JS Design & Build

JS Design + Build is an in-house design-build remodeling company based in Napa, California, specializing in Accessory Dwelling Units (ADUs), whole-home remodels, and home additions throughout Napa Valley and Sonoma Valley. With more than 45 years of design expertise and over 20 years of construction experience, the company has built a reputation for delivering thoughtfully designed, high-quality residential projects through a seamless, fully integrated process.

By combining designers, builders, and project managers under one roof, JS Design + Build manages every stage of an ADU project—from feasibility studies and conceptual design to permitting, construction, and final walkthrough. The company offers custom detached ADUs, garage conversions, prefabricated ADUs, and interior design services, ensuring homeowners receive a streamlined experience with clear communication, accurate budgeting, and exceptional craftsmanship.

Services

• Accessory Dwelling Units (ADUs)
• Custom ADU Design
• Detached ADUs
• Garage Conversion ADUs
• Prefabricated ADUs
• ADU Feasibility Studies
• Permit & Zoning Assistance
• ADU Project Management
• Whole-Home Remodeling
• Home Additions
• Interior Design
• Kitchen Remodeling
• Bathroom Remodeling
• Architectural Design
• Construction Management
• Design-Build Services

Why Choose JS Design + Build?

• Over 45 years of design experience
• More than 20 years of construction expertise
• Complete in-house design-build team
• Specialists in custom and prefabricated ADUs
• Comprehensive feasibility studies before design begins
• Handles permitting and zoning approvals
• Single point of accountability throughout the project
• Accurate budgeting with fixed-fee planning process
• High-quality craftsmanship and personalized service
• Extensive experience with Napa and Sonoma regulations