We had an estimate for enclosing --installing glass sliders ---and split A/C system march of this year ----We have pavers on the Lanai even with the door track --
Called the County inspector and he told us as of 1/1/15 if you want to A/C that area --you must add electrical outlets and have a Moisture barrier on the floor
then pour concrete----in our case we would need to remove the pavers install the barrier then either replace the pavers or pour concrete ----
Still pondering !!!!!


Good Luck
__________________
Arrived Buttonwood in Oct 2010
