The Ghaziabad Development Authority has mandated rooftop solar power systems and rainwater harvesting structures in all new residential building plans, making these provisions a compulsory part of submissions. The regulation is presented as a municipal response to the twin pressures of growing electricity demand and stressed water resources in this rapidly expanding city in the National Capital Region. By embedding the requirements into approval processes the authority aims to ensure that sustainability measures are considered at the earliest stages of design. Making rooftop solar compulsory aims to encourage decentralised clean energy generation at household level and to reduce reliance on centralised power supplies, supporting grid stability and lowering peak load pressures. The directive emphasises that integrating photovoltaic systems during construction is generally more efficient and cost effective than retrofitting after completion and that households and developers can capture long term financial benefits through reduced electricity bills. The policy is expected to prompt builders to plan for system layouts and to work with suppliers earlier in the development cycle. The mandate for rainwater harvesting seeks to improve on site water management while contributing to groundwater recharge through rooftop capture, storage and managed infiltration. The requirement envisages storage tanks and underground recharge pits or similar arrangements to channel runoff into aquifers and to reduce surface accumulation that can cause waterlogging in monsoon rains. Municipal planners consider such decentralised interventions to be useful complements to larger infrastructure investments given persistent stress on groundwater resources. For developers, architects and prospective homeowners the rule will require adjustments to design priorities, cost estimates and construction sequencing to accommodate energy and water conservation infrastructure. The measure aligns with a wider trend among urban bodies to integrate sustainability into building bylaws and to promote more self sufficient and resilient housing stock rather than treating green features as optional extras. The authority foresees that the combined measures will enhance environmental resilience, deliver operational savings and offer a replicable model for other cities pursuing sustainable growth.