Sauna in the main bathroom or in the basement?

No picture at the moment unfortunately, I can take one after the unit is finally installed in December ;-) Wow, 30,000€ is quite a statement. That should be enough. If money is no object, I would go to the friendly Klafs partner and check out the S1 and get advice. Bring a floor plan, they will then make you an individual offer. They come in different sizes and materials. Depending on the version, you will end up somewhere between 18 and 25k price-wise. Klafs is pricey, but the solution with folding in and out is just cool.

Thanks for the info. Klafs is one of the manufacturers we have on our radar anyway.
The 30,000€ was simply the maximum budget I had planned for it. But it definitely doesn't mean that we have to exhaust the budget. It's also nice if we get a high-quality alternative for less.

The fundamental question is: If the sauna goes on a certain floor, what would the sauna be swapping places with? For me, the question was: studio or sauna, one goes in the basement and the other goes in the attic. For me, the choice was clear.
If the choice is: storage room or sauna, for me it would also be clear, I would put the storage room in the basement.

So if the sauna replaces nothing on the upper floor, then it’s perfect.

Due to the large floor area, the sauna actually fits on any floor.
We have now first communicated the upper floor to the architect as the preferred location. From there, we could also realize a relaxation room with a view of the fields and access to the balcony.
Our basement will also not be a typical basement, but except for the technical/utility room and storage room, proper living space. So with underfloor heating, parquet flooring, large windows, ventilation, etc. Among other things, a fitness area, a sewing room, and another office are to be realized there.

While reading the thread, I kept thinking: big house, big basement. Why not have the basement on one side with patio doors and access to a lower ground floor terrace with a barrel, whirlpool, and small stairs to the garden. And then something like this comes up:

So with underfloor heating, parquet flooring, large windows, ventilation, etc. It should include, among other things, a fitness area,

I see the sauna in the basement, next to it fitness and co. Roof terraces may have their charm, also good for a sundowner, but I only see a sauna in the upper floor in exceptional cases, if there is a direct exit to the garden. I combine sauna with a winding and illuminated path in the dark, maybe then nighttime bathing in the (whirlpool) pool and many tactile and relaxing surfaces – but not with an above-ground roof terrace. If the house is still being planned and money is no object, you can play with open spaces and stairs/galleries indoors, so that everyone gets their money’s worth and basement/lower ground floor, ground floor, and upper floor are connected even outside a staircase – insofar I wouldn’t even think in terms of floors or rooms, but see such wellness areas as connections between spaces. And possibly the sewing room would be better placed upstairs than the bedroom in the basement/lower ground floor?!

On the Klafs website, there are pictures. For example:

While reading the thread, I kept thinking: big house, big basement. Why not have the basement on one side with terrace doors and access to a basement terrace with barrel, whirlpool, and little steps leading to the garden. And then something like this comes along:

I see the sauna in the basement, next door fitness and co. Roof terraces may have their charm, also good for a sundowner, but I only see a sauna in exceptional cases on the upper floor if there is an exit to the garden. I combine the sauna with a winding and illuminated path in the dark, possibly then night bathing in the (whirlpool) pool and many tactile and relaxing surfaces – but not with an above-ground terrace. If the house is still being planned and money is no object, you can play with air space and stairs/gallery inside so that everyone gets what they want and basement/lower ground floor, ground floor and upper floor are also connected outside of a staircase – in this respect I wouldn’t even think in floors or rooms, but see such wellness rooms as a connection of areas. And maybe the sewing room on the upper floor would be better off than the bedroom in the basement/lower ground floor?!

Thank you for your thoughts. Much of it sounds very interesting. We currently have the bedroom in the basement in our existing house and consciously do not want to do that anymore. On the other hand, we can well imagine combining fitness and wellness in the basement. We have discussed with the architect that we would like different design proposals in this regard.

Exactly, let yourself be given suggestions and then decide how it feels better for you.

We also initially wanted to combine fitness in the basement with a sauna. We have large terrace doors leading to a small light well, from there a staircase would lead up to the garden. So that would have been a good option, it was even our first preference and instruction to the architect. He then showed us a design of a sauna in the bathroom and in the end we decided on that because I am not really in the fitness room as regularly as I should be ;))) and because we liked the privacy of the parents' area. That is really our space and there we have our peace and our retreat with a sauna. But I think there is no right or wrong, you have to do it in a way that feels right for you.

Small fun fact: We also have a sewing room in the basement...