Bathtub - GU does not want to set it lower

The GU can deliver something professional without tricks: fittings on the narrow side, on the partition wall to the WC. That used to work (TM) as well. There was the bathroom heater there. That it is neither contemporary nor nice is another matter.

Although the TE would first have to clarify whether the 10 cm by which the tub can be set deeper then provide enough space for mounting the fitting. If it is a wooden house, there is a beam under the window, so you cannot simply install the fitting directly under the windowsill.

That may be so. The client is the layman; if he demands nonsense, he must be pointed out to it. However, there are obviously plans that depict this as feasible. It does not matter whether the architect or the contractor drew this. At the time of contract conclusion, both parties agreed to execute the service. It is also technically feasible. But you cannot hold the client responsible for additional costs. He expressed his wish (bathtub under the window) and the contractor quoted his contract price accordingly. Heating under the shower, yes, no question. But what does it bring under the Styrofoam support of the bathtub?

Does underfloor heating beneath the bathtub really make a difference?

Does underfloor heating beneath the tub really make a difference?

Yes.

So basically, this only caught my attention because I am recreating the house in 3D. Apparently, no one had noticed it so far. The bathtub has always been in front of the window, and the parapet height was only changed in that I (the builder) wanted it as high as possible. The floor plan of the house was adjusted by the salesperson/architect and then taken as the contractual basis. Half a year later, execution drawings of the trades were created from this, which apparently had already been tendered, since the "issue" was additionally sent by email to the plumbing company. Basically, I only uncovered a planning deficit which would certainly have been more complicated to solve in a later construction phase due to missing planning and time pressure. I think I am allowed to assume that these costs are included in the fixed price. After all, I have already transferred the 2nd installment and the shell construction will continue soon. If they are missing heating capacity, I would install an electric towel radiator...

Yes, it certainly sounds like the detailed planning is being left to the craftsman on the construction site. With our general contractor, we were instructed to specify all sanitary fixtures including fittings with name + type BEFORE the sample selection. During the sample selection, the detailed positions including washbasin/WC heights etc. were determined. As an attachment to the sample selection, there were technical dimension drawings of the objects so that there were no ambiguities. Afterwards, the result went to the master plumber, who validated the planning and supplemented the pipe routing. It would have been noticed there. Additional expenses, e.g. an extra stud wall, different pipe routing, would have been at our expense. I needed a changed pipe routing in the cold water line (due to a chimney boiler with TAS). I discussed this with the plumber, received the surcharge by email, confirmed it, done.

A small episode on the side: Of course something went wrong! We have a built-in fitting from Grohe in the guest WC. They have a separate installation body for pretty much every fitting. The general contractor looked up the appropriate article number from his database and installed it. At the end of the tiling work, we wanted to mount the mixer lever and spout ourselves. DOES NOT FIT!! The set was correct, but the cartridge in the installation body had too large a diameter. Three days of research: Grohe changed the design of the series one year before installation (about 3 months before sample selection) and significantly slimmed it down. This required a new built-in body, but the database at the general contractor still knew the old article number. The parts matching the old built-in body were no longer available even from Grohe. So the general contractor replaced the built-in body from behind... the bathroom was completely tiled. Fortunately I have a wooden house. But the installer really sweated.