Environmental masterplanning is an increasingly vibrant area of research and development activity. Design tools to support environmental masterplanning can be loosely categorised as simulating (i) microclimate, (ii) resource availability, and (iii) resource flows. Much progress has been made in respect of (i) and (ii) but the latter category – simulating resource flows within the urban neighbourhood – is at an embryonic stage. There is also a dearth of guidance for designing and managing sustainable urban neighbourhoods. This paper describes a new EC funded research project that was conceived to fill this important niche: Project SUNtool.