[villagetinker]

OP, you will have a couple of other steps, ARC approval for your project, and then all of the permits (make sure the contractor gets these). You may want to stop by the local county building department and find out the "ground rules" for this type of project. Things like raising the floor, removing the sliders, A/C, etc., there may be implication on taxes, as well as different building requirements. Pay attention to insulation requirements, electrical requirements, and the glass (or equal) used for the enclosure, going cheap may cost you in the long run. We have not done this but I have seen many threads with comments on these types of projects.