Hello, and then? No one installs it for you or does it at a horrendous surcharge without a warranty because they don’t know the stuff from the internet (even if it was from Villeroy & Boch).
Personally, I was already a bit intimidated to change a faucet (washing machine). The plumber who installed the expensive stuff for me came by and did it for 10 euros.
That way you have a connection
These are the usual arguments of those who submit to the opaque mixed costing calculation and accept that they may (!) be taken advantage of. Everyone has to decide for themselves whether they want to play that game.
At least in urban areas, in my opinion, there are alternatives.
It is simply wrong in this environment that material provided by the builder is not installed or that no one can be found. Reuter has existed for over 20 years, is very accommodating with complaints, and also offers a free craftsman referral service. Fill out the search form and plumbing companies will appear, who obviously no longer want to play the wholesaler’s games and, as I believe, charge a fair hourly rate. I find it difficult to accuse all these companies of shoddy work or of not giving a warranty on their work.
Regarding the topic of connection: why? I want to pay appropriately for the service and if I no longer like the original installer (too expensive, a total pain personally, or simply unreliable), I will change. Then I have absolutely nothing to gain from that connection...
Second question: what do you do if the company that initially did the entire plumbing installation for you has closed down? According to the logic mentioned here, then no plumber should be found to take over the job…
Again, to counter the often-used argument: every good craft work should be well paid. But I am a fan of transparency: I want to know what the installation costs me, what the material costs, so that I CAN decide whether I am willing to pay that. Mixed costing is anything but transparent.
The wholesaler dictates the excessive prices; the plumber must then, in order to compensate and still offer something somewhat acceptable to the end customer, set hourly rates that are no longer cost-covering. From my point of view, he avoids the discussion with the wholesaler and makes the customer pay for it.
No, I am not going along with that, there are alternatives—and to claim that all of them work much worse or have no idea of the trade often seems to me like a justification from those who paid excessive prices, are very annoyed about it, but perhaps do not want to admit that they were taken advantage of. Very similar with electrical/bus systems…
Finally, one more thing. I build with an architect in individual contracts. Accordingly, the above argument should be seen in that light; it may look somewhat different with a general contractor (GU).
But even here: aren’t the interfaces clear and standardized? A pipe with diameter xyz comes out of the wall, the floor, the ceiling, or a water line whose diameter is standardized. That’s done by the plumber. Then comes the branded porcelain, the branded fittings that can handle these diameters. What specific additional knowledge does the plumber who did the installation have compared to the one who connects the appliances?!
In the case of electricity, that would mean that only the electrician who did the installation is also the only one who can professionally connect switches, sockets, and stoves. So when you buy a new stove after 10 years, you seriously go to the same electrician who did the installation because a) connection and b) otherwise no quality or warranty is ensured?! Really?