- GH Group, Inc. Builders/Construction Managers CA Contractors Lic. 521142 GH Group, Inc. is a building, construction management and fixturing firm, specializing in com-mercial and retail projects. From its inception in 1987 as a one-man operation, Gary Hanstedt, a licensed general contractor, has developed GH Group, Inc. into a team of experienced professionals committed to excellence and hard ...www.gh-group.com