Enclosing an attached carport w/ concrete slab. The slab is not completely level. Pour concrete over existing floor or install wooden subfloor?
Comfort is generally better with a wooden subfloor, if you have the room for a wooden subfloor. That also allows adding insulation to reduce the heating/air conditioning load (which may be minimal from the floor, given your location.)
Plenty of old houses have floors that slope a lot worse than 1.5&quot; in 20 ft (0.67% if I got the math right) and they work as living space, so not &quot;fixing&quot; it at all as Alaska Man comments is certainly an option, particularly if it's an &quot;even&quot; slope.
i.e. any properly built porch has 1% to 2% slope and most people are unaware of that.