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A prefab sunroom will last for between 10 and 20 years in most cases, although you could get up to 50 years out of a high-quality prefab sunroom. In addition to material quality, your prefab sunroom’s lifespan will depend on the foundation type and the climate in your area. Extreme weather and expansive soil can decrease the expected life.

Even if your deck is properly constructed with a solid foundation, it doesn’t always mean it can handle the extra weight of a sunroom. Always call in a structural engineer to perform a deck inspection to evaluate the quality and structural integrity of the deck before building. You may need to reinforce the foundations and joists, and with decks in poor condition, it might be better to tear them down and start again. A pro can help you decide.

Yes, a sunroom will require a permit. You may just need a general construction permit for a screened-in porch or solarium. For a three-season room with electricity and a four-season room with electric, heating, and cooling, you’ll need additional permits for each of the utilities, as well as a roofing permit.

A screened-in porch can add value to your home, but it won’t count toward the total square footage at an appraisal or when it comes time to sell. A screened-in porch is not fully enclosed, usable year-round, insulated, or heated or cooled, so it doesn’t meet the requirements of livable square footage in most locations.