We have just a small tin shed, which has had a variety of garden stuff crammed into it over the last 15 or so years. It leaks so its not a great power tool destination, but I think they will be fine if they are up high.
I was cleaning it out yesterday and on the spur of the moment I decided to turn some old decking into a floor. Its sitting up on some risers made of garden stakes. I took this very much D grade handyman job into the realms of C minus by adding a shelf.