Established originally by Architect Rajinder Kumar in 1970s and spearheaded jointly by him and his son Architect Rahul Kumar since the mid-1990s, RKA (Rajinder Kumar Associates) is regarded as one of the leading architecture, planning and interior design firms in India. Rajinder Kumar & Rahul Kumar are well known for their simplicity, their aesthetic sensibility and their inspirational designs. Their designs are distinctive, cost-effective, green and energy-efficient, continually promoting simplicity and indigenous quality in all their buildings. Together they have played a key role in the creation of contemporary architecture across the length and breadth of India. In a candid interview with Window and Façade magazine, Ar. Rahul Kumar talks about his firm Rajinder Kumar Associates (RKA), outlines their design principles, elaborates on a few of their projects and explains the factors to consider while designing façades for any project.