ADU Contractor Grass Valley
Efficient Builds for Elevated Living
Looking to expand your living space, create rental income, or support multigenerational living? A custom Accessory Dwelling Unit (ADU) is a smart, flexible way to add value to your property—and Gustin and Sumida Construction is here to help you do it right. As a trusted ADU contractor in Grass Valley, we bring decades of experience, local insight, and full-service support to every project. From design to final inspection, we make building an ADU efficient, affordable, and stress-free.
Serving Grass Valley, Nevada City, and surrounding Sierra Nevada Foothills communities, we specialize in creating high-quality detached and attached ADUs that fit your land, lifestyle, and long-term goals.
Our Full-Service ADU Building Process
At Gustin and Sumida Construction, we handle every phase of your ADU project with care, precision, and attention to detail—so you can focus on the big picture.
Design & Planning
We start by working with you to design a space that aligns with your property layout, lifestyle, and vision. Whether you want a simple studio or a fully self-contained one-bedroom unit, our team will create a functional, beautiful plan tailored to your needs.
Permitting & Compliance
ADU regulations in the Sierra Nevada Foothills can vary by location. Our team navigates local zoning laws, permitting requirements, and building codes in Grass Valley, Nevada City, and unincorporated areas to ensure your project runs smoothly from the start.
Construction & Finishing
From site prep and foundation to framing, roofing, and interiors, we manage every aspect of construction. We use quality materials built for foothill climates and finish your ADU with durable, stylish fixtures and finishes.
Project Management
We keep you informed every step of the way. Our process emphasizes clear communication, budget transparency, and reliable scheduling—so your ADU is built on time and on budget.
Why Homeowners Trust Gustin and Sumida Construction
We’re more than just contractors—we’re part of your community. Based in Grass Valley, Gustin and Sumida Construction has earned a reputation for delivering exceptional work with a personal touch. Whether we’re building a Nevada City guest house, a rural foothill studio, or a multi-use ADU addition, we bring local expertise and professionalism to every job.
What Sets Us Apart:
Decades of residential construction experience
Deep knowledge of Sierra Foothills zoning and permitting
Licensed, insured, and locally trusted
Hands-on project management by experienced builders
Honest estimates and dependable timelines
Tailored design to match your home and lot
We don’t believe in one-size-fits-all. Every ADU we build is customized to suit your vision and property—ensuring it adds real value for years to come.
Let’s Plan Your ADU Project Today
Ready to expand your living space with a custom-built ADU? Whether you’re in Grass Valley, Nevada City, or elsewhere in the Sierra Nevada Foothills, Gustin and Sumida Construction is here to make it happen—with quality, care, and craftsmanship.
Contact us now to schedule a consultation or request a quote. Let’s build something smart—together.
Proudly Serving the Sierra Nevada Foothills
Gustin and Sumida Construction offers expert home remodeling services throughout the Sierra Nevada Foothills region, including:
Grass Valley
Nevada City
Auburn
Colfax
Penn Valley
Meadow Vista
Alta Sierra
Foresthill
And the surrounding mountain and foothill communities. Whether you're nestled in a quiet rural neighborhood or located in a historic downtown district, we're your trusted local partner for high-quality renovations.