Frank L. Blum Construction Company Established in 1923, Frank L. Blum Construction Company has been a trusted building partner to owners across the greater Triad region for generations. With the lowest actively-used general contractor license number in the State of North Carolina - License #18 - our 90-year-old firm has a solid reputation for weathering the most challenging economies, partnering with the most exacting owners, and excelling at the most challenging projects. Many iconic and beloved buildings across the Triad area bear the Blum Construction imprint of fine craftsmanship on the original structure or its subsequent renovation or restoration.