Luxury buyers in Delhi-NCR increasingly prefer sustainable, IGBC/GRIHA-rated homes with solar, rainwater harvesting, greywater reuse, high IAQ, and ECBC-aligned envelopes. For Gurugram/Noida/Delhi, these features improve operating costs, health, and resale liquidity; regulators now mandate RWH/solar/energy norms in many cases, while Delhi’s Solar Policy 2023 and a July 2025 subsidy update accelerate rooftop adoption. Expect marginal…