The guide "Old Houses. Converting, Renovating, Expanding" offers a comprehensive collection of 30 exemplary projects distinguished by high architectural and design quality. It is aimed at anyone involved in the repurposing and renovation of existing buildings, whether single-family homes, settlement houses, or barns. The featured projects come from German-speaking regions and showcase innovative approaches to preserving and adapting existing structures. By renovating and expanding old buildings, builders can not only save costs and time but also make a valuable contribution to environmental protection by reducing CO2 emissions and construction waste. The guide includes 220 color images and 60 floor plans that provide inspiring ideas and practical solutions.