The First Siza is a documentary about the Four Houses, the first project by Álvaro Siza, designed while he was still a student, and the impact of architecture on people's lives. Through the reunion, 60 years later, between the architect and Fernando Neto — his first client and owner of one of the houses in Matosinhos — the film reveals how this project was pivotal in Siza’s career. Featuring interviews with Siza, the residents, and critic Francesco Dal Co, as well as current and archival footage, the narrative explores how architecture and the lives of its inhabitants become intertwined over time.