Black artifacts in my renders I'm getting black artifacts in my renders. It looks like black pepper.

I've already re-calculated the normals (they were already facing in the right direction, anyway). You can see the artifacts on the door and the awning:



I'm using v2.68, but I get the same thing in v2.70.
The black artifacts are caused by intersecting meshes. In order to fix the issue, select the house model, enter edit mode and use W > "Remove doubles". Finally, go back to object mode and check if you have any duplicates of the objects in your scene, and delete them.