Why does a Covina door need a new deadbolt?
Most people call us about a deadbolt for one of a handful of reasons. They moved in and the door has only a knob lock. The existing deadbolt is worn out, sticks, or needs a lift of the door to turn. Someone has a key they shouldn't. A break-in attempt left the door frame cracked. Or the home is simply being upgraded and the old hardware is not up to the job anymore.
A deadbolt is the part of your door that does the real security work. A spring latch in a knob can often be pushed back with a thin tool or a bit of force. A deadbolt has no spring in the bolt. It only moves when the cylinder turns, and when it is thrown into a solid strike, it holds the door in the frame. That only works if the bolt is a decent one, the hole is cut cleanly, and the strike is anchored into something stronger than a strip of trim.
That last point is where most do-it-yourself installs and rushed jobs fall short. A good bolt on a badly aligned door drags, rubs, and gets left unlocked because it is a hassle. We install deadbolts so that they are easy enough to use every day, because a lock you actually use protects you more than a stronger one you skip.
Single or double cylinder: which deadbolt fits your door?
The cylinder is the part you put the key in. A single-cylinder deadbolt has a key on the outside and a thumb-turn on the inside. A double-cylinder deadbolt takes a key on both sides. When customers search for double cylinder deadbolt installation, they are usually worried about someone breaking a nearby window or glass panel and reaching in to turn a thumb-turn.
That is a real concern, and a double-cylinder bolt does address it. The trade-off is just as real: in a fire or emergency, you need to find a key to get out. If a key is not in the lock or kept right beside the door, you can lose seconds you do not have. We tell customers this plainly and let them make the call. Some points we go over with you:
- Single cylinder is the right choice for most solid doors with no glass nearby. It is quick to operate from inside, which matters for family members, guests, and anyone leaving in a hurry.
- Double cylinder makes sense when there is glass within arm's reach of the thumb-turn, such as a sidelight, a door with a glass panel, or a small window beside the frame.
- Double cylinder is a poor fit where several people live and not everyone will know where the key is kept. Rental units are the clearest example, and building and fire rules can limit their use. Check the rules that apply to your property before choosing one.
- If glass is the only reason you are considering a double cylinder, there are sometimes alternatives, such as reinforcing or replacing the glass, or moving the thumb-turn out of reach. We can talk through those on the phone or at the door.
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Call (213) 577-1366How we install or replace a deadbolt, step by step
Whether it is a new deadbolt installation on a door with no bolt or a deadbolt replacement where an old one is coming out, the process is the same in outline. Here is how a typical job goes.
The work is quick when the door is in good shape. It takes longer when the door needs repair first, and we will tell you that before we start rather than halfway through.
- 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 beside it. Photos help but are not required.
- We look at the door in person, checking its thickness, the existing holes, the frame condition, and how the door sits when closed.
- We talk through hardware with you: single or double cylinder, finish, grade, and whether you want it keyed to match other locks on the property.
- If a bolt is coming out, we remove it and check the bore holes for damage or oversize cuts. If the door is new to a deadbolt, we mark and cut the holes with the proper tools, not a guess.
- We fit the bolt, set the correct backset, and install the strike with long screws that reach into the framing, not just the thin jamb.
- We test it with the door open, then closed, then repeatedly with the key and the thumb-turn. The bolt should throw fully with no lifting, pushing, or pulling.
- We hand over the keys and show you how to use them. If you want other locks rekeyed to the same key, we can arrange that too.
What affects the cost of deadbolt installation in Covina?
We do not quote prices on a web page, because the honest answer depends on your door. What we can do is tell you what moves the cost, so a phone quote makes sense when you hear it.
- Hardware grade and brand. Basic residential deadbolts, mid-range ones, and high-security models differ in materials, internal parts, and pick or drill resistance.
- New installation versus replacement. Swapping a bolt into existing holes is usually the lighter-cost job. Cutting new holes in a door that never had one takes more time and care.
- Door condition. Cracked wood, oversize or off-center holes, and loose or split frames may need repair or reinforcement before the bolt can hold.
- Number of doors and keying. Several doors keyed alike take more work than a single door.
- Cylinder type. Single and double cylinder hardware are not priced the same.
- When you call. Service at night, on a weekend, or on a holiday is different from a daytime appointment, and we will say so when you ask.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Grades, strikes and the details that make a deadbolt hold
Not every deadbolt on a hardware-store shelf is equal. Residential bolts are commonly graded, with the top grade built from heavier materials and tested against more force. A higher grade does not help much if the bolt sits in a weak frame, so we look at the whole door, not just the lock.
The strike plate is the small metal piece on the frame that receives the bolt, and it is often the first thing to fail. A short-screw strike pulls out of a thin jamb under force. We use longer screws that bite into the stud behind the jamb, and where the frame is soft or split, we repair or reinforce it.
If you are after something stronger than a standard bolt, our high-security locks page explains the options, including pick-resistant cylinders and restricted keyways. If you want keypad or app-based entry rather than a traditional key, see smart lock installation. Those are different jobs from a standard deadbolt, and we will not push you toward them if a plain bolt serves you better.
Deadbolts around Covina: downtown, Covina Hills, and Arrow Highway
Covina is a mix of housing, and the right deadbolt job changes with the building. We serve addresses across ZIP codes 91722, 91723 and 91724. Our storefront is on Wilshire Boulevard in Westwood, about 32 miles away, and our mobile vans come to you in Covina.
Near the Citrus Avenue district of Downtown Covina, older Craftsman-era and early-20th-century homes remain. These doors can be old solid wood, sometimes with decades of paint, previous lock holes, or an older mortise lock inside. A hardware upgrade on one of these doors is a careful job. We check what is already bored into the door before cutting anything, and we aim to add a deadbolt without wrecking original woodwork. Covina's hot, dry summers matter here too. Heat can make older wood doors swell and bind seasonally, so a bolt that lined up in winter may rub in August. We set the bolt and strike with that in mind, and if the door itself is the problem, we will tell you.
In the 1950s and 1960s ranch tracts, many front doors are plain and practical, and a replacement deadbolt is often the simplest upgrade. In Covina Hills, larger semi-rural lots often have gated driveways. The house doors still need solid deadbolts, and the gate is a different question. For gates, see our page on gate lock repair.
Along the Arrow Highway corridor, apartment complexes line the street, and the same goes for parts of Azusa Avenue. In a rental, deadbolt work is usually about changing or adding hardware between tenants. Single cylinder is the usual choice, because several people may live in a unit and double-cylinder bolts can create egress problems. If you manage units, our locksmith for landlords page covers how we work with property owners. We also serve Charter Oak, the adjacent unincorporated area with Covina addresses.
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 among the most common jobs in this trade. When you call (213) 577-1366, you reach a company with a real storefront at 10740 Wilshire Blvd and our own mobile vans, not a call center sending your address to whoever picks up the job. One company handles your call and your work, with no dispatch middlemen in between.
David, our owner and lead technician, oversees the work. That matters on a job like this, where the difference between a bolt that works for years and one that sticks by next summer comes down to measurement and alignment.
We answer the phone 24 hours a day, 7 days a week, year-round. If a deadbolt fails at night, or you are locked out and need a new bolt right away, call. For lockouts specifically, see house lockout. For a mobile visit with the right tools on the van, see mobile locksmith.
What should you ask any locksmith before they install a deadbolt?
California requires locksmith companies to hold a BSIS LCO license, issued through the Bureau of Security and Investigative Services. Ask any locksmith you are thinking of hiring for it, including us, and check it with the state. It is a fair question and a good company will not mind answering.
A few other questions are worth asking. Will the work be done by the person who comes to your door, or subcontracted? Will they check the frame and strike, or just swap the lock? If they have to cut new holes, will they explain what they are doing first? Will they tell you what is not worth doing? A locksmith who will not answer these on the phone is one to be careful with.
If your real need is changing which keys work rather than replacing the bolt itself, lock rekeying may be the more economical route. For broader hardware jobs on a new door or frame, see lock installation. If a deadbolt is only part of the plan, we can walk you through the order that makes sense.
Frequently asked questions
Can you install a deadbolt on a door that does not have one?
Yes, in most cases. We check the door's thickness, material, and edge first, then cut the holes with the proper tools. Very thin, hollow, or damaged doors may need reinforcement or may not be a good candidate, and we will tell you before we start.
What is the difference between deadbolt installation and deadbolt replacement?
Installation usually means adding a deadbolt where there is none, which involves cutting new holes. Replacement means taking out an existing bolt and fitting a new one, often into the same holes. Replacement is usually the lighter-cost job, though a damaged door or frame can change that.
Is a double cylinder deadbolt a good idea?
It can be, when there is glass within reach of the interior thumb-turn. The downside is that you need a key to get out, which can be dangerous in a fire. It is a poor fit for rentals and homes where several people need quick exit. We will go over your door and explain the trade-off.
Do you install double cylinder deadbolts in rental units?
We can install what the owner asks for, but we usually recommend single cylinder for apartments and rentals because of emergency exit concerns, and building and fire rules can limit double-cylinder use. Check the rules that apply to your property before ordering one.
Will a new deadbolt work with my existing keys?
Often it can. A new bolt can be keyed to match other locks, or you can choose new keys for the whole set. Tell us what you want when you call, and we will plan the hardware around it. If you only want to change which keys work, rekeying may be the better route.
My deadbolt sticks in the summer. Do I need a new one?
Not necessarily. In Covina's hot, dry weather, wood doors can swell and shift, which pulls the bolt out of line with the strike. Sometimes the fix is adjusting the strike or door, not replacing the lock. We look at it before recommending a new bolt.
Can you replace a deadbolt on an older Craftsman-style door?
Yes, but we are careful. Older doors may have previous lock holes, thick paint, or a mortise lock inside. We inspect the door before cutting anything and aim to upgrade the hardware without damaging original woodwork.
Can you come out at night for a deadbolt?
Yes. We answer the phone 24 hours a day, 7 days a week, at (213) 577-1366. If your door cannot be secured, call and we will talk through the situation and what to do next.
How do I know a locksmith is legitimate?
California requires locksmith companies to hold a BSIS LCO license. Ask for the number and verify it with the state. Also ask who will do the work and whether they will check the frame and strike, not just swap the lock.
More locksmith help in Covina
Deadbolt Installation near Covina
Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.
