New build - which SmartHome system?

do you have examples?

: Thanks for the detailed explanation. I think we'll go through it again tomorrow. The BA button was overall more the result of "conventional" thinking or "not letting go."
How do I turn off the light when I / the children are in bed? How do you control that via the presence detector?

I don’t have children yet, but in our bedroom it works like this:
Each of us has a button in the bathroom/at the bedside table where he sets his status "Sleeping/Awake." If one of us is set to sleeping, the presence detector in the bedroom is locked and the light is turned off. In other words, the presence detector is disabled.
Under the bed is another presence detector, which is unlocked, i.e. activated, in return.
If it now detects movement, it only turns on a slightly dimmed LED strip under the bed. A kind of night light, so to speak. Because of its position under the bed, it really only reacts if you put your foot on the floor. The good one doesn’t notice any movement of any kind in the bed.

That’s roughly how I have planned it for the children’s rooms as well. At the same time, you can set with the sleeping button that the blinds should not react to the central open command in the morning, so that the roller/pleated blind really stays down.

As I said, there are only few limits. One of them is money. The other is the lack of sensors in the most important places.
If I were you, I would focus on that.
Whether the 46 buttons come in the end (so in a year or so) doesn’t matter at the moment, as long as the boxes are planned.

Heating and shading 11k? A few channels of heating actuators, shutter actuators, weather station, and glass pushbuttons are actually not that expensive

I take back my statement and claim the opposite

that this has little to do with smart home and was only thought of conventionally in KNX. Conversely, you planned only 2 motion detectors in the entire house.

THAT is what I thought too. The offer reads more like the electrician and builder basically have no real idea about KNX and the possibilities, but the builder wants to have KNX anyway. The electrician then just takes KNX parts and does the rest as usual. This is, as others have already written, very unfortunate because it is simply much more expensive and hardly brings any increase in comfort. You just have KNX in the house then. If done sensibly, the number of control points is massively reduced and the number of sensors increases significantly. Nobody has to adjust the temperature in every room with underfloor heating. At most, you do that as a booster in the bathroom; everyone else can go to the wall display twice a year.

A brief note:

If you plan boxes for PM in the concrete ceiling, i.e. those with mineral fiber covers, then the electrician should not just leave the cable with an open end inside. Either he simply makes a loop of the cable inside, or he clamps both ends immediately with the KNX terminals. The green cable has 4 cores, 2 pairs. Red+Black and Yellow+White. He should do the same with Yellow+White. This way, everything is connected through right away and there are no nasty surprises later that there is no voltage at another box. If the PM is not installed right away, you won’t be able to reach that spot later without cutting open the mineral fiber cover. Best is if he simply makes a loop in the box and moves on to the next spot; that is the safest.

The ceiling of the basement will be installed tomorrow, starting next Monday the cables will be laid in the ceiling, I don’t think we have much time left...

You can also save something on the satellite system. An original Gibertini in 125cm costs at most 250 euros. You are being offered a Televes for 400+ VAT. For which satellite?

The constant voltage regulators are possibly for the towel radiators in the bathrooms. Remove these completely and let the radiators run electrically. This way you get more out of it and only need one actuator channel and one heating rod each.

I would also swap the ABB heating actuators for those from MDT (if the electrician agrees). These definitely offer a better price/performance ratio.

The whole BA push-button issue has already been addressed. I wouldn’t even know what to do with them. I don’t have a single single- or double-push-button in the house. Where only lighting is really needed, there is simply a motion sensor/daylight sensor, and where there are also blinds (shading), etc., you just make a room controller and still have 1-2 switches/buttons free for the future. Although the shading should of course run completely autonomously, and that generally works very well.

Missing window contacts and motion sensors have already been mentioned several times. If you install too few sensors, you rob the house of eyes and ears (don’t worry, with KNX all data stays within the system and nothing is reported externally). And without eyes and ears, a house can only perform actions on its own to a limited extent. So, in the end, it remains more or less a run-of-the-mill electrical system with fancy push-buttons but little intelligence for a lot of money.

The offer reads like the fear of the unknown. Just don’t give away too much control, I really want to control everything in detail and leave nothing to automation. In a “real” smart home, on the other hand, you rarely press any buttons.

What I also noticed is that far too little 5x1.5 NYM is installed, whereas there is a lot of 3x1.5; two more conductors don’t really make a big difference, and I would at least feed all socket circuits with 5x1.5.

Otherwise, as Matte1987 said, definitely provide empty boxes for presence detectors. Just put bus cables in and leave them plastered over. Better to have them in an unfavorable place than none at all, since everything is already quite advanced. And yes, Kaiser boxes would certainly be top, but before having nothing at all, at least a simple one.

Network, yes, is also not without problems.

Best is to just make a loop in the box and go to the next location, that is the safest.

If the electrician has already done KNX, then he knows this. It’s actually the usual procedure. Saves time and headaches.

However, single outlets are centrally placed on the ground floor and upper floor for an access point, just not on the ceiling but rather near the floor, and then a small cabinet or something similar is placed in front of it. - not yet included in the offer.

All conduits can be found under point 2) Cable routing systems and 3) Flush-mounted installation wiring.

How do you come up with "300€ per double socket"?

Access points near the floor and still in or behind furniture are suboptimal. The devices should be mounted high and free to ensure the best possible WLAN coverage.

3600€ - ~600€ (network cabinet and power strip) = ~3000€ divided among 10 double sockets. I assumed that the 500m of cable is completely used up.

Thank you very much for the detailed information. I have the appointment tomorrow and am confident that we will make progress.