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We have such a supply shaft in the house. It is basically a double interior wall in the pantry. Heating pipes, water and wastewater, ventilation for the ground floor and upper floor, and electricity for the upper floor run through it.

Thanks for the comments. Then I will wait until the ventilation planning is available in the first draft. I see some difficulties. There is no way to run the ventilation ducts in a straight line from the basement to the upper floor ceiling. Except maybe in the exterior wall above the guest WC on the ground floor and the bathroom on the upper floor. See screenshots. I actually don’t want such deep grooves in the exterior wall like at Vorposten. The heating engineer has the idea to install a complete drywall partition between the guest WC and storage room on the ground floor. So that the ducts disappear there. However, 1. I don’t want a drywall partition behind a shower and 2. even here it wouldn’t be a straight line from the basement to the attic ceiling.

I would swap Child 1 and Work on the upper floor.

I would swap Child 1 and Work on the upper floor.

The comment has come up several times. It was always planned that way. When the time comes, there will be 3 children's rooms.

Thanks for the comments. Then I will wait until the ventilation planning is available in the first draft. I do see some difficulties. There is no way to run the ventilation ducts in a straight line from the basement to the first floor ceiling.

Why not contact the ventilation manufacturer(s) and ask for a design? They know their systems best. At least that’s what we did and then just dropped the design of our choice into the tender documents so that the HLB can offer and install it. The acceptance is then done directly by the manufacturer, for example Zehnder.

Just write to the ventilation manufacturer(s) and ask for the planning. They know their systems best. That's at least how we did it and then just slapped the planning of our choice into the tender documents, so that the HVAC contractor can offer and install it. The acceptance is then done by the manufacturer directly, for example Zehnder.

Thank you for the hint. How long did the feedback take for you?