The art of stained glass is an art with a long history. In the beginning, stained glass was used only by the church, but the admiration and the awe it caused, made it very popular in private and public buildings. In this study two stained glasses from private houses are analyzed. Except its long history, other characteristics of stained glass are the complexity of its construction, the variety of materials involved and the skills needed for its manufacture. For all these reasons it was essential that the study should start with a section about the history of stained glass, followed by a reference to the two main structural materials : glass and lead. The third section refers to the techniques of stained glass construction, the materials and tools required. In the next chapter damage procedures and corrosion of the materials are being analyzed as well as ways of treatment. Some of these forms of corrosion are located in the two stained glasses. Finally chapters 5 and 6 refer to the work of conservation of these two objects. Due to the different problems these objects encounter, they are considered as two different case studies. The first stained glass has structural problems with lead alteration, loss of glass and external impurities. The second stained glass has glass paint, partly deteriorated, as well as breakages causing further damage. For the conservation of the objects the appropriate conservation and restoration methods were chosen. These include analysis of materials, cleaning, repairing of the lead matrix, mending breaks, consolidation of fragile paint and recreation of missing details.