In 2013 we drew up a plan for Zandzoom Limmen, a new residential district between the existing ribbon strips in the village of Limmen. Inspired by this plan, the Heiloo local authority invited us to draw up a plan for the agrarian area between Heiloo and Limmen, the Heiloo Zandzoom. The local authority has based the idea of this residential landscape on the concept of organic urban design, which means that the tempo of development depends on market demand. This calls for a flexible spatial framework to safeguard the spatial quality while leaving sufficient scope for investors to develop initiatives. To ensure that the separate plans to be developed for subsidiary projects have sufficient quality and coherence, an urban development plan is required that forms a bridge between the current directive plans and the specific filling in of the subsidiary areas. This urban development plan must be flexible enough to accommodate changes in the future, bearing in mind that Heiloo Zandzoom will probably be developed over a long period of several decades.