Lock Rekey vs Replace — Complete Guide for Highlands Ranch Homeowners

The 30-Second Answer

Rekey when: locks are in good working condition, hardware quality meets your security needs, you only need to invalidate old keys.

Replace when: locks are 15+ years old, hardware is damaged or worn, you need an upgrade in security grade or finish, or you want smart locks.

If you only read this far: most situations call for rekey, not replacement. The locksmith industry's incentive runs the other way (more revenue per job for replacements), which is why so much advice you read online recommends replacement when rekey would do.

What "Rekey" Actually Means

Rekeying replaces the internal pins in your existing lock cylinder so a new key works and old keys do not. The lock body itself, the deadbolt, the strike plate, the hardware finish, the door prep — all stay the same. A standard residential cylinder takes 5–15 minutes per cylinder to rekey.

Cost: $25–$40 per cylinder in Highlands Ranch (we charge $25 in our standard zone). Whole-home rekey for 4–6 cylinders typically $145–$245.

What you keep: existing locks, finish, door prep, hardware aesthetics, ANSI grade.

What you change: the keys.

What "Replace" Actually Means

Lock replacement removes the existing lock cylinder, deadbolt, strike, or full handleset and installs new hardware. New door prep may be required if upgrading from knob to lever or from cylindrical to mortise.

Cost: $145–$285 per door for a standard residential deadbolt + lever set. Smart lock $285–$485. High-security $385–$520. Whole-home replace 4–6 doors: $585–$1,485.

What you change: hardware, finish, mechanism, sometimes the keying type, possibly the brand, possibly the security grade.

When Rekey Is the Right Answer

• You just bought your home — previous owner, contractors, real estate agents may all have copies. Rekey costs $145–$245; replacement costs $585–$1,485 for the same security outcome (which is "the old keys do not work anymore").
• You ended a roommate or rental arrangement — same logic.
• You lost your keys — if you cannot account for where the keys are, rekey to invalidate.
• You want all doors keyed alike — rekeying lets us match all your locks to a single key, no replacement needed.
• Your locks are 5–15 years old, working fine — the hardware is good, you do not need a security upgrade, just a key change.

When Replacement Is the Right Answer

• Your locks are 15+ years old — pins, springs, and tolerances wear out. Past 15–20 years, even a perfect rekey will not last; the cylinder itself is fatigued.
• Your hardware is damaged — jammed deadbolts beyond repair, broken latch case housings from forced entry, severely corroded cylinders.
• You want to upgrade security grade — ANSI Grade 3 (residential builder-grade) to ANSI Grade 1 (commercial-strength) requires new hardware. Standard Kwikset to Medeco / Mul-T-Lock requires new cylinders.
• You want smart locks — Yale Assure, Schlage Encode, August, Kwikset Halo all require replacing the existing deadbolt with a new device.
• You hate the existing finish — if you bought a home with brass everything and want oil-rubbed bronze, that is a replacement decision, not a rekey decision.
• You want keyless entry across the board — rekey cannot give you that.

Common Confusion: "Rekey vs Lock Change"

These terms get used interchangeably and they should not. Rekey = internal pin change, same lock. Lock change = remove old lock, install new lock (same as "replace"). When a national locksmith dispatcher quotes you "lock change" for $200, they often mean rekey but charge replacement-level prices. Always ask: "Are you replacing the hardware or just rekeying it?" The answer determines fair pricing.

Decision Tree (Save This)

1. Are your locks under 15 years old AND working smoothly? If yes, REKEY. If no, continue.
2. Do you want to upgrade security grade or go smart? If yes, REPLACE. If no, continue.
3. Is the hardware physically damaged? If yes, REPLACE. If no, REKEY.

That is it. 90% of decisions are answered in three questions. The 10% that need more discussion: aesthetics (you want new finish), keying complexity (you want a master key system), and resale prep (some buyers want all-new hardware).

Get a Free Phone Consultation

Tell us your situation in 60 seconds and we will tell you honestly which option fits. We are not commissioned to upsell. Call (720) 299-9964.

Related Services

• House Rekeying Service — cost, process, scope
• Lock Change Service — full replacement details
• Lock Installation — new lock install on doors that did not have one
• High-Security Locks — Medeco, Mul-T-Lock, Schlage Primus
• Smart Lock Installation — Yale, Schlage Encode, August, Kwikset Halo
• Locksmith Pricing Guide — full pricing reference