Outdoor structures have enjoyed rapid growth in the last five years, with pre-engineered pergolas at or near the top of the list, according to the vice president and chief operating officer of Structureworks Fabrication, in Fredricksburg, Va. With homeowners interested in durability, attention has shifted from traditional wood structures to those made with materials, such as fiberglass, aluminum, and steel, that are capable of standing up to weather without much maintenance. Millennial buyers also are pushing the market toward a different aesthetic. In this survey of four recently launched designs, Remodeling shows the evolution of an old favorite. Read More