenant turns over or a roommate moves out. For homeowners who want restricted keyways that can’t be duplicated at a hardware store, we install Medeco and Mul-T-Lock high-security cylinders. We keep common replacement parts stocked locally, so a Schlage B60 deadbolt or a Kwikset knob set usually leaves the shop the same day.
Common Change Door Locks Problems We See in South San Francisco Homes
- Salt-seized deadbolt cylinders: The marine air pulled through the San Bruno Mountain funnel coats exposed hardware with salt. On original single-cylinder deadbolts from the 1940s and 1950s, that salt works into the pin chambers and welds the pins in place. Standard rekey attempts on these locks snap keys instead of turning pins.
- Warped original doors: Post-WWII tract home doors in Sunshine Gardens and Paradise Valley have had seventy-plus years to swell, twist, and sag. A new deadbolt or knob set will frequently not align with the existing strike plate without relocating or mortising the frame.
- Obsolete mortise locks and cylinders: Pre-1960 homes often have mortise lock bodies whose face bore and backset don’t match any modern hardware. Off-the-shelf locks cannot drop in. They need a locksmith who can either service the existing mortise body or adapt the door to accept a modern cylinder.
- Corroded garage and side-gate hardware: Exposed padlocks, gate latches, and garage side-door hardware take the full brunt of the salt fog. We see these seize solid years before interior hardware shows any wear at all.
Pricing for Change Door Locks in South San Francisco, CA
Here’s what you can honestly expect to pay in South San Francisco. A standard knob or deadbolt replacement runs $140 to $260 per door, including rekeying to a single key. A patio door lock change runs $110 to $220. Rekeying an existing lock, where the hardware is in good condition, runs $25 to $45 per cylinder for the labor plus the cost of new pins. Every quote is delivered in writing before any work begins, and that written price is the price on the invoice. We don’t add dispatch fees, fuel surcharges, or ‘arrival fees’ when the technician pulls up. Call (910) 714-4287 for an exact quote. Estimates are free.
We Also Serve Cities Near South San Francisco
Our Change Door Locks in South San Francisco service area reaches into the surrounding Peninsula communities. We regularly run calls in Brisbane, Daly City, San Bruno, and Millbrae. The housing stock and weather patterns are similar, which means the lock problems are too. Same crews, same pricing, same written guarantees.
Serving South San Francisco, CA - Our Local Coverage Area
We’re based in the South San Francisco area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Change Door Locks in South San Francisco
Yes, in most cases we can rekey a 1950s mortise lock without replacing the door or even the lock body. The mortise cylinder comes out, we replace the internal pins so the old keys no longer work, and we cut new keys on the spot for $25 to $45 per cylinder. If the mortise body itself has failed, which we see often in salt-exposed exteriors, we’ll tell you plainly, and we can usually fit a modern deadbolt above it rather than replacing the entire door. Call (910) 714-4287 and we’ll tell you which situation you’re in before scheduling anything.
Yes, it’s genuinely normal in South San Francisco, because this city sits in a natural wind and fog funnel that pushes salt-laden marine air through at higher velocities than most Peninsula towns. The salt settles inside the keyway and pin chambers, corrodes the pins, and one morning the key won’t turn. Regular lubrication with a dry graphite or Teflon spray helps, but once the cylinder is seized solid, we typically replace the cylinder and rekey it rather than fighting the old one. Call (910) 714-4287 and we’ll get you on the schedule.
If the existing hardware is in good mechanical shape, rekeying is the right move. We change the internal pins so all previous keys are dead, and cut new keys for you and the tenant. That runs $25 to $45 per cylinder. If the hardware is original, corroded, or the deadbolt is single-cylinder and decades old, we recommend replacing it with a new Schlage or Kwikset set, which includes rekeying. The written quote shows both options, and the price we give you on the phone is the price on the invoice. Call (910) 714-4287 for your options on that specific door.
Yes. Most Paradise Valley sliding doors from the 1950s and 1960s use a mortise latch mounted in the edge of the sliding panel. We remove the old latch, match the replacement to the existing mortise pocket, and adjust the door so the latch seats properly. If the frame has warped, which is common with these older aluminum sliders, we adjust the rollers or strike position rather than forcing the new lock into a misaligned track.
It does, and this is the biggest variable on a job here. A lock that looks fine on the outside may have its pins welded solid from years of salt exposure, especially on exterior garage and side-gate hardware. When we open the cylinder and the pins are frozen, rekeying is not possible, and the honest fix is a new cylinder or a new lock. We’ll show you the old cylinder, explain what we found, and give you the replacement price in writing before we proceed. Call (910) 714-4287 for a free estimate on what your doors actually need.
Written by Perry Osgood, Owner at Dunmore Locksmith, serving South San Francisco as part of the Threshold Group family of independent local locksmith businesses.