MARCUS & WILLERS ARCHITECTS

Follow Us

MARCUS & WILLERS © 2024 All Rights Reserved

Custom Homes, ADUs & Thoughtful Remodels

For more than 35 years, Marcus & Willers Architects has designed homes that belong to the Sonoma Valley. Founded in Sonoma in 1990 by Carol Marcus and Bill Willers — both University of California, Berkeley–trained architects — our residential practice rests on a simple idea: the right house grows out of its site, its climate, and the lives of our clients, and their friends who will enjoy their time there. Our designs are client-centered, site-sensitive design, and this has guided every project, from a single quiet bedroom to entire neighborhoods.

What We Design

We focus on residential architecture across Sonoma and Napa: custom home design, accessory dwelling units (ADUs), additions and whole-house remodels, and the careful rehabilitation of historic residences. We also bring decades of municipal and planning experience — design review, zoning, and code strategy — that helps projects move through Sonoma's complex permitting landscape with fewer surprises. Whether you're reimagining a 1950s ranch on five acres or building from raw ground, we translate your goals into spaces that feel inevitable.

A good building is a conversation.

We work closely with clients, contractors, and building officials — relationships we've cultivated for over three decades — because the best results come from a team that trusts one another. Sustainability is part of that conversation too; as Certified Green Building Professionals, we design for comfort, efficiency, and the long life of a home.

Where We Work

We serve homeowners throughout the North Bay, including Sonoma, Glen Ellen, Kenwood, Napa, Healdsburg, and Petaluma, across the greater Sonoma and Napa Valleys, Marin, and the wider San Francisco Bay Area.our

Recognition

Our Olive Hill residence was featured in Sunset Magazine's 2026 Wellness issue — a reflection of the calm, site-rooted design our clients return to us for. Explore our Portfolio to see how thoughtful architecture takes shape across the valley.

Ready to begin? Call (707) 996-2396 or email info@marcuswillers.com to talk through your project.

Follow Us

MARCUS & WILLERS © 2026 All Rights Reserved