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Garden sauna in the canton of Graubünden: do you need a building permit?
Which rules apply to an outdoor sauna in the canton of Graubünden, which sizes are possible without a permit and how to proceed.
Updated: September 2026 · independent guide, sources linked
In short
Usually yes. The exemption only covers very small outbuildings such as tool or garden sheds – a sauna practically never meets these conditions.
The rule in the canton of Graubünden
Buildings with a volume up to 5 m³ and bike shelters up to 4 m² (Art. 40 para. 1 no. 5 KRVO). These too must be notified to the municipality in writing; without a reply within 15 working days you may build (Art. 40a KRVO).
What this means for your sauna
The exemption is meant for tool and garden sheds, not heated rooms where people spend time. On top of that, almost every sauna exceeds the size limit. Expect to file an application – ask your municipality which procedure applies.
5 m³ is roughly a cube 1.7 m on each side – every sauna is larger. In mountain areas, snow loads and townscape rules also apply.
Procedure and responsible authority
The responsible authority is usually your municipality. Many cantons have a simplified procedure (notification) for minor projects; otherwise the ordinary procedure with public notice applies.
Step by step
Note the dimensions
External dimensions including roof and chimney, heater type, planned location and distance to the boundary.
Check the zone
On the cantonal geoportal or at the municipality: is the plot in a core or protected zone?
Ask the building office
A short enquiry with a sketch and product sheet tells you whether and which procedure applies.
Paperwork
Good suppliers provide plans and data sheets you can use directly for the application.
Important: this page summarises the rules in plain language and does not replace information from the responsible authority. The legal texts in force and your municipality's decision are binding; municipalities may have stricter rules. Updated: September 2026.
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