Rekeying vs Replacing Locks: Cost, When and Why

Rekeying is almost always cheaper than replacing, typically $30 to $90 per barrel plus a callout against $120 to $350 per lock for full replacement. Rekey when the hardware is sound and you just want old keys cut out, replace when the locks are worn, damaged, or you want to step up to a higher security rating.

What is the actual difference

Rekeying leaves your existing lock body in the door and changes the internal pin arrangement, so every key that used to open it stops working and only new keys cut to the new pin combination will turn it. Replacing pulls the whole lock out and puts in a new one. Both end with keys you hold and old keys that do not work. The difference is what happens to the hardware, and that is what drives the price gap.

A locksmith working an average front door rekey is in and out in 15 to 20 minutes per barrel once they are on site. A full lock replacement, especially if you are upgrading to a different lock body or adding features like a keyless deadbolt, can run 30 to 45 minutes per door because there is more hardware to fit and the door prep sometimes needs adjusting.

Cost breakdown: rekey vs replace

These are typical Adelaide ranges, your quote may differ depending on lock brand, door count and access. A 3-door house rekey usually lands well under $250 all up including the callout. The same house with 3 new deadbolts fitted is more often $450 to $900, because you are paying for hardware as well as labour. If only 1 door needs attention and the rest are fine, most locksmiths will rekey the lot for consistency (so every door takes the same key) rather than leave you juggling 2 different keys.

When rekeying is the smarter choice

In the jobs we see across the Loudachris locksmith network, rekeying covers most of the common triggers. It is the right call when:

• You have just moved into a place and do not know how many copies of the keys exist.
• A housemate, ex-partner or tradesperson had a key and no longer should.
• The locks themselves are in good condition, no worn cylinders, no stiff action, no cracked housings.
• You want every door on the same key without buying new hardware.
• Budget is the deciding factor and the existing locks are not a security liability.

Rekeying is also the quicker fix after a lockout where a key was lost outside rather than stolen from inside the house, since the risk of someone using it against you is lower and speed usually matters more than a hardware upgrade.

When replacing is worth the extra cost

Replacement earns its higher price in a smaller but important set of cases. Go straight to replacement when:

• Break-in or attempted break-in: a lock that has been drilled, snapped or forced is compromised hardware, not just a key management problem.
• Worn or failing mechanism: if the key sticks, the deadbolt drags, or the cylinder is loose in the door, rekeying just moves the same tired mechanism onto a new pin set.
• Security upgrade: moving from a basic pin-tumbler to a restricted key system, higher-grade deadbolt, or keyless entry is a replacement job by definition.
• Mismatched or outdated hardware: if the front door has a different brand and finish to everything else, replacing brings the whole house onto one key and one look.

A rough rule that holds up across most Adelaide jobs: if the lock still operates smoothly and shows no damage, rekey it. If you are hesitating because something about the lock itself worries you, that hesitation is usually the answer, replace it.

Working out your own number

Every property is different: door count, lock brand, and whether you are mixing rekeys on some doors with replacements on others all move the total. Rather than guess, run your door count and situation through the rekey vs replace calculator for a side-by-side estimate of both paths before you commit to either. If rekeying is the right fit, the rekeying and lock changes page covers how the process works and what a locksmith needs from you on the day.

For a closer look at what a straight house rekey costs on its own, see the full cost to rekey a house in Adelaide, and if you are still unsure what rekeying actually involves mechanically, what is rekeying and how does it work breaks it down step by step.