The brand new Harvest Hobby 10' x 20' Greenhouse Kits are truly a work of beauty and of a true lifetime value. Your satisfaction is guaranteed! Other greenhouses in this price range typically have polycarbonate panels 4mm thick, while the Harvest Hobby Greenhouse comes standard with 10mm thick Double Wall Polycarbonate on the walls and roof. When you compare greenhouse widths, theirs are usually only 8' to 8.5' wide. With Harvest Hobby Greenhouse you get over 10' of greenhouse width. And along with the added height and width, you get 20 feet of greenhouse length. 6 roof vents and a powder-coated aluminum frame round out the standard features found in this incredible garden structure. And that's not even considering the extra optional Accessories that are available to make this a one-of-a-kind hobby greenhouse that you can be proud of.