Getting a key copied sounds like a trivial task — walk into a hardware store, hand over the key, pay $5, done. For a standard Kwikset or Schlage house key, that’s correct. But not every key copies that way, and not every copy cut from a kiosk actually works. Here’s what you should know about key duplication in San Diego before your next copy attempt.

The easy copies

These keys copy cleanly at almost any hardware store or Home Depot kiosk:

  • Kwikset KW1 (the most common San Diego residential key)
  • Schlage SC1 and SC4 (the second most common)
  • Master No. 3 padlock keys and similar
  • Basic office / desk keys (M22, 1284, etc.)

Expected cost: $3-$8 at Home Depot, $5-$10 at a local hardware store. Most copies take 2-3 minutes.

The harder copies — and where to get them

Some keys are harder to copy and either need a real locksmith or a specialized kiosk:

Car keys (transponder chip keys)

  • Where: mobile locksmith or dealer
  • Cost: $75-$150 for duplicates when you have a working key (cheaper than new-key programming from scratch)
  • Why not kiosk: kiosks can cut the physical shape but can’t clone the transponder chip that’s required to start the car

Duplicating when you still have one working key is always cheaper than requesting a brand-new key. If you only have one car key, get a duplicate made now while you still have the original.

Mailbox keys (USPS cluster boxes)

  • Where: mostly USPS only, or a locksmith with Arrow 21680 / 1172C blanks
  • Cost: USPS charges a flat fee (usually $50) and rekeys the whole cluster
  • Why not kiosk: the Arrow 21680 blank is a restricted keyway — kiosks don’t stock it and can’t cut it legally

If you’ve moved into a new home and the previous resident didn’t return the mailbox key, contact your local USPS office. They’ll re-issue for a fee.

High-security / restricted keyways (Medeco, Mul-T-Lock, Abloy)

  • Where: only from an authorized dealer of that specific system (us, for customers on file)
  • Cost: $25-$75 per copy
  • Why not kiosk: these keyways are patented — no one outside the authorized dealer can legally cut them

The design is intentional: restricted keyways prevent unauthorized key duplication, which is the entire point of installing them. To order a copy, the authorized key holder (the person on file when the system was installed) must request it with ID.

Filing-cabinet and unusual commercial keys

  • Where: locksmith
  • Cost: $10-$25 per copy
  • Why not kiosk: kiosks carry the top 20 most common blanks; commercial, equipment, and older keys require a wider blank inventory

Worn-out original keys

  • Where: locksmith
  • Why: kiosks duplicate the key mechanically — if your original is worn, the copy is worn too. A locksmith can “decode” the original and cut a fresh copy to the factory specifications, which works better than the worn original

When a kiosk copy doesn’t work

You’ve probably experienced this: you copy a key at Home Depot, get home, and the copy won’t turn the lock. This happens for predictable reasons:

The original was already worn

Kiosks duplicate mechanically — they trace your key and cut an identical copy. If your original had 5 years of wear, the copy has the same wear. Fix: have a locksmith decode and cut a fresh key.

The blank was slightly off

Kiosks stock generic blanks that approximate the original manufacturer’s key profile. Sometimes they’re 1-2mm off, which is enough that the copy catches in the cylinder. Fix: file the copy to match the original (risky) or have a locksmith cut a properly calibrated copy.

The kiosk machine was out of calibration

Self-service kiosks drift out of calibration over time. If the machine at your local store has been cutting bad copies, the next machine will be fine. Fix: try a different store or go to a locksmith.

The key was restricted

Some keys have “Do Not Duplicate” stamped on them. The stamp has no legal force — but on truly restricted keyways, the kiosk physically can’t cut it because they don’t have the blank. If a kiosk turns you away for this reason, you need the authorized dealer.

”Do Not Duplicate” stamps — what they actually mean

A key marked “Do Not Duplicate” on a standard keyway (Kwikset, Schlage, etc.) carries no legal weight. The stamp is a request, not a restriction. Any locksmith will duplicate it for the key holder with ID — and so will most hardware stores. The stamp is there because the property owner prefers not to have copies made; they can’t legally prevent the copy.

Genuinely restricted keys (Medeco, Mul-T-Lock) don’t need a “Do Not Duplicate” stamp — their patented keyway physically prevents unauthorized duplication.

Bulk duplication for landlords and small business

If you’re a landlord rekeying between tenants, or a small business issuing keys to new employees, bulk key cutting is common. A mobile locksmith can cut 10-50 keys on-site in under an hour for a flat rate, usually with a volume discount that beats hardware-store individual pricing.

Typical bulk pricing:

  • House keys (Kwikset / Schlage): $4-$6 each at volume of 10+, plus service call
  • Commercial restricted keyways: $15-$30 each at volume, plus authorized dealer verification

For rental property managers: consider a master-key system during rekey. A properly designed master-key system gives the property manager one key that opens every unit, while each tenant has a unique key that only opens their unit. Adds complexity at setup but eliminates the “I lost my spare, can I borrow yours?” scenario.

Tips for key longevity

A few habits that extend the life of your duplicate keys:

  • Keep duplicates on separate keychains from your primary. Don’t carry your only two house keys on the same ring where losing one loses both.
  • Don’t let duplicates sit in a pocket with loose coins. Coins grind the key teeth and accelerate wear.
  • Mark duplicates with colored caps (available at any hardware store for $2) so you can quickly identify house vs. car vs. office keys.
  • Retire worn keys before they break in the lock. A broken key inside a cylinder is a $120+ extraction plus replacement cost.

The photograph-your-key habit

Before any key leaves your possession (handing it to a landlord, leaving it at a locksmith, lending to a family member), photograph it. Include both sides, against a plain background, with a ruler or coin for scale. If you ever need a replacement and the original is lost, a good photo is enough for a locksmith to cut a working copy.

Need a key copied in San Diego? Swift Key San Diego does mobile key duplication for house keys, office keys, mailbox keys, restricted keyways, and transponder car keys. We come to you — save the hardware store trip. Call (858) 808-6055 for pricing on your specific key.