At least many areas have monotony laws in their building codes. The development where I bought my previous house from had accidentally sold two of the same hou

At least many areas have monotony laws in their building codes. The development where I bought my previous house from had accidentally sold two of the same house styles next to each other, so they ended up giving one of the buyers a free elevation upgrade (they had 4 models (floorplans), and 4 trim levels ("elevations") in each floor plan which was basically a simple roof, or adding [fake] dormers or other roof peaks features, and vinyl siding vs partial brick vs stone facing, etc). Add in different siding or brick colors and you could have a large variety with a minimal set of basic house plans.