According to the IPCC and the science community in general, there is an urgent need to decarbonize the built environment in order to keep alive the possibility of achieving the goals of the Paris Agreement. Since 2015 when the targets were set, there have been different approaches and studies that show how decarbonization can be achieved, and many solutions exist nowadays to convert an existing building to net-zero and to design a new building as net-zero from the beginning. In the case of existing residential buildings, homes, the biggest problems still without solutions as of 2022, are related to accelerating the renovation rates, the depth of the renovations and solving how to incentivise the investment on retrofitting.