If you put the technology in the extension, you have a more expensive additional effort, also regarding the roof. I don’t see a proportional added value in that. However, you should just discuss that with the BU. How the noises from the washing machine and dryer will be towards the bedroom, I cannot assess. I find some fundamental objections to the topic of noises and smells exaggerated; you have to consider yourself whether to soundproof everywhere and maybe as protection still build the 300sqm villa so that everything is separated. The bathroom: the bathroom has a width of 2.40... should be enough for a linear arrangement. However, you could push the upper floor again to the west above the door. Possibly only halfway and then execute the flat roof only as a strip? Half a meter would be enough there. Then you would have 2.90 in width. Storage room window would then barely work or also be somewhat smaller (instead of 80 only 60 width). In the garage, a door to the back is still missing. If I have time and feel like it tomorrow (and my husband lets me ), then I’ll do the 17cm wall in the utility room (the room should be enough for technology) and the kitchen open to the west. Also the house up to the 8-meter line and the bathroom... The proposals with the stairs by @Karlstrasse will not work. And I don’t need to reinvent the wheel either :P There are many other approaches that I am mentally playing through. However, either the upper floor with the east view in the bedroom doesn’t work, or something else becomes a problem. But now I’m stuck with the open-plan room and the stairs, because that was the wish. By the way, the garage is just under 6 meters wide, I just had to work with space between 2 buildings. Regards