The application of new materials and technologies in the projects regarding the protection of cultural monuments is unavoidable and may render excellent results under the condition that a whole spectrum of experts are included, from art historians, curators and architects to producers and work performers. The paper is dealing with the general issues concerning the protection of cultural heritage with a special emphasis on the role of quality carpentry. Examined were cases of individual cultural heritage objects as well as undertakings in the protected city areas. High quality windows made of new materials are for a good reason no longer a taboo in this field: they are characterised by high quality thermal insulation, longevity, by being economical and easily maintained, and the design does not disturb the original style of historical buildings, thus significantly contributing to the preservation of the facility and its content.