As housing demand continues to grow in the Bay Area, homeowners in Alameda are discovering the many benefits of building an Accessory Dwelling Unit (ADU). Whether you’re adding space for extended family, creating a home office or rental unit, or future-proofing your property, an ADU offers a smart and flexible solution.

At Royalty Builders, we specialize in designing and building custom ADUs that fit perfectly into your existing property—while adding long-term value, comfort, and versatility. We’re proud to serve Alameda with full-service ADU solutions tailored to your needs.

Types of ADUs We Build in Alameda

No two homes—or homeowners—are the same. That’s why Royalty Builders offers a range of ADU styles to fit your property layout, your lifestyle, and your goals. Whether you have a large backyard or an unused garage, we’ll help you unlock your property’s full potential.

We build:

• Detached ADUs – Private, stand-alone backyard homes perfect for rentals, guests, or family

• Attached ADUs – Built onto your home, sharing one wall and blending seamlessly with the main structure

• Garage Conversions – Transform existing garages into livable, fully finished units

• Above-Garage ADUs – Utilize vertical space for a functional and stylish loft or studio

• Basement ADUs – Make the most of existing square footage with a legal basement conversion

Each design is fully customized to your space, preferences, and Alameda’s building codes.

Full-Service ADU Design + Build in Alameda

At Royalty Builders, we offer a start-to-finish design-build process. That means your entire project—planning, permitting, and construction—is managed by one experienced team. No juggling between architects, city offices, and contractors.

Our all-inclusive services include:

• On-site evaluation and feasibility analysis

• Custom architectural and 3D design

• Structural engineering and planning

• Complete permit management

• Full-scale construction and finishing

• Utility hookups, inspections, and final approval

We streamline every step so your Alameda ADU project runs smoothly, stays on budget, and finishes on time.

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

Costs can vary significantly depending on your ADU type, size, finishes, and the condition of the existing lot or structure. At Royalty Builders, we believe in full transparency—no hidden fees, no vague estimates.

Typical ADU costs in Alameda:

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

• Attached ADU: $180,000 – $290,000

• Detached ADU: $200,000 – $350,000+

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

We work with your budget and help explore financing options to make building an ADU more accessible.

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

Navigating the permitting process in Alameda can be challenging without guidance. That’s why our team handles everything for you—from the first application to final approval. We’re familiar with Alameda’s unique zoning requirements, height limits, setbacks, and historical property considerations.

Our permit management includes:

• Zoning and code compliance review

• Submission of architectural and engineering plans

• Coordination with Alameda building officials

• Revisions, resubmittals, and inspection scheduling

• Occupancy certification

With Royalty Builders, you won’t need to chase paperwork—we take care of it all.

Why Build an ADU in Alameda?

Alameda is a coastal city full of charm, history, and vibrant community life. With its proximity to Oakland, San Francisco, and Silicon Valley, it’s a prime location for homeowners who want to maximize their space and long-term property value.

Building an ADU in Alameda offers several powerful advantages:

• 🏠 Space for family or guests – Whether it’s aging parents, adult children, or out-of-town visitors

• 💼 Remote work flexibility – Create a quiet home office or creative studio

• 💰 Rental income opportunity – Tap into Alameda’s strong rental demand

• 📈 Increased resale value – Add long-term worth to your property

Alameda’s support for infill development and California’s relaxed ADU laws make now the perfect time to invest in your property with a custom-built ADU.

Frequently Asked Questions – ADUs in Alameda

Q: What is the maximum ADU size allowed in Alameda?
A: Detached ADUs can be up to 1,000 sq. ft., depending on your lot and zoning. We’ll help determine what’s feasible on your property.

Q: Do I need to provide parking for an ADU?
A: In many cases, parking requirements are waived—especially if your property is near public transit or the ADU is built within an existing structure.

Q: How long does the ADU process take?
A: On average, from design to move-in, expect 6–10 months, depending on design complexity and permitting timelines.

Q: Can I use my ADU as a rental unit?
A: Yes! Alameda allows ADUs to be used as long-term rentals. We’ll ensure your unit is fully code-compliant for that purpose.

Contact Royalty Builders – Your Alameda ADU Contractor

If you’re considering an ADU in Alameda, now is the time to take the first step. Royalty Builders is here to guide you through every stage—from concept and permits to final walkthrough.

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

Build smart. Build local. Build with Royalty Builders.