There are plenty of ways to make extra cash. An unusual but recognized trend is renting out storage space. The viability of doing so depends on the location of a point of storage and the willingness of the owner to empty it. Since a shed can be moved on a trailer, it is actually quite common for owners to take an empty shed, send it to someone else’s property without relinquishing ownership of it. For them, renting is often better than buying.
If this have you asking, “How do I rent my shed?” The answer is to list in on a site that is an ad market for niche services. It is easier to use a website than to list an offer in a newspaper because circulations are smaller and the web reaches a broader audience. Pitches might come far away, but the surrounding 50 miles will likely yield plenty of customers.