German flatshare room agreement with rent share calculator

This German flatshare room agreement first works out what one room carries of the total rent, then writes the contract between the main tenant and the new flatmate (WG-Zimmer).

Independent site, not a law firm: a standard template, like a book of legal forms, not legal advice.

Share of the rent
Main tenant
New flatmate
Agreement
Place and date

Example: €1,350 all-in, 90 m², 3 people, room of 16 m² — change any figure to see your own result

Your share of the rent

€420

room plus 1/3 of the shared space

By room size€420
Per head€450
Shared space36 m²
Monthly incl. internet and kitty€445

Go to the finished document

A standard template, like a book of legal forms: no review of your individual case and no legal advice. What you type stays in your browser.

How the check works and its sources

In most German flatshares (Wohngemeinschaft, WG) only one person, or some of the residents, signed the lease with the landlord; new flatmates become subtenants of that main tenant. The argument almost always starts with who pays how much. The calculator above splits the all-in rent two ways: per head, so everyone pays the same, or by floor area, so everyone pays for their own room plus an equal part of kitchen, bathroom and hall. With €1,350 all-in rent, a 90 m² flat, 54 m² of rooms and three people, a 16 m² room carries €420 by area and €450 per head. The larger room of 22 m² would come to €510. The agreement records the chosen amount, the deposit, the internet share and the household kitty, in German. The landlord’s permission to sublet is still needed.

Empty fields print as a line to fill in by hand. The document is in German, as the other party expects.

Untermietvertrag für ein WG-Zimmer

Zwischen ____________________________, ____________________________, __________________ (Hauptmieter)

und ____________________________, bisher wohnhaft ____________________________, __________________ (Mitbewohner)

wird folgender Vertrag über ein Zimmer in einer Wohngemeinschaft geschlossen:

§ 1 Zimmer und Gemeinschaftsräume

Der Mitbewohner erhält ein Zimmer von rund 16 m² zur alleinigen Nutzung. Küche, Bad, Flur und weitere Gemeinschaftsräume (zusammen rund 36 m²) nutzen alle 3 Bewohner gemeinsam.

§ 2 Erlaubnis

Der Hauptmieter versichert, dass der Vermieter der Aufnahme eines Untermieters zugestimmt hat (§ 540 BGB). Endet der Hauptmietvertrag, muss auch der Mitbewohner das Zimmer herausgeben (§ 546 Abs. 2 BGB).

§ 3 Beginn und Kündigung

Der Vertrag beginnt am 14. November 2026 und läuft auf unbestimmte Zeit. Für die Kündigung gelten die gesetzlichen Fristen (§ 573c BGB); sie bedarf der schriftlichen Form.

§ 4 Mietanteil

Die Gesamtmiete der Wohnung von 1.350,00 € wird nach Fläche geteilt: Zimmer plus gleicher Anteil an den Gemeinschaftsräumen, das sind 31,1 Prozent der Wohnfläche. Der Anteil des Mitbewohners beträgt 420,00 € monatlich.

Er ist bis zum dritten Werktag jedes Monats an den Hauptmieter zu zahlen. Ergibt die Betriebskostenabrechnung des Vermieters eine Nachzahlung oder ein Guthaben, wird sie im selben Verhältnis geteilt.

§ 5 Internet, Haushaltskasse, Kaution

Für den gemeinsamen Internetanschluss zahlt der Mitbewohner 10,00 € und in die WG-Kasse für Putz- und Verbrauchsmittel 15,00 € im Monat. Er leistet eine Kaution von 800,00 €, die nach Auszug und Abrechnung zurückgezahlt wird.

§ 6 Zusammenleben

Die Bewohner reinigen die Gemeinschaftsräume nach einem gemeinsam vereinbarten Plan. Die Aufnahme weiterer Personen auf Dauer bedarf der Zustimmung aller Bewohner und des Vermieters.

__________________, den 14. November 2026

Hauptmieter

Mitbewohner

Checked by Radif Partners · Editorial policy · Method and sources

The German flatshare room agreement in five points

The template records the room and the shared use of kitchen, bathroom and hall, the move-in date, the monthly share of the all-in rent, contributions to internet and shared shopping, the deposit and payment to the main tenant. How the rent is split is written into the agreement so that the next change of flatmate does not reopen the debate.

Total rent €1,350 all-in, 90 m², 3 people, 36 m² shared space
Roomby areaper head
12 m²€360€450
16 m²€420€450
22 m²€510€450

Main tenant, co-tenant or subtenant

If every resident signed the lease with the landlord, they are co-tenants: they are jointly liable for the whole rent and can only give notice together. If only one signed, the others are his subtenants, and the flatshare agreement governs their relationship with him. For each change of flatmate the main tenant needs the landlord’s permission; section 553 BGB gives a right to it when the interest arose after the lease was signed. How much protection a subtenant has is shown on the sublease agreement page.

Frequently asked questions

Tap a question to see the answer.

How do you split rent fairly in a German flatshare?

The fairest split is by area: each person pays their room’s share of the flat plus an equal part of the shared rooms. In the example, with 36 m² of shared space, 12 m² is added to each room. A 16 m² room then pays €420 instead of €450 per head.

Does a flatshare room need its own written agreement?

German law does not require one, but without it nobody knows later which rent, deposit and notice period were agreed. A short agreement between the main tenant and the new flatmate settles that in five minutes. The landlord must still consent to the sublet under section 540 BGB, and the main lease stays unchanged.

What notice period applies to a flatshare room?

If the main tenant lives in the flat and mostly furnished the room, either side may give notice by the 15th to the end of that month. If the room is let empty, three months apply as for a flat, with receipt by the third working day. The sublease template works out both cases to the day.

Related templates

Sources

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Independent publisher of free German contract and termination templates you fill in in your browser, with a notice-period calculator based on the German Civil Code

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Rules as of 2026, read on