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Castor Architecture


About Us

Castor Architecture is based in Mill Valley, CA with projects from Marin County to the Wine Country, San Francisco and the Peninsula. We choose to maintain a small team so that we can focus on doing a few things at a time, and doing them well. We specialize in single family residences, from estates and new construction to additions and renovations. Because the home exemplifies what called us to architecture in the first place – not only that we can achieve beauty, but that we can also make room for living.

Services Provided

Architectural Design, Bathroom Design, Building Design, Custom Homes, Home Additions, Home Remodeling, Kitchen Design

Areas Served

Alto, Belvedere, Belvedere Tiburon, Bolinas, Corte Madera, Fairfax, Forest Knolls, Greenbrae, Lagunitas, Lagunitas-Forest Knolls, Larkspur, Lucas Valley-Marinwood, Marin City, Mill Valley, Muir Beach, North Richmond, Richmond, Ross, San Anselmo, San Francisco, San Geronimo, San Quentin, San Rafael, Santa Venetia, Sausalito, Sleepy Hollow, Stinson Beach, Tamalpais-Homestead Valley, Tiburon, Woodacre

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10 Projects

Sonoma, CA

Formal Farmhouse | Sonoma, CA

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3 Ideabooks

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Contact Castor Architecture
Contact for Appointment
Mill Valley, CA 94941
Typical Job Cost $250,000 - 10 million
License Number C-31089