I got an all included kit which contained most of what you've already been told but also had the insulation, pre-built wall system and openings for the doors and windows. We built the sun room a few years ago and pretty much got everything in the kit that we ordered.
What kind of room? Are you adding a sun room? Are you adding an exercise room or a second bedroom? Without some particulars I couldn't tell you what would come in the kit. If you can please let us know some specifics so we can help you out. Thanks!
An example starter sunroom kit might include laminated beams, laminated house and floor plates, glazing system, solar glass, stainless steel screws, sealants, tongue and groove roof deck, hardware, instruction manual and architectural drawings. With this kit you would provide the walls and roofing. This is for a starter kit only.