Berlin Landlord made an error in the contract, and now wants all tenants to correct the error by paying sum's going back 18months. Can they?

A little more detail:

  • A friend moved into a new apartment in Berlin 18months ago.
  • Last week, they received a demand, to be paid within 15days, with back dated charges for all 18months.
  • The contract he (and other tenants have) references the size of the apartment in sq meters, it references the total monthly rent to be paid, but does not reference a formula on how the total monthly rent was calculated.
  • The reason for the demand is the landlord discovered they calculated using the wrong sqm cost.
  • I believe the landlord might be able to increase rent going forward, but not back date 18months. True/false?


  • 2
    Is the contract stated as charging a fixed amount per sqm? Or is the contract for a particular amount per unit, and the size of the unit is a representation about what the tenant is renting?
    – user6726
    Sep 27, 2017 at 15:30
  • The contract does not state any relationship between sqm and cost per sqm, nor does it imply any relationship between the size of the apartment and the cost. The start of the contract describes the apartment, and references the size. Later in the contract it says the tenant agree's to pay x euros monthly. X is defined as y euros is for rent, and z is a contribution towards communal costs (hallway, house master, elevator). (The size is therefore a representation of what the tenant is renting).
    – fiprojects
    Sep 27, 2017 at 18:33

1 Answer 1


When a contract states a thing that you get for a stated price, that means you should get the thing described, and you pay the stated price. If the landlord makes a mistake and wishes he had charged more, he can wait until the end of the lease period and then increase the price as he desires. He cannot raise the price until the end of the contract, and cannot retroactively charge that increase. (It's impossible to imagine there being contract language that allows that outcome, but we will assume there is no such clause).

If the stated area is not as stated, especially if the area is actually smaller, the landlord is in breach of the contract, and could be sued for damages. It would depends on how different the areas are, when it comes to assigning damages. For example, 4 sqm in a unit with 800 sqm is not likely to result in any loss to the tenant. If the unit is bigger than stated, the prospects for damages are even less, perhaps a bit for added heating cost. Either way, if the size is incorrectly described, that is the landlord's fault, though probably not worth bothering with a lawsuit.

  • 2
    "increase as he desires" - as far as German law allows it.
    – gnasher729
    Jan 6, 2022 at 14:11

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