1 Allergies are increasing. They affect as many as 30 percent of adults and 40 percent of children.1.  Allergic disease, including asthma, is the fifth leading chronic disease in the U.S. in people of all ages. It is the third most common chronic disease in children under 18 years old.1.
There are a lot of variables: Is a new deck required? Would you like a three season or all-season? Is there an obstruction, for instance a water spigot, that needs to be moved? An installed 12 x 12 three season sunroom will start around $15,000 while all-season sunrooms will start around $25,000.
Building permits are required with sunroom additions. Pre-fab kit sunrooms will cost less than a stick-built addition. Not necessarily. Even though sunroom additions cost less per square foot and lack cost-drivers like bathrooms, sunroom builders can easily lard up your purchase with unwanted extras..