The last name Dahl has been synonymous with the word construction for over a century.
John Dahl was born in 1890 and was a plastering contractor for decades. His construction experience was passed down to a number of Dahl's:

Frank Dahl Sr., one of John's sons, was a General Contractor for decades and provided home-building, framing and remodeling services from the late 1950's through the 1980s.

Vernon "Hank" Dahl Jr., John's oldest grandson, had a construction company in the mid-1970s and provided home renovation services up until his retirement. His youngest son, Budd, followed in his Dad's footsteps and has been in construction for over twenty years.

Frank Dahl Jr., Frank Sr.'s son, worked for both his father and his cousin Hank in his early years doing all facets of construction. He and his wife Bonnie started Dahl Property Holdings and brought Budd in to head up the construction team. Between the three principles there are many decades of housing construction experience.