Together with his partner Ola Broms Wessel, he runs the architectural practice Spridd. Spridd’s vision is that of ‘green social architecture’, which takes account of social relationships and human behaviour. Spridd believes that a resource-efficient approach to building entails evaluating what is really needed and seeking new approaches to sharing spaces, avoiding unnecessary construction, reusing where possible, and, when new construction is needed, planning thoroughly and economically to strengthen social relations. Klas also serves on the board of Mobile Art Production (MAP).