Expert ADU Builders in Napa & Sonoma Valleys
At JS Design + Build, we simplify Accessory Dwelling Unit (ADU) construction by managing every part of your project under one roof — from initial design concepts to the final walkthrough.
Based in Napa and serving St. Helena, Calistoga, and our neighbors in Sonoma, Solano, and Green Valley, we’re a full-service ADU builder with the experience to navigate local codes, streamline approvals, and deliver exceptional results. Our in-house team of designers, builders, and project managers ensures seamless communication, consistent quality, and on-time, on-budget completion.
Whether you’re adding an income-generating rental, creating a private guesthouse, or expanding space for family, we provide the expertise and accountability you need for building an ADU successfully.