Since 2010 the Werner & Mertz office building has been a prominent landmark in Rheinallee in Mainz. The headquarters, crowned by striking wind turbine rotors on the roof, meets the highest international standards for sustainable and environmentally friendly construction. In recognition of this achievement, Werner & Mertz was awarded the LEED Platinum, the most demanding sustainability certification for buildings, in 2012. The office building is the only industrial headquarters in Germany in the highest LEED award class. LEED is a classification system for top-quality ecological buildings.

The building's unique energy concept is particularly impressive. By means of wind power, photovoltaic cells and geothermal groundwater usage, the new building creates 20 percent more energy than required for its current operation. Furthermore, solar panels on the building's roof supply power to two electric Smarts of the company's car fleet.

The company's own water well supplies the heating/cooling system. From there the water flows into the new deionization plant on our production site and then into production for a resource-friendly second use.

The LEED certification system was developed in the USA by the non-profit organization U.S. Green Building Council (USGBC). The five environmental categories in a building’s rating system are sustainable site, water efficiency, energy and atmosphere, materials and resources and indoor environmental quality, along with a sixth category called "innovation in design". The assessment is based on a fixed rating scale where platinum is the highest of four quality levels.