Not difficult to assemble but I recommend extra caulking to really seal it. Using longer and quality concrete screws makes a big difference bolting the floor to the concrete pad. There is also a typo in the specifications list which correctly lists the  cubic  feet as 420, but under coverage lists it as 420 square fee which is wrong. The coverage area for an 8' x 8' shed would be 64 square feet! This error should be corrected in the specs area on this website.