The Federal Industrialised Building and Off-Site Manufactured Houses Quality Assurance Association (Bundes-Gütegemeinschaft Montagebau und Fertighäuser e.V. – BMF) was founded in 1961, in Hamburg, with the objective of ensuring the quality of the products and processes of its member companies and to set new standards in the off-site construction sector. It is a quality assurance association recognised by RAL Deutsches Institut für Gütesicherung und Kennzeichnung e.V. The quality assurance association is now based in Bad Honnef near Bonn and has around 130 members, primarily from Germany, but also from neighbouring countries.
The RAL quality marks are awarded to its members by the quality assurance association. These are continuously monitored on the basis of the respective RAL Quality and Test Specifications. The BMF currently holds and issues the RAL quality marks for “Timber house construction” (RAL GZ 422), “Raw timber element production” (RAL GZ 421), “Steel system construction” (RAL GZ 613) and “Portable space systems” (RAL GZ 619).