House-owners and real-estate developers ought to make provision for installing roof-top solar panels, rain-water harvesting system and garbage-disposal mechanism in multi-storey flats. Municipal authorities should fix norms and make them mandatory. Architects and related experts could come out with a catalogue of designs and models to suit varied structures.

Such built-in facilities would make dwellings more resident-friendsly; conserve power and waters; and prove to be cost-effective in the long-run.