What key duplication actually involves
A key copy looks like the simplest job a locksmith does, and it is, but only when it's done carefully. A key works because a series of small cuts line up pins inside your lock to exact heights. If a copy is off by a hair, it may still slide in, but it will drag, stick, or wear out the cylinder faster than it should. Anyone who has fought a spare that only turns if you jiggle it knows the feeling.
We cut duplicate keys for house doors, duplicate deadbolt keys, apartment and condo doors, office and commercial doors, mailboxes, padlocks, and a range of high-security and restricted keyways. The goal is the same each time: a spare that turns as smoothly as the original, the first time you try it, not after you've filed it down in the driveway.
The most common reason people call us for a copy is not a lockout. It is a quiet, practical problem: a teenager needs a key, a dog walker needs access, a second car or second home is in the picture, or the one house key everyone shares has gone fuzzy from years of use. Getting spares made before something goes wrong is cheaper in time and stress than getting them made after.
How do we copy a key in Diamond Bar?
Here is how a typical duplication job goes, whether it happens at our Westwood storefront at 10740 Wilshire Blvd or with one of our mobile service vans. The steps are simple, but the order matters.
- We look at the key first. Brand, keyway, wear, and any stamped markings tell us what we're dealing with and whether it can be copied freely.
- We check the blank. Using the correct blank for that specific keyway matters more than most people realize. A near-match blank is a common cause of bad copies.
- We cut the copy, ideally from the original rather than from another copy. Copies of copies pick up small errors that add up.
- We deburr and clean the key so it doesn't shed metal shavings into your lock.
- We test it in the lock when we can. A key that looks perfect on the machine still has to prove itself in the cylinder.
- If the original is badly worn, we tell you. Sometimes the right move is to cut a fresh key by the lock's code or by decoding the lock itself rather than copying a tired key.
Which keys can we duplicate?
Most keys are straightforward. A few categories have rules, and we would rather explain them up front than surprise you at the counter.
- House keys and spare house keys, including standard pin-tumbler keys for entry knobs and handlesets.
- Duplicate deadbolt keys, which are often a different keyway from your knob lock, so bring the one that actually fits the deadbolt.
- Apartment key copy requests, subject to your lease and building rules. If your building manager controls the keys, check with them first.
- Office key duplication and commercial key duplication for shop doors, back offices, filing cabinets, and storage rooms.
- Mailbox key duplication for private and HOA-managed mailboxes. Locks owned and controlled by the postal service are a separate matter, and those keys are generally handled through the post office rather than a locksmith.
- High security key duplication and restricted key duplication, covered in the next section because they work differently.
- Padlock, cabinet, and toolbox keys, which are usually quick but sometimes need a less common blank.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366What about high-security and restricted keys?
Some keys are built so they can't be copied at just any hardware counter. High-security keys often have unusual cuts, side milling, or extra security features. Restricted keyways go further: the manufacturer or system owner controls who can authorize more keys, often with a card, a registered account, or a signature from the person who bought the system.
We will not pretend that restriction doesn't exist. If your key is part of a restricted system, we will ask what we need to verify, and some copies may only be possible with the right authorization. In some cases the honest answer is that the manufacturer or a dealer has to be involved, and we will tell you that plainly rather than leave you waiting.
The words Do Not Duplicate stamped on a key are not a lock in themselves. They are a request, and plenty of shops ignore them. We take authorization seriously because a copied key to someone else's property is a real risk. If you want genuine control over who can copy your keys, the better answer is usually a restricted system. We cover that in more detail on our high-security locks page.
How much does key duplication cost in Diamond Bar?
We don't quote numbers on a web page, because honest key pricing depends on what's in your hand. Here is what moves the cost, so you know what to expect when you call (213) 577-1366.
The type of key matters most. A common brass house key is the simple end of the range. Restricted, high-security, and dimple or laser-cut keys need specialized blanks and equipment, and they cost more to produce.
Quantity matters too. Several copies cut in one visit are usually the more economical route than coming back repeatedly.
Where the work happens also plays a part. Coming to our storefront is the lighter-cost option when you can manage it. Having a mobile van come to Diamond Bar adds travel and service time to the job, which is a real cost, and we will explain it before we begin.
Finally, the condition of the original matters. If your key is so worn that copying it would produce a bad spare, the better fix may be cutting from the lock, and that takes more work. We would rather tell you that than sell you a copy that won't work.
Can you duplicate keys at my home or business?
Yes, in many cases. Our mobile service vans can come to you, which is useful when you can't leave a building unattended, when you need keys cut for a whole set of doors, or when you simply don't want to drive across town. Our mobile locksmith service covers the details of how a van visit works.
Being honest about limits: depending on the key, we may cut it on site or take it back to the shop for a cleaner cut on the right machine. Some specialty keys need equipment that is best used at the storefront. We will tell you which applies before we begin, not halfway through. Diamond Bar is about 42 miles from our base, which is why it helps to call first so we can plan the visit sensibly.
If you're locked out and need a key made as part of getting back in, that's a different job with a different priority. See our house lockout page for how we handle that.
Locked out or need a locksmith now?
We answer around the clock, every day of the year.
Call (213) 577-1366Key duplication around Diamond Bar: what we see locally
Diamond Bar was master-planned from the 1960s onward, so a lot of the housing is 1960s to 1980s hillside tract homes, with condo and townhome clusters along Golden Springs Drive and Diamond Bar Boulevard. That mix shapes the key requests we expect in 91765.
In the townhome and condo clusters along the Golden Springs Drive corridor, HOA management is common, and with it comes a familiar pattern: one set of keys per unit that has been copied, shared, and recopied through several owners and tenants. If you've bought or rented in a complex like that, a fresh original cut from the lock, or a rekey, can be smarter than another copy of an old key whose history you don't know.
In the guard-gated Country Estates, large custom homes on estate lots often carry higher-grade hardware, including gates and other high-security locks. Those keys frequently fall into the restricted category, so copying may involve authorization steps, and we'd want to see the key and confirm before promising anything.
Around Diamond Point, the Summitridge area, and South Pointe, the tract homes tend to share the same pattern of keys being shared around a family and passed along. Kids, relatives, and house sitters all end up with copies, and most people have never made a fresh original set in decades.
The climate adds a small but real factor. Diamond Bar sits in the inland hills, with hot summers and wind funneling through Brea and Tonner Canyons. Heat can make doors swell and bind, and dust collects in exterior keyways. A key that seems to be wearing out may really be a dirty or tight lock, and a fresh copy of a worn key into a dusty cylinder will not improve anything. We check the lock as well as the key.
For businesses, the shopping centers along Diamond Bar Boulevard and Grand Avenue generate steady commercial key requests: back-door keys, stockroom keys, keys for staff turnover. If you have a multi-door setup and want to control who can open what, a master key system is a better foundation than a pile of loose copies.
Mailbox keys, spare keys, and car keys: where the lines are
Mailbox key duplication is a common small request. Many private and HOA mailboxes use simple cylinder locks that cut easily. If the lock is damaged, or the original key is missing entirely, copying is not the answer and a mailbox lock replacement is.
Car keys are a different category. Many modern car keys contain a transponder chip or have a remote built in, and cutting the metal part is only half the job. We handle those under our automotive services, and for modern vehicles we confirm the key type by VIN or in person before we say what is possible, since not every key is the same. If that's what you need, see car key replacement.
If a key has snapped in the lock and you need a copy, the first job is getting the broken piece out. Our broken key extraction page covers that, and we can cut a new key afterward.
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
We have been in business since 1987, and that time at the bench shows up in small ways: we recognize unusual keyways, we know which blanks tend to cause trouble, and we can tell when a key shouldn't be copied at all. We run a real storefront in Westwood at 10740 Wilshire Blvd along with mobile service vans, so you can drop in or have us come to you.
We are one company. When you call (213) 577-1366, you are not routed through a dispatch middleman who hands the job to whoever is closest. The phone is answered 24 hours a day, 7 days a week, year-round. David, the owner and lead technician, oversees the work.
One more point worth making. California requires locksmith companies to hold a BSIS locksmith company license (known as an LCO license), and you should ask any locksmith for their license number before they work on your property. That is good advice for key work too, because copying keys is a matter of trust. Ask us any questions you like about how we work.
When a copy is not the right fix
Sometimes the honest recommendation is not to duplicate. If you've lost a key and don't know who might have it, another copy of the remaining key leaves the risk in place. If you've moved into a place where former occupants may still have keys, cutting more copies just adds to the pile. In both cases, rekeying changes the lock so old keys stop working, and it is usually the more economical route compared with replacing hardware.
If you're locked out of a smart or electronic lock, or you're considering moving away from physical keys altogether, that's a conversation about smart lock installation rather than duplication, but we're happy to talk it through.
Whatever you need, call (213) 577-1366. Tell us the lock, the key, and what you're trying to accomplish, and we'll tell you honestly whether copying is the right step.
Frequently asked questions
Can you copy a key if I don't have the original?
Often yes, but not by copying. If the lock is available, we can cut a key from the lock itself by decoding it. This takes more work than copying an existing key, and the details depend on the lock type. Call (213) 577-1366 and describe the lock.
Can you duplicate a key marked Do Not Duplicate?
That stamp is a request, not a physical lock, and we don't ignore it. Where a key belongs to a restricted system, we ask for authorization first. If you're the owner, tell us and we'll explain what's needed. If the key isn't yours to copy, we won't cut it.
Do you make spare house keys at my home in Diamond Bar?
In many cases we can, using our mobile service vans. Depending on the key, we may cut it on site or take it back to the storefront for a better cut. We'll tell you which applies when you call, before any work begins.
Can you copy a high-security or restricted key?
Sometimes. High-security keys need the right blank and equipment. Restricted keys also need authorization from the system owner or manufacturer. We confirm what applies to your specific key in person or by phone before promising anything, and we'll say plainly if a dealer must be involved.
Can I get an apartment key copy without telling my landlord?
That depends on your lease and the building's rules. Many buildings control their keys, and some have restricted systems. Check your lease or ask your property manager first. If you are the manager, our landlord services may help with a more organized key setup.
Do you duplicate mailbox keys?
Yes, for private and HOA-managed mailboxes that use standard cylinder locks. Locks controlled by the postal service are generally handled through the post office, not a locksmith. If your mailbox lock is broken or the key is lost entirely, replacing the lock is usually the better fix.
Why does my new copy stick or not turn?
Usually the cut is slightly off, the blank is the wrong one, or burrs were left on the key. Dust in the keyway or a door that has swelled in the heat can also cause a stiff turn, and that's a lock issue rather than a key issue. Bring the key and the lock details and we'll check both.
Can you duplicate office and commercial keys?
Yes. We cut office, storeroom, and shop keys regularly. If you have a lot of doors or many employees, we may suggest a master key system so you have control over who opens what, instead of a growing pile of loose copies.
Do I need to call ahead for key duplication?
It helps. Our phone at (213) 577-1366 is answered 24/7, and a quick call lets us confirm the key type and whether it can be copied, so you don't make a trip for a key that needs special handling.
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Reviewed by David, Owner & Lead Technician, Wilshire Lock & Key — in the locksmith trade since 1987.
Last updated 2026-10-11.