Turnbull Griffin Haesloop Architects (TGH)

Mid-Century Gems Official
May 3
2 min read

Updated: May 4

Turnbull Griffin Haesloop Architects (TGH) is a Berkeley-based architecture firm known for creating serene, sustainable homes that are deeply attuned to the land they inhabit. Founded in 1997 by Eric Haesloop and Mary Griffin, the studio was established to carry forward the ethos of the late William Turnbull Jr., a pioneering figure of California modernism and one of the original architects behind the iconic Sea Ranch community. His philosophy—that architecture should be grounded in place and shaped by the natural world—remains central to TGH’s work.

Rooted in the Bay Area’s tradition of regional modernism, TGH designs are quiet, clear, and contemplative. The studio specializes in custom homes across Northern California—from coastal retreats to hillside sanctuaries—each one reflecting a deep sensitivity to its site and a thoughtful dialogue between building and landscape. TGH’s process begins with listening: to the topography, microclimate, and vegetation of each location, as well as to the needs and aspirations of every client.

Indoor-outdoor relationships are often the genesis of their designs, with careful attention paid to light, material, and craftsmanship. Sustainability is not an afterthought, but a foundation—guiding everything from passive solar orientation to the use of locally appropriate, environmentally responsible materials. The result is a portfolio of architecture that feels rooted, restorative, and enduring—spaces that not only respect their context, but elevate the experience of living within it.

Design Philosophy

TGH's architecture is deeply inspired by the unique characteristics of each site and client. The firm emphasizes establishing a 'sense of place,' carefully considering factors such as topography, microclimate, solar orientation, vegetation, water resources, and fire resilience in their designs . Green building principles guide their material choices, ensuring that structures complement and celebrate their natural settings.

Notable Projects

TGH has an extensive portfolio of residential projects across Northern California, including the Sea Ranch, Napa, Sonoma, and Carmel Valley . Some of their acclaimed works include:

Hupomone Ranch: A sustainable family retreat in Petaluma that blends modern design with agricultural heritage.
Sonoma Residence: A net-zero home designed for seamless indoor-outdoor living, featuring a living roof that integrates the house with its landscape.
Cloverdale Residence: A hillside home that captures panoramic views while maintaining a low environmental impact.
Mill Valley Guesthouse: A compact, modern guesthouse that maximizes space and light, nestled within a wooded site.

These projects exemplify TGH's dedication to creating homes that are both aesthetically pleasing and environmentally responsible.

Recognition

TGH's work has been widely published and recognized in various architectural publications, including Dwell, The New York Times, and Residential Architect . The firm has also been acknowledged by Forbes as one of America's top 200 residential architects

Turnbull Griffin Haesloop Architects stands out for its thoughtful integration of architecture with the natural environment. By prioritizing sustainability and a deep understanding of place, TGH continues to produce enduring designs that resonate with the landscapes they inhabit.