Who are we ?



MUST sprl, a company founded in 1987 specialising in the design, fitting-out and equipment of professional and private spaces.

Mr Cluentius Thierry, Managing Director of Must Sprl., ENSAAV diploma holder - Ecole Nationale Supérieure d’Architecture et des Arts Visuels (La Cambre) - began his career in :

1975: Head of the Research and Design Department of ELSMOORTEL & LORAL, Antwerp.

1979: Head of the Interior Architecture Department of SATRIMA S.A., Malines.

1983: Founded BUREAU D’ETUDES CLUENTIUS SPRL, specialising in professional, commercial and private design projects in Belgium and abroad: France, Holland, USA and Luxembourg.

1987: Creation of the company MUST SPRL and exclusive importer of USM furniture systems.

1990: Commercial development of a network of resellers.

2010: Creation of an e-commerce site: “Must-online.be”.


35 years experience in interior design

Must Sprl. is an importer of USM Haller, USM Kitos, USM Display and USM interior design systems and reseller of several other brands such as Vitra (chairs) and Belux (lights).

Our range of furniture forms part of our quest for timeless quality products. The search for solutions is always conducted within an economic perspective coupled with ecological considerations.

The USM system generates a wide variety of possibilities and therefore calls for skill and professionalism in advice, planning and installation.

Our team is at your service to meet any requests and advise you on layout and equipment in the public sector, businesses and the home.

Our concern is to meet your wishes as best we can through a personalised composition.

Assembly and installation are therefore carried out according to best professional practice by well-trained specialist assemblers.

Must Sprl. has participated in several Designer Weekends in Brussels, sponsored A Dagen (Breda and Maastricht) and taken part in the Cocoon trade fairs in Brussels and the Sfeer fairs in Ghent.


Our showroom is open from Tuesday to Friday, by appointment only.

Tel. +32 (0)2 347.03.18 or e-mail: usm.must@skynet.be

Address: Avenue Massenet 6, 1190 Brussels.