How much is my Berlin rent overpriced? - Free 2-min check | Conny
Your landlord knows the law. Now you do too.

Most Berlin tenants are overpaying €3,600 a year. Are you one of them?

See your number in 2 minutes - then decide if you want us to enforce it. Free check. No fee unless we win.

Berlin Altbau building with TV tower
Your rent
0/ month
Legal rent
0/ month
Potential savings
0/ month
See how much you can save
  • No landlord contact after check
  • You decide later
  • Backed by legal experts

What happens after the estimate?

After your free rent estimate, we email you the result and explain your options. If your rent can be reduced, you can decide whether to mandate Conny. We only contact your landlord after your approval.

What happens after the estimate?

After your free rent estimate, we email you the result and explain your options. If your rent can be reduced, you can decide whether to mandate Conny. We only contact your landlord after your approval.

You’re in good company.

Thousands of tenants in Berlin have already used Conny to lower their rent and free up money for what’s important to them.

Free estimate in 2 minutes
No upfront cost
No win, no fee
Built for tenants, backed by legal experts
Your data is secure and confidential
As seen in
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Rent Control exists to protect you.

Landlords count on the fact that the rules are complex - and that most tenants will never check. That’s how overcharging stays the norm, quietly, month after month.

Your legal rent depends on many factors

Apartment size, location, building age, condition, and contract details all matter.

Landlords usually know the rules better

They have more information and experience with Rent Control than tenants.

Research can be confusing and outdated

Online information is often hard to understand or doesn’t apply to your specific case.

A “normal” rent may still be too high

Your rent might appear fair - but could still exceed the legal limit under Rent Control.
How it works

Checking your rent is simpler than you think.

Answer a few questions about your apartment, get a free estimate in minutes, and see whether it may be worth taking the next step.

1

Enter your address and rent details

Tell us about your apartment, contract, and current rent.

2

Get a free estimate in 2 minutes

We calculate whether your rent may be higher than the legal limit.

3

Decide what to do next

If there is a realistic chance of saving money, Conny guides you through the next steps.

4

We send the legal letter to your landlord

Conny's legal team handles all communication. You don't have to talk to your landlord.

5

Your rent goes down - and overpayments may be recovered

Duration of the process varies, some resolve within weeks, for others, we have to take the landlord to court.

Free to check No upfront cost Secure & confidential

What you need for the free check

  • Your address
  • Monthly rent
  • Apartment size

No documents are needed for the first estimate.

Ready to check your rent?

See how much you can save Free check · No fee unless we win · 2 min
Why Conny

Experience matters when your landlord pushes back.

Landlords don’t always give in quickly. Some delay, negotiate, or try to wait tenants out. That’s why it matters who stands behind your case.

Conny has been enforcing tenant rights for 10 years. We know the rules, the landlord tactics, and the legal pressure points - and we’ve built a process landlords take seriously. While some lawyers may specialize in rental law, we specialize in Rent Control law — a highly specific subdomain of rental law.

10+ years of Rent Control experience

We have helped tenants challenge excessive rents for a decade.

Battle-tested in court

Conny has fought Rent Control cases all the way to Germany’s highest civil court.

Landlords know Conny

Many landlords know we have the experience and staying power to see cases through. They know "we mean business".

We know the landlord playbook

Delays, excuses, document requests, settlement tactics, dodgy clauses in contracts - we’ve seen them before.

Designed around tenants

Digital first, no unnecessary office visits, and consultations that fit your schedule.

A cheaper offer is not always the better deal.

If stronger experience helps reduce your rent by even €60 more per month, that can add up to €7,200 over ten years.

€60 more per month
= €7,200
10 years
No upfront cost

No upfront cost.

The rent check is free. If we successfully reduce your rent, Conny is paid by your landlord. If we do not succeed, you do not pay us.

How the pricing works in detail +

Fighting high rent should not depend on whether you can afford a lawyer. Conny exists so everyone can challenge excessive rent - not only tenants with the money, time, or confidence to fight alone.

If Conny can help and your rent is successfully reduced, our fee comes from your landlord. You allow us to enforce claims that may or may not exist on repayments before the actual rent reduction as our commission.

Our principle

Everyone (!) should be able to fight high rents.

1

Free rent check

Get your first estimate online in around 2 minutes.

  • No card
  • No payment
  • No obligation
2

We fight for a lower rent

If there is a realistic chance of success, Conny takes over and handles everything.

  • We review your case
  • We handle the process
  • We deal with the landlord
3

We’re paid from rent you’d lose anyway

While we fight your case, you keep paying your current (too-high) rent - money you’d lose anyway. Once the landlord agrees to lower it, we try to enforce the savings from before the rent reduction as our comission. Nothing leaves your pocket on top. In the rare event of a fast rent reduction within a few weeks, we charge a minimum fee of 6 monthly savings.

  • No extra bill on top of your rent
  • No upfront cost, ever
  • We only earn if your rent goes down
4

Then you keep saving

Once your landlord lowers the rent, the monthly savings stay with you.

  • Lower monthly rent
  • Long-term savings
  • You stay in control

Our principle: Everyone can fight high rents.

That’s why our model is built around accessibility, not expensive upfront legal fees. You deserve the chance to challenge excessive rent - no matter your income.

Want the full details?

Read exactly how Conny’s pricing works before you decide to continue.

See how our pricing works

Check your rent without paying upfront.

Start with a free estimate and see whether your rent may be too high.

See how much you can save
2 minutes No upfront payment Paid from rent you’d lose anyway
The real value is ahead

The big number isn’t what you’ve already overpaid - it’s what you save going forward.

A lower rent isn’t a one-time win. It’s every month, for as long as you stay. If Conny helps you save €300 a month, here’s what that means over the years you keep living there.

5years
=€18,000
€300 × 60 months
15years
=€54,000
€300 × 180 months

Conny is paid from water that would’ve gone down the drain.

Every month your rent stays too high, that money is gone - you’ll never get it back. Our fee comes from anything that has been overpaid before the rent reduction and may (or may not) be recovered. Without Conny, that money disappears for good. With Conny, it pays for the years of lower rent that follow.

Testimonials

Real tenants. Real results.

Thousands of tenants have already used Conny to lower their rent. Watch their stories and see what's possible.

Worried about your landlord?

You can check your rent without your landlord being contacted. If you later mandate Conny, we communicate professionally on your behalf. Your landlord cannot terminate your tenancy simply because you enforce your rights.

FAQs

Common questions - clearly answered

What is Rent Control?

Rent Control is a law to dampen the increase in rents on tight housing markets (§ 556d BGB). It was introduced nationwide in 2015 and is now effective in most federal states. Rent Control applies in many large cities such as Berlin, Hamburg, Munich, Cologne and many others, and allows tenants to reduce their rent if it is more than ten percent above the local comparable rent. This makes it currently the most powerful weapon against excessive rents, which is why every tenant should know about it and use it.

Where does Rent Control apply?

Rent Control generally applies throughout Germany. However, each federal state must define in which cities and communities it applies and implement the law independently.

To whom does Rent Control apply?

Rent Control applies throughout Germany and determines the maximum rent a landlord may charge for any given apartment within the scope of the law (see above). This maximum rent depends on the location and equipment of the apartment, as well as the age of the tenancy. You can determine your maximum rent without obligation and free of charge using our rent calculator.

How does Rent Control work?

In principle, it’s quite simple: When renting a flat, the landlord may not charge an excessive rent. A maximum of 10% above the local comparable rent is allowed. If you have to pay more, you can demand a reduction in rent during the current tenancy and reclaim the overpaid rent from that point on. But the devil is in the details: The tenant must activate Rent Control by means of a so-called qualified complaint letter; otherwise the landlord can simply keep the excess rent received. However, if you hire Conny, you do not have to worry about this: We will take over the complaint letter for you.

Is Conny also going to represent me in court?

Yes, if an out-of-court settlement cannot be reached and we consider judicial enforcement to be promising, our partner lawyers will also take legal action in court. The litigation costs are covered by Conny. The commission for Conny is only due in case of success. Should we not be successful, that's on us. We pay the bill (our lawyers, the counter party lawyers and the court fees) and move on. You don't owe us anything. For you: nothing changes. Your rent remains the same it is today.

Will the relationship with my landlord change?

Landlords are also aware of Rent Control and know that a higher rent is not legal. Accordingly, most of them remain calm and are willing to find an amicable solution for both sides. Many landlords already know Conny from the thousands of cases we have handled before. They usually understand that they are in violation of the law which is why we have found a professional working relationship with many of them. We are always friendly and professional but firmly stand up for your rights and never give in. A large proportion of landlords are housing companies that routinely process such cases.

Is the evaluation really free?

Yes, entry and evaluation of the data by Conny, including the calculation of the possible savings potential, is free of charge for you. You can then decide whether you wish to mandate Conny to enforce your right to a lower rent.

What are the costs for Conny’s service?

The Conny promise applies: Your landlord pays the bill. If we achieve a rent reduction for you, you benefit from an average of €300 more each month. Any claims from before the rent reduction are paid out to us by your landlord, including the excess security deposit you paid due to your previous high rent. We use these repayments to fund our team of legal experts. As a rule, we cover our entire commission from the repayment claims against your landlord and do not invoice you. In rare exceptional cases, and only if we achieve a result quickly and easily, we charge a minimum commission equal to the savings for the six months after we send the complaint. Under no circumstances will you pay more rent than you do today.

How does case processing work at Conny? Who can I contact?

As a legal tech company, case processing at Conny differs significantly from that of a traditional lawyer. You don’t have to show up with a bunch of paper documents at our office. Usually, we communicate via email but if you want to talk to one of our legal experts, you can always schedule a call at a time that is convenient for you. Talk to us now, new or existing customer.

Why Conny?

We are experienced IT and legal experts who have successfully enforced the German Rent Control for thousands of tenants. The principle is: You have no cost risk. We fight for your rights and only get paid (by your landlord) if we win. Our interests are aligned.

Convenient: We take care of the entire process with your landlord; we make applications, set deadlines, send reminders, request and pay our partner lawfirm if a court proceeding becomes necessary. All you have to do is mandate us and you will receive updates on your case.

No cost risk & active help: Unlike conventional lawyers, we only receive a commission if we are successful for you. If we are not successful, you have no costs. And unlike other consumer associations, we actively enforce your claims.

High success rate: Due to our processes, which have been successfully implemented thousands of times, and our automated processes, the experience of all cases flows into your case and we can proceed very effectively. We know every landlord trick, every dodgy clause and have heard all arguments hundreds if not thousands of times before.

Find out in 2 minutes what your rent should be.

Free check. No upfront cost. No win, no fee. Your tenancy is fully protected.

See how much you can save
2 minutes No win, no fee Tenancy protected