March 16, 2026
Estimating Warmmiete When a Listing Doesn't State Nebenkosten
Many German apartment listings mention only the Kaltmiete and leave Nebenkosten open, or simply add "plus Nebenkosten" with no figure attached. If you want to budget realistically, you can bridge that missing number with official average figures instead of guessing.
Why Nebenkosten are often left out
Nebenkosten depend on the previous year's actual billing, things like heating behavior, the building's condition, and the number of tenants sharing costs. Because of that, many landlords list only a provisional flat rate in the ad, or no figure at all, pointing instead to the first Nebenkostenabrechnung after move-in. That makes it harder for apartment hunters to estimate the real Warmmiete in advance.
Using the Tenants' Association's cost survey as a benchmark
The German Tenants' Association publishes a nationwide operating-cost survey (Betriebskostenspiegel) every year. For billing year 2024, the average came to €2.67 per square meter per month, rising to €3.68 in particularly cost-intensive buildings. Heating and hot water alone accounted for an average of €1.32 per square meter, up to €2.18 in extreme cases.
These figures translate directly to a real listing: a 65-square-meter apartment with no Nebenkosten stated would cost roughly an extra €174 a month on top of the Kaltmiete at the average rate. For an older, poorly insulated building, it's safer to plan around the higher figure of about €239.
Step by step to an estimated Warmmiete
Note the apartment's living space (usually stated in the listing).
Multiply that figure by the Tenants' Association average of €2.67 to get a cautious estimate.
For older buildings (built before 1990, no visible renovation), use the higher benchmark of up to €3.68 per square meter instead.
Add the result to the Kaltmiete to get your estimated Warmmiete.
Compare that number against your own budget, not the Kaltmiete alone. Our 30% rule budgeting guide explains how to weigh that figure against your income.
What clues to look for in the listing
Some listings carry indirect hints about the real cost picture: year built, energy rating, heating type (district heating, gas, heat pump), and whether a renovation is mentioned. An unrenovated older building with gas heating typically runs above average on Nebenkosten, while a newly insulated apartment with a modern heating system tends to run below it. If you're unsure, you can ask directly for the previous year's Nebenkostenabrechnung before viewing; most landlords will share it on request.
After moving in: prepayment versus the final bill
The Nebenkosten prepayment stated in the listing or lease is only the landlord's estimate at first. Once a year, the actual bill follows under Section 556 BGB. If the prepayment falls well short of the real costs, a back-payment can come due. Comparing your own estimate from the Tenants' Association figures against the agreed prepayment ahead of time helps you spot early whether it's realistic or a back-payment is likely.
Frequently Asked Questions
How high are average Nebenkosten in Germany?
According to the German Tenants' Association's operating-cost survey, they averaged €2.67 per square meter per month in 2024.
What do I do if a listing states no Nebenkosten?
Multiply the living space by the Tenants' Association average and add the result to the Kaltmiete to get a realistic estimated Warmmiete. Our rent affordability guide walks through the full budgeting steps.
Can the actual bill come out higher than the prepayment?
Yes. If the agreed prepayment is below the real costs, a back-payment becomes due at the annual settlement under Section 556 BGB.
Are heating costs included in Nebenkosten?
Yes, heating and hot water are the largest single item within Nebenkosten, averaging €1.32 per square meter according to the Tenants' Association survey. See our Kaltmiete versus Warmmiete breakdown for how these categories fit together.
