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 Larkspur
Commercial locksmith work in Larkspur runs about $95 to $450 for most jobs, from rekeying a single storefront cylinder to full mortise lock replacement on a Magnolia Avenue Victorian. Our crews reach Larkspur neighborhoods within about 45 minutes for urgent calls, and we stock period-appropriate hardware and fog-resistant commercial cylinders locally so one trip usually finishes the job. Larkspur’s mix of 1880s storefronts and newer commercial builds means generic hardware swaps fail fast here. Call (910) 714-4287 and a live person answers, day or night, with a written price before any work starts.
Why Dunmore Locksmith Is Larkspur’s Preferred Commercial Locksmith Company
We approach Larkspur commercial work differently because the town demands it. A shop on Magnolia Avenue with an 1890s mortise lock needs someone who knows lever-tumbler internals, not someone who reaches for a drill. A property off Sir Francis Drake Boulevard with a main office, a workshop, and a gate needs one visit that keys everything alike, not three separate invoices. That’s the work we do under the Dunmore name, which comes from old words for a great fort, a stronghold built to keep what’s inside safe.
Our owner, Perry Osgood, holds every job to the Threshold Standard: background-checked, identity-verified technicians sent to you by name and photo before the visit, uniformed, with a photo ID badge shown at the door. The price goes in writing before any work begins. If it’s not done right, the 365-Day Done Right Promise means we return at no charge. That’s not a marketing line; it’s stamped on every job. For commercial clients in Larkspur who’ve been burned by drive-by locksmiths, that distinction matters.
We’re part of the Threshold Group family, operating since 2007, and our Larkspur customers tend to be business owners and property managers who value knowing exactly who’s coming before they open the door. Our phones are answered by a live person 24 hours a day, every day of the year, coordinated from our San Francisco Bay Area office.
Mortise Lock Replacement in Larkspur
Mortise lock replacement in Larkspur most often means rescuing a century-old storefront on Magnolia Avenue whose original lock body has finally seized, or whose skeleton-key cylinder has corroded past repair in the coastal fog. A full mortise lock replacement here typically runs $220 to $450 depending on the lock body size, trim finish, and whether we’re matching an existing mortise prep in a Victorian door. We do not drill first and ask questions later. Non-destructive entry is our default on original warded and lever-tumbler mechanisms, and we stock period-appropriate picks along with modern Euro-profile mortise replacements that drop into the same pocket.
What owners in Larkspur tell us they want is simple: keep the old door, upgrade the security, and don’t leave a mess of sawdust and a patched knob hole. We match the mortise body dimensions to the existing prep so a 1905 door keeps its character while the new cylinder handles modern keys, drill resistance, and marine moisture.
When a mortise lock can be saved instead of replaced
Corrosion in a mortise cylinder doesn’t always mean the whole lock body is dead. We disassemble, clean, and lubricate the internal lever tumblers, then replace only the cylinder with a fog-resistant unit. That repair runs about $95 to $160 and usually takes under an hour on site.
If the lock body shows cracked springs or a broken deadbolt throw, replacement is the honest answer. We’ll show you the failure before quoting the replacement so you’re not paying for a new lock when a $40 part fixed it.
Replace Commercial Door Lock in Larkspur
Replace commercial door lock work in Larkspur spans two very different jobs: upgrading a modern ANSI Grade 1 deadbolt on a newer storefront, or retrofitting one onto a 1910 door whose original mortise prep doesn’t match anything sold at a big-box store. Replacing a standard commercial deadbolt or lever lock here typically runs $120 to $260, and the job is usually done in one visit.
What catches Larkspur owners off guard is the retrofit. A modern Grade 1 deadbolt has a 2-1/8 inch bore. A Victorian mortise lock pocket is rectangular and deep. Bridging the two means a faceplate adapter, a reinforced strike, and often custom trim. We do that work in-house, quote it as a flat price, and don’t pass it off as a “simple swap” when it isn’t.
Retrofits on 1880s to 1925 storefronts
The historic flats and storefronts along Magnolia Avenue and the surrounding blocks still carry original mortise preps. We keep faceplate adapters and trim rings in the truck for these jobs, so a retrofit is one visit, not a two-week special order.
For buildings that can’t accept a modern bore without structural compromises, we recommend keeping the mortise body and upgrading the cylinder with a high-security Medeco or Mul-T-Lock core. Same key control, no butchering of the door.
Trusted Brands We Service in Larkspur
We’re factory-authorized for Schlage, Medeco, Mul-T-Lock, Abloy, and Sargent, along with Baldwin, Kwikset, and Yale hardware. For Larkspur commercial clients, we keep Medeco and Schlage cylinders in stock locally because they hold up better against coastal fog than brass-bodied budget hardware. If you have a mixed building with older Yale mortise locks on one door and newer Schlage levers on another, we can key them all to a single system in one visit rather than leaving you with a keychain of mismatched keys. Medeco high-security cylinders are the most common upgrade we recommend for Larkspur storefronts because key duplication is controlled and the cylinders resist picking, drilling, and the salt air that eats cheaper hardware within a season or two.
Common Commercial Locksmith Problems We See in Larkspur Homes
- Fog-corroded cylinders on Magnolia Avenue storefronts. The near-daily marine moisture off Richardson Bay accelerates corrosion inside brass cylinders faster than inland Marin, so a lock that worked in June can seize by October. We replace with fog-resistant units and corrosion-inhibiting lubricant.
- Swollen wood frames throwing strikes out of alignment. The wet season swells the original door frames on Larkspur’s 1885 to 1925 buildings, so a deadbolt that threw fine in September won’t budge by January. We realign the strike plate and deepen the throw path without hacking the century-old frame.
- Partial rekeys that miss outbuildings and gates. Acreage properties toward Baltimore Canyon and the hills above town often have a main building, a workshop, a gate, and a file cabinet or two. A single-door rekey leaves the owner with two key systems and a second service call. We key everything alike in one trip.
- Vehicle lockouts at the Larkspur Ferry Terminal. Commuters sprinting to make a Golden Gate Ferry boat lock keys inside in the sprawling parking lot more mornings than anyone likes to admit. We know the lot access points and reach it quickly during the morning departure window.
Pricing for Commercial Locksmith in Larkspur, CA
Here’s what Larkspur commercial customers can expect, in writing before we start. Rekeying a single storefront cylinder runs $95 to $160. Replacing a standard commercial deadbolt runs $120 to $260. Mortise lock replacement on a Victorian storefront runs $220 to $450 depending on the body size and trim. Master key system setup for a commercial property with multiple doors starts around $350 and up depending on the number of cylinders. Access control installation, panic bar installation, and high-security cylinder upgrades are quoted as flat per-door prices after a site visit. No call-out surcharge added on arrival. The price we quote on the phone is the price on the invoice. Call (910) 714-4287 for a free estimate.
We Also Serve Cities Near Larkspur
Our Commercial Locksmith coverage extends beyond Larkspur to Kentfield, Corte Madera, San Rafael, and Mill Valley. If your business sits on the border of Larkspur and another Marin town, we coordinate dispatch from our San Francisco Bay Area office so the crew arrives ready for your specific building type. Learn more about what we offer at our Commercial Locksmith in Larkspur page. Same written pricing, same 365-day guarantee, same named technician before the visit.
Serving Larkspur, CA - Our Local Coverage Area
We’re based in the Larkspur 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 Larkspur
Yes. We rekey original mortise locks on Larkspur’s 1880s to 1910s buildings without replacing the door or the lock body. We disassemble the cylinder, swap the internal pins so the old keys no longer work, and reassemble with corrosion-resistant lubricant. A mortise cylinder rekey runs $95 to $160 and typically takes under an hour. If the lock body itself is failing, we’ll show you the exact damage before recommending replacement. Call (910) 714-4287 and describe your building; we’ll tell you over the phone whether a rekey is likely to work.
The deadbolt is likely fine; the door frame is the problem. Larkspur’s wet season swells the original wooden door frames on Victorian-era buildings, shifting the strike plate just enough that the deadbolt throw catches. We realign the strike, deepen the throw path, and often add a rust-inhibiting strike plate liner. The fix runs about $95 to $140 on site. Call (910) 714-4287 and we’ll schedule a visit when the moisture is at its worst so we can see the alignment shift in real time.
Yes, and we do it in one visit. We survey the main building, any outbuildings, gates, file cabinets, and padlocks, then build a master key system where you get one key for everything and limited keys for staff or tenants who should only open certain doors. Master key setup for a typical Larkspur commercial property starts around $350 depending on cylinder count. The survey and written scope come before any work begins. Call (910) 714-4287 for a free estimate.
We service Schlage, Medeco, Mul-T-Lock, Abloy, Sargent, Yale, Baldwin, and Kwikset hardware. For Larkspur’s coastal exposure, we typically recommend Medeco or Mul-T-Lock high-security cylinders because they resist corrosion, picking, and unauthorized key duplication. If you have a mixed hardware set across multiple buildings, we can key everything to a single system regardless of brand. Call (910) 714-4287 with your hardware list and we’ll tell you what’s serviceable and what’s worth replacing.
Yes, and we plan the visit to cover every lock on the property in one trip. We ask about all outbuildings, gates, padlocks, workshops, and file cabinets during the phone call so the truck is stocked for everything you have. The price includes a written scope before we start and a flat per-lock price, not an hourly rate that inflates with every additional door. Call (910) 714-4287 and tell us how many structures and locks you have; we’ll quote the full job before anyone is dispatched.
Written by Perry Osgood, Owner at Dunmore Locksmith, serving Larkspur since 2007.