Mia Sandmark Design is a firm based in Sonoma, California. Serving Sonoma, Lake Tahoe, Napa, Marin, and the greater Bay Area, we specialize in architectural planning, residential remodels, new construction interiors, furnishings, and boutique hospitality design. Our work blends Scandinavian principles with a distinctly Californian sensibility, combining texture, soul, and thoughtful restraint to create timeless interiors that feel both elevated and deeply personal. Every space is rooted in its natural surroundings and shaped by the rhythm of daily life, resulting in environments that are as functional as they are beautiful.

We practice what we call hospitality-minded design, an approach grounded in warmth, connection, and ease. Whether designing a private residence or a public-facing space, our focus is on creating interiors that invite people in and make room for memories. We believe every space should support gathering, spark conversation, and offer comfort, whether for everyday rituals or meaningful celebrations. Guided by a refined process and a philosophy shaped by Scandinavian heritage and practicality, our work always includes an element of surprise, something unexpected that adds character and delight. Through custom furnishings, curated materials, and artistic depth, we create spaces that feel soulful, intentional, and built to last.