Abacus is a high-caliber residential building contractor specializing in remodels and new construction. Each home is a unique reflection of the client’s tastes and lifestyle.

Our respect for planning, design, and collaboration is intrinsic to Abacus. We are passionately committed to fulfilling the creative vision of our clients, people for whom quality, integrity, and aesthetics matter deeply.

Founded by master builder Chas Voorhis in 1999, Abacus works throughout the Bay Area: San Francisco, Marin, the Peninsula, and Wine Country.