M20 Extension of a Charterhouse is a minimalist residence located in Toulouse, France, designed by BAST. The clients purchased a small plot towards the back of their home, and wanted to extend their ground floor. The project consists of expanding their living room into this new lot. The brick wall extends along the length while sliding glass doors provide access. This new room adopts several functions, mainly as a living room, kitchen, and winter garden, but also as a terrace during warm days.