Yes, and when I think about it carefully, nothing is allowed to go where the heating engineer is now gnashing, so that he no longer has the whole wall to himself :-(
Well, Hotzenplotz is a construction site in itself (i.w.S.d.W.), if you ask me. He is usually too lazy or incapable to think for himself. You can tell that in the execution.
Size of the technical room Simply add up the necessary floor space and draw the whole thing into your plan. I would say 8 sqm is already full. Our room is bigger. There are still tools and stuff in there. Besides the floor space, you also need maintenance space and clearance for the electrician - which will be measured afterwards.
(The 14-year-old probably won't come anymore in 2 years if he belongs to a clique )
That is not said. The teenagers who have been coming to this house for 4 years (then 12 and 16, now 16 and 20) every 2 weekends and during the holidays have now also formed a circle of friends here and really come regularly. Only when they come, youth hostel immediately forms, because the local friends quickly stay overnight, etc., so that from 2 teenagers on the biweekly weekend there are gladly 4. I would also sketch the planned garage driveway. It could become quite a hassle and cost a considerable amount of enclosed property area.