The Timurid era (771–912 AH / 1370–1506 CE) marks a critical phase in the transformation of Iranian bookbinding. While influenced by regional dynasties such as the Jalayirids, Muzaffarids, Qara Qoyunlu and Aq Qoyunlu Turkmens, as well as the Mamluks of Egypt and artistic traditions of the Far East, Timurid bindings developed an independent technical and aesthetic identity, reaching their peak of refinement in the second half of the ninth century AH. Alongside decorative innovations, particular attention was given to the functional and protective aspects of bindings. One of the most significant achievements of this period was the introduction of the envelope flap covers (head flap), which functioned not only as a structural element but also as an important ornamental component. Initially, Envelope flap covers decoration was limited to simple geometric motifs, reflecting the restrained aesthetic of early bindings. With the advancement of leather decoration techniques during the Timurid era, Envelope flap covers gradually acquired more elaborate and refined ornamentation. This study seeks to identify and systematize the construction techniques of Timurid Envelope flap covers -bindings. Adopting a descriptive–analytical approach, more than one hundred examples preserved in collections worldwide were examined, from which twenty representative bindings were selected based on diversity of construction methods and decorative patterns. The results indicate that stamped decoration (Zarbī) was the most frequently employed technique, followed by mosaic (Moʿarraq) and carved (Monabbat) techniques, which were predominantly used in the doublures.