ADU and JADU

Full-Service ADU Builder in the San Francisco Bay Area - ADU, JADU, Garage Conversions

From Design and Permits to Construction — We Build Beautiful, Fully Customized ADUs from Start to Finish.

At Mars Construction and Remodeling, we specialize in designing and building high-quality Accessory Dwelling Units (ADUs) throughout the Bay Area and San Francisco. With over a decade of experience, our team has extensive knowledge of California ADU laws, local zoning requirements, permitting procedures, and modern construction standards, allowing us to guide homeowners through the entire process with confidence and ease.

We have successfully completed ADU construction projects across San Francisco, San Jose, South Bay, Alameda County, Contra Costa County, and surrounding communities. Whether you are planning a detached ADU, garage conversion, JADU, in-law suite, backyard cottage, rental unit, guest house, or multigenerational living space, we provide complete design-build services tailored to your property, lifestyle, and budget.

Our experienced team manages every phase of the ADU process in-house — including feasibility studies, architectural plans, engineering, permitting, material selection, construction, and final inspections. By handling everything under one roof, we create a smoother, faster, and more organized experience for homeowners while maintaining exceptional quality control throughout the project.

Why Homeowners Choose Mars Construction for ADU Projects

Building an ADU in California requires much more than construction experience. Every city has different zoning regulations, setback requirements, height restrictions, utility requirements, parking considerations, and permitting timelines. Our team understands the complexities of local building departments and stays current with evolving California ADU regulations to help clients avoid costly mistakes, delays, and compliance issues.

In many cases, detached ADUs can be built up to 16 feet tall, while setback requirements often vary based on the property and local zoning regulations. Some cities may approve permits within days, while others require longer review periods. Our experience working throughout the Bay Area allows us to efficiently navigate these differences and streamline the approval process whenever possible.

Clients choose Mars Construction because we combine professional project management, premium craftsmanship, clear communication, and personalized service to deliver beautiful ADUs built to last.

Our ADU Design & Construction Process

1. Initial Consultation

Every ADU project begins with a detailed consultation where we discuss your goals, budget, timeline, and ideas for the space. We evaluate your property, explain available ADU options, and help determine the best approach based on your needs and local zoning requirements.

2. Site Evaluation & Feasibility Study

Our team performs a comprehensive site assessment to evaluate lot size, setbacks, access, utility connections, grading, and construction feasibility. This step helps us identify opportunities and potential challenges before design begins.

3. Architectural Design & Planning

We work closely with our in-house designer, architects, and engineers to create custom floor plans, elevations, and 3D renderings tailored to your vision. During this phase, we also help guide material and finish selections to create a functional and visually stunning living space.

4. Permitting & City Approvals

Mars Construction handles the complete permitting process, including preparation and submission of architectural plans, engineering documents, applications, and revisions requested by the city. We coordinate directly with local building departments and inspectors to help move the project forward as efficiently as possible.

5. Construction Preparation

Once permits are approved, we provide a detailed construction agreement outlining the scope of work, project timeline, and payment schedule. Our team carefully coordinates scheduling, procurement, and project logistics before construction begins.

6. ADU Construction

Our experienced construction team manages every stage of the build, including site preparation, foundation work, framing, roofing, plumbing, electrical, HVAC, insulation, drywall, flooring, cabinetry, finishes, and final detailing. Throughout the project, we maintain clear communication and regular progress updates.

7. Quality Control & Inspections

We take construction quality seriously. Our team performs routine inspections and strict quality control throughout the project to ensure all work meets design specifications, safety requirements, and California building codes.

8. Interior Finishes & Material Selection

We help homeowners select cabinetry, countertops, flooring, tile, lighting, plumbing fixtures, paint colors, appliances, and other interior finishes that align with their style and budget while creating a cohesive and modern design.

9. Exterior & Landscaping

If desired, we can also assist with exterior improvements, hardscaping, landscaping, fencing, pathways, drainage, and outdoor living areas to complement the new ADU and enhance the overall property.

10. Final Walkthrough & Project Completion

After final inspections and approvals are completed, we conduct a detailed walkthrough with the homeowner to ensure every detail meets expectations. Our goal is to deliver a finished ADU that is beautiful, functional, fully code-compliant, and ready for immediate use.

Start Your ADU Project with Confidence

Whether you want to create additional rental income, increase property value, build a private guest house, or create flexible living space for family members, Mars Construction and Remodeling is ready to help bring your vision to life.

Contact our team today to schedule your ADU consultation and discover how easy and stress-free the design-build process can be with the right team by your side.

About Mars Construction and Remodeling

We have been proudly serving homeowners across the Bay Area and San Francisco for over a decade, delivering high-quality remodeling and construction services with exceptional attention to detail. With more than 500 happy clients and a strong reputation built on trust, craftsmanship, and reliability, we specialize in kitchen and bathroom remodeling, home additions, ADUs, full-house renovations, and custom new construction.

Our clients choose us because we provide a smooth, organized, and stress-free construction experience from start to finish. We manage every phase of the project in-house — including architectural plans, engineering, permits, material procurement, and construction — allowing us to maintain quality, efficiency, and clear communication throughout the process. Many homeowners are pleasantly surprised by how quickly and professionally their projects are completed compared to past experiences with other contractors.

At Mars Construction and Remodeling, we believe great construction is about more than just building beautiful spaces — it’s about creating lasting relationships, delivering outstanding service, and treating every home as if it were our own.

How do I start new ADU project?

Starting a new ADU project with Mars Construction and Remodeling is simple, organized, and designed to make the entire process stress-free from the very beginning. The first step is scheduling a consultation with our team so we can learn more about your property, goals, budget, and how you plan to use the ADU — whether it’s for rental income, multigenerational living, a guest house, home office, or additional living space.

During the initial evaluation, we assess your property, zoning possibilities, utility access, and overall project feasibility. Our experienced team will explain different ADU options, potential layouts, estimated timelines, and budget considerations to help you understand the best approach for your property and long-term goals.

Once you are ready to move forward, we begin the design and planning phase. Our in-house team coordinates architectural plans, engineering, design development, and permit preparation while helping you select layouts, finishes, and materials that match your vision and budget. We handle communication with local building departments and manage the entire permitting process to help avoid delays and simplify the experience for homeowners.

After permits are approved, our construction team begins building your ADU with careful project management, daily coordination, and consistent communication throughout every phase of construction. From foundation and framing to final finishes and inspections, we manage the entire process in-house to ensure quality, efficiency, and attention to detail.

With over a decade of experience serving homeowners across the Bay Area and San Francisco, Mars Construction and Remodeling helps clients transform underutilized properties into beautiful, functional, and high-value living spaces built to last.

What are my payment options?

Our advantage is that we are both a supplier and distributor, which allows us to avoid the mark ups that happen in a typical supply chain. Because we manage our own supply, we control our own production and inventory, making us more resilient from the supply chain shortages that are well known in the post-COVID era. While others are raising their prices, we’re passing on savings to our customers.

At Mars Construction and Remodeling, we offer flexible payment options designed to make your remodeling or construction project as smooth and convenient as possible. Our payment schedules are typically divided into progress-based phases, allowing payments to be made as specific stages of work are completed throughout the project.

We believe transparency is essential, which is why every contract includes a clear payment schedule, detailed scope of work, and full explanation of project costs before construction begins. Our team works closely with homeowners to ensure they understand each phase of the project and feel comfortable throughout the entire process.

We accept multiple forms of payment and can also help connect qualified clients with financing options for larger remodeling projects, ADUs, home additions, and new construction. Whether you are planning a kitchen remodel, bathroom renovation, or custom home build, our goal is to provide a professional, organized, and stress-free experience from start to finish.

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