Projects About Team Contact Previous Next Abacus is a high-caliber residential building contractor specializing in remodels and new construction. Each home is a unique reflection of our client’s tastes and lifestyle. Respect for planning, design, and collaboration is central 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. 415.927.0667 info@abacusbinc.com © Abacus Group Builders, Inc. CA General Contractor License #522340 P.O. Box 746 Corte Madera, CA 94976