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 Commercial Locksmith Across Monrovia
Commercial locksmith work in Monrovia means something different than it does down in the flatlands. The city climbs straight into the San Gabriel foothills, and the housing stock north of Huntington Drive is old, dense, and full of pre-WWII doors with mortise-box locks you can’t retrofit with off-the-shelf hardware. That’s the work we actually do here. From Old Town storefronts to four-plexes off Myrtle Avenue, our Commercial Locksmith team handles master key systems, non-destructive entry, high-security cylinders, and panic bar installation across Monrovia. If you need a lock repaired, a tenant let back in, or a key control plan for a multi-unit building, call us at (910) 714-4287 and you’ll get a live person, a written price before any work starts, and a technician sent to you by name and photo.
Why Dunmore Locksmith Is Monrovia’s Preferred Commercial Locksmith Company
Dunmore comes from old words for a great fort, a stronghold built to keep what is inside safe. That’s the idea behind how we work in Monrovia, and the reason property owners call us when key control matters. Since 2007, we’ve operated as part of the Threshold Group family, which means every technician who arrives at your door in Monrovia has been background-checked, identity-verified, photo-badged, and sent to you by name and photo before the visit. That’s the Threshold Standard, and it’s not optional. If someone shows up who you weren’t told to expect, that visit is covered at no charge. You’ll know exactly who is walking up to your building before you turn the handle.
Our response time to Monrovia neighborhoods is fast because crews are staged locally and dispatch runs through the brand’s Los Angeles office. We know the difference between a Bradoaks Craftsman and a mid-century ranch up on Norumbega. We know that a four-plex on Canyon Oaks Drive has different lock needs than a retail space near the Monrovia Train Depot. That local familiarity means we quote the right repair the first time, not a generic lock swap that fails the next time Santa Ana winds shift a door jamb.
Master Key System in Monrovia
A Master Key System in Monrovia is how a landlord, property manager, or small business owner gets real control over who can open which door. Instead of every tenant holding a cylinder key that works on every lock in the building, each unit gets its own change key that opens only that unit, while you carry a single master key that opens all of them. For a multi-unit building near Old Town Monrovia, a master key system typically runs $450 to $900, depending on the number of cylinders and whether we’re working with existing hardware or replacing cores. We design the key chart, cut and pin the cylinders, and hand you a written schedule of which key opens what so there’s no guesswork.
Key control for multi-tenant buildings
The real problem in older Monrovia complexes is key drift. A tenant moves out, hands a copy to a friend, the friend keeps it, and now you have four working keys floating around that you don’t know about. Rekeying every unit solves it. We rekey each cylinder to its own key, cut fresh change keys, and from that day forward, not one old key will turn any lock in the building. If you ever need to add a unit or fire a vendor, we change one cylinder instead of rekeying the whole property.
Restricted and high-security keyways
For larger buildings or anyone who’s been burned by copied keys, we recommend restricted keyways from Medeco or Mul-T-Lock. These keys can’t legally be duplicated at a hardware store because blanks are only sold to authorized locksmiths. Every copy is logged and requires your written authorization. In a building where a copied key is a building-wide problem, this ends the problem permanently. A restricted master key system in Monrovia starts around $800 and goes up from there based on cylinder count and hardware grade.
Mortise Lock Replacement in Monrovia
Mortise Lock Replacement in Monrovia is the standard call for anyone who owns or manages a pre-WWII building north of Huntington Drive. The city’s Craftsman bungalows and Spanish Colonial Revival homes, especially in the historic districts around Old Town, were built when mortise locks were standard. These locks are rectangular steel cases mortised into the edge of the door, completely different from modern cylindrical deadbolts. When a mortise lock fails, you can’t just drill a bigger hole and drop in a Kwikset. The mortise case has to be pulled, the backset and faceplate measured, and a compatible replacement sourced, often with a new cylinder matched to your existing keying. In Monrovia, a standard mortise lock replacement runs $280 to $500, and if we’re matching a specialty finish or a high-security cylinder, that climbs to $600 or more.
Original hardware and historic doors
Plenty of Monrovia owners want to keep their original Baldwin or Yale mortise lock but the internal springs have given out. We strip the case, replace the springs and levers, lubricate the mechanism, and put the same hardware back in the door. That costs less than a full replacement, usually $160 to $300, and keeps the door looking exactly like it has for eighty years. If the hardware is too far gone, we’ll source a period-compatible replacement so the new lock fits the door and the house.
Smart-lock retrofits that actually fit
Most smart-lock conversion kits assume a standard 2-1/8 inch cylindrical bore. Most Monrovia mortise doors don’t have one. Forcing a smart-lock kit onto an original Craftsman mortise lock usually means hacking up the door, wrecking the mortise case, and leaving a gaping hole the owner has to pay to fix. We do these retrofits properly by pulling the mortise case, matching the backset and faceplate, and installing a compatible modern cylinder that gives you keypad or smart-lock function without destroying the door. That work runs $350 to $650 depending on the hardware you choose.
Trusted Brands We Service in Monrovia
We’re factory-authorized to install and service hardware from Schlage, Kwikset, Medeco, Yale, Baldwin, Mul-T-Lock, Sargent, and Abloy. For Monrovia’s older housing stock, the names that come up most are Baldwin and Yale, the two brands found on most original Craftsman mortise locks built between 1920 and 1950. We stock common replacement parts and cylinders for those lines locally, which means faster turnaround for Monrovia customers. When your Baldwin mortise lock needs a new cylinder or a Kwikset deadbolt on a back door needs rekeying to match a new master key, we don’t have to order parts and make you wait a week.
Common Commercial Locksmith Problems We See in Monrovia Homes
- Original mortise locks that no standard smart-lock kit will fit. The pre-WWII Craftsman bungalows north of Huntington Drive still carry mortise-box cases and skeleton-key entry systems. Retrofitting requires pulling the case and matching the backset and faceplate, not swapping a deadbolt.
- Santa Ana wind shift causing deadbolts to bind. Strong wind events funnel down the canyons directly above Monrovia and can shift wooden door frames on older homes enough that deadbolts bind or strike plates misalign overnight. The fix is usually realigning the strike plate, not replacing the lock.
- Seasonal jamb movement on older wood doors. The hot, dry inland climate makes wooden jambs on Monrovia’s older homes shrink and swell through the year. A deadbolt that worked in June may bind in October because the jamb moved.
- Lockouts after wildfire evacuation orders. The Bobcat Fire in 2020 burned through the mountains directly above Monrovia, and residents who evacuated quickly often returned to locked-out homes with spare keys handed to neighbors or fire crews. Repeated evacuation orders have made keypad retrofits and non-destructive entry a regular call for foothill homes.
Pricing for Commercial Locksmith in Monrovia, CA
Here are honest ranges for the work we do most often in Monrovia. A standard rekey, changing the internal pins so old keys no longer work, runs $95 to $160 for a single cylinder and $25 to $45 per additional cylinder. Commercial lockout service, getting someone back in without damaging the door, runs $75 to $150 depending on time of day and lock type. Master key system design and installation runs $450 to $900 for a typical four-plex. Mortise lock replacement, which is common in Monrovia’s historic bungalows, runs $280 to $500. High-security cylinder upgrades from Medeco or Mul-T-Lock run $150 to $300 per cylinder installed. Panic bar installation runs $350 to $700 per door including hardware. Every job gets a written price before any work starts. That price is the price on the invoice. No call-out surcharge added on arrival. Call (910) 714-4287 for a free estimate and we’ll quote the full number on the phone before anyone is dispatched.
We Also Serve Cities Near Monrovia
Our Commercial Locksmith service covers Monrovia and the neighboring communities along the 210 corridor. If your building sits in Arcadia, Duarte, Sierra Madre, or Baldwin Park, the same written pricing, background-checked technicians, and 365-Day Done Right Promise apply. Call (910) 714-4287 and a live person will schedule your visit, no matter which side of the foothills you’re on.
Serving Monrovia, CA - Our Local Coverage Area
We’re based in the Monrovia 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 Commercial Locksmith in Monrovia
Yes. The mortise lock and the deadbolt are separate cylinders, so we can pin both of them to the same master key system even if they’re different brands and different vintages. We’ll design a key chart where each unit key opens only that unit’s mortise and deadbolt, while your master key opens all of them. This is standard work on Monrovia’s older multi-unit buildings. Call (910) 714-4287 for a specific design and a written quote.
The winds funnel down the canyons above Monrovia and shift the wooden door frame just enough that the strike plate no longer lines up with the deadbolt bolt. On older homes with dried-out jamb wood, this happens seasonally. The fix is realigning and shimming the strike plate, and sometimes tightening the hinge screws, not replacing the deadbolt. If the jamb is severely warped, we’ll discuss a strike plate reinforcement kit. Call us at (910) 714-4287 and we’ll diagnose it on-site.
Yes. Non-destructive entry is our default on any multi-tenant door, because the door and the frame belong to the owner, and the owner doesn’t want to pay for a new door because someone lost a key. We pick the lock or use a bypass tool, get the tenant inside, and then handle the rekey if needed. After an evacuation, we also usually talk to the landlord about master key control and a keypad retrofit so spare keys stop getting handed out before the next red-flag warning. Call (910) 714-4287 and a live person will dispatch a technician to Monrovia right away.
Usually not without a proper retrofit. Most keypad latches and smart-lock kits are built for a standard cylindrical bore, and most original Craftsman front doors in Monrovia have mortise boxes instead. Forcing the kit on damages the door and the mortise case. The right retrofit pulls the mortise case, matches the backset and faceplate, and installs a compatible modern cylinder that gives you keypad function without hurting the door. That work runs $350 to $650 in Monrovia. Call (910) 714-4287 for a free assessment.
Rekeying changes the internal pins inside the existing cylinder so the old keys no longer work. The lock hardware stays on the door. Replacing means removing the old lock, mortise case, or deadbolt and installing new hardware. In Monrovia, rekeying a single cylinder runs $95 to $160, while replacing a mortise lock runs $280 to $500. Rekeying is faster and cheaper and makes sense whenever the existing hardware is in good condition. Call (910) 714-4287 and we’ll tell you which option fits your door and your budget.
A landlord managing a four-plex on Canyon Oaks Drive near Monrovia Canyon Park called after an evacuation order lifted. A returning tenant was locked out and the building’s shared mortise entry had a warped strike plate that no longer lined up. We did a non-destructive entry to get the tenant inside, then rekeyed the master cylinder and installed a bump-resistant pin and tumbler core so the landlord could finally enforce real key control across all four units. Six weeks later we retrofitted a keypad entry at the common door so no one has to hand out spares before the next red-flag warning. That’s the kind of work we do in Monrovia every week.
Call (910) 714-4287 for a free estimate on any commercial locksmith work in Monrovia. A live person answers, the price goes in writing before work starts, and the technician who shows up is the one whose name and photo you already have.
Written by Perry Osgood, Owner at Dunmore Locksmith, serving Monrovia and the San Gabriel Valley foothills.