Tenant Moved Out? Change Codes, Not Locks

When a tenant moves out, the risk leaves with every key copy you cannot count. Instead of rekeying the same keyed lock again, read the bolt on the door edge, confirm the backset, and when the existing mortise footprint matches, reset one shared code so the next tenant starts clean.

Quick Answer: the verdict before you order anything

If this is your door…	Verdict
Tenant left and the key copies out there are unknown	Change the code — do not rekey the same uncertainty back in
Door edge carries a swinging deadbolt or hookbolt at handle height	SK1850 line — one shared code, and the next tenant starts clean
Door latches itself shut, with a push paddle inside	SK4510 line — the deadlatch version of the same turnover routine
New tenant starts this week	Photograph and measure first — backset decides fit before move-in day

Walter's turnover weekend: two doors, one old habit

Walter owns a four-unit strip plaza. His barbershop tenant moved out on Saturday at 6:00 PM and handed back two keys with a smile — plus the honest admission that a cousin and a former chair-renter had “borrowed copies at some point.” At 9:00 AM on Sunday, Walter stood in the empty unit doing the math landlords always do: rekey this door for the incoming nail studio, rekey the deadlatch door on the unit next door when that tenant turns over in spring, and start the whole copy problem again with each new lease. His old habit was a locksmith invoice per turnover. That Sunday he changed the question instead: not “how fast can this lock be rekeyed,” but “why does turnover still run on copies nobody can count?” By Monday at 8:00 AM, before the new tenant's first delivery arrived, he had read both doors, photographed both edges, and planned the change once — properly.

Why rekeying repeats the same problem

A rekey resets the pins. It does not reset the system. The next tenant still gets physical copies, still lends one to a cleaner, still loses track of one at the next staff change — and the landlord still pays again at the next turnover. Turnover is the one moment when changing the logic costs the least: the unit is empty, the old lock is still on the door to be read, no trading hours are lost, and the incoming tenant has no habits to unlearn. Walter's two doors made the point neatly — one deadlock, one deadlatch, same flaw: access lived in objects that walk away. A code lives in one decision the owner controls, and turnover becomes changing that decision, not reissuing objects.

Three questions at the turnover door

Q1: What bolt is on your door edge?
A solid bolt that throws straight into the strike is a swinging deadbolt. A hook-shaped bolt that grabs the strike is a hookbolt, fitted on swinging doors that need to resist prying at the edge. The SK1850 comes in both, so match the bolt the door already has. If your cylinder or frame says Vistawall or Kawneer, it's the same Adams Rite MS-type footprint — SK1850 fits the same opening.

Q2: What is your backset?
Measure from the door edge to the center of the cylinder hole: 1-1/8" covers roughly eight in ten doors, with 31/32" and 1-1/2" covering the rest. The wrong backset will not mount, so photograph the door edge and the old lock before ordering and confirm the fit first — turnover week is busy enough without a return.

Q3: Does the door latch itself shut, with a push paddle inside?
Then it is a 4510-style deadlatch, not a deadlock, and turnover runs on the SK4510S(sfic) line instead: one shared code outside, paddle exit inside. If it is a deadlock and you want one physical backup only the owner holds, step up to the SK1850S(sfic): one shared code on a mechanical keypad with no batteries, no electronics, and it installs in minutes using the original holes when the footprint matches.

There's another option

Most landlords have never heard of a drill-free keyless retrofit: when the existing mortise footprint matches, an EASILOK keyless storefront lock drops into the original holes with no new drilling and installs in minutes, so turnover becomes changing a code instead of rekeying a lock. See the SK1850 line →

When this article doesn't apply

• The door or frame is damaged, sagging or freshly repaired? Judge fit on a sound door first — a door problem is not a lock problem, and no replacement reads correctly on a misaligned frame.
• The door is a sliding or automatic entrance? Different entrance family entirely — this article covers swinging aluminum storefront doors with mortise locks.
• The lock sits in the bottom rail of a full-glass door? That is the bottom-rail path, judged separately from the deadlock and deadlatch paths above.

FAQ

The outgoing tenant returned all their keys. Am I safe?
You hold the keys they returned. Copies made during the tenancy leave no record, so “all keys returned” really means “all keys they chose to return.” A code change is honest about that gap; a rekey is too — but the code stays changeable at the next turnover without another invoice.

What do I hand the new tenant on day one?
One shared code, taught once, plus a note of the date it was set. There is no key handover to photograph, no deposit copy to track, and no spare living under a counter for the cleaner.

Who holds the backup on an SK1850S(sfic) door?
The owner or manager — only ever a backup. Daily entry for the tenant's team stays on the code, and the SFIC key never becomes the thing being lent around the plaza.

When should the change happen?
In the empty window between tenancies: read the bolt, confirm the backset, photograph the door, and have the new code live before the incoming tenant's first stock delivery.

Searching "shop lock"? What you want is called a keyless storefront door lock.

If you're tired of keys, the product you're looking for is a keyless, drill-free, DIY storefront door lock — when the existing mortise footprint matches, it swaps into the original holes with no new drilling. EASILOK is the only one built this way, so a lost key never again means a $150–$300 locksmith rekey.

Bottom line: if a tenant has moved out and you cannot list who holds copies of the storefront key, then read the bolt, confirm the backset, and when the footprint matches, fit a keyless EASILOK replacement and start the next tenancy on one changed code.

More storefront-lock guides · EASILOK keyless storefront locks