Costs for the heating & sanitary trade

: So I suspect a defensive offer. He seems to be doing so well that he only wants to carry out the order "at a premium." I must be glad that those I contacted simply declined. I almost think it's not worth going through individual items with him anymore. To the files and move on.

By the way, I'm going with this one now: I hope that the execution goes just as well as the preliminary discussions. I received the two outstanding offers yesterday, but one was simply too incomplete and the other about 10% more expensive with a poorer selection of sanitary fixtures.

one quick question: how is the controlled residential ventilation installed at your place? In the concrete ceiling? Is that position 3.6 in the offer?

Thanks!

No, the original plan was to install the ductwork for the ground floor in the floor structure of the upper floors, as well as the installation for the upper floor in the suspended ceiling of the attic. Now, for aesthetic reasons, we are considering switching to floor outlets for the supply air on the ground floor. But it’s still a bit problematic regarding the installation in the floor structure of the ground floor. There is thermal insulation planned on the floor slab here (I don’t have any under the floor slab) and the ventilation pipes should also be insulated, otherwise you get cooled supply air. The Valloflex basic package includes the piping and two air distributors plus accessories. But it comes with round pipes; I will probably have to switch to oval pipes. It is also possible to install it in the concrete ceiling, but then it has to be cast thicker = additional costs. I think my general contractor wanted 4000 EUR for that; so I preferred to take the ceiling height increase for half the price and integrated it into the floor structure.

Ok, thanks for the quick response. We will have to weigh it again. My preference would be in the ceiling, and with individual awarding, those few extra centimeters of concrete hopefully won’t be that expensive.

How much additional floor buildup is needed otherwise approximately? We have planned a few extra centimeters of ceiling on purpose, but I would like to keep as much of it as possible...

So the flat ducts are 60mm. Whether you need the full thickness more or just a little more should probably be clarified with the structural engineer. Possibly your ventilation installer simply knows from experience how much more is needed.