The tuition renders a complex survey about plastics produce at home and abroad, briefly discusses the production of these materials and especially the properties and the utilization in building work. The stress is laid to new plastics with maximal length of life. Among others cellulose, polyethylene, polypropylene, polyesters, polytetrafluorethylen - teflon, products of PVC, polyamide, polystyrene will be discussed and epoxy resins, polyesters, polyurethane, modern acrylic polymers, polyacrilate and silicones as well. The subject makes the student acquainted with the possibility of plastics added into cement mortars and concrete, but the main stress is laid to the rehabilitation of building structures, which is a t the time being a very actual problem in building industry.