Short answer: it’s usually a little more than just attaching the legs, but not by much. Most outdoor benches ship flat-packed with the seat, legs, side supports, and hardware separated. On a basic two-seat wood or metal bench, the main job is attaching the legs to the seat and adding a lower brace. If the bench has a backrest or armrests, you’ll also bolt those on, which adds a few minutes and a few more screws.
Before you start, check the bench hardware bag and instructions. Many models use Allen-head bolts, washers, and nuts, so the included Allen key is often enough. A socket wrench or a cordless screwdriver with the right bit can speed things up. Lay the parts on a piece of cardboard or a towel so the finish doesn’t get scratched.
The trick to a sturdy outdoor bench assembly is to leave all the bolts slightly loose until everything is connected. Get the legs, seat, and braces lined up, then tighten them evenly. If you tighten one side completely first, the frame can shift and the bench may rock on a patio or deck. That helps keep the whole outdoor bench setup stable. For larger benches, a second person helps hold the backrest upright while you start the bolts, but a simple bench is fine to assemble solo.
So, is it just attaching the legs? Sometimes, yes. A basic bench with pre-assembled ends can be that simple. But most outdoor benches take 15 to 45 minutes, and larger storage or folding benches can take up to 90 minutes. Most people can assemble an outdoor bench in under an hour, even without experience, as long as they work on a flat surface and follow the hardware guide.