When does a door need a new deadbolt?
Most deadbolt calls start one of three ways. The first is a door with no deadbolt at all, relying only on the spring latch in the knob, which a firm shove or a thin piece of plastic can often defeat. The second is an existing deadbolt that has worn out: the key sticks, the thumbturn drags, or the bolt only slides home if you lift the door while turning. The third is a change in who holds the keys. Someone moved out, a key went missing, or you just bought the place and have no idea who still has a copy.
Deadbolt installation and deadbolt replacement are related but not the same job, and it helps to know which one you need. Replacement puts a new bolt into a door that is already drilled for one, so the work is mostly about matching the existing hole sizes and getting the strike lined up. A first-time installation means boring a new hole through the face of the door and another into its edge, which is where careful measuring and the right tools matter. We do both, and on the phone we will ask a few questions about the door so the right parts are on the van.
One honest note: if your lock works fine and your only worry is who has a key, a rekey may be the lighter-cost option. We would rather tell you that than sell you hardware you do not need.
Single-cylinder or double-cylinder deadbolt: which should you choose?
A single-cylinder deadbolt takes a key on the outside and has a thumbturn on the inside. It is the standard choice for most homes because anyone inside can leave quickly without hunting for a key. If your door is solid and has no glass within arm's reach of the lock, this is almost always the right answer.
A double-cylinder deadbolt takes a key on both sides. The reason people ask for one is simple: if the door has a window in it or right beside it, a burglar who breaks the glass can reach in and turn a thumbturn. With a keyed cylinder inside, that does not work. The trade-off is real, though. In a fire or any emergency, whoever is inside needs the key in hand to get out. Many fire and building codes restrict keyed-from-inside locks on doors that serve as a required exit, and the rules tend to be stricter for apartments and shared buildings than for a single-family house.
So when someone asks us for double cylinder deadbolt installation, we talk through the door first. We will not put one where it creates a trap, and if it is allowed and you still want it, we recommend a set habit for where the key lives, within reach of the door but not within reach of a broken pane.
- Choose single cylinder when the door is solid, when children, elderly relatives or guests live in the home, or when the door is a required exit.
- Consider double cylinder only when glass sits close to the lock, the door is not a required exit, and everyone in the household will reliably keep the key handy.
- If glass is the worry, other fixes exist: a single-cylinder bolt with reinforced or replaced glazing, or a different door. We will lay out the options on site.
- If you want keypad or app control instead of a key, that is a different product, and our smart lock installation work covers it.
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We answer around the clock, every day of the year.
Call (213) 577-1366How does deadbolt installation work, step by step?
Here is how a typical visit goes from the first phone call to the finished door.
- You call (213) 577-1366. The person who answers is with our company, not a call center reselling your job. We ask about the door: wood, metal or fiberglass, whether it has glass, whether a deadbolt hole already exists, and whether it is an exterior or interior door.
- We settle on hardware with you: single or double cylinder, the security grade, the finish, and whether you want the new lock keyed to match another lock you already own.
- On site we check the door's thickness and condition, then measure the backset, which is the distance from the door's edge to the center of the lock hole. We mark the centers and check the height against your existing hardware.
- For a new installation we use a drilling jig so the face hole and the edge hole are square to each other. For a replacement we confirm the existing holes are the right size and not cracked or oversized.
- We set the bolt into the door edge, pass the cylinder through the face, connect the tailpiece and secure the assembly.
- We mortise the strike plate into the frame so it sits flush, then fasten it with long screws that reach the framing behind the jamb, not just the thin trim.
- We test the lock with the door open, then closed, then with the door shut and the bolt cycled repeatedly. The bolt should extend fully, retract smoothly and need no lifting or pulling on the door.
- We hand over the keys, show you how the lock works, and leave the door cleaned up.
What makes a deadbolt actually hold: alignment, strike plate and screws
A deadbolt is only as strong as the weakest piece around it. People spend on a good lock and then lose the benefit because the bolt barely reaches the frame or the strike plate is held on by half-inch screws. Most forced-entry attempts on residential doors are kicks, and what fails is rarely the bolt itself. It is the door frame or the screws.
Deadbolts are graded by the ANSI/BHMA system, with Grade 1 the most durable and Grade 3 the lightest residential duty. Higher grades generally mean heavier internal parts and a tougher bolt. If you are weighing a standard grade against a heavier one, our high-security lock options explain when the extra hardware is worth it and when it is more than a door needs.
- Bolt throw: a full-extension bolt that enters the frame by about an inch is the usual target for a residential deadbolt. A bolt that only just catches the strike is not doing much.
- Alignment: the bolt should slide in and out without the door being lifted, pushed or pulled. If you have to fight it, the strike is misaligned or the door has sagged, and we fix that rather than forcing the lock.
- Strike plate screws: long screws, around three inches, that bite into the wall stud behind the jamb, make kicking the door in much harder than short screws in the thin jamb.
- Door condition: a split or over-bored door can undermine even the best lock. We check before we drill, and we tell you if the door needs reinforcement or repair first.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366How much does deadbolt installation cost in El Segundo?
We do not quote a flat figure over a web page, because the honest answer depends on the door and the hardware. What we can do is show you what moves the cost up or down, so nothing surprises you, and we tell you the total before work begins.
A straightforward replacement into an existing, well-prepared hole is generally the more economical route. A first-time installation into a door that was never drilled takes more time and more precision, so it costs more. Beyond that, the main factors are below.
- Hardware grade and brand: a basic residential bolt and a heavier, higher-grade one are different products with different price tags.
- Single versus double cylinder: double-cylinder hardware is usually a specialty item, and the code questions above add consultation time.
- Door material and condition: solid wood, steel, fiberglass and glass-paneled doors each drill differently, and a damaged door may need repair first.
- Number of locks: several doors in one visit is usually more efficient than coming back for each.
- Keyed-alike requests: matching new deadbolts to each other or to an existing lock adds a little work.
- Finish and corrosion resistance: finishes built to stand up to coastal air can cost more than basic ones.
- Extras: reinforcement plates, longer strike screws, frame repair or a re-cut jamb are added only if the door needs them.
- Timing: a late-night or weekend call involves different logistics than a planned daytime appointment.
Deadbolt installation in El Segundo: bungalows, salt air and the westside grid
El Segundo's residential area is a compact grid on the west side, mostly 1920s to 1950s bungalows, Spanish-style homes and low-rise apartments, with single-family homes making up most of it. Many of these homes still have their original wood doors and older hardware. That shapes how we do deadbolt installation in 90245. Old wood can be dry and prone to splitting, so we check around any existing bore before enlarging it, and we pick hardware that sits properly on a door that has been painted and re-hung a few times over the decades. A house with only a knob latch and no deadbolt is common in older grids like this, and adding one properly is one of the most useful upgrades we do.
The beach sits directly west of the neighborhood grid, and the marine layer and salt air are hard on exterior hardware. On the homes nearest the water, we regularly see locks, hinges and gate hardware corroded by the air, with stiff cylinders and rough thumbturns. Replacing a salt-air-corroded exterior deadbolt is a common job for us in this part of town, and the fix is not just a new lock. We steer you toward finishes made to resist corrosion, check whether the strike and screws have rusted too, and tell you plainly if the neighboring hinges or the gate latch are next in line. Homes farther east and inland campuses see milder exposure, so the finish matters less there.
In the westside residential grid, apartments are the other big deadbolt scenario. If you rent, check your lease and talk to your landlord before changing a lock, because the building usually has to keep access and the fire rules around exits apply. If you are locked out of your unit, our apartment lockout service is the place to start. If you own rental property, our locksmith work for landlords covers consistent hardware across units and turnover changes.
Downtown El Segundo along Main Street and the converted creative offices in Smoky Hollow have their own door hardware needs, and those are usually commercial-grade jobs rather than a home deadbolt. The same goes for the east-side office campuses. Our storefront is at 10740 Wilshire Blvd in Westwood, about 14 miles from El Segundo, and our mobile vans bring the tools to your door.
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?
We have been in business since 1987, and deadbolts are bread-and-butter work for us. We have a real storefront at 10740 Wilshire Blvd, Los Angeles, CA 90024, plus mobile service vans, so the person on the phone is part of the same company as the person at your door. We do not pass your job to a dispatch middleman who shops it to whoever answers first.
David, the owner and lead technician, oversees how we work, including the small things customers rarely notice: strike plates set flush, long screws in the right places, and a door that locks without a fight. The phone at (213) 577-1366 is answered 24 hours a day, seven days a week, all year. If your door needs attention at an odd hour, our emergency locksmith service is the place to start, and for planned upgrades, our residential locksmith page shows the rest of the home work we do.
How should you vet any locksmith before they work on your door?
California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services, called a BSIS LCO license. Ask any locksmith for it before work begins, and check it against the state's records. That applies to us as it does to anyone else, and you should feel free to ask.
A few other signs separate a real local company from a lead-generation outfit: a business name that matches what the person says on the phone, a physical address, a clear explanation of what will be done and why, and a total given before any drilling begins. If a caller will not tell you who is coming, or quotes an oddly low figure and then adds charges at your door, that is worth a pause.
What should you have ready when you call?
A little preparation makes the visit faster and the quote more accurate. None of it is required, but it helps.
- Whether the door is wood, metal or fiberglass, and whether it has glass in or beside it.
- Whether a deadbolt is already installed, and if so, what is wrong with it: sticking, loose, worn, or just unwanted.
- Whether you want it keyed to match your other locks, and how many doors are involved.
- Whether the home is owned or rented. For rentals, have your landlord's approval in hand.
- Your address and ZIP, so we know the route, and a good number to reach you.
Frequently asked questions
Can you install a deadbolt on a door that never had one?
Yes. We bore the face hole and the edge hole with a drilling jig so the two line up, then fit the bolt and set the strike plate into the frame. First, we check the door's thickness and condition. Very thin or hollow doors, or doors already damaged, may need reinforcement, and we will tell you before we start.
What is the difference between a deadbolt and the latch in my doorknob?
A knob latch is a spring-loaded bevel that holds the door closed but can often be pushed back with a thin tool or force. A deadbolt has a solid bolt that stays extended until you turn the key or thumbturn, so it cannot simply be pushed in. A knob latch keeps a door shut. A deadbolt keeps it locked.
Is a double-cylinder deadbolt allowed on my El Segundo home or apartment?
It depends on the door and the building. Many fire and building codes restrict keyed-from-inside locks on required exit doors, and apartments and shared buildings are typically stricter than single-family houses. We will look at your situation and talk it through. If you rent, confirm with your landlord first, and we will not install one where it creates a safety problem.
Will salt air damage a new deadbolt near the beach?
It can shorten its life if the finish is not suited to the environment. Coastal air and the marine layer corrode exterior hardware on west-side homes closest to the beach. We recommend corrosion-resistant finishes for exterior doors there, and we check whether the strike, screws and hinges are rusted too, since a new lock on a rusted frame does not solve the problem.
Can the new deadbolt be keyed to match my existing lock?
Usually, yes. In many cases we can supply a deadbolt that uses the same key as your front doorknob, or key several new deadbolts alike so one key works everywhere. Tell us what you want when you call and we will confirm what is possible with the brands and keyways involved.
Can I install a deadbolt myself, or should I call someone?
A confident DIYer can replace a deadbolt in an existing hole. New installations are harder, because a crooked or oversized bore on a door is difficult to undo. The strike plate and long screws are also where many homemade installs fall short. If you are unsure, call us and we will tell you honestly whether the job is worth doing yourself.
Do you handle smart deadbolts as well as standard ones?
Yes. We install keypad and connected deadbolts as well as conventional key-operated ones. The door prep is similar, but battery, connectivity and backup-key questions change the setup, so mention it when you call and we will plan the visit around it.
Can I get a deadbolt installed at night or on a weekend?
Our phone line is answered around the clock, every day of the year, at (213) 577-1366. Call, tell us about the door, and we will tell you what we can do and when. Timing is one of the factors in cost, so we will explain that up front.
More locksmith help in El Segundo
Deadbolt Installation near El Segundo
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.