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William Hefner founded his architectural firm in Los Angeles in 1989. Over three decades, the practice has earned a reputation for its expertise in creating luxury custom residences, incorporating full interior and landscape design along with architecture. The firm offers mastery in the restoration of vintage structures as well as new construction in styles from classical to modern. The work is always grounded in architectural and design scholarship, emphasizing authenticity, refinement, and historically crafted detail while embracing 21st century comforts and innovations. In addition to private residences, Studio William Hefner works on a variety of projects including multi-family housing and mixed use commercial buildings, restaurants, and retail settings.

The firm is located in Los Angeles’ iconic Miracle Mile district. An open studio on two floors overlooks the Los Angeles County Museum of Art and other arts landmarks on Museum Row, providing a creative center and destination for clients. Housing a collaborative team of designers, the studio operates in a classical atelier mode that gives equal attention to each tier of the design process for all levels of architectural habitation.

The firm has a strong commitment to design excellence and believes that each project should have a unique architectural character that evolves from and draws upon the special circumstances surrounding its design. Its award-winning work is marked by a quest for timeless elegance, an appreciation of the craft of building, and the use of natural materials. In addition to its broad presence in California, Studio William Hefner has designed projects across the US and internationally.