Grow Domes Are the Future Grow Cabin- It’ s 12’ wide by 18’ long and can be purchased bare or completely fitted with shelves, lights and trays. Various lengths – Grow Cabins are 12’ wide and up to 25’ long. Cabin can be solid or have a window as shown. This is a 280-foot-diameter church that could easily be a Grow Dome. With several floors inside, it’s equivalent to 8 acres of growing space. But year-around growing produces as much food as more than 100 acres. This 280-foot-diameter dome has a floor area equal to 1.4 acres. Note the large entry doors. It’s the perfect building for growing food.