Costantini Design

Costantini Design is an interior design studio, gallery, workshop, and design house in New York City. Founded in 2002 by William C. Stuart, it creates made-to-order furniture, unique works, limited editions, lighting, and bespoke commissions. The atelier connects designers, engineers, and artisans throughout each project, working with materials such as bronze, wood, stone, leather, parchment, steel, and glass. Clients can select from existing collections or develop original pieces, tailoring dimensions, finishes, and materials for private residences, hospitality projects, and commercial interiors. Costantini also represents contemporary artists and designers, including Studio Mirei, Studio Kër, and Studio Armin. Its work is produced in New York and Buenos Aires, with clients including collectors, designers, and architects worldwide.