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 San Mateo
Changing door locks in San Mateo typically runs $95 – $285 for a standard knob or deadbolt swap, including the new hardware, and most jobs in Baywood, Beresford, Shoreview, or Beachpark are completed the same day we take your call. If you’re dealing with a seized cylinder, a lost key, or a lock that’s simply past its service life, we’ll give you a written price before any work starts, then send a background-checked, photo-badged technician to your door. This is not a generic locksmith call in San Mateo: the city’s mix of corroded Bay-side hardware, 1940s – 1960s tract-home lock generations, and Caltrain-corridor smart-lock upgrades means a change of door locks here often starts with a diagnosis, not just a drill. Call (910) 714-4287 for a free estimate and a no-surprise price in writing.
Why Dunmore Locksmith Is San Mateo’s Preferred Change Door Locks Company
Dunmore comes from old words for a great fort, a stronghold built to keep what is inside safe. That’s the approach we take on every lock change in San Mateo. Since 2007, we’ve worked as the Threshold Group member business serving San Mateo homeowners and small commercial properties, and every technician we send is background-checked, identity-verified, uniformed, and personally introduced to you by name and photo before the visit. When the tech rings your doorbell in Shoreview or Beresford, they show a photo ID badge at the door. If anyone arrives who you were not told to expect, that visit is covered at no charge. That’s the Threshold Standard, and it matters more in San Mateo than most places: many of our customers work at Peninsula tech firms, commute via the Caltrain station, and simply will not open the door to an unverified stranger.
We answer our phones with a live person 24 hours a day, every day of the year, including the night you get home from SFO and find your key won’t turn. And our Change Door Locks team quotes the full price on the phone before anyone is dispatched. That price is the price on your invoice. No call-out surcharge added on arrival, no after-the-fact total. Perry Osgood, who leads Dunmore Locksmith, built the operation around one rule: you should know exactly who is coming to your door before you open it.
Patio Door Lock Change in San Mateo
Patio Door Lock Change in San Mateo is a specialty we field at least once a week, particularly in Shoreview and Beachpark, where salt-laden marine air from San Francisco Bay accelerates corrosion on brass and zinc patio-lock bodies and causes latches to fail well before their rated life. A typical patio door lock change in San Mateo runs $120 – $240 depending on whether you’re replacing a surface-mounted latch, a flush bolt, or a full mortise-style patio lock on a sliding or French door. On postwar tract homes here, the patio slider often still runs its original 1970s latch, which means the existing screw holes are stripped or the keeper is loose enough that the door doesn’t actually secure.
Sliding and French Door Lock Replacement
We see two distinct patio-lock failings in San Mateo: the sliding-door claw latch that no longer grabs the keeper, and the French-door mortise bolt that binds in fog-season corrosion. Both are replacements, not repairs, when the internal spring or pin stack has pitted. On most Shoreview jobs we can reuse the existing mortise pocket with a modern Schlage or Baldwin patio bolt, which keeps the door face clean and avoids patching the wood.
One Keyway for the Patio, Front, and Side Doors
If you’re tired of juggling three separate keys for three doors, that’s a fix we do constantly in the mid-century neighborhoods. We convert each patio lock, knob set, or deadbolt to a common keyway during the change, so one key works every exterior door on the property. For tech-commuting homeowners around the Caltrain corridor, we also match the patio lock to Kwikset or Yale smart-key platforms so a single app can monitor and control every entry point.
Door Lock Change in San Mateo
Door Lock Change in San Mateo usually means one of three situations: a lost or copied key, a lock that’s grinding or sticking from Bay-air corrosion, or an older knob set and deadbolt that need to be unified under a new keyway. Standard door lock change in San Mateo runs $95 – $185 for a straightforward knob or deadbolt swap in the Beresford and Baywood areas, and $180 – $285 when the job involves freeing a seized cylinder, reinforcing a worn strike plate, or retrofitting a mortise lock on a pre-war Craftsman bungalow near downtown. We always quote the exact written price before any work starts.
Deadbolt and Knob-Lock Replacement
In the 1942 – 1968 tract homes that dominate San Mateo’s single-family stock, the original Schlage and Kwikset knob-lock sets are now 50 – 70 years old. Zinc die-cast internals crack, pin stacks seize, and tailpieces snap. When we change one of these, we install an ANSI Grade 1 deadbolt with a reinforced strike plate and hardened screws into the door frame, which is the difference between a door that holds and one that gives way on the first solid kick.
Smart Lock Retrofits on Mid-Century Doors
San Mateo’s unusually high concentration of Peninsula tech workers means a large share of our door lock changes are actually smart-lock retrofits. Homeowners want a Kwikset Halo or Yale Assure lock that integrates with an existing alarm or smart-home app. The challenge is usually the 2-1/8″ cross-bore on a 1950s door combined with a worn edge bore that won’t hold a smart lock’s larger bolt assembly. We re-bore and reinforce when needed, then hand you one app and one key for the whole property.
Trusted Brands We Service in San Mateo
We stock local parts for San Mateo customers and service the hardware already in your doors, not just what we sell. That includes Kwikset and Yale for most residential knob sets, deadbolts, and smart locks, plus Medeco and Baldwin when you want restricted, patented key control that cannot be copied at a hardware-store kiosk or big-box self-service machine. If you bought a Medeco or Baldwin set years ago and need it rekeyed or matched to a new door lock change, we keep the pinning kits and tailpieces for those lines in our Bay Area service vehicles. That means a same-day lock change in Baywood or Shoreview doesn’t have to wait on a parts order.
Common Change Door Locks Problems We See in San Mateo Homes
- Corroded pin and tumbler stacks in Shoreview and Beachpark. Salt-laden fog and persistent marine air pit brass keyways and seize pins, so a key sticks or grinds. We often save the cylinder with a non-destructive excavation of the pin stack, then rekey rather than replace the whole lock.
- Mismatched lock generations on one Baywood property. A 1950s knob set on the side door, a 1990s big-box deadbolt on the front, and a newer smart lock on the garage. No single keyway works, so homeowners assume all three need replacing. Often we unify them under one keyway or one app and replace only what’s actually failed.
- Mortise locks in pre-war downtown Craftsman bungalows. These older mortise bodies seize or crack and cannot accept a modern smart-lock retrofit without a compatible lock cylinder or a full mortise replacement. We carry retrofit mortise cylinders from Baldwin and Medeco that fit the existing pocket.
- Tall-door and multi-point locking on newer Bay Meadows-style builds. The 2010s – 2020s multi-family and mixed-use buildings near the Caltrain station often use multi-point or electronic access hardware that needs a different skill set and calibration after a lock change. We service fob and access control systems and integrate them with the existing alarm or smart-home setup.
Pricing for Change Door Locks in San Mateo, CA
Here are the honest ranges for the San Mateo market. A standard knob-lock or deadbolt change runs $95 – $185 including the new hardware. A patio door lock change runs $120 – $240. Rekeying a standard knob lock to new keys runs $65 – $120, while rekeying plus a new deadbolt and strike-plate reinforcement runs $160 – $260. If we have to free a corroded pin stack first, add $40 – $80 for the labor, but we’ll tell you before we start. High-security keys from Medeco or Baldwin run $25 – $55 per key cut. Everything is quoted in writing before the work begins, and that quote is the final invoice. No call-out fee tacked on when the truck arrives. Call (910) 714-4287 for an exact quote, free.
We Also Serve Cities Near San Mateo
Dunmore Locksmith handles lock changes throughout the mid-Peninsula, including San Mateo‘s neighboring cities. We run regular routes through Burlingame, Belmont, Millbrae, and San Carlos, which means those communities get the same background-checked, photo-badged technicians, the same written pricing, and the same 365-Day Done Right Promise. Dispatch and scheduling are coordinated from our San Francisco Bay Area office, and crews serve San Mateo locally every day.
Serving San Mateo, CA - Our Local Coverage Area
We’re based in the San Mateo 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 San Mateo
You can rekey most 1950s Schlage and Kwikset knob-lock sets in San Mateo for $65 – $120 per lock, as long as the internal pin stack and tailpiece are not corroded or cracked. We’ll inspect first and tell you honestly: if the zinc die-cast body is pitted from Bay air, replacement is cheaper than repeated repairs from Shoreview to Beresford. Call (910) 714-4287 and we’ll tell you over the phone which option fits, and give a written price before any work starts.
Yes, we rekey most Kwikset and Yale smart locks to the same pinning as an existing deadbolt, so one key works both. In San Mateo’s postwar tract homes, we also often rekey the side-door knob set to the same keyway at the same visit, which unifies three generations of hardware under one key and one app. We’ll show you the written quote for all of it before we begin.
In Shoreview, Beachpark, and other low-lying Bay-side neighborhoods, salt-laden marine air corrodes the brass keyway and zinc die-cast lock body, causing pins to seize and deadbolts to bind. That grinding is the pin stack fighting you. We can often free it with a non-destructive pin and tumbler excavation and rekey, but if the cylinder is pitted, we’ll replace the cylinder or the whole deadbolt. Call (910) 714-4287 and describe the feel; we’ll tell you what we’re likely to find and what it will cost.
Most pre-war downtown Craftsman mortise locks in San Mateo cannot accept a standard smart lock without a compatible mortise cylinder retrofit, which we do carry from Baldwin and Medeco. The alternative is a full mortise replacement with a modern mortise body that accepts electronic trim. Either way, we’ll survey the door, give you a written flat-per-lock price, and schedule a proper installation; we don’t dispatch a drill to a mortise door.
Not necessarily. On a standard pin-tumbler knob set or deadbolt from a 1950s tract home, we usually open it with a non-destructive pin-stack release first, which saves the cylinder. Drilling is the last resort when the tailpiece has snapped or the lock body is cracked. We’ll explain the choice on-site before drilling anything, and every San Mateo lock change is covered by our 365-Day Done Right Promise: if the repair fails within a year, we return at no charge. Call (910) 714-4287 now; we’ll have a live person on the line and give you a written price before the tech leaves our Bay Area office.
Written by Perry Osgood, Owner at Dunmore Locksmith, serving San Mateo through the Threshold Group since 2007.