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 Door Lock Repair Across San Francisco
A door lock that sticks, seizes, or snaps a key inside is more than frustrating – in San Francisco, it’s often a sign that salt air and damp have been working on your hardware for years. We repair, rekey, and replace locks across the city every day, from the Outer Richmond to Bayview. Our crews know which cylinders fail first near the ocean and which mortise mechanisms are worth saving in a 1912 Edwardian. Call (910) 714-4287 and a live person answers – we’ll give you a written price before anyone is dispatched, and the price on the invoice is what you approved on the phone.
Why Dunmore Locksmith Is San Francisco’s Preferred Door Lock Repair Company
Dunmore Locksmith has served San Francisco as part of the Threshold Group since 2007, and the name carries its own logic: Dunmore comes from old words for a great fort, a stronghold built to keep what is inside safe. That’s the standard we bring to every repair and every customer who opens the door to a stranger. Our technicians are background-checked, identity-verified, and sent to you by name and photo before the visit. They arrive in clean marked uniforms and show a photo ID badge at the door. If the person standing there isn’t who we said it would be, that visit is covered at no charge. That’s The Threshold Standard, and it’s the reason San Francisco homeowners who worry about who they’re letting in tend to stay with us.
Every repair is covered by the 365-Day Done Right Promise – a written guarantee included on every job. If the repair fails within a year, we return and make it right at no charge. Our phones are answered by a live person 24 hours a day, every day of the year, not a voicemail and not a chatbot. And because we’re built around written pricing, you know the full cost before we arrive. That’s how Door Lock Repair should work, and it’s how ours does.
Door Knob Lock Repair in San Francisco
Door knob lock repair in San Francisco typically means a tired, loose, or frozen knob on a door that has been swelling and contracting with the marine layer for decades. The knob cylinder itself often fails first – salt-laden fog works into the pin chambers and corrodes the internal springs until the key won’t turn cleanly or the knob spins without engaging the latch. We disassemble, clean, and re-lubricate what’s salvageable, then rekey the cylinder so the lock works as new. When the internal parts are too far gone, we replace the knob assembly entirely, usually with Schlage or Kwikset hardware rated for coastal conditions. A standard door knob lock repair in San Francisco runs $85 to $165. Rekeying a knob lock in this market typically adds $25 to $45 per cylinder. If the knob has pulled loose from the door from years of use, expect $120 to $190 to address the internal chassis and strike alignment in the same visit.
Loose or Wobbling Knobs
A knob that sags, jiggles, or no longer latches has usually worn down the internal spindle or loosened the chassis screws behind the rose plate. In San Francisco’s older flats and single-family homes, we also see knobs that were installed decades ago with the wrong backset for the door thickness. We tighten, shim, or replace the internal hardware and then check the strike plate on the jamb. If the door has settled even a quarter inch, the bolt won’t seat, and the lock will fail again no matter how new the knob is.
Stiff Keys and Hard-to-Turn Knobs
When a key slides in but the knob resists, the cylinder pins are gunked or the tailpiece is binding. Coastal fog accelerates this dramatically – a cylinder that would work for a decade in Sacramento can seize in five to seven years in the Outer Sunset. We clean and repack the cylinder, lubricate with a dry film so it doesn’t attract more grit, and when needed we rekey to fresh pins. Most of these jobs take under an hour on site.
Broken Key Extractor in San Francisco
Broken key extractor work in San Francisco is a regular call for us, and the pattern usually goes like this: an older key – often a skeleton key from a period mortise lock or a badly worn Kwikset copy – snaps off inside the cylinder. The key has been fatigued by years of salt-air corrosion at the blade, and one morning it gives way just as the door needs to open. We extract the broken key with non-destructive tools designed to grip the bow or bite, then inspect the cylinder for damage. In most cases the lock itself is fine and we simply cut a new key or rekey the cylinder on the spot. Broken key extraction in San Francisco typically runs $75 to $130, which includes a fresh key cut to code or a duplicate from the surviving piece. If the cylinder is too corroded to salvage after extraction, a new cylinder with rekey runs $95 to $175 installed.
Non-Destructive Extraction
Our first move is always to pull the broken piece out without drilling or replacing the lock. We use broken-key extractor picks and custom notched tools that slip alongside the snapped blade and hook it out. This works on the majority of residential knob and deadbolt cylinders we see in San Francisco, even on corroded marine-air locks. Only if the cylinder is completely seized or the break is buried beyond reach do we move to drilling, and we always tell you the moment that becomes necessary.
When the Key Snaps in a Mortise Lock
Skeleton keys and lever-style keys snap less often than modern flat keys, but when they do, extraction is more delicate because the mortise mechanism holds the piece under spring tension. Force turns a broken key into a damaged gearbox. We work these carefully, and if the mechanism has already been grinding from corroded internals, we’ll show you what that means: repair parts are available for many pre-1930s mortise bodies, and where they aren’t, we fit a period-appropriate replacement rather than hacking the door to fit a modern deadbolt.
Trusted Brands We Service in San Francisco
We’re factory-authorized to install and service Schlage, Medeco, Yale, and Kwikset hardware, and we stock the common cylinders, tailpieces, and strike plates for those brands so we can complete most San Francisco repairs in one visit. For Victorians and Edwardians with original mortise locks, we keep lever-tumbler springs, case plates, and skeleton-key blanks on hand. If you have a Medeco or Yale high-security cylinder, we rekey it to factory spec rather than installing a soft replacement. Fast turnaround matters out here, and having the right parts in the truck is the difference between a thirty-minute repair and another trip back across the city.
Common Door Lock Repair Problems We See in San Francisco Homes
- Seized coastal cylinders. Salt-laden fog from the Pacific works into the pin chambers and corrodes the springs from the inside. A cylinder that should last fifteen years can fail in five to seven on west-facing doors in the Outer Sunset or Ocean Beach.
- Swollen door jambs on Victorians. The chronic damp swells the old-growth redwood and fir framing around door openings, shifting the door enough that a deadbolt won’t throw or binds mid-turn. We realign the strike and trim the jamb where needed, then fit marine-grade stainless hardware that resists the moisture.
- Worn mortise lock internals. Pre-1930s mortise cases in buildings across the Mission, Castro, and Haight were built to last, but their springs and levers eventually fatigue. Improper repair can crack the case or destroy the skeleton-key mechanism, so we service what’s there rather than replacing it with something that doesn’t fit the door.
- Dead police plate and strike corrosion. The bolt itself pits and the strike plate rusts, so the deadbolt jams even when the key turns fine. We replace the strike with stainless and service the bolt assembly, which resolves most sticking before it becomes a lockout at midnight.
Pricing for Door Lock Repair in San Francisco, CA
What does door lock repair actually cost in San Francisco? Here’s the honest range. A standard knob lock repair runs $85 to $165. Rekeying runs $25 to $45 per cylinder. Broken key extraction runs $75 to $130, including a new key. Mortise lock repair on a Victorian or Edwardian run $140 to $260 depending on the mechanism. Fit a new deadbolt with installation: $120 to $210 for standard hardware, more for Medeco or Yale high-security. The full price is quoted on the phone before anyone is dispatched, and it is the price on the invoice. We don’t add a call-out surcharge when the tech arrives. Call (910) 714-4287 for an exact quote – estimates are free, and the number is answered by a live person any hour.
We Also Serve Cities Near San Francisco
While this page covers San Francisco in depth, our crews also serve Daly City, Brisbane, Sausalito, and South San Francisco – each with its own mix of housing stock and moisture patterns, which we adjust for. If you’re in one of those cities, we bring the same written pricing, named-technician arrival, and 365-day guarantee.
Serving San Francisco, CA - Our Local Coverage Area
We’re based in the 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 Door Lock Repair in San Francisco
San Francisco’s marine layer delivers a steady salt-laden fog to west-facing neighborhoods like the Outer Sunset, Ocean Beach, and the Richmond, and that salt works its way into the cylinder’s pin chambers where it corrodes springs and pins from the inside. Locks that would last fifteen years in Sacramento or Fresno can seize within five to seven years here. The fix is regular cleaning with dry-film lubricant and, when replacing, fitting marine-grade stainless hardware. Call (910) 714-4287 and we’ll tell you whether yours can be revived or should be replaced.
Yes, in most cases. The mortise case in a pre-1930s Victorian flat in San Francisco was built as a serviceable mechanism, not a disposable one. We clean, repair, and re-lever mortise internals, rekey the cylinder, and replace worn strike plates. Full replacement only happens when the case itself is cracked or so corroded that the gear teeth have failed, and we’ll always show you the damage before recommending that step.
San Francisco’s Rent Ordinance makes lock changes on occupied rent-controlled units a legal minefield. A landlord-ordered change without proper notice and coordination can trigger an illegal-lockout complaint with the city’s Rent Board. That’s why our technicians ask documentation questions before changing locks on a multi-unit building in neighborhoods like the Mission, Castro, or Haight – questions a locksmith in Daly City or Walnut Creek would never think to raise. We coordinate with all tenants and make sure the change follows San Francisco’s rules.
The marine layer corrodes battery contacts, keypad membranes, and the motorized bolt assemblies inside smart locks far faster than inland air does. We’ve seen keypad entry systems fail within three years on doors facing the Pacific. When we install smart locks in San Francisco, we specify models with sealed keypads and marine-rated internal components, and we recommend a schedule of cleaning and battery replacement that matches the local climate. Call us at (910) 714-4287 and we’ll tell you exactly what fits your building.
Yes, and it’s our first approach on every broken key call. We use extraction picks and notched tools to pull the broken piece from the cylinder without drilling, and that works on the majority of residential locks in San Francisco. If the cylinder is so corroded that the pins have seized around the broken blade, drilling is the last resort – we’ll tell you before we do it, and we’ll replace the cylinder that same visit. For a fast quote, call (910) 714-4287.
Call Dunmore Locksmith for Door Lock Repair in San Francisco
We recently repaired a seized mortise lock on a Victorian flat in the Mission District. The original skeleton-key mechanism had corroded from years of marine-layer fog, and the deadbolt was binding because the door jamb had swelled. After rekeying the cylinder and fitting marine-grade stainless strike plates, we coordinated with all tenants to avoid any illegal lockout issue under San Francisco’s Rent Ordinance. That’s the work this city requires, and it’s what we do every day. Call (910) 714-4287 now for a free estimate and a written price before anyone leaves the shop.
Written by Perry Osgood, Owner at Dunmore Locksmith, serving San Francisco since 2007.