As put in question… lol I have leveled everything to 20. (so that i can react fast on new buildings).
Would it be needed to level the level5 forge that’s underneath my level 10 barrack?
If you want everything to level 20 (and Barracks to level 10), yes, you need to move the barracks temporarily onto either another farm, mine, forge or training camp while you level up the forge hiding underneath it.
P.S. I recommend you choose a building you aren’t currently using. 
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