Millstreet Builders is a Marin County family business with more than 30 years of construction experience. We specialize in custom residential projects and remodels across Marin, Sonoma, and Napa—blending craftsmanship with modern function.

As a referral-based company, our reputation is our most important asset. We’ve built lasting relationships with architects, real estate professionals, and a trusted network of subcontractors, ensuring every project is delivered with integrity, transparency, and care.

Working Seamlessly with Designers

We believe the best homes are built on collaboration. That’s why we work closely with designers to support clients through every decision. Whether it’s refining finishes, coordinating layouts, or bringing a high-end concept into reality, our team makes the process smooth, supported, and stress-free.

With every project, we carry forward the same principles that have guided us for three decades: quality, accountability, and a commitment to building homes that feel as good as they look.