Preparation of smart home in new construction

Purely out of interest: What would your mentioned variant roughly cost, ? So just star wiring for shutters and bus lines in a few sockets. Plus conventional wiring initially. I know, hard to say for a fictional house. But is the surcharge for such wiring much more expensive than a conventional installation?

500-1000€

Just out of curiosity: What would your mentioned variant roughly cost,

That is not only hard to estimate but impossible. Just for the standard installation of the same scope alone. Ask three electricians, and you will get three completely different numbers.

So pure star wiring of roller shutters and bus lines in a few sockets.

Wrong approach. Either you do everything in star topology and bus to every socket or you better not do it at all.

Halfway is somehow also stupid.

First, conventional wiring.

You don’t need anything "additionally," "first of all," "maybe," or "a bit." Everything in star topology, bus to every socket, and the terminal connection as you like in the control cabinet. Whether done in a conventional way or somehow differently.

The extra cost will be at least €1000 just because of the bigger cabinet and more cables/hours.

Wrong approach. Either you do everything with star wiring and a bus to every socket, or you better not do it at all.

But if I already know that we don't want/need to switch every socket in the future, why lay a bus line everywhere? We don't want to make the entire house smart, but only control, for example, roller shutters by wind sensor, as a group or centrally per floor. Or are there better alternatives for such applications besides KNX?

But if I already know that we don’t want/need to control every socket in the future, why lay bus lines everywhere? We don’t want to make the whole house smart, but for example control roller shutters via wind sensor, as a group or centrally by floor. Or are there better alternatives for such uses besides KNX?

Even if hardly anyone wants to hear it here. Wireless. For such little toys and minor things, that’s totally sufficient. Add 1-2 actuators to dim a lamp via app and switch the floor lamp in the corner.
I retrofitted something like that at my parents’ place. They also desperately want a “smart home.” Whenever I hear that term... If you want a provider I used for that, just send me a PM.

I bet 90% or more of the house installations with KNX aren’t really smart either. They just use the name to make money. To become a “certified KNX partner,” you only need exactly one training course. At least that was the case 5 years ago.
Friends also had their house fully equipped with it. Star wiring? Not at all. One supply line 3x1.5 per room’s sockets. Congratulations. The only smart thing about it is the crazy light switches in black with colorful dots. What they paid for that, I could have done with a third of the money in a conventional way. And a nice vacation probably still would have fit in.
The problem is, many have no idea about the subject at all. That’s nothing shameful. What’s shameful is that a lot of people are being ripped off because of it.

If you’re interested in what’s really possible and deserves the term “SmartHome,” I’d follow the house construction thread by .
Apparently, someone who really knows their stuff is doing it there. At least I caught a post about it somewhere within the X pages and have been eagerly waiting for the electrical installation ever since.

But if I already know that we won’t want/need to control every socket in the future, why run a bus line everywhere? We don’t want to make the whole house smart but, for example, only control blinds via wind sensor, as a group or centrally per floor. Or are there better alternatives for such applications besides KNX?

If you want a smart house and smart KNX and not what danixf describes (meaning KNX unsmart), then you need the bus everywhere because you can’t connect just sockets to the bus line. Otherwise, I’m also of the opinion that you don’t need all that. Just have any random controller installed for the blinds and that’s it. If you then want to do some lighting or something, you take, for example, Hue. It’s then all far from smart but might be sufficient for your purposes.