In 1989 Nico Steinmetz founded his architectural studio in the Rue Malakoff in Luxembourg, following the first contest he won with the help of his partner until 1994, Stefano Moreno: the conversion of a former factory in Hollerich which will become the Downtown complex, a Mecca of the city nightlife. This collaboration will give birth to several projects including the renovation of the residential buildings of Rue du Nord with its shops and the house Seiler in Heffingen, youth manifesto on the revival of rural housing.

In 1990 Arnaud De Meyer and Nico Steinmetz met at the Institut Supérieur d'Architecture St-Luc in Brussels, where the first enters as a student while the second begins to officiate as an assistant of professor John Cosse for the architecture workshop.

In 1995 Arnaud De Meyer joins the architecture studio Nico Steinmetz as associate architect. 
That same year, Nico Steinmetz will receive the first Luxembourg Award for Architecture for the house and studio in Malakoff.

The characteristics of the workshop’s projects are the scale and the connection to the site, the extensive study of the details and mastery of the materiality of the buildings. The urban component is particularly sensitive and reflections on the layout and structures of urban spaces from the start include reflections on architectural projects themselves.

Between 1997 and 2000, the studio is working on its first major project: the transformation and expansion of the Ancient Spa in Mondorf-les-Bains with an extension of the ballroom and the renovation of the Pavilion of the Source Kind with creation of all the entrance of the Thermal Park ; all will be completed in 2001.

With this experience, the collaboration of two architects will take an official turn with the establishment in 2001 of the association STEINMETZDEMEYER urban architects. The association will pose as a foundation to cultivate a non-specialization, that is to say a variety of projects of all types and at all scales, and also a fresh take on the projects by questioning and the analysis renewed with each new mission.

The duo starts but soon is to be talked about: 

This fledgling association has been given the makeover in a Kulturhaus of the historic house Thorn in Niederanven. The project has preserved the ancient building which has come to appoint a new space of glass, steel and native species (inaugurated in 2007).

Then, the workshop is rewarded the prize for architecture in the "Habitat" in 2004 for the realization of Weber's house, a detached house combining workplace and living place in a single site in Dippach. 

In 2007 the association was awarded the Luxembourg Award for Architecture, category workspace for the transformation of an old joiner’s workshop in an office building housing the 80 employees of InCA engineering. Alternating glass frames with wood siding modules gives a strong identity to the building located in an industrial area usually.

Winner of the contest organized by the City of Luxembourg in 2007, the association works now at the creation of a successor to the current Bierger-Center-Center Hamilius. The new building, Place Guillaume, will be complemented by exhibition spaces, reception and meeting facilities, accommodation of all categories and a new wedding hall.

In 2008, STDM steals the top spot in the architectural competition for the SES Business Center in Betzdorf. Currently under construction, the project will be launched in 2012.

As part of the international competition of the station device Cessange in 2009, STEINMETZDEMEYER in association with POHL won second place in conceiving an architectural complex as a continuation of the urban environment and landscape.

They were recently successful candidates to the competition for the new Luxexpo Kirchberg and Kirchberg Station under the aegis of the Fonds d’urbanisation du Kirchberg. Each project component will display its own identity as a benchmark throughout the neighborhood and all will interact to form an "urban landscape".

Very recently, STEINMETZDEMEYER won the contest of the City of Luxembourg "2010 Baulücken 2" which aims to provide urban housing at affordable prices without compromise on quality of living spaces and aesthetics. 

"Knowledge comes from experience, everything else is just information" said Einstein. 20-year career, the duo built step-by-step a solid foundation and look back on its accomplishments with satisfaction. That’s why they continue their pursuit of knowledge and experience with enthusiasm in projects they want always different, exciting and rewarding