Cold vs. Warm Operating Costs: What the Difference Means for Your Nebenkosten

Almost every Nebenkostenabrechnung (utility cost statement) distinguishes between "cold" and "warm" Betriebskosten, even though German law doesn't literally use those exact terms. They're still the key to reading your own statement correctly.

What counts as warm operating costs

Warme Betriebskosten cover only heating and hot water supply — fuel, maintenance of the heating system, and running the hot water system. According to the current Betriebskostenspiegel from the Deutscher Mieterbund, warm operating costs average €1.32 per square meter monthly nationwide, with peaks up to €2.18 in older, poorly insulated buildings.

What counts as cold operating costs

Everything else that can legally be passed on falls under kalte Betriebskosten: property tax, water supply and drainage, waste collection, building cleaning, garden maintenance, caretaker services, elevator, building insurance, and similar recurring items. They arise regardless of the weather or heating season and tend to stay more constant across the year than heating costs. With the nationwide average for all operating costs combined at €2.67 per square meter, the cold share works out to roughly €1.35 per square meter.

Why the distinction matters in practice

The two categories are billed under different rules. For warm operating costs, the Heizkostenverordnung requires consumption-based billing of at least 50% and at most 70%, because consumption can be metered. Cold operating costs, by contrast, are almost always split entirely by living space, since individual consumption is barely measurable for most of these items. If a statement doesn't make this distinction cleanly — for example, if heating is billed flat by floor area like a cold cost despite meters being installed — that's a sign something may be wrong.

How to check your own statement with this in mind

Sort every line item on your Nebenkostenabrechnung into one of the two categories. For warm costs, a consumption-based share should be clearly visible, usually shown via heat cost allocators or heat meters. If that share is missing entirely even though metering devices are installed, it's worth asking your property management about it.

If you're not sure which distribution key applies to a given line item in the first place, our guide on square meter vs. person-based billing walks through the legal default. And if you want to see typical costs broken down by individual item — electricity, heating, water, waste — check our monthly utility cost breakdown. For how Berlin's own average compares to the national figures used here, see Berlin's official Betriebskosten overview.

Frequently Asked Questions

What counts as warm operating costs?

Only heating and hot water: fuel, heating system maintenance, and hot water supply.

What counts as cold operating costs?

Everything else that's legally chargeable — property tax, water, waste collection, cleaning, garden care, caretaker, elevator, and building insurance.

Why is the cold/warm split important?

Because they're billed under different rules: warm costs must be at least 50% and at most 70% consumption-based under the Heizkostenverordnung, while cold costs are almost always split purely by floor space.