Consumer and industry show an increasing interest in biopolymers, but their application at the moment is still mostly limited to the packaging industry. According to their narrow area of application biopolymers have to be modified with functional additives and thus adapted to achieve other properties. The previously best known and most available biopolymer is Polylactic acid (PLA). PLA has good mechanical properties on the level of commodity plastics like Polypropylene (PP) or Polyethylentherethalat (PET). However the use of PLA in technical applications is limited due to its relatively low heat resistance (HDT) of 55 °C and its low ductility and elongation at break properties. Depending on the foreseen field of application special modifications are necessary to adjust the PLA material individually to the required properties and process requirements. An interesting new area of application for biopolymers is the construction and building sector. In this area new sustainable materials are interesting for the manufacturing of structural components like windows profiles or plate geometries. In this paper two promising ways to improve the material characteristics of virgin PLA for technical applications, e. g. profile extrusion, are presented. In the first case PLA is combined with other biopolymers to create new biobased blend systems. The second way is to establish effective crystallization conditions for PLA by adding functional fillers (nucleating agents) and set-up ideal specific material process conditions. To verify the improved properties of the new materials several mechanical (tensile test, Charpy impact test), thermal (heat deflection temperature) and rheological (high capillary viscometry) tests have been performed. Furthermore a case study shows that the developed PLA materials are suitable to be processed on standard profile extrusion equipment to produce high quality window profiles.