Right next to the church you can find a small school set up for the workers kids to educate them and to teach them. In that time educate was a rare and expensive good. By teaching the workers kids, they offered them a career as a worker on the building site. While teaching them the basic math and tool handling they were able to get skilled and qualified workers. On the other hand, the kids got an opportunity get a job and to make their living. Keep in mind, other big cathedrals were constructed and build for at least decades. The construction of the cathedral in Cologne, for example, lasted more than 600 years! Thus, several generations of people were supposed to make their living on working on this cathedral. And, even after finishing such a building, some stonecutters will stay with the cathedral works to renew and repairs several parts every now and than.