Hirante Welandawe qualified as an architect from the University of Moratuwa in 1980 and received her postgraduate training from the same University in 1983. She specialized in urban design at the Helsinki University of Technology.
She began her career in architecture as a trainee at Stein Doshi & Bhalla headed by Prof. B. V. Doshi. After working at several offices in Finland and Sri Lanka, she set up her own practice in partnership with Madhura Prematilleke.
Welandawe is a lecturer at the Colombo School of Architecture.