The need for affordable housing requires more compact living. With the increasing frequency and impact of climate change incidents, a new way of thinking is needed to live in a more resilient and climate responsive way. The idea of a Z free home began by considering these two needs. As a tiny mobile house equipped with passive and eco-cycle systems, it achieves 9 zero targets. This paper evaluates the design concept, building modelling, and building simulation for the Z free home design. The project is ongoing and aims to model a full physical prototype as a proof of concept for the 9 zero targets in an urban living lab context in Lund Sweden.