About Us

frenchCALIFORNIA is a New York– and California–based design studio creating timeless, globally inspired interiors.

Our Philosophy

ELEVATED DESIGN & AESTHETICS

Founded by Paris-born designer Guillaume Coutheillas, the studio specializes in luxury residential design, including turnkey renovations, interior furnishings, art curation, and model residence staging, while also taking on select commercial and exhibition projects.


A GLOBAL APPROACH

Over the past decade, frenchCALIFORNIA has contributed design expertise to projects developed in collaboration with internationally acclaimed architecture firms such as Sir David Adjaye, Robert A.M. Stern Architects, Rogers Stirk Harbour + Partners, Richard Meier & Partners, and Foster + Partners.

What We Offer

  • We believe in creating beautiful homes that capture your style. With a strong attention to detail, our Architectural-Digest-approved team will create a space that feels like home.

  • We work with builders, brokers, and homeowners and know how important it is to sell a home. Our award-winning team will make sure your space is more than just a property. We will make it a destination.

  • Turnkey service from purchasing to installation. Working with artists and gallery owners across the world, we find unique pieces that bring your space to the next level.

  • We support you by providing the research necessary to shorten time on the market and ask a competitive price.

  • Looking to create a brand for your condominium, multifamily property or hospitality project? Our creative team specializes in bringing your ideas to life through branding and activation.

  • Our creative team works with brands to find their identity and design pieces that highlight their individuality and uniqueness.

ABOUT THE FOUNDER

Guillaume Coutheillas is a Paris-born interior designer and branding expert and the Founder of frenchCALIFORNIA, a globally minded interior design and branding studio creating unmatched commercial and residential interiors. 

Alongside its design practice, frenchCALIFORNIA curates a collection of antiques, vintage pieces, and contemporary works — a reflection of the studio’s shared love for timeless design, soulful materials, and lived-in beauty.

Guillaume is actively involved in the design community, supporting institutions like the San Francisco Museum of Modern Art and the de Young Museum, and participating as a member of the Urban Land Institute, Interior Design Society, and Designer Society of America.

 AWARDS & RECOGNITION

The firm’s work has been featured in Architectural Digest, Interior Design Magazine, Robb Report, Galerie, and more, and has been recognized by leading award committees, including the Interior Design Society of America (360 Design Excellence Award), NYCxDESIGN Awards, and The Architect’s Newspaper Interiors Award.

Our Team

Matthew
Vice President

Bernadette
Content Manager

Catherine
Senior Designer

Leo
Designer

Patricia
Marketing + Analytics

Chelsea
Designer

Jasmine
Interior Designer

Kay
Senior Project Manager

Georgie
Project Manager

Charlie
Copywriter

Bruna
Interior Designer

Jake
Architect / Designer

Serena
Brand Assistant

Olivia
Interior Designer

Charlotte + Axel
Senior Designer & Illustrator

Stephanie
Marketing + Strategy

Sam
Interior Designer

Bobby
Interior Designer