Game wont let me build

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I have been trying to build a base with my friend in the well known green house but it doesnt let me place a fence kit anywhere near the house not to mention inside it. I have looked at a bunch of tutorials on youtube and they all just go and whack a fence kit into the wall while colliding with two different objects and the game does not care. I play on official that might be a key differnce but if playing on official without mods is a problem and you need mods to be able to build a base in d...