The siting of a castle was never left to chance. Whether built at a tactical location controlling lines of communication, or to dominate a region as a display of power and authority, the building of a future castle was always the fruit of a strategic approach.
a strategic site
Guédelon is no exception to this rule. The site was chosen principally because of its close proximity to suitable construction materials. Transport was extremely costly in the Middle Ages: numerous taxes and tolls could double the value of the supplies.
On top of this, transporting goods - whether by road or by waterway - could considerably lengthen the construction time.