Do you need a new deadbolt, or a different fix?
Most calls we get about deadbolts start the same way: the lock still works, sort of. The key needs a jiggle. The bolt only slides home if you lift the door or push it toward the hinge side. Or there is no deadbolt at all, and the only thing between your family and the street is a knob lock that came with the house. Those are three different problems, and they do not all end in a new deadbolt.
A deadbolt installation makes sense when the door has no deadbolt, when the existing one is worn past the point of reliable repair, when you have lost track of who holds keys, or when you want a stronger grade of hardware than what was originally there. If the lock is fine mechanically and you only worry about old keys, rekeying is the lighter-cost route, and you can read about it on our lock rekeying page. If the bolt is fine but the door has shifted, the fix may be in the strike and the door, not the lock.
We will tell you which of those you are dealing with before we cut or drill anything. A good deal of honest locksmith work is simply deciding not to replace something that can be adjusted, and also not patching something that has reached the end of its life.
Single or double cylinder: which deadbolt fits your door?
A single-cylinder deadbolt has a keyway on the outside and a thumb-turn on the inside. It is the standard choice for nearly every front door we work on. You can lock and unlock it from inside without a key, which matters a great deal if you ever need to leave in a hurry.
A double-cylinder deadbolt takes a key on both sides. People ask for it when the door has a glass panel or a sidelight within arm's reach of the lock, because a burglar who breaks the glass cannot simply reach in and turn a thumb-turn. That is a real benefit. The tradeoff is just as real: in a fire or other emergency, someone has to find the key before they can get out. Fire and egress rules often restrict keyed-both-sides locks on residential doors, and what is allowed can depend on the type of building and the door's use. Check with the local building or fire authority if you are unsure, and we will tell you plainly what we would and would not install on a given door.
If you want the added resistance of a double-cylinder lock, there are ways to keep it safer. Some households keep a key stored on a hook near the door, out of reach of the glass but easy for family to find. Others choose a single-cylinder lock and add security film or replace the glass with a sturdier panel. We will walk through the options when we see the door.
- Single cylinder: key outside, thumb-turn inside. Best for most front doors and the easiest to use in an emergency.
- Double cylinder: key on both sides. Considered mainly for doors with glass nearby, with an egress tradeoff you should weigh seriously.
- Either style can be keyed to match your other locks, so you carry fewer keys.
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We answer around the clock, every day of the year.
Call (213) 577-1366How we install a deadbolt, step by step
Installation is precision work more than brute work. A deadbolt that is a fraction off will bind, and a bolt that binds gets left unlocked, which defeats the purpose. This is how we approach it on a typical residential door.
- Look at the door and frame first: the material, the thickness, the condition of the edge, and whether the door has swollen or sagged. We check how the door sits in its frame before we touch the lock.
- Choose the hardware with you: single or double cylinder, the grade, the finish, and whether it should be keyed to match your existing locks.
- Mark and prepare the door. If there is already a hole for a deadbolt, we measure and confirm it matches the new lock. If not, we use proper hole saws and a jig so the cross bore and the edge bore line up. Freehand drilling is how doors get split.
- Fit the latch and the lock body, then mount the cylinder and the interior piece so they sit flat and square against the door faces.
- Install the strike plate in the frame, set to the right depth so the bolt travels fully. We use screws long enough to reach the framing behind the jamb, not just the thin trim.
- Test with the door open, then closed, then under normal use. The bolt should extend and retract without pushing, lifting, or leaning on the door.
- Hand over the keys, show you how the lock operates, and tell you what to watch for as the door changes with the seasons.
What affects the cost of deadbolt installation in La Puente?
We do not quote numbers in a web page, because the honest answer depends on the door in front of us. What we can do is tell you what moves the cost, so nothing surprises you when we give you the figure by phone or on site.
The biggest factor is whether the door is already prepared. Replacing an existing deadbolt with a matching one is quick work. Cutting a new deadbolt hole into a door that never had one takes more time and more care. The hardware itself is the next variable: a standard-grade deadbolt and a high-security cylinder with pick and drill resistance are very different products, and the cost reflects that.
Door condition matters too. A door that has swollen, warped, or had a previous bad installation may need the old holes plugged or repaired, or a reinforcing plate added, before the new lock will sit right. Frame work, such as a cracked jamb or a strike that needs a deeper mortise, also adds time.
Other things that influence the final figure:
- Single versus double cylinder, and the grade of the lock you choose.
- Number of deadbolts, and whether they should all be keyed alike.
- New installation versus replacement of an existing lock.
- Whether the door or frame needs repair or reinforcement.
- Finish and brand, which affect the hardware cost.
- Time of day and location, since after-hours service and travel are part of the call.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Deadbolt replacement: what we find on older doors
A lot of deadbolt replacement work starts with a lock that has quietly worn out. Brass and zinc parts wear against each other for decades. The key starts to stick, the thumb-turn gets stiff or loose, and the bolt does not extend all the way. People live with it for years because the lock still technically locks. Then the day comes when it does not, and it fails with the door shut and everyone outside.
When we replace a deadbolt, we also look at what the old one was telling us. If the bolt was dragging, we find out why. If the strike plate has chew marks, the door may have been shifting against it. If the screws in the jamb are short, we replace them. Putting a good new lock into a frame that is still misaligned just moves the problem somewhere else.
Replacement is also a chance to match the rest of your hardware. If your knob lock and your deadbolt are keyed differently, you carry two keys for one door. We can usually key a new deadbolt to match, or in some cases set up a whole entry set. For a broader look at swapping out hardware, our lock replacement service page covers the whole range, from single cylinders to full sets.
Deadbolts on 1950s tract homes around La Puente
La Puente is mostly single-story stucco tract homes from the 1950s, built when the area subdivided quickly after the war. They sit on modest lots, many with detached garages, and owner occupancy is high. That mix shapes the deadbolt jobs we do here.
A home near La Puente Park or in the Old Town La Puente area often still has hardware from the original build or from a repair decades ago. Original locksets are worn, and a lot of these homes have only a knob lock on the front door. Adding a deadbolt to a door like that is a common job. In ZIP codes 91744 and 91746, we regularly see the same pattern: a sound old door, a worn old lock, and an owner who wants the front entry brought up to date without replacing the door itself.
The Hacienda Boulevard and Amar Road corridors have a different feel. Apartment stock in La Puente is limited and concentrated near the major corridors, so the unit-door deadbolt calls tend to come from there, and a landlord who needs several doors done at once is better served by our residential locksmith work and a single visit. The Valinda and Bassett border areas, just outside city limits, get the same service from the same vans.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Local details that change how we install
The climate in the eastern San Gabriel Valley is hot and dry in summer, mild in winter, with no coastal salt air to corrode hardware. That is good news for the lock itself, since finish failure from salt exposure is not a concern here. The practical effect is on the door. Wood doors on postwar tract homes swell and shrink with the seasons. A bolt that slides cleanly in spring can start to rub on a hot stretch, and then loosen again later. When we set the strike, we leave the bolt enough clearance to handle that movement without letting the door rattle in the frame.
Security screen doors are a common retrofit on La Puente homes, and they affect deadbolts more than people expect. A screen door that closes close to the main door can crowd the key, block the hand when turning the lock, or catch on a thumb-turn. Before we choose a lock, we look at the clearance and, where needed, pick a lock and finish that works with the screen door installed.
Many households here are multigenerational, with several adults coming and going. That raises a key-control question that is easy to overlook. If five people carry keys, one lost key matters more. We can set up a new deadbolt with new keys and give you a clear count, so you know exactly how many exist. If you later want extra copies, key duplication is a separate, simple job.
Finally, detached garages are common on these lots. A side door to the garage often has a weak lock, or none, and it leads to tools and sometimes a way into the house. A deadbolt on that door is a small job with an outsized benefit.
What a deadbolt can and cannot do
A deadbolt is only as strong as the door and frame around it. We say this to every customer because the best lock in the world will not stop a kick that splits a thin jamb. If the strike plate is held by short screws into the trim, the door can fail at the frame while the bolt stays perfectly locked.
That is why installation includes the strike, the screws, and the frame. Longer screws reaching the structural framing make a real difference. In some cases, a reinforcing plate on the door edge or jamb is worth adding. We will point it out when we see it, and you decide.
If you want something stronger than a standard grade, we can talk through high-security deadbolt options, which cover pick-resistant cylinders, hardened inserts, and restricted keyways that block unauthorized copying. If you are thinking about keyless entry, ask us about a smart lock as well. The deadbolt is still the mechanical core, so the installation quality matters just as much.
One more honest point: no lock replaces good habits. A deadbolt that is never thrown protects nothing. If the thumb-turn is awkward or the key sticks, people stop using it. We set the lock so it is easy enough that you actually lock it every night.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Why call Wilshire Lock & Key for a deadbolt in La Puente?
We have been in business since 1987, and deadbolts are bread-and-butter work for us. We have a storefront at 10740 Wilshire Blvd in Westwood and mobile service vans, so the work comes to you. La Puente is about 29 miles from our base, and we serve 140 cities across Los Angeles and Ventura counties, which means our crews are used to travel and carry what is needed on the van. When a job needs a part we do not have on hand, we say so up front.
You deal with one company, not a call center that hands your address to a random subcontractor. David, the owner and lead technician, oversees the work, so there is a person accountable for how the job turns out. The phone at (213) 577-1366 is answered 24 hours a day, 7 days a week, all year, which matters when a lockout or a break-in attempt forces a same-day lock change. If you are locked out in the meantime, that is a separate service and you can learn more about house lockout help.
A fair thing to do with any locksmith, us included: ask about licensing. California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services, known as a BSIS LCO license. Ask any locksmith you call to give you that number and verify it with the state. Our license number is being added to this site, and you are welcome to ask us about it directly.
Because we travel to you, our mobile locksmith service covers the whole city, from Old Town La Puente to the Hacienda and Amar corridors.
What to have ready when you call
A few details help us come prepared and give you a more accurate answer on the phone. None of this is required, and if you do not know something, we will sort it out on site.
We will ask about the door, because it drives almost every decision. Is it wood, metal, or fiberglass? Does it have glass? Is there a security screen door in front? We will ask whether you want a new deadbolt added or an old one swapped, and whether you prefer single or double cylinder. If there is an existing lock, a photo of both sides of the door is useful. And tell us how many keys you want and whether the new lock should match your other locks.
- Door material and any glass near the lock.
- Whether a security screen door is in front.
- New deadbolt or replacement of an existing one.
- Single or double cylinder, or ask us for a recommendation.
- How many keys you need and whether to key alike with other locks.
- Anything about the door that sticks, rubs, or has been repaired before.
Frequently asked questions
How long does a deadbolt installation usually take?
It depends on the door. Swapping an existing deadbolt for a matching one is quick. Cutting a new deadbolt hole in a door that never had one takes longer because the holes have to be measured and cut accurately. Door repairs or frame work add time. We can give you a realistic idea once you describe the door on the phone.
Can you add a deadbolt to a door that only has a knob lock?
Usually yes. Many older La Puente homes have only a knob lock on the front door. We check the door's thickness and edge condition, then cut the proper holes and set the strike into the frame. Very thin or damaged doors may need reinforcement, and we will tell you if so.
Is a double-cylinder deadbolt a good idea for my front door?
Only in specific cases, mostly where glass sits close enough that someone could break it and reach the thumb-turn. The tradeoff is that you need a key to get out, which is a real concern in a fire. Egress rules also may limit it on residential doors. We will advise you on whether it suits your door.
Can you match the new deadbolt to my existing key?
Often, yes. If your current locks are a compatible brand and keyway, we can key the new deadbolt to match so you carry one key. If the brands differ, we can rekey or choose a lock that can be keyed to match. We will confirm what is possible before installing.
My deadbolt sticks in summer. Do I need a new one?
Not necessarily. Wood doors on postwar tract homes swell with heat and humidity, and that can make a bolt rub against the strike. Adjusting the strike plate or the door often solves it. If the lock itself is worn, replacement is the better move. We check both.
Will a deadbolt work with my security screen door?
Usually, but clearance is the issue. A screen door that sits close to the main door can crowd the key or block your hand. We check the spacing and choose a lock and finish that you can operate comfortably with the screen door closed.
What is the difference between rekeying and replacing a deadbolt?
Rekeying changes the internal pins so old keys stop working, while the lock itself stays. It is usually the more economical route when the lock is in good shape. Replacement is for worn, damaged, or low-grade locks, or when you want stronger hardware. We will say which fits your situation.
Do you install deadbolts on garage side doors and gates?
We install deadbolts on detached garage side doors, which are common on La Puente lots. For gates, the hardware is different, so see our gate lock repair service. Tell us what the door or gate is made of when you call.
Is your locksmith license on file with California?
California requires locksmith companies to hold a BSIS LCO license, and you should ask any locksmith for it before work begins. Our license number is being added to this site. You can ask us directly, and you can also verify any company through the state.
More locksmith help in La Puente
Deadbolt Installation near La Puente
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.