We doubled it! We expanded the catio and now it's 21' x 8', the purrrfect size for zoomies. We hired the same carpenter to come back and build this expansion. He carefully matched up all the details and it looks seamless. As before, we took over finishing the inside which has many new details. We ended up removing nearly everything from the old section. Most of those parts we arranged in a new way to create a whole new experience for the cats. The large hollow log always a popular kitty hangout is seeing even more traffic now that it's at eye level. Another great addition is the sliding glass door. It's so nice to walk right out into the catio without having to go around the back corner of the house! Also new is a rustic table and chairs that the humans love!