ᐅ Bathroom Renovation in a House Built in 1979

Hello everyone,
I’m an enthusiastic reader of this forum and have already gathered some helpful tips.
We bought a house built in 1979 and are in the process of modernizing it. The bathrooms are next on the list. I’ve attached a plan. Since the bathroom upstairs is quite small and the adjacent room is not in use, the idea is to combine both rooms. At the same time, we want to keep the changes to the plumbing as minimal as possible. The wooden ceilings on the sloped areas will be completely removed, and we want to include a walk-in shower, a bathtub, two sinks, and a toilet. Additionally, we would like to fit a washing machine into the bathroom!
We have already come up with some ideas and created an initial sketch. However, there are always very knowledgeable users here on the forum, so I wanted to reach out to get some ideas and suggestions.
Looking forward to your replies!!!
Best regards,
Jan

Hello

Bathtubs, showers, and toilets are usually only partially movable. The soil pipes going downward are fixed where they are and cannot be relocated.
If the distances, for example between the bathtub or especially the toilet and the soil pipe, become too large, it becomes difficult to maintain the necessary slope for the wastewater pipes.
A level-access (walk-in) shower is also not always feasible.

Since the level-access shower is planned to be moved into another room, I suspect it probably won’t work.
With a standard shower tray or bathtub, it might (maybe) be possible.

The wall that needs to be removed is probably removable. However, always keep structural stability in mind and consult a structural engineer if there is the slightest doubt. That doesn’t cost much and is worth it.

All in all, the shower is likely not going to be feasible where you would like it to be.
A professional will need to take some measurements and calculate whether there is enough slope over the distance for the wastewater pipe.

Would there be other wastewater pipes nearby at the new shower location? For example, from the kitchen?
My bathtub is also connected to the kitchen drainage at its new location. I was lucky that it was possible to realize it that way.

Thank you very much for your reply!
The idea is to install a second wall under the sloped ceiling, through which the 5cm (2 inch) drain pipe from the shower will run. However, this definitely still needs to be discussed with a professional! There is another wastewater pipe in the wall that is partially going to be demolished. The wall should only have an opening made in it! That’s the plan 😉

As far as I know, the second wall doesn’t add much because the initial depth (shower drain) might already be too low.

The positioning of the drain pipes is always quite a challenge. The pipes for the shower and bathtub must run through the floor without fail. This often raises questions about the floor construction. With a wooden ceiling, you might be lucky or unlucky, depending on whether the joists run in the right direction.

It is a solid floor!