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Rendering extra floors requires significant CPU and GPU power. If you experience framerate drops, reduce the number of windows and high-polygon clutter objects on the uppermost floors. Final Verdict

If you are building a castle or a high-rise, you can "fake" a 5th story using rooftops and the T.O.O.L. mod (by TwistedMexi).

Here is a comprehensive breakdown of why this limit exists, how the modding community handles it, and the best workarounds to make your builds look much taller. Why a "More Than 4 Floors Mod" Doesn't Exist