Berkeley is known for its historic neighborhoods, progressive values, and thriving academic and cultural life. For homeowners here, adding an Accessory Dwelling Unit (ADU) is one of the smartest ways to meet changing space needs while increasing property value.

Whether you’re housing family, planning for rental income, or creating a separate home office, ADUs provide flexibility without sacrificing location. At Royalty Builders, we specialize in custom, code-compliant ADUs in Berkeley—designed to blend with your property and built to last.

Types of ADUs We Build in Berkeley

Every home in Berkeley has a unique character, and we believe every ADU should too. Whether you’re working with a Craftsman-style home near Elmwood or a mid-century property in the hills, our team helps you choose the right structure for your needs and lot.

We build:

• Detached ADUs – Backyard cottages that provide total independence for guests, renters, or extended family

• Attached ADUs – Seamlessly added to your existing home and perfect for multigenerational living

• Garage Conversions – An efficient way to turn unused space into a comfortable, livable unit

• Above-Garage ADUs – Maximize square footage vertically with a stylish studio or loft

• Basement Conversions – Legal, code-compliant living spaces for older Berkeley homes with existing lower levels

We customize every design to your preferences and ensure full compliance with Berkeley’s building codes and neighborhood standards.

Full-Service ADU Design + Build in Berkeley

With Royalty Builders, you won’t need to manage architects, engineers, contractors, and permits—we handle everything from start to finish. Our design-build process ensures consistency, accountability, and efficiency.

Here’s what we include:

• On-site evaluation and zoning compliance check

• Custom architectural design and 3D visualization

• Engineering, structural planning, and energy code compliance (Title 24)

• Complete permit management with the City of Berkeley

• Quality construction using licensed tradespeople

• Final inspection, utility setup, and occupancy approval

We’ll be your single point of contact—saving you time, stress, and unnecessary costs.

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

Berkeley properties can vary widely in layout and complexity, which is why we provide detailed, transparent estimates based on your specific project. Whether you’re building new or converting existing space, we’ll help you plan a smart investment.

Typical ADU pricing in Berkeley:

• Garage Conversion: $120,000 – $180,000

• Attached ADU: $180,000 – $290,000

• Detached ADU: $200,000 – $350,000+

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

We’ll also walk you through financing options and project phasing to help you build within your budget.

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

Berkeley has adopted California’s ADU-friendly legislation, but it also has local zoning overlays, fire zones, and historical district considerations that require detailed planning. Fortunately, we’re highly experienced with the Berkeley permitting process and know how to navigate it efficiently.

We handle:

• Site eligibility research and zoning analysis

• Plan submission to Berkeley’s Planning & Building Department

• Historic preservation reviews (if applicable)

• Plan revisions, inspection scheduling, and final sign-offs

• Utility coordination and documentation

You won’t need to worry about forms, fees, or delays—our team handles every detail.

Why Build an ADU in Berkeley?

Berkeley is one of the most desirable places to live in the Bay Area. With limited housing supply, rising home values, and demand for long-term rentals, building an ADU here is more than just smart—it’s future-ready.

Benefits of building an ADU in Berkeley include:

• 🏠 Space for family members or caregivers—without sacrificing privacy

• 💼 Work-from-home options in a private, quiet studio

• 💸 Rental income in one of the most in-demand housing markets

• 📈 Increased resale value with an attractive, flexible asset

• 🔁 Adaptability for multigenerational living or aging in place

An ADU lets you live bigger—without leaving the home and community you love.

Frequently Asked Questions – ADUs in Berkeley

Q: What size ADU can I build in Berkeley?
A: In most cases, detached ADUs can be up to 800–1,200 sq. ft. depending on lot size, setbacks, and zoning. We’ll confirm what’s possible on your property.

Q: Does my ADU need parking?
A: Often not—especially if the home is near public transit or the ADU is part of a garage conversion. We’ll evaluate your situation during the site visit.

Q: What’s the timeline for building an ADU in Berkeley?
A: Most ADUs take between 6–10 months from design through construction. Projects involving historic properties or hillside lots may take longer.

Q: Can I rent my ADU legally in Berkeley?
A: Yes. Long-term rentals are allowed. Berkeley has specific rules about short-term rentals (like Airbnb), which we’ll review with you during planning.

Contact Royalty Builders – Berkeley’s Local ADU Experts

Thinking of building an ADU in Berkeley? Whether you’re creating a peaceful backyard cottage, a stylish rental, or a suite for loved ones, Royalty Builders is your local partner for success. We’ve helped Bay Area homeowners transform their properties—and we’d love to do the same for you.

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

Inspired design. Local expertise. Built with Royalty.