As one of the fastest-growing cities in the Bay Area, Fremont continues to attract families, professionals, and investors looking for smart housing solutions. Building an Accessory Dwelling Unit (ADU) is one of the most effective ways to expand your living space, create passive income, and increase long-term property value—all without leaving the home you love.

At Royalty Builders, we bring years of ADU expertise to Fremont homeowners. From concept to construction, our team handles every aspect of the process with professionalism, creativity, and full compliance with local and state regulations.

Types of ADUs We Build in Fremont

Whether you have a growing family, aging parents, or simply want to boost your property’s functionality, there’s an ADU style that fits your needs. At Royalty Builders, we build a wide range of ADU types designed to work with your space and budget:

• Detached ADUs – Fully independent structures ideal for rental income or private guest houses

• Attached ADUs – Seamlessly connected to your existing home, perfect for in-laws or teen suites

• Garage Conversions – Turn unused garages into efficient, livable units

• Above-Garage ADUs – Add square footage vertically without sacrificing yard space

• Basement ADUs – Convert existing below-ground space into beautiful, code-compliant living quarters

We guide you through the decision process to choose the right option that aligns with your lifestyle and Fremont’s zoning requirements.

Full-Service ADU Design + Build in Fremont

At Royalty Builders, we believe in a streamlined, hassle-free experience. Our design-build model ensures that your entire ADU project—planning, permitting, and building—is managed by one dedicated team. No need to coordinate with multiple vendors.

Our comprehensive service includes:

• Initial site visit and feasibility assessment

• Custom ADU design and 3D visualization

• Structural engineering and energy compliance

• Full permit submission and city approvals

• Professional construction, finishing, and final inspection

You’ll have a single point of contact throughout the process and complete visibility into the schedule, cost, and milestones.

How Much Does It Cost to Build an ADU in Fremont?

Fremont is a diverse city with a wide range of lot sizes and building types, so ADU costs vary depending on your property, design complexity, and construction preferences. At Royalty Builders, we prioritize transparent, up-front pricing to ensure no surprises.

Average ADU construction costs in Fremont:

• Garage Conversion: $120,000 – $175,000

• Attached ADU: $180,000 – $300,000

• Detached ADU: $200,000 – $350,000+

• Above-Garage ADU: $220,000 – $360,000

We also offer guidance on ADU financing options, helping you achieve your goals within your budget.

Permits for ADU Construction in Fremont – What You Need to Know

Fremont follows California’s ADU-friendly legislation, but there are still city-specific requirements you must follow. Our team has deep experience navigating Fremont’s building department, ensuring every aspect of your project is approved quickly and correctly.

We handle:

• Reviewing lot eligibility and local zoning restrictions

• Preparing and submitting full permit packages

• Responding to plan check corrections

• Coordinating all city inspections

• Ensuring your ADU is built to current code

Whether your lot is in a hillside district, within a flood zone, or near a transit corridor, we know how to manage the details and avoid costly delays.

Why Build an ADU in Fremont?

Fremont is one of the most dynamic and desirable places to live in the East Bay. With its strong job market, diverse neighborhoods, excellent schools, and central location near Silicon Valley, homeowners here have every reason to invest in their property.

An ADU in Fremont provides:

• 🏘 Flexible space for family members, guests, or remote work

• 💸 Rental income potential in a high-demand housing market

• 🧓 Support for aging in place or multigenerational living

• 📈 Increased resale value in a city with growing property demand

With California’s supportive laws and Fremont’s growing population, now is the ideal time to expand your home’s footprint—and functionality.

Frequently Asked Questions – ADUs in Fremont

Q: What size ADU can I build in Fremont?
A: Most detached ADUs can be up to 800–1,000 sq. ft. depending on your lot size. Some lots may allow even more—our team will help assess your maximum potential.

Q: Do ADUs in Fremont require additional parking?
A: In many cases, no. If your property is near public transportation or the ADU is converted from an existing space, parking requirements are waived.

Q: How long does the ADU process take?
A: On average, 6–10 months from design to final inspection. Timelines can vary based on permitting and construction complexity.

Q: Can I rent out my ADU?
A: Yes! Fremont allows long-term rentals of permitted ADUs. Our team ensures full compliance with all rental and zoning codes.

Contact Royalty Builders – Your Fremont ADU Contractor

Ready to build your dream ADU in Fremont? Whether you’re exploring your options or already have a vision in mind, Royalty Builders is here to bring it to life—with expert guidance and unmatched quality.

📞 Contact us today and schedule your free ADU consultation in Fremont.

Smart design. Seamless build. That’s the Royalty Builders way.