What does deadbolt installation actually involve?
A deadbolt looks simple from the outside: a knob or thumbturn, a keyway, and a steel bolt that slides into the door frame. The work is in the fitting. The bolt has to line up with the strike plate in the frame to within a small fraction of an inch, the door has to be bored to the right size, and the screws have to bite into solid framing rather than just the trim. When any of those details is off, you get a deadbolt that sticks, needs a shoulder shove to lock, or sits in the door looking secure while barely protecting anything.
We handle both situations people call about. The first is a door that has never had a deadbolt, only a knob lock or a latch, and you want a real second layer of security. The second is a deadbolt replacement: the existing one is worn, loose, stripped, damaged after a break-in attempt, or tied to keys you no longer want in circulation. Either way, we bring the hardware, do the work at your door, and leave you with a lock you can operate with one hand on a bad day.
This page covers installing and replacing deadbolts specifically. If what you need is a full set of new locks on every door, our lock replacement service is the better fit, and we will point you there during the call if that is the case.
Single-cylinder or double-cylinder deadbolt: which one belongs on your door?
Most homes should have a single-cylinder deadbolt. It has a keyway on the outside and a thumbturn on the inside, so anyone in the house can leave quickly without searching for a key. That matters in a fire, and it matters when someone has a medical emergency and responders need the door open fast.
A double-cylinder deadbolt has a keyway on both sides. Its real value is on doors with glass in or beside them. If a burglar can break a pane and reach through, a thumbturn is within arm's length; a keyed inside cylinder takes that option away. The tradeoff is serious: with a double-cylinder lock, a key has to be found in an emergency. Fire and building rules in some situations limit keyed-both-sides locks on exit doors, and rental properties may have their own rules, so check with your landlord or property manager before choosing one.
When we install a double-cylinder deadbolt, we talk through the habit that makes it safe: keep the key in a consistent spot near the door, out of sight from outside and out of reach of a broken pane, and make sure everyone in the household knows where it is.
- Single cylinder: key outside, thumbturn inside. Fastest exit, right for most solid doors.
- Double cylinder: key on both sides. Makes sense next to glass panels or sidelights, with a clear key-storage habit.
- Deadbolt with an interior thumbturn plus a rekeyable cylinder: a practical choice if you expect to change who holds keys down the road.
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Call (213) 577-1366How we install a deadbolt, step by step
Every install follows the same discipline, whether the door is a solid-core front door or a metal-clad side door on a detached garage. We do not rush the alignment, because alignment is what separates a lock that works for years from one that binds by the next season.
- Look over the door and frame. We check the door's thickness, material, and condition, the frame's solidity, and whether there is any warping or sagging that will fight the bolt.
- Confirm the hardware. We match the deadbolt to the door: backset, bore size, and whether a single or double cylinder suits how the door is used.
- Mark and bore the door. For a new install, we use a template and the correct hole saw so the cross bore and edge bore are square to each other. For a replacement, we confirm the existing bores are intact and not oversized from earlier damage.
- Fit the bolt and cylinder. The latch goes in the door edge, the cylinder and thumbturn assemble through the door, and the mounting screws are tightened evenly so nothing twists.
- Install the strike plate. We mortise the frame for a flush fit, then use long screws that reach into the wall stud behind the jamb, not just the soft trim. This is the step that most affects how well the door resists a hard kick.
- Test through the full range. We lock and unlock several times with the door open and closed, check that the bolt extends fully, and make sure it does not rub or need lifting or pushing.
- Hand over the keys and walk you through it. You get the working keys and a plain explanation of how the lock operates, including any double-cylinder key habit.
When is deadbolt replacement the better move?
Not every troublesome deadbolt needs to come out. Sometimes the lock is fine and the door is the problem: a door that has swelled or shifted so the bolt no longer meets the strike plate. We check that first, because moving a strike plate is a lighter job than swapping a deadbolt.
Replacement makes sense when the cylinder is worn and keys turn roughly, when the bolt will not retract reliably, when the lock has been forced or pried, when the finish and internals have failed, or when you are upgrading to a more robust grade. It also makes sense when you have moved into a place and do not know who has keys.
If the lock itself is sound and your only concern is who has keys, a rekey can change the key without replacing hardware. We will tell you plainly which route fits. If we think a rekey solves your problem, we will say so rather than sell you a new lock.
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Call (213) 577-1366How much does deadbolt installation cost in Monterey Park?
We do not quote a price on a web page, because the honest answer depends on the door and the hardware, and a number written months ago helps nobody. What we can do is tell you exactly what moves the cost, so you can judge any quote you get, ours included.
Replacing an existing deadbolt in an intact door is usually the more economical route. A new install on a door that has never had one involves boring, which takes more time and care.
- New install versus replacement: boring a door for the first time is more labor than swapping like for like.
- Hardware grade: a basic residential deadbolt and a heavier-duty, higher-security model differ in materials, internals, and drill and pick resistance.
- Single versus double cylinder: double-cylinder units generally cost more because of the extra cylinder.
- Door and frame condition: a cracked jamb, an oversized bore, or a warped door adds repair work before the lock can sit properly.
- Number of doors: matching several deadbolts to one key, or doing several in one visit, changes the per-door effort.
- Time of day and location: after-hours calls and travel to your address can affect the total.
Deadbolts for Monterey Park homes: what we see on local doors
Monterey Park has a mix of housing, and the door you have drives most of the decisions. In the southern flats near Montebello, prewar bungalows often have older doors that have been refinished or rehung over the decades. Those doors may have outdated bores or latch cutouts that do not quite match modern hardware, so we check the door carefully before we cut anything. Older apartment buildings in the southern flats also tend to have aging mailbox locks, and while that is a different job, our mailbox lock replacement service is available if the mailbox needs attention while we are on site.
Up in the Monterey Highlands and the northern hillsides near Alhambra, postwar ranch homes commonly come with long driveways and detached garages. That detached garage side door is a frequent weak point: it is out of sight of the street and often has just a knob lock. A properly installed deadbolt there is among the more useful upgrades we do. Hillside homes in the Monterey Highlands area also come up for key control after a move, and a new deadbolt installed alongside a key change is a clean way to start fresh.
Closer to Atlantic Boulevard, Garvey Avenue, and Atlantic Times Square, condo and townhome construction from the 1980s to the 2000s is common. These units have shared entries and building-managed hardware, so the unit's own front door is where a deadbolt matters most. After a lockout near Atlantic Times Square, it is common to find the door's existing lock damaged or worn; we can replace it with a deadbolt that fits the existing door. In both 91754 and 91755, check your HOA or building rules about hardware finish and type before you buy.
On the weather side, Monterey Park's hillside-and-valley setting means warm summers and marine-layer mornings in May and June. Sun-exposed hillside doors weather faster than those in the flats, and while the effect on locks is modest, a door that has moved slightly with the seasons can pull a bolt out of alignment. That is why we test the throw on every install and adjust the strike plate when needed. We are based in Westwood, about 19 miles from Monterey Park, and our mobile locksmith service brings the tools and hardware to your door.
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Call (213) 577-1366Choosing grade, finish, and extra features
Deadbolts are not all the same inside. Heavier-duty models use thicker steel bolts, hardened inserts that resist drilling, and cylinders that are harder to pick or bump. If your door faces a street, sits next to a glass panel, or protects something valuable, it is worth stepping up. Our high-security lock options cover those models and how they differ from standard hardware.
If you are thinking about keyless entry, a keypad or app-controlled deadbolt may be what you want instead of a traditional one. That is a different installation with its own considerations, and we cover it on our smart lock installation page.
Finish matters mostly for looks and for building rules. We carry common finishes so the new deadbolt matches the handle set, and we can talk through which finishes tend to hold up better on sun-exposed doors.
Why call Wilshire Lock & Key for your deadbolt
We have been in business since 1987, and deadbolt work is a core part of what a residential locksmith does every week. We operate a storefront at 10740 Wilshire Blvd in Westwood and run mobile service vans, so the person who answers your call is part of the same company that comes to your door. There is no dispatch middleman sending a stranger you have never spoken to.
David, the owner and lead technician, oversees the work. That matters on installs, because the details that make a deadbolt last, such as square bores, a flush strike plate, and long screws into framing, are the ones that are easy to skip when someone is in a hurry.
Our phone is answered 24 hours a day, 7 days a week, year-round at (213) 577-1366. If you are locked out of your home before an install, our house lockout service handles that first. If you manage rental units and need several doors done consistently, we also work with landlords and property managers.
What to ask any locksmith before they start
California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services (BSIS), called an LCO license. Ask any locksmith for that license number before work begins, and verify it with the state. That is a fair request to make of us as well.
A few other questions are worth asking. Is the quote based on the actual door and hardware, or is it a vague range? Is the strike plate being installed with long screws into the framing? Will you test the lock several times before the technician leaves? Will you receive all the keys? A reputable locksmith answers these without hesitation.
Frequently asked questions
Can you install a deadbolt on a door that never had one?
Yes. We bore the door with the correct tools, fit the bolt and cylinder, and install the strike plate into the frame. Before we start, we check that the door is thick enough and solid enough to take a deadbolt without weakening it. Some hollow or very thin doors need extra care, and we tell you plainly if a door is a poor candidate.
What is the difference between deadbolt installation and deadbolt replacement?
Installation means adding a deadbolt where there was none, which requires drilling new holes in the door. Replacement means swapping an existing deadbolt for a new one in holes that already exist, which is usually quicker and more economical. We assess your door first and tell you which one applies.
Is a double cylinder deadbolt a good idea for my front door?
It depends on the door. A double-cylinder deadbolt is useful next to glass a burglar could break, but it requires a key to exit, which can be a hazard in a fire. Many homes are better served by a single cylinder. Rental units and some buildings may have rules on keyed-both-sides locks, so check first. We can help you weigh it.
Can you match the new deadbolt to my existing key?
Often, yes, depending on the brands involved. If the new deadbolt can be keyed to match your existing lock, you carry one key for both. If not, we can key it to match another lock we install, or change the key on the existing one. Tell us what you are aiming for and we will plan around it.
My deadbolt is hard to turn. Do I need a replacement?
Not necessarily. A stiff deadbolt is often caused by a misaligned strike plate or a door that has shifted, not a failing lock. We check the alignment first. If the bolt moves freely when the door is open but binds when closed, adjusting the strike is usually the fix. If the cylinder itself is worn, replacement is the right call.
Do you install deadbolts on detached garage doors and side doors?
Yes. Side doors and detached garage doors are common weak points, especially on hillside properties with long driveways. We fit a deadbolt suited to the door material, whether wood, metal, or clad, and make sure the frame can hold the strike plate firmly.
Can you install a deadbolt in the middle of the night?
Yes. Our phone line at (213) 577-1366 is answered 24 hours a day, 7 days a week, and our mobile vans serve Monterey Park. If your door was forced or the lock was damaged and you cannot secure your home, call and we will work out the quickest way to get it secured.
How do I know a locksmith is legitimate in California?
California requires locksmith companies to hold a BSIS LCO license. Ask for the license number and look it up with the state before work begins. Also ask who will come to your door, how the price is determined, and whether the work is done by the company you called or passed to an unknown contractor.
More locksmith help in Monterey Park
Deadbolt Installation near Monterey Park
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.