Jose María De La Lapuerta, Fernando Altozano Collection of technical details of a selection of high-density social housing, all located in Madrid, with special attention to the resolution of the holes or windows and their envelope. A technical catalog of different collective housing solutions promoted by the Municipal Housing Company in Madrid in recent years, on high-density social housing. In it, the house is analyzed from its construction system, especially focused on the types of enclosure and hole in which technical, design, social repercussions, energy savings and costs are contemplated. This book has been made on the results, redrawing, completing, uniforming and correcting, or re-photographing all these buildings.