A deck in this part of the state gets used hard in April and October and sits empty in between. July is too hot, and the evenings that aren't too hot belong to the mosquitoes. A screened porch takes the same footprint and turns it into a room you use from March to November, which is why it's the single highest-value conversion we do.
The question that decides everything is whether the existing structure can carry a roof. A deck is engineered to hold people and furniture — a live load pressing down on a frame that's free to move. A roof adds dead load permanently, plus uplift in a storm, and it concentrates that load on specific posts rather than spreading it evenly.
So we get under the deck before we quote. We're looking at footing size and depth, post dimensions, beam spans, and how the whole thing is tied to the house. Sometimes the answer is that it's ready. More often we're adding footings and upsizing a few posts, which is real work but far cheaper than starting over. Occasionally the frame is too far gone and the honest answer is a rebuild — we'd rather say that than find out at the framing stage.
Once the structure is settled, the choices that matter are the ones you'll notice in year three. Screen should be tensioned in removable frames, not stapled to the framing and trimmed over: a torn panel becomes a twenty-minute fix rather than a carpentry job. Pet-resistant mesh is worth it if you have a dog that leans on things. No-see-um mesh is worth it near water.
Finish the ceiling. An exposed-framing ceiling reads as unfinished no matter how clean the carpentry is, and it's the surface you look at most from a chair. Stained tongue-and-groove or painted beadboard both work, and both give you somewhere to mount a fan and recessed lights, which are the two things that make the room usable in August.
Figure two to three weeks of build time for a conversion, plus permitting. We'll tell you what county turnaround looks like when we quote, because that part isn't ours to control.