In the picturesque and family-oriented town of Danville, more and more homeowners are discovering the value of building an Accessory Dwelling Unit (ADU). Whether you’re planning for multigenerational living, a home office, or passive rental income, an ADU offers a smart way to grow your living space without leaving your community.

At Royalty Builders, we specialize in high-end, fully permitted ADUs designed to complement the unique character of Danville homes. From design to permits to construction, we handle every detail—delivering results that are functional, elegant, and built to last.

Types of ADUs We Build in Danville

Every property in Danville is unique, and every ADU we build reflects the specific goals of the homeowner. Whether you’re maximizing a hillside lot or transforming an unused garage, we tailor the design to your home and lifestyle.

We offer:

• Detached ADUs – Great for guesthouses, private rentals, or caregiver suites

• Attached ADUs – Seamless extensions that add livable square footage

• Garage Conversions – Turn your existing garage into a comfortable, code-compliant unit

• Above-Garage ADUs – Smart vertical builds for properties with limited ground space

• Basement Conversions – Ideal for homes with underutilized lower levels

Each unit is thoughtfully designed to comply with Danville and Contra Costa County regulations and to preserve the aesthetics of your neighborhood.

Full-Service ADU Design + Build in Danville

At Royalty Builders, we make the process stress-free with our design-build model. You’ll work with one trusted team from concept to completion—no juggling of architects, engineers, and contractors.

Our all-inclusive service includes:

• Feasibility review and zoning research

• Custom architectural and 3D design

• Structural engineering and Title 24 energy compliance

• Full permitting through the Town of Danville and Contra Costa County

• High-quality construction and project management

• Final inspection, utility coordination, and occupancy certification

From traditional to modern styles, we bring your vision to life with expert care and craftsmanship.

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

The cost to build an ADU in Danville depends on the type, finishes, and lot conditions. Whether you’re repurposing an existing structure or building from the ground up, we provide clear, detailed quotes tailored to your goals.

Typical ADU pricing in Danville:

• Garage Conversion: $130,000 – $180,000

• Attached ADU: $190,000 – $300,000

• Detached ADU: $225,000 – $375,000+

• Above-Garage ADU: $240,000 – $390,000+

We also help you explore financing options, including home equity solutions and renovation loans designed specifically for ADU construction.

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

Danville supports ADU development but has its own design and planning standards, especially in hillside areas and historical zones. We have years of experience working with the Town of Danville Planning Department, and we ensure your project moves through permitting efficiently and correctly.

We handle:

• Lot and zoning assessments

• Site planning and design compliance

• Permit application and architectural reviews

• Responses to corrections and plan revisions

• Coordination of inspections and final sign-off

We manage the red tape so you don’t have to.

Why Build an ADU in Danville?

Danville offers top-tier schools, peaceful neighborhoods, and strong property values—making it one of the most sought-after communities in the East Bay. Building an ADU here is a smart investment for today and the future.

Benefits of building an ADU in Danville:

• 🏠 Create flexible space for guests, family, or staff

• 💼 Add a home office or studio away from daily distractions

• 💸 Generate rental income with a private, self-contained unit

• 📈 Boost resale value with highly desirable additional living space

• 🔁 Future-proof your property with multigenerational options

Whether your goal is comfort, income, or flexibility—an ADU is the answer.

Frequently Asked Questions – ADUs in Danville

Q: What is the maximum size for an ADU in Danville?
A: Most detached ADUs can be up to 1,200 sq. ft. depending on lot size, setbacks, and zoning. We’ll assess your property during your free consultation.

Q: Will I need HOA approval?
A: Some neighborhoods in Danville have HOAs with their own design rules. We’ll help you confirm requirements and manage the approval process.

Q: How long does the process take?
A: Most ADUs take 6–10 months, from design through construction and final approvals. We’ll provide a timeline specific to your project.

Q: Can I rent out my ADU in Danville?
A: Yes, long-term rentals are permitted. Short-term rentals (like Airbnb) may have restrictions depending on zoning.

Contact Royalty Builders – Danville’s Local ADU Experts

If you’re ready to elevate your property with a beautiful, functional ADU, Royalty Builders is here to help. We deliver expert design, smooth permitting, and superior construction—backed by local knowledge and a commitment to excellence.

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

Trusted by East Bay homeowners. Built by Royalty.