|Courtesy Google Maps Streetview|
After having done a couple of this kind of projects and making several changes in the course of the projects, you end up with quite some materials that you never used.
I am such a type of DIY guy. And sometimes I have indeed a lot of materials that I will not use anymore, or at the least the next months or years. Not a big investment usually, but anyway you don't need them and the materials take up space in your storage room, cabinet, shelves or wherever you put the materials.