Should You Change the Locks in a New Flat?
When you move into a new flat in Germany, you may wonder whether changing the locks is a sensible step. As an expat or international resident, you're right to think carefully about this: it touches on tenant rights, landlord relationships, insurance claims, and practical security. The answer depends on your lease terms, the flat's condition, and your peace of mind—but there are important German tenancy rules you should know before you act.
This guide walks you through the key considerations, what your Mietvertrag (lease) typically says, and when calling a certified locksmith makes sense.
What Does Your Lease Say?
Your Mietvertrag is the legal foundation. In many cases, German leases include a clause stating that you must return the flat in its original condition—and that includes the locks. Changing locks without permission can breach this obligation and may result in your Vermieter (landlord) deducting the cost to restore them from your security deposit (Kaution) when you leave.
Some leases explicitly forbid lock changes; others require written landlord approval. A few progressive contracts permit changes if you return the flat to its original state. Always read your lease carefully, or ask your landlord directly before making any decision. If you don't speak German fluently, ask a German-speaking friend to review the relevant section, or contact your local tenant advisory service (Mieterbund).
When Does It Make Sense to Change Locks?
There are genuine reasons to consider a lock change in a German rental flat:
- Shared keys with previous tenants: If you don't know how many copies of the old keys exist, or suspect someone still has access, a new lock gives you certainty.
- Broken or worn locks: If the existing lock is damaged or unreliable, you have a valid safety and security concern. Document this with photos and notify your landlord in writing (per Einschreiben if necessary).
- Lost keys: If keys go missing and cannot be recovered, a locksmith can often rekey the existing cylinder rather than replace the entire lock—a cheaper option worth exploring.
- Emergency access: If you're locked out, a certified locksmith can open the door without damage and discuss your options once inside.
In each case, communicate with your Vermieter first, explain the security reason, and ask for written approval. A reasonable landlord will support you if the issue is genuine.
Rekeying vs. Replacing: A Practical Middle Ground
Before you assume you need new locks, consider rekeying. A certified locksmith can change the internal pins of your existing lock cylinder so that old keys no longer work—without removing or replacing the entire mechanism. This is often faster, less noticeable, and less costly than a full lock change, and it may be more acceptable to your landlord because the original fixture remains in place.
Whether rekeying is a realistic option depends on the type and condition of your lock. A locksmith can assess this on site and advise you. If you do rekey or change a lock with landlord approval, make sure you get a receipt and keep spare keys safe in case the landlord needs proof of the original lock's restoration later.
Insurance and Liability: What You Need to Know
If someone breaks in because of a faulty lock you didn't report, your Hausrat (household contents insurance) may not cover theft—especially if the insurer can show negligence. Conversely, if you change a lock without permission and then cannot access the flat in an emergency, or if the landlord needs emergency access (for a gas leak, water damage, or fire), you could face liability issues.
In many cases, German insurers require you to report security problems promptly and to maintain locks in working order. Check your policy wording or ring your insurer if you're unsure. The safest approach is always to keep your landlord informed in writing (Email or registered letter / Einschreiben mit Rückschein) about any lock concerns and to get approval before making changes. This protects both you and your deposit.
When to Call a Certified Locksmith
If you're locked out, need emergency access, or want a professional assessment of your lock's security and the rekeying option, a certified local locksmith is the right person to call. They can evaluate the lock type, advise on what's legally and practically feasible in your rental situation, and handle the work professionally.
A locksmith can also provide a written report documenting the lock's condition, which is valuable if you later need to justify any changes to your landlord or insurer. They work to German standards (DIN) and can advise on whether your lock meets current security requirements for renters.
If you're facing an urgent lockout, a security concern you can't resolve with your landlord, or simply want expert guidance tailored to your lease and situation, our English-speaking hotline connects you with a certified locksmith in your area who understands expat tenancy concerns. They can advise on your options without pressure and help you make a decision that protects both your security and your rights.
Frequently asked
Can my landlord refuse to let me change the locks?
Yes, in most cases. Your Mietvertrag typically requires you to return the flat with its original locks, and your Vermieter can forbid changes. However, if the lock is broken or a genuine security risk, a reasonable landlord will usually approve a rekey or repair. Always ask in writing first.
What happens if I change the locks without permission?
Your landlord can demand you restore the original locks at your cost, and they may deduct this expense from your Kaution (security deposit) when you move out. It can also damage your relationship and make it harder to negotiate other issues. Not worth the risk unless you have explicit written approval.
Is rekeying cheaper and faster than replacing a lock?
Usually yes. Rekeying involves changing the pins inside the existing lock cylinder, so the old keys no longer work. It's quicker and often less visible to your landlord than a full lock replacement, and may be more acceptable since the original fixture stays in place.
What should I do if I lose my keys?
Contact your landlord or Hausmeister (building manager) immediately—they may have spares. If keys cannot be recovered, ask your landlord if you can rekey the lock (usually cheaper than replacement) or arrange a professional locksmith to help. Always get written approval before any work.
Will my Hausrat insurance cover a break-in if I didn't change faulty locks?
Probably not. Insurers often deny claims if you've neglected to report or repair security problems. If your lock is broken or unreliable, report it to your landlord in writing and keep the email or registered letter as proof. A working lock is your duty.
Can a locksmith help me figure out what's allowed?
Yes. A certified locksmith can assess your lock, advise on rekeying versus replacement, and explain what's typically required under German rental law. They can also provide a written condition report, which is useful if you need to justify any changes to your landlord or insurer.