He was the fifth child of sculptor, metal caster and Professor Georg Ferdinand Howaldt and began his artistic studies in his father's workshop.
After 1880, he managed all of the company's commissions and, following his father's death, operated the foundry as well.
While installing his statue Fame on the glass dome of the Dresden Academy, he fell from the scaffolding.
His long-term employees joined with sculptor Paul Rinckleben [de], took a lease on the shop, and completed all the works in progress.
Hermann's son Ferdinand (who had learned metal casting at the Braunschweig University of Technology) became the manager in an effort to save it but, three years later, had to declare bankruptcy.