A 10x12 is where it starts to feel like a real room rather than a closet. That's enough for a reading nook, a craft table, some comfortable seating, and shelving for your stuff. If you want to spread out or have friends over, a 12x16 or larger gives you the space to make it feel like a genuine getaway.
The key with a she shed is that it's your space. It should feel intentional, not cramped. Think about what you want to do in there, add a couple feet of buffer, and that's your size.



