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Personal, authentic design solutions for the qualities of life that matter.
Castor Architecture: Make yourself at home

Castor Architecture is based in Mill Valley, California, with projects from Marin County and the Wine Country to San Francisco and the Peninsula, Southern California and beyond.  For the past 20 years we have specialized in custom, single-family residential design, ranging from the construction of new homes on open land to the renovation of existing structures in urban settings.  More recently, our body of work has grown to include mixed-use, multi-family, affordable, and manufactured/modular housing.

We are happiest when presented with challenging assignments.  Difficult parameters encourage responses that are authentic rather than generic, personal rather than “perfect”.  Instead of employing a signature style, we relish the freedom to create unique connections to specific places.  The styles may vary, but our guiding motivations remain the same.  Inch-perfect space planning, intuitive command of scale and proportion, and mastery of sculptural composition – these are the hallmarks of our work.

Our clients never cease to surprise and inspire us with their outlandish ideas, pet obsessions, and brilliant solutions.  Collaborating with landscape architects, interior designers and other consultants keeps the work fresh.  Our trusted contractors, vendors and fabricators bring their expertise to the construction team.  Years of experience guiding clients through some of the Bay Area’s most challenging jurisdictions have provided crucial knowledge about our role as advocates in the entitlement process.

As devoted as we are to the needs of our clients, we also appreciate the fact that the homes we design and build have an impact on the communities around them.  Maintaining and improving the quality of the built environment remains the collective duty of all architects.  And rather than limiting our work as designers, this common heritage serves as our greatest source of inspiration.  Like our logo, the history of architecture is like a beautiful cage with an open door.  We are free to come and go as we please.