Conduits for SAT and TK, mandatory or not in new construction?

Why should that be mandatory? That is not safety-related but a luxury

Did I write anything about "safety-related"? I only gave examples. There are apparently also 5 sockets mandatory from 20sqm, are these "safety-related"? Rather not, right? You could also classify that as "luxury" and still they are mandatory (even if it is not mentioned in the construction service description ...) Do you notice something ;-) But there are also some here who really want to help and can, thanks for that.

There are apparently also 5 power outlets required from 20sqm,

No... for what? For what kind of rooms? That is not correct. There is no obligation to plan power outlets per x sqm. Even common rooms do not have this obligation.

The only thing that is prescribed and not directly safety-relevant, to my knowledge, are the window areas in [Aufenthaltsräumen].

No… for what? For what kind of rooms? That is not correct. There is no obligation to plan sockets per x sqm. Even living rooms do not have this obligation.

Is it then not mandatory?

Which standards for sockets in the house exist? Where to plan sockets in new buildings? According to DIN 18015-2 / RAL-RG 678 equipment level 1 (low equipment), for

[*]kitchens,
[*]living rooms,
[*]bedrooms,
[*]guest rooms and
[*]studies

each 5 sockets must be planned, provided the room is larger than 20 sqm. For smaller rooms like the bathroom, 4 sockets are sufficient, as well as for utility rooms, dining rooms, and hobby rooms.

Again: a standard is not an obligation.

Equipment level 1 (basic equipment)

… a guideline on the topic of equipment features low/standard/upscale/exclusive Your link belongs to an advertising placement site. See hea

to plan to place 5 sockets each, provided the room is larger than 20 sqm

This is then in 98% of all single-family house cases a room, living/dining, and there everyone "voluntarily" already has more sockets,