Townhouses represent one of the most versatile and enduring urban housing typologies. From the Georgian houses of London to the brownstones of New York City, and their contemporary reinterpretations in cities such as Amsterdam and Barcelona, this townhouses model has consistently demonstrated its ability to adapt to diverse cultural and urban contexts.This book brings together projects from different countries and architects, illustrating how the townhouse continues to evolve without losing its essence: optimizing land use, supporting urban density, and strengthening the fabric of the city. By sharing party walls, it improves energy efficiency and maximizes spatial potential, allowing for the incorporation of courtyards, terraces, and double-height spaces that enhance spatial perception.Natural light plays a central role. Interior courtyards, skylights, and strategically placed voids transform narrow lots into bright, dynamic environments where the architectural section becomes a key design tool.At the same time, the renovation of older homes offers the opportunity to add height, reconfigure interiors, and introduce a new architectural language-- blending heritage with contempo