Friday: Measure and mark the driveway and remove the old paving (Steps 1-5). Saturday: Prepare the bed, lay the bblestones, and grout (Steps 6–18). How to Build a bblestone Driveway Apron 1. Measure the Driveway Photo by Kolin Smith. A typical driveway apron extends 10 feet up from the street—in many places, smack in the public right-of