Canton BS
In Basel-Stadt a flat can be terminated for the end of any month except 31 December (§ 214(1) cantonal Introductory Act to the Civil Code). The notice dates in your lease take precedence over customary dates; the notice period for flats is at least three months (Art. 266c CO).
| Area | Dates | Note |
|---|---|---|
| Entire canton | any month end | Any month end except 31 December. |
The termination dates in your lease always take precedence. For flats the notice period is at least three months (Art. 266c OR).
For a lease in Basel without its own termination dates, our calculator currently works with 31.03. · 30.06. · 30.09.. The next reachable date: send the request by 26.12.2026, and the lower rent applies from 01.04.2027.
Where termination is possible at more dates, we deliberately use a conservative subset so that no request is sent too late.
State conciliation office for tenancy disputes, Basel-Stadt
One office for the whole canton, Grenzacherstrasse 62, 4005 Basel. It also advises tenants and landlords by phone or in person (German only) and accepts conciliation requests in writing or electronically. Conciliation in tenancy matters is free of charge (Art. 113(2)(c) Swiss Civil Procedure Code).
Official information and addresses
Tenants have 30 days to file after a refusal or after the landlord's 30-day answer window has passed (Art. 270a para. 2 OR). See what to do if the landlord refuses.
For individual advice: Mieterinnen- und Mieterverband Basel
Applies to e.g. Basel, Riehen, Bettingen.
Compiled with care from the sources listed; customary dates can vary locally. No legal advice.