Our neighbors did that too. Grass lot with a small garden, paved over all the way to the house for a parking pad and tacky patio area.

Zoning requires a specific amount of permeable surface, 20% of the lot in my zone, and their lot was over 95% impermeable. I put in a complaint with then-DCRA, they took four months to inspect, and found no violation. Nothing we can do except absorb their water.