ADU Builder Bay Area CA - We Build Custom ADUs of All Types

Q: Garage Conversions

Convert an underused garage into a legal, insulated Accessory Dwelling Unit. We handle structural upgrades, utility connections, and finish work.

More living space, no guesswork. Rock Bay Construction handles every step of your ADU build across the Bay Area.

ADU Construction in the Bay Area

At Rock Bay Construction & Remodeling, we offer complete ADU construction in the Bay Area for homeowners who want a functional, code-compliant build without the confusion. Adding an Accessory Dwelling Unit is one of the best ways to expand your space, generate rental income, or support multigenerational living. Whether you’re converting a garage or building a custom ADU, we handle everything from ADU floor plans to permits and final finishes.

Your Licensed & Expert ADU Builders

We are licensed ADU builders with hands-on experience in Bay Area zoning, permitting, and layout planning. Our team manages the entire process and provides daily oversight on every job. As trusted ADU contractors in the Bay Area, we help homeowners make smart, lasting additions to their properties with clarity and care.

We take care of everything—design, permitting, foundation, framing, and finishes—so you can focus on enjoying your new space. Let us help you create a fully functional ADU that adds value and versatility to your property.

Detached ADUs & Garage Conversions
Custom Layouts & Space Planning
Complete Permit & Code Compliance
High-Quality Construction & Design

Types of ADUs We Build in the Bay Area

We offer full-service design and ADU construction in the Bay Area for a variety of layouts and uses. ADUs add flexible living space, improve property value, and support long-term use without changing your main home.

A stand-alone unit that adds living space without touching the main home. These are ideal for rentals, guest houses, or private living for family members.

Built as an extension of your home, these share one wall but have a separate entrance. Great for semi-private living or extra rental income.

Convert an underused garage into a legal, insulated Accessory Dwelling Unit. We handle structural upgrades, utility connections, and finish work.

Smaller units built within the home’s existing footprint. Often created from unused rooms or garage space, they’re a lower-cost option with full functionality.

Convert an existing basement into a private living unit with a separate entrance. Basement ADUs are ideal for maximizing underused space without expanding your home’s footprint.

Add a small extension to the side or rear of your home to create a fully functional ADU. Bump-outs work well on lots with limited space for detached units.

Compact, standalone ADUs built permanently on-site. These are ideal for small lots and are fully code-compliant with plumbing, electrical, and insulation built in.

Why Build an ADU in the Bay Area?

The demand for ADU in the Bay Area continues to grow. Families use them for aging parents, young adults, or as rental units to offset mortgage costs. Whether you’re building an ADU for personal use or income, we make the process efficient, legal, and tailored to your goals.

Our team ensures your ADU construction Bay Area project is fully permitted and ready to live in.

Call Now (415) 730-2856

How Much Does ADU Cost in the Bay Area?

ADU cost in the Bay Area depends on square footage, access, type of ADU, and materials. Detached ADUs usually cost more than garage conversions or JADUs.

We give you clear pricing and walk you through every step so you can plan the ADU confidently.

Let’s Build Your Bay Area ADU

If you’re planning an ADU in the Bay Area, talk to Rock Bay. From initial planning to the final inspection, we keep your project on track and on budget. Let’s get started on your next ADU building project.

Call Now (415) 730-2856

Why Choose Rock Bay Construction & Remodeling

We are a design-build company with over 10 years of experience working on Bay Area homes. Our team takes on every project with the same level of care whether you’re remodeling a kitchen in Bay Area, adding a story, or rebuilding the entire interior. We handle design, build, and everything in between.

100% Customer Satisfaction Guaranteed

Our team ensures that all of our customers are completely happy with the work that we do, exceeding your expectations rather than just meeting them.

Free Design and 3D Renderings

We provide design consultations and 3D renderings at no additional cost. These services are simply part of the process and will never be an add-on.

In-House Team and Quality Control

Our in-house team consists of designers, tradespeople, and project managers, all of whom are committed to maintaining the highest quality work throughout the entire process.

Budget Planning Support

We offer flexible financing options and budget planning support in order to make it easier and more affordable to get the remodel that you want.

Respect for You and Your Time

Your time matters, so we always make sure to stick to the timelines we give you and keep up open lines of communication.

10+ Years of Experience

Our extensive industry experience is what makes us a trusted design-build firm in the Bay Area.

Design-Build Homes With the Same Team Throughout the Bay Area

Rock Bay Construction & Remodeling serves homeowners throughout the Bay Area, providing full-service remodeling, additions, ADU construction and new home construction from planning through completion.

Don’t see your city?

We work throughout the greater Bay Area. Contact our team to confirm service availability for your project.