The Gallagher House, built in 1917 as an American Foursquare house with Craftsman details, is a local example of an early 20th century upper-middle class home. The two-story frame house features a hipped roof with a central dormer, exposed rafter tails, and a full-width front porch supported by box columns, with the construction year shown in raised plaster numbers on the dormer. Vincent Bernard “V.B.” Gallagher and his wife, Mary Ann “Mamie” Gallagher, built the home for their large and active family. Gallagher was a civic and business leader who owned Wylie's oldest continuously operated business, the Wylie Insurance Group, served as a director and officer of the First National Bank of Wylie, and held offices on the school board after the town's first schoolhouse was built. His most influential civic work was promoting construction of a dam on the East Fork of the Trinity River, an effort by him and the Commercial Club of Wylie that provided the most effective solution to Dallas' water supply problem and led to the reservoir now called Lake Lavon. In 1943, after Gallagher's death, Ollie and Emma Addington moved into the house and, during more than 20 years of ownership, made it a center of community life by hosting many events and social gatherings. Ollie Addington was a Lions Club member, school board trustee, and two-term city councilman, while Emma Addington was the first president of the Wylie Garden Club and served in leadership roles on various church committees.