After graduating from the Faculty of Architecture at the Politecnico di Milano in 1987, Peia worked as the Assistant of Luca Meda, designing components and industrial products for office furniture.
From 1988 to 1997 he was a collaborator and partner of Ignazio Gardella with whom he designed, together with Fabio Nonis and Jacopo Gardella, iconic Italian designs such as the expansion of the Bocconi University campus and the Faculty of Architecture in Genoa. In 1998 he founded Peia & Associati and from 2001 to 2005 was a partner of Piero Lissoni in Lissoni Peia Associati. Peia went on to found Peia Associati with Marta Nasazzi in 2006.
Peia is know for his sustainable and ground breaking designs including the United Nations Hall in Geneva, the first room in the world with circadian light and with the highest levels of sustainability and audio and video technology.
He is a consultant and designer for a number of Italian companies producing components for furniture, bathroom, coatings, prefabricated construction systems and lighting including Cisal fittings, Martini Illuminazione, and the furniture brands Poliform, Colombo Stile and Marconi Furniture.