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 Monrovia
Changing door locks in Monrovia typically costs $95 – $185 for a standard deadbolt replacement and $135 – $260 when we rekey existing hardware so old keys stop working. For full-service home protection, see our Residential Locksmith in Monrovia. Most jobs are finished in under an hour, and we answer the phone live around the clock. If you’ve just moved into a Craftsman off Myrtle Avenue, had a roommate leave, or you’re coming back after a foothill evacuation and you don’t know who has a key, call (910) 714-4287 and we’ll walk you through your options before anyone is dispatched.
Monrovia sits hard against the San Gabriel foothills, and the housing stock changes fast from block to block. South of Huntington Drive you’ll find postwar tract homes with standard cylindrical deadbolts. North of Foothill Boulevard, toward Monrovia Canyon Park, you’ll meet 1920s and 30s Craftsman bungalows with original mortise-box locks that need a different set of hands entirely. Perry Osgood, who runs Change Door Locks at Dunmore Locksmith, makes sure the technician headed to your door knows which kind of Monrovia house you’re in before they leave the truck.
Call us any hour at (910) 714-4287. A live person answers. You’ll get a written price before work begins, and the full price on the phone is the price on the invoice. No call-out surcharge added when the technician arrives.
Why Dunmore Locksmith Is Monrovia’s Preferred Change Door Locks Company
We work under the Threshold Group umbrella, and every job carries the 365-Day Done Right Promise. That’s a written guarantee on every repair and lock change. If the work fails within a year, we return at no charge. Monrovia homeowners tell us they chose us over a cheaper option because they wanted to know, before opening the door, exactly who was standing on the other side of it.
Every Dunmore technician is background-checked and identity-verified under what we call the Threshold Standard. Before the visit, you receive the technician’s name and photo. When they arrive, they wear a clean marked uniform and carry a photo ID badge they show at the door. The name you were given is the name on the badge. If someone shows up who you weren’t told to expect, that visit is covered at no charge. For a parent home alone with kids near Wildrose Avenue, that protocol matters as much as the lockset quality.
Dunmore comes from old words for a great fort, a stronghold built to keep what’s inside safe. That’s the frame we work from in Monrovia. The job is not just turning screws. It’s resetting the boundary between your household and everyone else. Our technicians understand lockout pressure near the canyon, vintage hardware in Old Town, and multi-tenant key control on Myrtle, and they’ll explain your options in plain language before quoting a flat price.
Door Lock Installation in Monrovia
Door lock installation in Monrovia runs $95 – $185 for a standard deadbolt on a prepared door, and more when the door needs a new bore or a specialty strike plate. The Change Door Locks in Monrovia work we do most often falls into two groups: replacing a worn cylindrical deadbolt on a postwar home south of Huntington Drive, or retrofitting a pre-WWII door north of Foothill Boulevard where the original mortise box doesn’t accept a drop-in smart lock.
Replacing Standard Deadbolts
On a typical ranch or bungalow with a standard 2-1/8 inch bore, we remove the old deadbolt, check the jamb for wear or misalignment, and install a new grade 1 or grade 2 lock. Brands we regularly fit include Schlage and Kwikset. The old keys become worthless the moment the cylinder is swapped. Price runs $95 – $185 including the hardware and our labor, quoted in writing before we start.
Mortise and Vintage Hardware
If your Monrovia home still has the original mortise box, installing a common smart-lock conversion kit often won’t work. The box mortise and through-bolt spacing are wrong. We can rebuild the existing mortise lock with new cylinders, install a compatible high-security mortise cassette, or convert the door cleanly to a modern deadbolt with proper reinforcement. Ask about the 365-Day Done Right Promise on every installation.
Patio Door Lock Change in Monrovia
Patio door lock change in Monrovia typically costs $110 – $220, depending on whether we’re replacing a sliding-door handle set or installing a secondary foot lock or keyed latch on a French patio door. Monrovia’s older homes often have a sliding glass door onto a back porch or a sunroom that faces the foothills, and that door is frequently the weakest entry point in the house.
Sliding Glass Door Handle Sets
Most sliding patio doors use a mortise-style handle set that wears out over a decade of daily use. A loose handle, a key that spins without engaging, or a door that doesn’t latch tightly all point to a worn set. We stock common replacement handle sets locally for fast turnaround, and a standard swap runs $110 – $220.
Adding a Foot Lock or Keyed Latch
For homeowners in the foothill neighborhoods near Monrovia Canyon Park, we often add a secondary foot-operated lock at the base of a sliding door. It provides a physical block that a pry bar can’t easily defeat and costs less than replacing the entire door. Every job gets a written price first, and the full total is confirmed before we dispatch.
Trusted Brands We Service in Monrovia
Our Monrovia customers commonly ask for Schlage, Kwikset, Medeco, Abloy, and Baldwin hardware, and we’re factory-authorized to install and service all of them. If you have a Schlage deadbolt that’s starting to bind or a Baldwin handle that’s lost its finish, we carry the matching parts or can order them for quick local delivery. For condo owners and small commercial properties near Old Town, we can set up a Medeco or Abloy restricted key system so keys can’t be duplicated at a hardware store. We stock common cylinders, strike plates, and handle sets locally, so most Monrovia jobs finish in one visit without waiting on a parts order.
Common Change Door Locks Problems We See in Monrovia Homes
- Smart-lock kits that won’t fit original mortise boxes. A homeowner orders a keypad deadbolt online, then discovers the pre-WWII door has a mortise box rather than a standard bore. The new bolt throw misaligns, and the door either won’t latch or binds badly. We resolve this with a proper mortise retrofit or a clean conversion to a modern deadbolt.
- Deadbolts that bind after Santa Ana winds. Strong winds funnel down the canyons above Monrovia and shift wooden door frames enough that deadbolts seize or strike plates misalign overnight. The dry inland-valley heat also swells old jambs seasonally. This is a recurring foothill pattern flatland San Gabriel Valley cities rarely see.
- Multi-tenant key control in Old Town buildings. One lost key in an unmanaged duplex or a small apartment building near Myrtle Avenue means every unit’s entry is compromised. We address it with a master key system or restricted keyway so a single lost key doesn’t require re-keying every lock in the building.
- Post-evacuation lockouts near the canyon. After a red-flag evacuation order lifts north of Foothill Boulevard, residents come home to locks they can’t open. Spare keys were handed to neighbors or fire crews, a door swelled shut in the heat, or a deadbolt shifted. We make same-day runs to Monrovia Canyon Park area homes and get people back inside without drilling.
Pricing for Change Door Locks in Monrovia, CA
Here are the flat ranges we quote over the phone before dispatching anyone to Monrovia:
- Standard deadbolt replacement: $95 – $185
- Rekeying a standard knob lock (changing the internal pins so your old keys no longer work): $85 – $160
- Patio sliding door handle set replacement: $110 – $220
- Mortise lock cylinder rebuild or retrofit: $180 – $340
- High-security or restricted key cylinder installation (Medeco, Abloy): $220 – $420 per cylinder
The range comes from hardware grade, whether the door needs to be re-bored or the strike reinforced, and the age of the existing lock. We don’t lure you in with a teaser number and then pad the invoice on site. The price we give you on the phone is the price on the invoice. Call (910) 714-4287 for an exact quote. Estimates are free.
We Also Serve Cities Near Monrovia
Our technicians regularly run lock changes in Monrovia and the surrounding foothill and valley communities, including Arcadia, Duarte, Sierra Madre, and Baldwin Park. If you’re near the Monrovia border on Huntington Drive or working with a property owner across the Duarte line, call us and we’ll confirm which crew can reach you fastest at (910) 714-4287.
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 Change Door Locks in Monrovia
Most likely no. Original mortise-box locks on 1920s and 30s Craftsman bungalows north of Huntington Drive and around Old Town use a different bore pattern and through-bolt spacing than the standard smart-lock conversion kits designed for modern cylindrical deadbolts. A drop-in smart lock will typically misalign or bind. In some cases we can rebuild the existing mortise with a compatible electronic cylinder or replace the mortise cassette with one that accepts keypad entry, but it requires specialty hardware, not a kit off the shelf. Call (910) 714-4287 and describe what you have; we’ll tell you whether a smart lock is realistic or whether a high-security mechanical retrofit is the better play.
Because spare keys scatter during the scramble to leave. Residents in the foothill neighborhoods near Monrovia Canyon Park often hand spare keys to neighbors, fire crews, or family members stationed outside the evacuation zone, and by the time they return, they don’t have a clear picture of who has what. A lock change or rekey restores key control the same day. We specialize in exactly this post-evacuation surge and can rebuild a mortise lock or rekey a standard deadbolt in under an hour, then set you up with a keypad-ready plan before the next red-flag warning.
Rarely. We use non-destructive entry techniques first, including bypass tools and shims, and we practice them specifically on the older wooden doors common across Monrovia. Drilling is a last resort for locks that are broken beyond bypass, and when it happens, we tell you before making a single hole. After entry, we can adjust the strike plate, rekey the cylinder, or use our Door Lock Repair in Monrovia to fix the lock entirely so the same problem doesn’t happen again. Call (910) 714-4287 and we’ll walk through what’s likely given your exact door and lock.
Rekeying is usually the right move if the existing hardware is still solid and you just need to invalidate old keys. For a standard knob or deadbolt, rekeying runs $85 – $160 per lock. If the hardware is worn, the finish is failing, or you want restricted key control that prevents a property manager from duplicating keys freely, replacement makes more sense at $95 – $185 per lock. In Old Town multi-tenant buildings, we often recommend a restricted key system like Medeco or Abloy so keys can’t be copied at a hardware store without authorization. Call (910) 714-4287 for a written quote before any work starts.
Monrovia’s dry inland-valley heat swells the wooden jambs on older homes, and strong Santa Ana winds funneling down the canyons directly above the city can shift door frames enough that deadbolts bind against the strike plate overnight. It’s a seasonal pattern specific to the foothill edge, and flatland San Gabriel Valley cities see far less of it. The fix usually isn’t a new deadbolt; it’s adjusting the strike plate, shaving a swollen jamb, or resetting a shifted door frame. We check alignment before recommending any lock replacement, and every adjustment is covered by the 365-Day Done Right Promise.
Contact Dunmore Locksmith in Monrovia
If you need door locks changed in Monrovia, call (910) 714-4287 now. A live person answers 24 hours a day, every day of the year. You’ll get a written price before any work begins, the name and photo of your technician before the visit, and a photo ID badge shown at the door. Every job carries the 365-Day Done Right Promise. If it’s not done right, we make it right, at no charge.
Written by Perry Osgood, Owner at Dunmore Locksmith, serving Monrovia and the surrounding San Gabriel Valley foothill communities.