In the evolving East Bay housing landscape, Mount Eden homeowners are exploring new ways to maximize their space—and building an Accessory Dwelling Unit (ADU) is one of the most effective. Whether you’re expanding for family, creating a private home office, or adding a rental unit, an ADU brings long-term value and daily convenience.

Royalty Builders is your local expert in ADU planning, design, permits, and construction. We deliver high-quality work with full transparency and a streamlined process—so you get the space you need, on the timeline and budget that work for you.

Types of ADUs We Build in Mount Eden

We understand that every homeowner’s needs are different. That’s why we offer multiple types of ADUs, each fully customizable to fit your property’s layout, zoning, and design goals.

We specialize in:

• Detached ADUs – Freestanding structures ideal for privacy, rentals, or guest accommodations

• Attached ADUs – Extensions that seamlessly integrate with your home

• Garage Conversions – Transform existing garages into livable spaces efficiently and affordably

• Above-Garage ADUs – A smart choice when yard space is limited

• Basement Conversions – Ideal for homeowners looking to unlock unused lower-level space

Every ADU we build in Mount Eden complies with local and state codes while reflecting your unique style.

Full-Service ADU Design + Build in Mount Eden

Royalty Builders offers a full-service design-build model, managing the entire ADU process from first consultation to final inspection. We handle every detail in-house—including design, engineering, permits, and construction—so you don’t have to juggle multiple vendors.

Our services include:

• Zoning and feasibility review

• Architectural design and 3D visualization

• Engineering and structural planning

• Full permit submission with Alameda County

• Construction management and final walkthrough

• Utility hookups, code compliance, and occupancy

You’ll benefit from clear timelines, ongoing updates, and a team that truly cares about your satisfaction.

How Much Does It Cost to Build an ADU in Mount Eden?

Pricing for ADUs in Mount Eden varies depending on the structure type, finishes, lot layout, and design complexity. We offer clear, upfront pricing so you always know what to expect.

Estimated cost ranges in Mount Eden:

• Garage Conversion: $120,000 – $170,000

• Attached ADU: $180,000 – $290,000

• Detached ADU: $200,000 – $350,000+

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

We’ll also help you explore financing options and build a plan that works for your financial goals.

Permits for ADU Construction in Mount Eden – What You Need to Know

Mount Eden, as part of unincorporated Alameda County, follows California’s streamlined ADU regulations but still requires careful attention to local zoning, size limits, and site conditions. That’s why we handle the permitting process from start to finish.

We take care of:

• Property assessments and setback reviews

• Preparation and submission of plans to Alameda County

• Responses to corrections and plan check feedback

• Coordination with building inspectors

• Final approvals and sign-off for occupancy

With Royalty Builders, you don’t have to navigate permits alone—we know the process, and we do it right.

Why Build an ADU in Mount Eden?

Mount Eden offers a quiet, residential lifestyle with convenient access to the rest of the Bay Area. As property values increase and multigenerational living becomes more common, building an ADU in Mount Eden is a smart, future-ready decision.

Here’s why homeowners are adding ADUs in Mount Eden:

• 🏘 Space for family or guests – without the need for a costly move

• 💼 Home office or studio – create separation between work and life

• 💸 Rental income – capitalize on local housing demand

• 📈 Increase resale value – homes with ADUs attract more buyers

• 🔧 Adaptability – customize your home for long-term lifestyle changes

With California’s ADU-friendly laws and Alameda County’s support for additional housing, now is the perfect time to expand.

Frequently Asked Questions – ADUs in Mount Eden

Q: How big can an ADU be in Mount Eden?
A: Detached ADUs can generally be up to 1,200 sq. ft. depending on lot size and zoning. We’ll help confirm what’s allowed for your specific property.

Q: Are additional parking spaces required?
A: In most cases, no—especially if your home is near transit or converting an existing space. We’ll review your lot for compliance.

Q: What’s the average timeline for building an ADU?
A: Most ADU projects take 6–10 months from design to final inspection, depending on complexity and permits.

Q: Can I rent out my ADU in Mount Eden?
A: Yes, long-term rentals are allowed in compliant ADUs. We’ll ensure your unit meets all legal requirements for occupancy.

Contact Royalty Builders – Mount Eden’s ADU Experts

Thinking about expanding your Mount Eden property with a legal, beautiful, and functional ADU? Royalty Builders is here to help—offering expert guidance, reliable timelines, and construction you can count on.

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

Build smarter. Live better. Royalty Builders.