Rainwater harvesting kits for homes

Cities like Bengaluru, Karachi and Chennai face severe water shortages, yet monsoon rain runs straight into the drains. Most homeowners don't know how to collect it, and contractors charge a lot for custom systems.

A ready-made rainwater harvesting kit for houses and small apartment blocks: gutter filters, a first-flush diverter, a storage tank or groundwater-recharge pit, with installation by trained local plumbers. A simple app shows litres saved.

Revenue: kit sales with installation, around $150–$400 depending on roof size; maintenance plans before each monsoon.

Looking for a salesperson who can work with housing societies and builders, and a water-engineering expert to design the kits.

This is a starter idea from the UnbuiltHub team. Nobody owns it: if you'd like to build it, share your own version and find your team here.