Rekeying vs. Replacing Locks: A Bay Area Renter's Guide

What's the Difference Between Rekeying and Replacing a Lock?

Rekeying

Rekeying changes the internal pin configuration of an existing lock cylinder. A locksmith removes the cylinder, rearranges or replaces the pins so they match a new key cut, and reinstalls it. The hardware — the deadbolt body, the strike plate, the escutcheon — stays exactly as it is. The only thing that changes is which key opens it.

The result: every key that previously worked no longer does. Previous tenants, former roommates, contractors who still have a copy, none of them can get in anymore. New keys are cut to the new pin configuration and handed to you.

• Cost: Typically, $25–$50 per cylinder. A standard front door with a deadbolt and knob lock involves two cylinders, so expect $50–$100 for a complete front door rekey.
• Time: 15–30 minutes per door in most cases.
• Best for: Moving into a new place, after a key goes missing, post-break-in (if the hardware is undamaged), or routine security resets between tenancies.

Lock Replacement

Replacing a lock means removing the existing hardware entirely and installing new hardware in its place. This can range from swapping a deadbolt on an existing door prep to a full mortise lock replacement, a more involved job on older doors.

• Cost: Typically, $80–$200+ per lock depending on the hardware grade and door prep complexity.
• Time: 30–60 minutes per door, longer for older or non-standard preps.
• Best for: Hardware that's physically damaged (kicked in, drilled, forced), hardware that's worn out and no longer latches reliably, upgrading to a higher security grade, or switching to a smart lock platform.
  

What Does California Law Say?

Under California Civil Code Section 1942.5, landlords have habitability obligations and California courts have consistently interpreted these obligations to include rekeying rental units between tenancies. Put plainly: if you're a landlord in San Francisco, Oakland, or San Jose, rekeying when a tenant moves out isn't a courtesy, it's a legal baseline.



For tenants, California civil code and local rent ordinances give you the right to rekey your unit for security purposes without needing your landlord's prior approval, provided you give them a copy of the new key. San Francisco's Rent Ordinance is particularly explicit about this. If you've had a break-in, a domestic security concern, or a change in roommates, you don't need to wait for your landlord's sign-off to call a locksmith.

When Should a Bay Area Renter Rekey vs. Replace?

Rekey when:

• You just moved into a new apartment regardless of how nice the landlord seems or how clean the unit is, you have no way of knowing how many key copies exist
• A roommate moves out or a relationship ends and you need to change who has access
• You lost a key or had one stolen and can't confirm it won't be used
• You've moved into an older SF or Oakland building where the lock hardware is original and multiple tenancies have passed through
• Your landlord rekeyed the common areas but not your unit common in multi-unit buildings, the individual unit cylinder still needs its own rekey

Replace when:

• The lock was physically damaged in a break-in a compromised cylinder needs replacing, not just rekeying
• The deadbolt or knob lock is worn sticky to turn, not latching cleanly, or visibly damaged
• You're upgrading security grade from a standard Grade 3 deadbolt to an ANSI Grade 1 or a high-security cylinder
• You want to install a smart lock most smart lock platforms require removing the existing deadbolt and installing a new prep
• You're in a pre-1940 SF or Oakland building with original Corbin or Sargent mortise hardware that is too worn to rekey reliably
  

What About Smart Locks — Do They Need Rekeying?

Smart locks replace the rekeying process entirely, which is one of the main reasons they're popular with Bay Area landlords managing high-turnover rentals. Instead of calling a locksmith every time a tenant turns over, you change the access code remotely in seconds.

That said, installation isn't always straightforward. San Francisco's older Victorian and Edwardian housing stock — mortise lock preps, narrow door stiles, original Corbin and Sargent cylinder housings — requires specific knowledge to retrofit smart lock hardware without modifying the door. Not every smart lock model is compatible with every door prep, and choosing the wrong one can leave you with a lock that doesn't fit or a door that won't close cleanly.



If you're considering a smart lock upgrade for a rental property in any Bay Area market, a residential locksmith can assess your existing door prep and recommend compatible platforms before any hardware is ordered.

Getting Help Across the Bay Area

A-A Lock & Alarm Inc. provides residential locksmith services across all three markets, rekeying between tenancies, post-break-in upgrades, deadbolt installation, and smart lock setup.

In San Francisco, our residential locksmith team handles Victorian and Edwardian door hardware, California Civil Code rekeying between tenancies, and smart lock installation for condo buildings across every San Francisco neighborhood.

In Oakland, our residential locksmith team covers Rockridge, Temescal, Fruitvale, West Oakland, and the Oakland Hills, rekeying for the city's high-turnover rental market, post-break-in hardware upgrades, and smart lock installation across single-family homes and multi-family buildings.

In San Jose, our residential locksmith team serves Willow Glen, Almaden Valley, Rose Garden, Berryessa, and all surrounding neighborhoods, with a physical shop at 1245 The Alameda for same-day key cutting and in-shop rekeying alongside our mobile service.

Whether it's a simple rekey after moving in or a full hardware upgrade following a break-in, A-A Lock & Alarm Inc. assesses your situation first and recommends the most cost-effective fix, no upselling, no unnecessary replacement.

Call (800) 422-5625 for same-day residential locksmith service across San Francisco, Oakland, and San Jose.