For centuries, the indigenous architecture of Himachal Pradesh has evolved in harmony with its mountains, climate, and communities. Built from stone and timber using sophisticated earthquake-resistant construction techniques, the Kath-kunni tradition represents one of the most remarkable and enduring vernacular building systems of the western Himalayas. Yet despite its architectural, technological, and cultural significance, much of this heritage has remained little documented. Drawing on more than two decades of field research, this illustrated volume offers a comprehensive study of Kath-Kunni architecture across the districts of Shimla, Mandi, Kullu, Lahaul and Spiti, and Kinnaur. Through typological analyses, architectural photography, and historical research, it explores the evolution of this unique building tradition, the master craftsmen who shaped it, and the communities whose knowledge has sustained it for generations. As many of these remarkable structures face increasing pressure from changing patterns of development, this publication is both an essential contribution to the documentation of Himachal Pradesh's architectural heritage and a timely call for its recognition, conservation, and continued relevance.