About frenchCALIFORNIA
frenchCALIFORNIA is an interior design studio creating spaces that blend European refinement with California ease — what we call quiet opulence.
We design luxury homes, turnkey renovations, and model residences, as well as select hospitality, exhibition, and brand projects. Our work is rooted in storytelling — balancing architecture, art, and atmosphere to create spaces that feel personal, soulful, and timeless.
Based in New York, with projects across California, the Hamptons, and Nashville, we collaborate with homeowners, developers, and brands to shape interiors that are both sophisticated and deeply livable. Our work has been featured in Architectural Digest, Elle Decor, SF Magazine, California Home + Design, and more.
About Guillaume
Guillaume Coutheillas is a Paris-born, New York and San Francisco–based interior designer and the Founder and Creative Director of frenchCALIFORNIA. His background spans design, art, and branding — a combination that defines the studio’s globally i
