This should walk you thru the process: https://www.diynetwork.com/how-to/outdoors/patios-and-decks/how-to-screen-in-a-porch
check with your county extension office, some areas need permits to build, and insurers the structure is sound.
Hi Kathy - Not the DIY, but this is how we transformed our back porch from a sad space to a gorgeous and relaxing oasis. I hope this helps with some inspiration. Hugs, Holly
I need a 4 season room. Maybe a prefab room or is it better to build? The back of our house is high so we won't be on a slap.