What Is a Florida Room?
A Florida room is an enclosed room off the back or side of a house, glazed or screened on most of its walls, built to be used in warm weather without air conditioning. The name is regional rather than technical. In Florida and across the South it is what people call the glassed-in porch that a builder elsewhere would call a sunroom, a sun porch, or a three-season room.
The defining feature is the enclosure. Wikipedia's entry on sunrooms notes that screens are a fundamental aspect of a "Florida room", and jalousie windows are often featured. Jalousie windows are the louvered glass slats that crank open like a set of blinds. They ventilate beautifully and seal badly, which is the whole story of the Florida room in one detail.
Florida room vs sunroom
People use the two terms interchangeably, and mostly that is fine. Where they differ is in how much weather the room is built to keep out.
| Florida room | Sunroom (general) | Four-season room | Screened porch | |
|---|---|---|---|---|
| Typical enclosure | Screens or jalousie windows | Glass, often insulated | Insulated glass | Screen only |
| Heated and cooled | Rarely | Sometimes | Yes, on the home's system | No |
| Usable in winter | No | Sometimes | Yes | No |
| Counts as square footage | Almost never | Only if four-season | Usually | No |
A Florida room sits at the informal end of that range. A sunroom is the broader category, which includes rooms built to a far higher spec. Every four-season room is a sunroom; almost no Florida room is a four-season room.
The other common relatives: a lanai is the Hawaiian and Florida term for a roofed, often screened outdoor space, usually attached to the house and frequently around a pool. A solarium is a sunroom glazed on the roof as well as the walls. A sun porch is the older Northern name for the same idea as a Florida room.
What a sunroom actually is, by the standard
There is a real technical definition, and it explains the whole square footage question. The sunroom industry specification, AAMA/NSA 2100, defines a sunroom as:
A one-story structure attached to a dwelling with a glazing area in excess of 40 percent of the gross area of the structure's exterior walls and roof.
More than 40 percent glass. That is the line between a sunroom and an ordinary room addition with big windows.
The same standard sorts sunrooms into five categories, and the categories decide whether a room can ever count as living space. Four of the five are thermally isolated, meaning the original exterior wall of the house is still there and the sunroom sits on the far side of it. Only Category V is "designed to be heated and/or cooled and open to the main structure."
A typical Florida room with jalousie windows and no heat is a Category I or II: thermally isolated, enclosed with screening or simple glazing. That is not a knock on it, it is what the room was built to be. The sunroom square footage guide has the full category table and what each one means for an appraisal.
Does a Florida room count as square footage?
Almost never, and the category system above is why.
A home's gross living area, measured under the ANSI Z765 standard that Fannie Mae has required on most conventional appraisals since April 2022, has to be finished, above grade, tall enough at the ceiling, and heated by a conventional permanent system. A Category I or II Florida room fails the heating test immediately, and usually the finish test as well, since jalousie windows and an uninsulated slab are not built to the standard of the bedrooms down the hall.
A Category IV room fails too, and this one surprises people. It has heat and cooling, but on a separate system, with the house's original wall still between it and the rest of the home. It is conditioned, but it is not part of the home's conditioned space.
Category V is the one that can count. Open to the main structure, on the home's own HVAC, built on a proper foundation, finished and insulated, and permitted. At that point an appraiser measures it to its exterior walls and adds it to living area like any other room. The sunroom square footage guide walks through that test in detail, including the permit and foundation requirements.
The tax record trap
County assessors often fold a Florida room into a home's total square footage on the tax card, and listing agents repeat that number. That does not make it living area. Assessment records are frequently outdated or were never measured to any standard, and an appraiser measures the finished, heated footprint independently. This is one of the most common reasons two square footage figures for the same house legitimately disagree, which how square footage is measured covers more broadly.
If you are buying a home in Florida or the Southeast and the listing square footage looks generous for the layout, an uncounted Florida room folded into the total is a likely explanation. Measure the heated rooms yourself with the house square footage calculator and keep the Florida room in its own bucket.
It still adds value
Not counting toward square footage is not the same as counting for nothing. An appraiser handles a Florida room with a separate line adjustment rather than folding it into the price-per-square-foot math, so a house with a pleasant one can appraise higher than an identical house without. The value simply lands somewhere other than the living area figure.
That is also why comparing two listings on square footage alone can mislead you. Two homes advertised at 1,800 square feet are not the same house if one of them is counting a Florida room and the other is not.
How to measure a Florida room
Even though it usually will not count toward living area, you still need the area for flooring, screens, paint, a ceiling fan, or a window-unit air conditioner.
- Measure the interior length and width at floor level, along the baseboard or the sill plate.
- Multiply for the area. A 12 by 14 Florida room is 168 square feet.
- Watch the roof. Many are built under a shed or pitched roof with a low outer edge. For living-area purposes only the part with a 7 foot ceiling counts, and nothing under 5 feet counts at all.
- Keep the number separate from the house total until you know which category the room falls into.
The calculator above handles any size, the sunroom square footage guide has a size table for common dimensions, and the square footage chart covers the full set of room sizes.
Converting a Florida room to living space
Turning a Category I or II Florida room into a Category V that counts is a real construction project, not a weekend upgrade. It needs insulated glass in place of the jalousies or screens, insulated walls and ceiling, a foundation that meets code rather than a patio slab, the home's HVAC extended into the room, and a permit with an inspection.
The cost of doing all that is often close to building a new room addition, which is worth knowing before you start. If the goal is simply a nicer space to sit in, leave it as it is. If the goal is square footage on an appraisal, price the full conversion honestly and compare it against an addition.
Frequently asked questions
What is a Florida room?
A Florida room is an enclosed room attached to a house, screened or fitted with jalousie windows, built for warm-weather use without heating or air conditioning. The name is a regional one used mainly in Florida and the South for what other parts of the country call a sunroom, sun porch or three-season room.
What is the difference between a Florida room and a sunroom?
Sunroom is the broader term. A Florida room is one kind of sunroom, at the informal end: screens or jalousie windows, no permanent heat, and not usable in cold weather. A sunroom can also mean a fully insulated four-season room on the home's HVAC. Every four-season room is a sunroom; almost no Florida room is a four-season room.
Does a Florida room count as square footage?
Almost never. To count toward gross living area under ANSI Z765 a room has to be finished, above grade, tall enough, and heated by the home's permanent system. A typical Florida room has no permanent heat and is not finished to the home's standard, so it is excluded and reported separately, whatever the tax record says.
What is a jalousie window?
A jalousie window is made of horizontal glass slats that crank open together like a louvre. They were standard in mid-century Florida rooms because they give almost complete ventilation. They also seal poorly against air and water, which is exactly why a room fitted with them cannot be part of a home's conditioned living area.
What is the difference between a Florida room and a lanai?
A lanai is a roofed outdoor space, often screened and frequently beside a pool, and it is typically more open than a Florida room. A Florida room is enclosed on its walls. Neither counts toward a home's square footage unless it has been rebuilt to full living-space standards.
Can a Florida room be converted so it counts as square footage?
Yes, but it is a full construction job. It needs insulated glass, insulated walls and ceiling, a code-compliant foundation, the home's central heat and air extended into the room, and a permit. That is the difference between an AAMA/NSA Category I or II room and a Category V one, and the cost often approaches that of a new addition.
Why does my tax record include the Florida room but the appraisal doesn't?
Assessors sometimes count a Florida room in a home's total even when it does not meet the appraisal standard for living area, and tax records are often outdated or were never measured to ANSI. An appraiser measures the finished, heated, above-grade footprint independently, so the two figures can legitimately disagree.
Related guides
Does a sunroom count as square footage, do porches and decks count, what counts as square footage, the ANSI Z765 standard, and the house square footage calculator.