All the needed parts were included in the product which arrived in two packages. One contained the polycarbonate panels and clear plastic flat pieces. The second pack contained the aluminum extrusions and hardware. Everything was well marked and extra bolts and nuts were supplied! By carefully following the pictorial instructions in order everything went together smoothly. When bolts did not fit easily into the holes I just loosened some of the others that were already started and then they went right in! After all the bolts were started I loosened and re-tightened them and the whole greenhouse became really solid and stable. I spent more time getting the base ready for assembly than I expected but having a good base really made the rest of the assembly very easy. I could probably have done it completely by myself but having a helper made it much easier.