There could be protection put up around the place where they were building Hogwarts, just like protection around the woods of the Quidditch World Cup - which if Muggles come near the place they remember some appointments and turn away (Arthur Weasely says in book 4). They work for months to make these protections.
But the founders of Hogwarts were much more powerful than any wizard, for they have built a school for magic. They could easily have first created protection then build the castle.
This can also be seen, though it's small, how the trio (Harry, Ron and Hermione) protect their hiding place in Deathly Hallows - first create protection around the place, then erect the tent.
For materials they could have bought it, or just used emino curse over one block to repeat them.
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