The short version
The names describe shape, position, and infill — not legal categories. Whether it is called a lanai, a screen room, or a pool cage, if it is an aluminum-framed enclosure then building, replacing, or structurally altering it is work for a licensed Structural Aluminum or Screen Enclosure Specialty Contractor, and it needs a permit.
The terms, one by one
Lanai
Borrowed from Hawaii and thoroughly naturalized in Florida real estate. A lanai is a roofed outdoor living space attached to the house — typically under the home's own roofline or a solid roof extension, with screened sides. In listings it usually implies a covered, finished space rather than a bare screened patio. Structurally, the screened portion is an aluminum enclosure.
Screen room
The most literal term: a room-sized enclosure with screen walls, usually attached to the house over a patio or slab. It may have a screened roof or a solid panel roof. When people say "screen room" they generally mean something smaller and more room-like than a pool cage — enclosed, furnished, used as living space.
Pool cage / pool enclosure
A large screen enclosure built over a swimming pool and deck. Usually the tallest and widest structure of the group, with long spans, big openings, and a screened roof. "Cage" is the everyday word; "pool enclosure" is the more formal one. Same structure either way.
Patio enclosure
A catch-all for enclosing an existing patio or slab. Overlaps heavily with "screen room" — the difference is usually just which word the homeowner or the salesperson happens to use.
Sunroom
Where the terminology genuinely diverges. A sunroom implies glass or vinyl panels rather than open screen, and often some degree of climate control. Aluminum-framed glass, window and door enclosures, and vinyl panel enclosures fall within the structural aluminum and screen enclosure scope. But once a space becomes fully conditioned, insulated, habitable room addition, it can cross into work belonging to other trades — worth confirming with the building department early, because it changes who can permit it.
Carport and roof-over
An aluminum carport is a covered, usually unenclosed structure. Mobile home roof-overs and pre-formed panel-post and beam roofs are explicitly within the structural aluminum scope. These are frequently sold alongside enclosure work by the same crews.
Quick comparison
| Term | Typically means |
|---|---|
| Lanai | Roofed, house-attached outdoor living space with screened sides |
| Screen room | Room-sized screened enclosure over a patio or slab |
| Pool cage | Large screened enclosure over pool and deck, screened roof |
| Patio enclosure | General term for enclosing an existing patio |
| Sunroom | Glass or vinyl panels rather than screen, often semi-conditioned |
| Carport / roof-over | Aluminum cover, often unenclosed; includes mobile home roof-overs |
Why the label does not change the rules
It is tempting to think a small screen room is somehow less regulated than a pool cage. It is not. Florida looks at whether you are building, attaching, or structurally altering an aluminum enclosure — not at what the brochure calls it. All of the following need a permit and a licensed contractor regardless of the name on the contract:
- Building any of these structures new
- Replacing or reshaping the aluminum frame
- Changing size, footprint, or geometry
- Changing how the structure attaches to the house or slab
- Adding a screened or panel roof
And in every case the structure has to be engineered for Florida Building Code wind loads at that address. A small screen room is engineered for the same wind that hits the pool cage next to it.
The one consistent exception across all these names: a like-for-like rescreen of an existing, undamaged frame is maintenance. New mesh, same structure, no permit, no specialty license.
One license, one exam, and one body of knowledge sits behind all three names. The free practice quiz covers all ten official content areas — the same material whether the job is called a lanai, a screen room, or a pool cage.
Why this matters when you are quoting
Customers describe what they want in whichever word they grew up with. Someone asking for a "bigger lanai" may be describing a structural extension that needs new engineering and a permit. Someone asking to "fix the pool cage" may mean rescreening two panels, or may mean replacing corroded uprights — one is maintenance, the other is permitted structural work you cannot legally do unlicensed.
Getting that translation right on the first call is the difference between an accurate quote and a job that turns out to require a permit you cannot pull.
Definitions and scope are interpreted differently by individual city and county building departments and change over time. Confirm with your local building department and the DBPR before quoting or beginning work.
One license covers all of it
Lanais, screen rooms, pool cages, patio and vinyl panel enclosures, carports and roof-overs all sit inside the Florida Structural Aluminum or Screen Enclosure Specialty Contractor scope. FLPassPro preps the DBPR Trade Knowledge exam that license requires — 288 questions, all 10 content areas, every answer explained.