Why a deadbolt is worth installing properly
A spring latch, the kind built into most doorknobs, is there to keep a door closed, not to keep a person out. It can be pushed back with a flexible card or a screwdriver in seconds on many doors. A deadbolt is different. When it is thrown, the bolt is a solid piece of metal that does not retract unless the cylinder or thumbturn turns. That is the whole idea, and it only works if the hardware is good and the installation is right.
The second half of that sentence is where most problems start. A deadbolt that is bought at a hardware store and installed in an afternoon often has a bolt that rubs the strike plate, a bore hole drilled slightly off, or screws that are only biting into the thin door jamb instead of the framing behind it. The lock looks fine from the hallway. Then it sticks every summer, or it gets kicked once and the jamb splits right along the strike.
We install deadbolts for a living, and have since 1987. This page covers how we approach a deadbolt installation or deadbolt replacement in South El Monte: how to choose between single and double-cylinder, what the work involves, what drives the cost without putting numbers on it, and what is particular about the doors in this city. If you are looking for the broader picture of fitting new hardware to a door, our lock installation service page covers that.
Single-cylinder or double-cylinder: which deadbolt do you need?
A single-cylinder deadbolt has a key slot on the outside and a thumbturn on the inside. You lock and unlock from inside with your hand, no key needed. It is the standard choice for the large majority of entry doors, and it is what we install most often.
A double-cylinder deadbolt has a key slot on both sides. You need a key to lock or unlock it from the inside as well as the outside. People ask for double-cylinder installations for one main reason: the door has glass in it, or a window sits close to the lock, and they do not want someone to break the glass, reach through, and turn a thumbturn.
That reasoning is sound, but there is a real trade-off we will always talk through with you. A key-both-sides lock can trap people inside in a fire or other emergency if the key is not where everyone can find it in the dark. Building and fire codes in some situations restrict key-operated locks on exit doors, and rules can differ by property type. We cannot rule on what applies to your building, so check with your landlord, property manager, or the local building department if you are not sure.
- Choose single-cylinder when the door is solid, has no glass within arm's reach of the lock, and you want the fastest and safest exit from inside.
- Choose double-cylinder when there is glass or a side window within reach of the thumbturn and you are prepared to keep a key near the door, out of sight from outside, for everyone who lives there.
- Consider a different fix when glass is the weak point: security film, a shorter reach, or a door change may do more than a key-both-sides lock.
- Ask about a lockable thumbturn or a keyed-inside option that can be switched; some products offer a way to change the inside function later.
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Call (213) 577-1366How we handle a deadbolt installation, step by step
Whether the door already has a deadbolt or is getting its first one, the process follows the same logic. The goal is a bolt that slides fully into solid framing, with no rubbing, no wobble, and a key that turns without effort.
- You call (213) 577-1366 and tell us about the door: wood, metal, or a security screen door in front of it, whether it has glass, and whether you want a new deadbolt or a replacement of an existing one. The phone is answered at any hour, every day of the year.
- We come to you in a mobile van, or you can bring a door or hardware to our storefront at 10740 Wilshire Blvd in Westwood. Most residential work in South El Monte is done on site.
- We look at the door and frame before any drilling: thickness, condition of the edge, backset (the distance from the door edge to the center of the bore), and the state of the jamb. A tired, cracked or hollow jamb changes the plan.
- We go over hardware with you, including single versus double-cylinder, the security grade of the lock, and finish. We tell you what we would choose for that door and why, and you decide.
- For a replacement, we remove the old deadbolt and check that the existing bore and edge holes match the new hardware. For a new installation, we mark and drill the cross bore and edge bore with proper hole saws and a jig, not freehand.
- We fit the deadbolt, install the strike plate, and chisel the jamb so the strike sits flush. We use long screws on the strike that reach the framing behind the jamb, because that is where the real strength comes from.
- We test with the door open, then closed, then locked and unlocked repeatedly. The bolt should extend fully, retract smoothly, and engage without you having to lift, push, or slam the door.
- We hand over the keys, walk you through the lock, and, if you want the keys to match other locks, we discuss that before we leave.
Deadbolt replacement versus a first-time installation
A deadbolt replacement is usually the quicker of the two jobs. The holes are already drilled, so the work is mostly swapping hardware and confirming everything aligns. It makes sense when the old lock is worn, a key has been lost, the finish is failing, or you want a higher-grade lock in the same position.
Before you replace, it is worth asking whether you need a new lock at all. If the existing deadbolt is solid and the only issue is who has keys, rekeying the lock changes the pins inside the cylinder so old keys stop working, and it is usually the more economical route. If the deadbolt is loose, sticks, or the bolt is damaged, replacement is the better call.
A first-time installation on a door with only a knob latch involves more work: measuring, drilling, chiseling, and sometimes reinforcing. This is also where the quality of the door matters. A hollow-core interior-style door will not hold a deadbolt well no matter how good the lock is. If that is what you have on an exterior opening, we will tell you plainly rather than install hardware that gives a false sense of safety.
If you are weighing a keypad or app-based option instead of a traditional keyed deadbolt, that is a different product with its own considerations; see our smart lock installation page.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366What affects the cost of a deadbolt installation?
We do not quote numbers on a web page, because the honest answer depends on the door in front of us. These are the things that move the cost, so you know what you are paying for and can compare quotes fairly.
- The lock itself. Security grade, brand, finish, and construction vary a lot. A heavier-duty deadbolt with a hardened bolt and a better cylinder costs more than a basic one, and the difference shows up under force and over years of use.
- New installation or replacement. Drilling a new bore and fitting a strike takes more time than swapping hardware into holes that already exist.
- Single or double-cylinder. Double-cylinder hardware is less common and the choice can change what is available.
- Door material and condition. Solid wood, steel, fiberglass, and doors with glass all behave differently. A warped or damaged door may need repair first.
- Jamb and strike reinforcement. If the frame is cracked or soft, a reinforced strike or repair adds time and parts.
- How many locks. Doing several doors on one visit is usually more economical per door than separate trips.
- Timing. After-hours and emergency calls take a technician out at odd times; that is a factor in the final figure.
- Matching keys. Keying several locks alike, or to an existing key, is extra work compared with a single standalone lock.
What we see on South El Monte doors
South El Monte is a compact city, and the housing mix shapes the deadbolt work here. Most homes date from the 1940s through the 1960s, modest postwar single-family tracts. Doors from that era are commonly wood, and after decades of heat, paint buildup, and settling, the frames are not always square. That means a new deadbolt can bind unless the strike and bore are set carefully rather than just bolted on.
Security screen doors are a common retrofit in the city. If a screen door sits in front of your main door, it changes the job in practical ways: swing clearance, whether you can reach the deadbolt comfortably, and whether you also want hardware on the screen itself. We take that into account when we choose the lock and the position of the cylinder.
Heat matters too. The city sits in an inland basin with hot, dry summers, and the adjacent Whittier Narrows open space brings some cooling in the evening. Wood residential doors expand and contract through that cycle, and metal doors do the same. A deadbolt that is installed too tightly can fit well in cool weather and bind in a July heat wave. We leave the right clearance so the bolt throws cleanly across the seasons.
On residential blocks near New Temple Park, in the New Temple Park residential area, home lockouts are one of the calls our dispatch line fields. Sometimes the lockout is the moment people realize their deadbolt is poorly fitted or the strike is loose, and the follow-up is a proper replacement. If you are locked out right now, see our house lockout page first and call; we can discuss replacing the lock once you are back inside.
Across ZIP code 91733, the city's mix of homes and light industry means you may live a short distance from the Garvey Avenue corridor or the Santa Anita Avenue corridor, where many properties are business or mixed use. If you run a shop or workspace and need a deadbolt for a back office or side door, the hardware and the rules can differ from a house. Our commercial door hardware page covers that side, and we keep this page focused on residential deadbolts.
The Rush Street industrial district, the south edge near Whittier Narrows, and the commercial properties along the main corridors are mostly warehouse and roll-up door territory. That is not what this page is about, but we serve those addresses too. We are based about 26 miles away in Westwood, and our vans cover South El Monte as part of the 140 cities we serve across Los Angeles and Ventura counties.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Choosing a stronger deadbolt for your door
Not all deadbolts are equal. In the United States, residential locks are commonly rated by ANSI/BHMA grade, with Grade 1 the most demanding, Grade 2 in the middle, and Grade 3 the lightest. Many inexpensive deadbolts sold in big-box stores sit at the lighter end. The grade tells you how the lock performs in standardized tests for cycles and force, though it is not the only thing that matters.
Other features are worth knowing about: a bolt with a hardened steel insert that resists sawing, a full-length one-inch bolt throw into the frame, and a cylinder with some pick resistance. For homes that want to go beyond that, high-security locks add restricted keyways and tighter control over who can copy a key.
One thing no lock can fix is a weak frame. Most forced entries at residential doors defeat the door frame or strike, not the bolt. That is why we spend as much attention on the strike plate, screws, and jamb as on the lock body.
Why call Wilshire Lock & Key for your deadbolt
We have been in business since 1987. David, the owner and lead technician, oversees the work, and he has seen what happens to doors and frames when installations are rushed. That experience shows up in small details: how the hole is drilled, how the strike is seated, and which screws we use.
We are one company. When you call (213) 577-1366, you are not routed through a dispatch middleman who sends the job to whichever contractor picks it up. You have a storefront at 10740 Wilshire Blvd in Westwood and mobile vans, and the people working on your door answer to us.
We will tell you if a cheaper-looking fix will not hold, and we will tell you when a lighter-cost option is perfectly fine. If you only need a deadbolt rekeyed or a strike plate reinforced, we will say so rather than sell you a new lock.
If you own rental property in South El Monte and need deadbolts on several units, our locksmith for landlords page covers tenant turnover and key control. And if you need us to come to you, our mobile locksmith service is how most of our South El Monte residential work gets done.
What to ask any locksmith before they touch your door
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 it, in writing, before work begins, and check it with BSIS if you want to be sure. That is good advice whoever you call, including us.
A few other questions are worth asking: Will the company arrive in a marked vehicle? Is the quote tied to the specific lock and door you are describing, or is it a vague opening figure that grows on arrival? Will you be told which lock is going on your door, and its grade? A reputable company answers all of this plainly. If a locksmith will not describe the job before starting, that is information too.
Frequently asked questions
How long does a deadbolt installation take?
A replacement into an existing bore is usually a short job. A first-time installation takes longer because the door has to be measured, drilled, and the strike chiseled and reinforced. A warped door or damaged jamb adds time. We can give you a better sense once we know the door.
Do you install double cylinder deadbolts in South El Monte?
Yes. We install double-cylinder deadbolts where they make sense, usually doors with glass nearby. We will also explain the safety trade-off, since a key-both-sides lock can slow your exit in an emergency, and local building or fire rules may restrict them in some situations. Check with your landlord or building department if unsure.
Can you replace a deadbolt without changing my door?
In most cases, yes. If the existing holes match standard deadbolt dimensions, we swap the hardware and align it. If the door is badly worn, hollow, or damaged around the lock, we will tell you before installing so you are not paying for a lock that cannot be held securely.
Is rekeying better than deadbolt replacement?
If your deadbolt is in good condition and the only issue is who has keys, rekeying is usually the more economical route. If the lock is loose, sticking, damaged, or you want a stronger grade, replacement is the better choice. We will tell you which applies after looking at it.
I have a security screen door. Does that affect installation?
It can. Security screen doors are a common retrofit in South El Monte, and they change swing clearance and how comfortably you can reach the deadbolt. We account for that when choosing the lock and position, so the hardware works with the screen door closed.
Can a deadbolt stick in hot weather?
Yes. Wood and metal doors expand in heat, and a deadbolt installed with no clearance can bind in summer. South El Monte's inland basin heat makes this a real consideration. We set the bore, strike, and bolt clearance to work across seasons, and we can adjust an existing lock that has started to bind.
Do you come to my home, or do I bring the lock in?
We come to you. Our mobile vans handle most residential deadbolt work on site. Our storefront at 10740 Wilshire Blvd in Westwood is also available if you prefer to bring hardware in. Call (213) 577-1366 at any hour to arrange it.
What should I do if I am locked out and also want a new deadbolt?
Get back inside first. Call us at (213) 577-1366 and we will handle the lockout, then talk through replacing the deadbolt if the lock is worn or the keys are no longer secure. Handling both in one visit is often more convenient.
How do I know a locksmith is legitimate?
California requires locksmith companies to hold a BSIS LCO license. Ask for the number before work begins and verify it with BSIS. Also ask for a clear description of the job and the lock being installed. If a company will not give you that, call someone else.
More locksmith help in South El Monte
Deadbolt Installation near South El Monte
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.