The company has made some major creations in the cathedrals of Beauvais, Senlis, Noyon, Chapelle de la Citadelle in Sisteron, the Saint-Gervais- Saint Protais church in Paris, the Saint-Etienne church in Beauvais, etc. The company is also specialised in restoring old stained glass, and is capable of working on miniatures, such as in the Cabinet des Curiosités of the Hotel Salomon de Rothschild in Paris, as well as on large-scale projects like the West Rose Window in the Amiens Cathedral. Other prestigious venues have undergone important restoration work, such as the library of Troyes , the Châlons-en-Champagne cathedral and the Saint-Denis Basilica. Thanks to many years of research, the company has developed the techniques it uses for restoration as well as creation. For example, it rediscovered the bases for 16th century paints and colours and the composition and cooking method of French and Swiss transparent enamels. It has also developed other techniques that have been approved by the Historical Monuments organisation, notably micro-lead to rebuild broken parts. The advantages of this technique are its reversibility and its durability, unlike glue. Another advantage is to be able to easily insert new complementary parts into old parts, safe in the knowledge that they can be removed just as easily. Another technique, called L.D.G, is used to restore grisailles that have been erased by time and weather conditions. Interior architecture is another field in which Ateliers Courageux works, with stained glass being just as easy to integrate nowadays as a painting thanks to a process which they have patented. With this lighting system, stained-glass paintings can be displayed in an ultra-flat frame with perfectly even light distribution, regardless of its size. These productions can be fitted into a contemporary environment and could also be used on a far larger scale in today's architecture.