This is a renovation project. The owner is a professional woman and looks after her daughter independently. Time and space are important to improve life efficiency. Before transformation, low space utilization rate, only 55%. Limited space for her daughter to grow up and space for her hobbies. After transformation, space utilization rate increases, by reorganizing functions distribution, extending living space, designing hobbies area, and using the vacant space to be a guest room in a composite way. We exchange space for life time, improve life quality and take all-round needs into account .