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A lanai is a covered patio with open walls, while a Florida room has sides made of mesh screens or windows, with or without partial low walls. In addition, lanais often use concrete or other patio flooring, while Florida rooms may have more indoor-style flooring like tile or wood. Both allow you to enjoy the outdoors without being in the direct sun, but a lanai doesn’t offer any barrier against insects or debris.

While there is no one size that’s considered best, the sunroom size that’s best for you will come down to the size of your home and how you want to use your sunroom. Smaller sunrooms under 120 square feet provide a nice semi-outdoor sitting area, medium-sized sunrooms between 120 and 200 square feet can house an outdoor dining area and a small area for additional seating, and large sunrooms over 200 square feet can serve multiple purposes and even include an outdoor kitchen.

Yes, but ensuring the deck has a solid foundation with adequate footings is critical before building, as the weight of a sunroom will put significant pressure on the structure below. Even if your deck is properly constructed, it may not be able to handle the extra weight. While some basic, lightweight, prefabricated sunrooms can sit on a deck with a strong existing foundation without additional supports, in many cases, the foundation and joists will need reinforcement. It is always best to have a structural engineer perform an inspection to evaluate the deck's quality and structural integrity. A professional can help you decide if reinforcement is sufficient or if it's better to tear down the deck and start over.

In most parts of the U.S., adding a screened-in porch requires a building permit. Since this type of project often involves structural work and changes to your home’s footprint, homeowners should adhere to local guidelines. That said, permit rules can vary widely depending on where you live and how extensive the project is. Before you start sketching out plans or ordering materials, check in with your city or county’s building department to avoid headaches, fines, and potential structural issues down the line.