Utility bill too high in Germany? How to tell if your Nebenkosten are wrong

Short answer

A utility bill that is too high in Germany is often correct in its total but wrong in its details, and the only way to know is to check the items, the allocation key and the invoices. A large back payment usually has a simple reason: the monthly advance payments were lower than the actual costs, often because energy prices rose or because the advances were set low when you moved in. That is not an error. But statements also regularly contain costs that may not be passed on to tenants, a wrong floor area or heating that is split the wrong way. Those are errors, and you can object to them within 12 months.

A high utility bill rarely has only one cause. These are the reasons we see most often when tenants ask why their Nebenkosten went up:

• Advance payments too low

  Your monthly advance (Vorauszahlung) was set when you moved in and never adjusted. The costs grew, the advances did not. The difference comes back as a Nachzahlung.

• Higher energy prices

  Heating and hot water are the biggest block. When gas, oil or district heating get more expensive, or the CO₂ price rises, your share rises too, even if you heat the same way.

• Higher consumption

  A cold winter, working from home, a baby, a new partner moving in: more heating, more hot water, more water. Consumption-based items follow.

• New or higher cost items

  A new cleaning or caretaker contract, higher waste fees from the city, or property tax (Grundsteuer), which has been calculated under new rules since 2025.

• Your first full year

  If you moved in during the previous period, last year's statement only covered a few months. A full year now looks much higher.

• An error in the statement

  Costs that may not be passed on, items not agreed in your contract, a wrong key, wrong areas or missing advance payments.

Put this year's statement next to last year's. Then look at where the difference comes from. This table helps you read the signs:

A jump alone proves nothing. But it shows you exactly where to look, and which invoices to ask for.

The law only says that advance payments must be reasonable. It does not say they must cover all costs:

This rule protects you mainly against advances that are too high. If they were too low, you generally still owe the difference. According to the Federal Court of Justice, the landlord is only responsible under special circumstances, for example if they expressly assured you that the advances would cover the costs, or set them deliberately low to get you to sign (judgment of 11 February 2004, VIII ZR 195/03).

After every statement, both you and your landlord may adjust the advance payments to a reasonable amount, by a declaration in text form (§ 560 (4) BGB). After a big back payment, expect a higher advance. That is annoying, but it protects you from the next surprise. If you think the new advance is too high, ask how it was calculated.

German law obliges your landlord to follow the principle of economic efficiency (Grundsatz der Wirtschaftlichkeit) when billing operating costs (§ 556 (3) sentence 1 BGB, § 560 (5) BGB). In practice, this means: no service at any price, and no costs the building does not need.

• A caretaker or cleaning company that charges far more than comparable providers
• Services that are paid but not performed, for example garden care for a garden that does not exist
• An expensive insurance policy that covers risks the building does not have

The hurdle is high, though. If you claim your landlord acted uneconomically, you have to show it in concrete terms. The Federal Court of Justice decided that a nationwide average alone is not enough (judgment of 6 July 2011, VIII ZR 340/10). What helps: comparison offers, last year's invoices and the contracts behind an item, which you can see when you ask to inspect the invoices.

Heating and hot water are usually the largest part of a high utility bill, and the part with the most rules. Check these points in your heating statement (Heizkostenabrechnung):

• Is 50 to 70 % split by consumption (§ 7 HeizkostenV)? If heating is split only by floor area against the rules, you may reduce your share by 15 % (§ 12 HeizkostenV).
• Are any readings marked as estimated (geschätzt)? Estimates are allowed only in certain cases, for example when a device failed (§ 9a HeizkostenV).
• Do the readings match the devices in your flat? More heat cost allocators than radiators is a clear warning sign.
• Is the landlord's CO₂ share shown and credited? If the CO₂ information is missing, you may reduce your heating share by 3 % (§ 7 (4) CO2KostAufG).
• Do you get monthly consumption information? With remote-readable devices it is required; without it, a 3 % reduction is possible (§ 12 HeizkostenV).

• Management and bank fees

  Fees of the property management or account charges may not be passed on to residential tenants (§ 1 (2) No. 1 BetrKV), but they appear, sometimes inside other items.

• Repairs disguised as maintenance

  A new pump, a repaired door or a replaced gutter billed as caretaker, garden or maintenance costs. Repairs are the landlord's job (§ 1 (2) No. 2 BetrKV).

• Costs not agreed

  Items your rental contract does not mention. “Other operating costs” must be named one by one in the contract.

• Vacant flats

  Empty flats in the building must carry their share. If the total area is too small, the tenants pay for the vacancy.

• Double billing

  The same cost twice: water in the heating statement and again as its own item, or cleaning by the caretaker and by a cleaning company.

• Advance payments missing

  Fewer than 12 monthly advances deducted, or the old amount instead of the raised one.

1. 1

   Find out where the difference comes from

   Compare each item with last year. Note the items that grew most.

2. 2

   Check your advance payments

   Are all monthly advances deducted, in the correct amount? Low advances explain a big Nachzahlung without any error.

3. 3

   Compare items with your contract

   Each item must be a cost type of § 2 BetrKV and agreed in your rental contract.

4. 4

   Check keys and areas

   Your floor area, the total area, your number of persons and the period. One wrong value changes many items.

5. 5

   Look at the heating statement

   Consumption share, estimated readings, CO₂ credit. Heating is where the big amounts are.

6. 6

   Ask for the invoices

   For every item that jumped or looks strange, ask to inspect the invoices (§ 556 (4) BGB).

You have more options than “pay” or “don't pay”. Here is how to protect yourself without risking an argument:

• Ask for the invoices. As long as your landlord refuses a justified request, you do not have to pay the back payment (BGH, 7 February 2018, VIII ZR 189/17).
• Object in writing. Name the item and the reason. The deadline is 12 months after you received the statement (§ 556 (3) sentence 5 BGB).
• Pay the undisputed part, or pay under reservation. A payment without reservation is not an acknowledgement of the statement (BGH, 12 January 2011, VIII ZR 296/09). Writing “unter Vorbehalt” makes your doubts clear.
• Ask for instalments if you need them. There is no legal right to pay in instalments, but many landlords agree if you ask early.
• Adjust your advance payments. After the statement, you can set them to a reasonable level (§ 560 (4) BGB), so next year holds fewer surprises.