Took about 6 hours to put together myself & a helper. Be very careful when installing the door to the stair cabinets, if they are no properly aligned they will rub the stair railing. Trundle bed size is maximum 6", this is accurate. The stairs are easily interchangeable to either side. Only had it for about a week at this point. 3 star is for the difficulty with the door to the stair cabinets