This paper presents an approach for the production of the solar bonding box (SBB).This is the optimum volume conditioned by both the urban rules of form and solar envelope rules. The urban rules are defined by the urban zoning regulations of a city. The solar envelope defines the largest volume that doesn't cast its shadows on neighboring buildings during critical periods of sunshine. The object here is the digitally assisted construction of the volume that satisfies these two constraints on a given urban area. The purpose is to design buildings respecting the solar rights.