Custom Windows is probably the biggest vendor in the TV for Lanai enclosures. We are using Fullview for our lanai windows. There are many options; single pane, double pane, vinyl frames, aluminum frames, Raising the floor or leaving the existing floor height, etc. Options and size of your lanai make it very difficult to give a ball park price.
A couple things to consider, will you want additional electrical outlets as part of the project? You also better consider adding A/C. You will probably need it. If you plan to heat/cool you will also need to add insulation in the attic above lanai.
Also consider if you raise the floor to eliminate the existing step down into the lanai your taxes will increase based upon the additional square feet of "living area".
I would not hesitate contacting either of the above companies to get a quote even if you are not ready to move yet on the project. I did the same thing so I could use it for planning. Just remember the prices seem to increase by leaps and bounds the longer you put off the project.
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