In 1952, De Vlaming started his own firm in Amsterdam. In 1957, Salm joined as a partner. In 1967, the partnership was expanded to include Fennis. The partnership was converted into a private limited company in 1975. In 1981 the management expanded with ir. Dingemans. In the same year a branch was opened in Utrecht. A separate company was established for interior design under the name De Vlaming, Salm & Fennis Interiors BV. Among other things, the firm designed ship interiors for the Holland-America Line. In the 1970s, the firm did renovations on the Volendam (Deurvorst) and the Veendam (bureau). In the 1980s, De Vlaming designed interiors for sister ships Nieuw Amsterdam and Noordam. De Vlaming also lectured on the subject. Designing ship interiors was later taken over by Dingemans. In 1987, Salm retired from the firm. Today the firm is based in Utrecht under the name VFD Architects BV. (De Vlaming, Fennis & Dingemans).