… I once looked up the so-called study from a university in Colorado on YouTube… it’s always very suspicious when you search for a keyword like “aerosols” here and immediately relevant videos pop up that somehow sound like aluminum + hat… in the end, though, these videos don’t actually tell you anything about aluminum + hat, they just want to tell you (in times of Corona) that “dangers from viruses” are invisible in public, but the videos also describe the solution, namely using the toilet lid.
So I would just leave the church in the village, rather deal with long pipelines ;) … no, joke aside: water vapor when opening the dishwasher also poses a danger, but there is no lid for that. Getting up in the bathtub under the sloping roof is also dangerous, obviously even without lasers…. There is a heating program etc. for legionella.
So: all good. Plan your bathroom as you imagine it… but plan the stairs according to minimum standards and with the corresponding stairwell, then at least it’s safe, and you can get furniture upstairs.
If a layperson starts planning a house, the top rule is: always plan more than necessary. The extra centimeters will be taken away by the professional planning through masonry, plaster, and DIN standards anyway. And everything wants to fit that you draw so cramped.
By the way, I asked about the furnishing because I can hardly imagine the all-in-one room. The dimensions for kitchen and living are a bit tight, even though the room is large. Also, there is no cloakroom. Enough has been said about the doodads around the stairs.
But first of all, fitting the title of this thread, I would swap the office and utility room first.