Depends on the material. Resin sheds usually come with a floor panel and can sit on any flat, level surface. Metal sheds usually do not — they want a base you prepare first, most often a concrete pad or a pressure-treated timber frame. The spec table on each listing says which. If that row is missing, the maker did not publish it.

A deck box or a storage bench is 20–40 minutes with a screwdriver. A walk-in shed is a half day for two people, and it is much easier with two — the wall panels are long and awkward alone. Tool chests arrive built; you fit the castors.

Weather resistant, which is not the same thing. Rain runs off and the contents stay dry, but these are not sealed containers — air moves through, and in a cold snap you can get condensation inside. Cushions and tools are fine. Paper, electronics and anything that rusts want a lid box inside the box.

Anchor it. Most sheds ship with an anchor kit and every maker tells you to use it — an empty shed is a large light box with a flat side to the wind. Deck boxes are heavy enough once loaded, but anchor those too if you are on an exposed roof deck.

Large items come by freight and arrive on a pallet at the kerb, not in your yard. Plan for someone to be there and for a way to move it — the cartons are heavy and long. Shipping is a flat $6.90, free on orders $200+, and you have 30 days to request a return for unused items.