The speed and scale of growth anticipated in the next few decades will mean that managing urban areas, and planning for new sustainable urban extensions, will be one of the most important challenges facing cities and societies in the 21st century. The Rapid Planning Toolkit is a simple and practical 4-step tool which intends to assist city leaders and built environment professionals in creating robust and implementable walkable neighbourhood plans in rapidly growing cities or towns. The Toolkit advocates that built environment professionals collaborate with local and national governments, technical specialists and local communities to create effective city planning.