Is rainwater harvesting mandatory for your building in Karnataka?

Mandatory for sites of 1,200 sq ft (about 111 sq m) and above for new buildings; 2,400 sq ft (about 223 sq m) and above for existing buildings (Bengaluru). In Bengaluru, the BWSSB (Amendment) Act requires rainwater harvesting on existing buildings on sites of 2,400 sq ft (60x40 ft) or more and on new buildings on sites of 1,200 sq ft (30x40 ft) or more. New buildings don't get a water connection without proof of RWH. Homes without RWH pay a penalty of 25% of the monthly water bill for the first three months and 50% after that; non-residential buildings pay 50% and then 100%.

Most likely yes: rainwater harvesting is required for your building. Bangalore Water Supply and Sewerage (Amendment) Act, 2009/2011; penalty regulations 2015: sites of 1,200 sq ft (about 111 sq m) and above for new buildings; 2,400 sq ft (about 223 sq m) and above for existing buildings (Bengaluru). It applies from a plot area of 111 m² or more; your plot is 167 m².

Bengaluru: residential 25% of the water bill for the first 3 months, then 50%; non-residential 50%, then 100%. Water and sewer connections are withheld for new buildings.

Enter your plot area, roof area and number of floors in the checker on this page, in square feet, square yards (gaj) or square metres. It compares them with Karnataka's rule, Bangalore Water Supply and Sewerage (Amendment) Act, 2009/2011; penalty regulations 2015, and tells you whether it applies and why.