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Building permit for a garden sauna – all 26 Swiss cantons
In Switzerland, the cantons decide which small buildings can be put up without a permit. The differences are big – and for a sauna, whether a building is heated is often decisive.
Updated: September 2026 · independent guide, sources linked
Key points
- Principle: buildings and structures need a permit (Art. 22 Spatial Planning Act). Cantons only exempt minor projects.
- Heated or not: in Bern, St. Gallen, Solothurn and Neuchâtel only unheated small buildings are exempt – so not a sauna.
- Sheds only: in other cantons the exemption only covers tool or garden sheds, buildings without emissions or without combustion.
- Zurich is the exception: there, size counts (6 m², 2.5 m) – a very small barrel sauna may qualify, except e.g. in core zones.
- Permit-free ≠ rule-free: distances, fire safety and zoning rules always apply.
Renting or owning a flat? If you rent, you need your landlord's written consent before putting a sauna in the garden. In a condominium (Stockwerkeigentum), the owners' association usually has to agree as well – even if you have exclusive use of the garden.
Overview of all cantons
| Canton | Permit-free only up to | For a sauna |
|---|---|---|
| Aargau | 5 m² · 2.5 m | permit usually required |
| Appenzell Ausserrhoden | – | permit usually required |
| Appenzell Innerrhoden | – | permit usually required |
| Basel-Landschaft | 12 m² · 2.5 m | permit usually required |
| Basel-Stadt | 10 m² | permit usually required |
| Bern | 10 m² · 2.5 m | permit usually required |
| Fribourg | – | permit usually required |
| Geneva | – | permit usually required |
| Glarus | – | permit usually required |
| Graubünden | 5 m³ volume | permit usually required |
| Jura | – | permit usually required |
| Lucerne | 4 m² | permit usually required |
| Neuchâtel | 8 m² · 2.5 m | permit usually required |
| Nidwalden | – | permit usually required |
| Obwalden | – | permit usually required |
| Schaffhausen | – | permit usually required |
| Schwyz | – | permit usually required |
| Solothurn | 10 m² · 2.5 m | permit usually required |
| St. Gallen | 10 m² · 2.5 m | permit usually required |
| Thurgau | 9 m² · 2.2 m | permit usually required |
| Ticino | – | permit usually required |
| Uri | – | permit usually required |
| Valais | 10 m² · 3 m | permit usually required |
| Vaud | 8 m² | permit usually required |
| Zug | 4 m² | permit usually required |
| Zurich | 6 m² · 2.5 m | small models may be exempt |
Simplified overview. The legal texts and your municipality's answer are what count. Details and sources on the canton pages.
How to proceed
Note the dimensions
External dimensions incl. roof and chimney, heater type and location with distance to the boundary.
Ask the building office
With a sketch and product sheet – so you know which procedure applies.
File the application
Suppliers often provide plans and data sheets you can use.
History & background
Where does this sauna come from, and how did it develop? Find out in our section Sauna types & cultures:
Compare quotes from your region
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