It took about a day to assemble, however we did have a 2 year old trying to help also! Instructions were so easy! Everything you need was provided for you. Nice and sturdy for our little guy, the only thing is that the slope of the slide is pretty steep, our little guy is almost 3, he sleeps on the bottom bunk. He is getting use to the slide but we have to help him slide down. I’m sure older kids will be just fine!