We live in societies constantly changing at an ever-faster pace, while we plan and build our houses as if they were permanent environments without need for change. This consumes the planet's resources and a change in how we relate to our built environment is necessary for us to be able to stay within the planet's boundaries. New technology in combination with old knowledge can give us opportunities to produce buildings and environments that make better use of our resources and the site's conditions. This text examines theories and projects to find different strategies for how a more flexible, circular, and healthier architecture can be created and implemented in a project. Resulting in a proposal for a new building system designed for change. The use of digital tools, new financing models and production methods is proposed to give users a greater role in the design of their built environment. Thinking in systems, using local conditions, natural flows, introduce food production in an urban context, design for easy disassembly, using healthy and renewable materials, and user participation can help us become better at managing the planet's resources and create healthy environments for us to live in. A conclusion is that we need to become better at collaborating across different professional boundaries and develop both the architect's and the user's role in a project.