I assume it depends on the detail. Minimum frontage set backs require the home to start x feet from the street. Most people don’t want to lose a little space in the “pop front” so the rest of the home is extended back a couple feet. I have no idea how this all pencils out but it does cost something. Same with adding a turret or other ornamental details. If you know which blocks to look for, you can see homes get simpler and simpler until they are square brick blocks with flat roofs (like Riggs Park).