The modular design of LUMENHAUS allows it to grow with your family. Multiple units can connect or stack with plug-in stairs and entryways to create two-, three-, and four-bedroom houses with the same efficient use of space of the single module. If used as a part of a community, the houses have the potential to become even more sustainable than the single house. For example, if a single person were to originally move into a single module, but then later got married, he or she could add another module to expand the space with little difficulty. As the family expands with the births of children, more modules could be added to increase living space. However, once the children reach adulthood and move out, all that extra space could be moved down the street to a new, budding family’s house to be used again.