How long your sunroom will last depends on the materials used during your sunroom build, the weather conditions, and your maintenance routine.
Generally speaking, if you use high-quality products, regularly maintain the exterior of the sunroom, and avoid damage during extreme weather events, you can expect your sunroom to last 10 – 20 years. At that time, it will become necessary to replace or upgrade the sunroom so you can continue to enjoy the outdoors indoors.