I usually clean up my studio before I start a new painting and I also like to have my tools there in a decent order. In my woodworking shop it can get quite messy, with all the sawdust and parts and tools piling up. Try to get that back in order between jobs too, but its a much bigger challenge than in the studio... Like recycling and building too and understand, that you don't want to go and get shelves from else where :-)
Now that I have a cellar space, I have my stash of building materials out of the way. What I would really love to do, is build my own house from recycled materials. In my London warehouse I used quite a good deal of recycles. It's amazing how it all turns out and some times even better than what you might afford to purchase as a finished product.
Keeping the studio tidy is an ongoing process for me. I'm going to have a decent purge soon.
Having a cellar is a big advantage. As long as its not like here, where its more like some dark moist dungeons underneath. But we still have a decent amount of space... at least one advantage of our "Burg" ;-)