In 1892, his son-in-law, the young architect Professor Max Littmann (1862-1931) joined him, so the construction company of Heilmann & Littmann KG (after 1897 GmbH) came into existence.
In 1891, he joined the contracting business of his father-in-law Jakob Heilmann, thus transforming it into the Heilmann & Littmann general partnership (later becoming a limited partnership), taking charge of the planning department.
Max Littmann | Mary Heilmann | Heilmann & Littmann | Lutz Heilmann | Jakob Heilmann | Heilmann locomotive | Enno Littmann |