What Your Lease Says Controls Most of This
Whether you can change your own locks usually starts with your lease, not a general state right. Some leases are silent on it, some require written landlord permission before you touch the locks, and some just require that you give the landlord a copy of the new key within a set number of days. Read your specific clause before you act — a lease that requires permission and doesn't get it can turn an otherwise reasonable safety decision into a lease violation on paper, even if a court would side with you later on the underlying safety issue.
If your lease is genuinely silent — no mention of locks at all — that isn't the same as a green light. Most leases include a general "no alterations to the unit without permission" clause, and a lock is arguably a fixture, so it's worth asking anyway rather than assuming silence means you're free to swap the hardware without a word to your landlord.
Why Landlords Ask for a Key
This isn't only about control. A landlord generally needs access for genuine emergencies — a fire, a burst pipe, a gas leak — and if they can't get in because the locks changed and they don't have a key, that can delay a repair that protects the whole building, not just your unit. Fire and building codes in many areas also require landlords to maintain emergency access to every unit, which is part of why so many leases treat an unauthorized lock change as a serious issue even when the tenant's underlying reason was reasonable. Most lease clauses about lock changes are written around this access problem rather than as a blanket ban on tenant security decisions.
When You Can Usually Change Locks Anyway
Locks that are broken, don't work, or were never replaced after a previous tenant moved out are a security problem the landlord is normally responsible for fixing — ask in writing first, describe exactly what's wrong (say, "the deadbolt doesn't fully engage" rather than just "the lock is bad"), and keep a copy of the request. If the landlord doesn't respond within a reasonable time, you're generally on stronger footing to act rather than continue living with a lock that doesn't actually secure your door.
Separately, if your landlord has been entering without proper notice, document every entry in writing first — a lease that requires permission can still treat an unauthorized lock change as a violation even when the landlord broke the notice rule, so ask a local tenant rights organization before you change them without asking. And for a tenant fleeing domestic violence, dating violence, sexual assault, or stalking, some states give an explicit right to change locks with notice rather than consent — check your state's tenant rights office or a local domestic violence advocate for the specific process where you live. If you live in public housing, Section 8, or another federally assisted unit, federal law separately lets a domestic violence survivor request an emergency transfer to another available unit, or lets the housing provider remove an abusive household member from the lease without penalizing the survivor (34 U.S.C. § 12491) — ask your housing provider's office directly, since that process runs through them, not your own locksmith.
What Your Landlord Is Never Allowed to Do
Whatever your lease says about you changing locks, the landlord changing the locks to keep you out — because of unpaid rent, a dispute, or anything short of a court order — is illegal everywhere it's been tested. This is usually called a "self-help eviction," and it doesn't matter how justified the landlord feels or how much rent is actually owed. Washington's law, for example, makes it unlawful for a landlord to remove or exclude a tenant from the unit without a court order, and lets the tenant recover possession and damages if it happens (RCW 59.18.290). If your landlord locks you out, call the police, don't wait, and treat it as urgent — some places have a fast court process specifically for getting you back into a unit after an illegal lockout, separate from the slower process a landlord would otherwise have to use to remove you lawfully.
Before You Touch the Locks
Send a written request or notice — even a text or email — so there's a record of what you told the landlord and when, whether you're asking permission or just notifying them afterward. If you're asking permission, give the landlord a reasonable window to respond before acting; if you're notifying them after a safety-driven change, do it the same day. Keep the old lock's hardware in case you need to restore it at move-out, since some leases require the unit to be returned with its original locks. Give the landlord a copy of the new key promptly once the change is made — holding it back, even to make a point, is usually what turns a defensible security decision into a genuine lease violation.
If You're Not Sure What Your Lease Requires
Lock-change language is often buried in a general "alterations" or "locks and keys" clause you might not think to look for specifically. If you're not sure what your lease actually requires, upload it to Honestkey and it will pull out the lock-change clause along with everything else that affects your security deposit at move-out, so you know exactly what's expected before you call a locksmith.