What I did on my summer vacation. :-)
I call it the Sharn because it's too big for a shed and too small for a barn. 20'x24' with 10' walls.
It's purpose for the time being is to store everything that is now packed like sardines in my garage, and then some. Hopefully this will allow me to have a shop and/or drum room in the garage. Future plan are to run electric out to it so it can become the shop/brewery/bat-cave. :-)
The front looks a little goofy right now. Try to picture a flat, slanted overhang/awning coming down from about soffit-level to the horizontal trim board running above the doors. I'm also still undecided on whether to have a deck-way from the door thresholds to grade, or bring in gravel and fill it.
That transparent section running under the soffit overhang (both sides) was my idea for clerestory windows to allow light into the building and it works very well. They're made from corrugated polycarbonate roof panels.
It's post and beam construction so I can add future windows pretty much anywhere I decide to whenever I determine its actual purpose in life. :-)