You aren't going to be able to grow lettuce in Florida thru most of the summer, it will bolt too fast b/c of the heat. (A few varieties do better at resisting this than others, but really lettuce is not a midsummer crop in hot areas). But for the earlier and later seasons, sure.
If it is right along the house, don't try to grow your lettuce (or much of anything else) in the ground, put it in *containers*, windowbox containers work well for lettuce but really anything of sufficient size will do. The ground itself will be WAY too dry there, and you don't wanna be irrigating right along the house foundations if you can avoid it; also soil right along the house is typically *terrible*. Lettuce does real well in self-watering containers, otherwise an auto-watering drip or siphon or wick system is wise as lettuce has a poor sense of humor about being forgotten.
The other advantage of containers (besides giving you good control over soil quality and watering) is that you can move them as necessary, for instance if you discover the area is becoming too hot during the day or if later in the season with slantier sun they're getting too much direct sun. Or if you discover that too much stormwater pouring over the eaves of the roof is flattening the plants.
Good luck, have fun,
Pat
