Why does a San Gabriel door need a proper deadbolt?
A spring latch in a doorknob is built to keep a door closed, not to keep a person out. A deadbolt is different. When it is thrown, a solid steel bolt sits in the door frame and does not retract unless the cylinder turns or the thumbturn is operated. That is the whole idea, and it is why a deadbolt is the first thing we recommend adding to an entry door that only has a knob lock.
Most calls we get about deadbolt installation fall into a few situations. A door never had one. An old one is worn and the bolt drags or sticks. A door was kicked or pried and the lock is damaged. Someone moved in and wants a deadbolt they know no one else holds a key to. Or a homeowner wants a second lock at a back or side door that gets less attention than the front.
This page covers installing a new deadbolt and replacing an existing one, including double-cylinder models. If your situation is really a different problem, such as a lock that only needs its keys changed, we will tell you so rather than sell you hardware you do not need.
Single-cylinder or double-cylinder: which deadbolt should you install?
A single-cylinder deadbolt takes a key on the outside and has a thumbturn on the inside. It is the standard choice for nearly every house and apartment entry door, and it is what we install most often. You can leave in a hurry without hunting for a key, and so can everyone else in the home.
A double-cylinder deadbolt takes a key on both sides. People ask for double cylinder deadbolt installation when a door has glass in it or right beside it. With a single-cylinder lock, someone who breaks the glass can reach in and turn the thumbturn. With a keyed inside cylinder, they cannot, unless they also find the key.
The tradeoff is real and we explain it plainly. If there is a fire or another emergency and the key is not in the inside cylinder, you may not be able to get out quickly. Some building and fire codes restrict double-cylinder locks on certain doors, particularly in rental and multi-unit housing. If you rent, check with your landlord or property manager before you ask for one. If you own the home, we will talk through where the key will live, usually on a hook or a high shelf near the door, and whether a different solution fits better, such as a single-cylinder lock paired with a security film on the glass or a door with no glass in reach.
- Single-cylinder: key outside, thumbturn inside. Best for most entry doors.
- Double-cylinder: key on both sides. Considered for doors with glass within arm's reach of the lock.
- Keep the inside key somewhere every adult in the home can find fast, never in a pocket or a drawer across the house.
- If you are a tenant, ask before installing a double-cylinder lock. Some properties are not permitted to have them.
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We answer around the clock, every day of the year.
Call (213) 577-1366How does our deadbolt installation work, step by step?
Whether we are adding a deadbolt to a bare door or swapping out an old one, the sequence is much the same. Doing it in order is what keeps the lock from binding six months later. If you want to see how this fits into our broader work, our lock installation service page covers the other hardware we fit.
- You call (213) 577-1366 and tell us about the door: wood, metal or fiberglass, whether there is already a bolt, and whether there is glass nearby. Someone answers at any hour.
- We look at the door in person. We check the thickness, the condition of the edge, the frame, and whether the door closes squarely before we touch a drill.
- We confirm the hardware with you: single or double cylinder, finish, and the grade of lock suited to the door and your situation.
- For a new lock, we mark and drill the face bore and the edge bore using the correct size for a standard residential deadbolt. For a replacement, we remove the old lock and check that the existing holes are clean and correctly sized.
- We fit the latch into the door edge, mount the cylinder and interior assembly, and set the backset so the bolt lines up with the frame.
- We install the strike plate in the frame, chisel the mortise to fit, and use long screws that reach into the stud behind the jamb, not just the thin trim.
- We test the lock repeatedly with the door open and closed. The bolt should extend fully and retract smoothly without lifting or pushing the door.
- We hand you the keys, show you how the lock works, and note any door or frame issues we found that you may want to address.
What affects the cost of deadbolt installation in San Gabriel?
We do not quote prices on a web page, because an honest number depends on the door in front of us. What we can do is tell you exactly what moves the cost up or down, so nothing surprises you when we give you a figure on the phone or on site.
The biggest variable is whether the door is already prepared. Replacing an existing deadbolt usually means the holes are there, and the work is faster. Adding a deadbolt to a door that has never had one means boring new holes, which takes more time and more care, and the usually more economical route is often to replace in place if a bolt is already there.
Hardware matters next. A basic residential deadbolt and a higher-grade lock with a hardened strike, anti-drill features or a restricted keyway are different products. Double-cylinder models and special finishes also change the total.
Door condition counts. A warped, cracked or hollow door can need repair before any lock will sit properly. A frame with split wood around the strike may need reinforcing. If we are installing several locks at once and keying them alike, that affects the work too.
Timing and location play a part. After-hours and emergency calls cost differently from scheduled daytime work, and San Gabriel sits about 22 miles from our Westwood base, which we factor in when we scope the trip. We tell you the full picture before we start, and we do not begin work you have not agreed to.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Deadbolt replacement, rekey or repair: which do you actually need?
Not every unhappy deadbolt needs to come out. We try to match the fix to the problem, because the lighter-cost option is sometimes the right one.
If the lock works well and feels solid but you are worried about who has keys, rekeying the lock changes the internal pins so old keys stop working. The hardware stays, and you get a fresh key set. This is a common choice after buying a home or ending a tenancy.
If the bolt sticks, the key turns stiffly, or the lock has loosened on the door, a lock repair may be enough. Sometimes the problem is just an out-of-line strike plate or a loose set of screws, and fixing that costs far less than new hardware.
Deadbolt replacement makes sense when the lock is worn out, damaged by a break-in attempt, a low-grade model that does not suit the door, or simply mismatched with the rest of your hardware. It also makes sense when you want to upgrade to something stronger or more modern. If you are weighing a higher level of protection, our high-security lock options are worth a look, and if you want keyless entry, see smart lock installation.
What should you look for in a deadbolt itself?
Deadbolts are graded under an ANSI/BHMA standard, with Grade 1 the most robust, Grade 2 in the middle and Grade 3 the lightest residential rating. For an exterior entry door, we lean toward a higher grade, because the grade reflects how much abuse the bolt, latch and cylinder can take.
The bolt itself should extend a full inch into the frame for a solid hold. Look for a hardened steel bolt, a reinforced strike plate, and a cylinder that resists drilling and picking. The strike plate is as important as the lock. A strong deadbolt held by a plate fastened with short screws into a thin jamb will fail at the frame, not at the lock.
Finish is a matter of taste, and we can match the look of your existing handle set. Keyway matters too. If you want your deadbolt and your doorknob to open with one key, we can arrange that. Tell us at the start, because it changes which lock we choose.
- Choose a higher grade for exterior doors.
- Ask about the strike plate and screw length, not only the lock body.
- Decide up front if you want one key for several locks.
- Match the lock to the door: a hollow or damaged door may need repair first.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Deadbolts across San Gabriel: older homes, apartments and summer heat
San Gabriel is not one kind of housing, and the right deadbolt job changes from block to block. In the Mission District, where some of the city's oldest houses stand, original mid-century locksets are common. We often find a worn knob lock and no deadbolt at all, or a bolt that was added decades ago and never aligned well. Adding a deadbolt there frequently pairs with rekeying the older hardware so a single key set works across the house.
In North San Gabriel near the San Marino border, the homes are larger prewar and ranch houses on generous lots. Those homes usually have several exterior doors, such as a front entry, a kitchen door, a side gate door and a garage access door. A deadbolt on every one is a sensible plan, and it is worth keying them alike so you are not carrying a ring of keys.
Along Del Mar Avenue and Valley Boulevard, the housing is denser: postwar apartments, condo complexes and newer townhome infill. In ZIP codes 91775 and 91776, a tenant who has just moved into a Del Mar Avenue unit may want a fresh deadbolt, though we always suggest confirming with the landlord or property manager first, since building rules and fire codes can limit what is allowed. Condo owners in the complexes off Las Tunas Drive often have more freedom to choose, though HOA rules can apply to exterior-facing hardware.
One local issue is worth knowing. San Gabriel's hot, dry summers can make wood doors swell, particularly in older housing. A deadbolt that slides easily in March may drag or refuse to throw in August because the door has moved slightly against the frame. That is a routine seasonal problem, not a defect in the lock. When we install, we leave correct clearance and check alignment so the bolt works across the year, and if the door itself is the issue, we say so.
If you are not sure which neighborhood quirks apply to you, our main San Gabriel page gives an overview of the services we offer here.
Why call Wilshire Lock & Key for deadbolt work?
We have been in business since 1987, and this is simple work that is easy to do badly. We would rather you know what separates the two than just trust us.
We are one company. When you call (213) 577-1366, you reach us, not a dispatch center that sells your job to whoever is free. We run a storefront at 10740 Wilshire Blvd in Westwood and mobile service vans, so work is done by our own technicians, and David, the owner and lead technician, oversees how we do it. Our mobile locksmith service brings the tools to your door, so you do not need to take anything off its hinges and drive it across town.
Phones are answered 24 hours a day, 7 days a week, year-round. If a break-in attempt has left your door damaged tonight, our emergency locksmith service is how we handle it. We secure the opening first and talk about a permanent deadbolt when you are ready.
Property managers with several units can see our locksmith for landlords page. It explains how we handle rekeying and hardware across a building.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366What should you ask any locksmith before they start?
California requires locksmith companies to hold a license from the Bureau of Security and Investigative Services (BSIS), called a Locksmith Company (LCO) license. Ask any locksmith for their license number before work begins, and check it with BSIS if you want to be sure. A reputable company will give it to you without hesitation.
Beyond that, ask for a clear explanation of what the work will involve and what could change the total before anyone picks up a drill. Ask what grade of deadbolt they intend to use. Be cautious of any company that gives a very low figure over the phone and then changes it on your porch. We will tell you plainly what we see, what we recommend, and why.
Frequently asked questions
Can you install a deadbolt on a door that does not have one?
Yes. We check that the door is thick enough and in good condition, then drill the face and edge holes, fit the bolt, and set the strike plate in the frame. Adding a bolt to a bare door takes more work than replacing an existing one, and the cost reflects that. We explain it before we begin.
Is a double-cylinder deadbolt a good idea for my home?
It can be, if the door has glass within reach of the thumbturn. The risk is that you need a key to leave from the inside, which can be a problem in a fire. Some codes restrict them, especially in rentals and multi-unit buildings. We discuss where the key will be kept before installing one.
Can I install a double-cylinder deadbolt in my San Gabriel apartment?
Check with your landlord or property manager first. Building rules and fire codes may limit them in apartments and condos. If it is not allowed, we can suggest a single-cylinder lock with a reinforced strike plate, or other options for a door with glass.
How long does deadbolt installation take?
A straightforward replacement on a prepared door is usually a short visit. A new installation takes longer because we bore new holes, and a door or frame that needs repair takes longer again. We give you a realistic picture on the phone and confirm it once we see the door.
Should I replace my deadbolt or just rekey it?
If the lock is solid and works well, rekeying is often the more economical route and changes who can open it. If the lock is worn, damaged, low-grade or does not match the door, replacement is the better choice. We look at the lock and tell you honestly which one fits.
Why does my deadbolt stick in the summer?
In San Gabriel's hot, dry summers, a wood door can swell slightly and press against the frame, so the bolt no longer lines up with the strike plate. The fix is usually adjusting the strike or the door, not replacing the lock. We check alignment during installation so it works year-round.
Can all my locks be keyed to the same key?
In most cases, yes. We can install deadbolts keyed to match your existing locks, or key several new ones alike. Tell us at the start so we pick compatible hardware, which is especially useful for larger homes with several exterior doors.
Do you install deadbolts at night or on weekends?
Yes. Our phone at (213) 577-1366 is answered 24 hours a day, 7 days a week, year-round. If your door has been damaged and cannot be locked, call us and we will secure it first, then plan the permanent deadbolt.
Should I ask for your license number?
You should ask any locksmith for theirs. California requires locksmith companies to hold a BSIS Locksmith Company (LCO) license. Ask for the number before work starts, and verify it with BSIS if you wish.
More locksmith help in San Gabriel
Deadbolt Installation near San Gabriel
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.
