This document provides details about the design and construction of The British School in New Delhi, India. The project involved expanding the existing school from 650 to 1,300 students while construction was ongoing. This was achieved by first building a perimeter block on unused land, then renovating the vacated existing school. Sustainable design strategies like passive cooling, maximum daylighting, and renewable energy systems were used to reduce energy consumption by 73% compared to benchmarks. The $19.6 million project received a 5-star GRIHA rating for its environmentally friendly design.