Walnut Creek is a vibrant city known for its blend of urban amenities and suburban charm, making it an excellent location for building an Accessory Dwelling Unit (ADU). Whether you’re looking to add a guest house, a private office, or a rental unit, ADUs offer flexibility, comfort, and long-term value.

At Royalty Builders, we specialize in designing and constructing custom ADUs that integrate seamlessly with your property’s architecture and the surrounding neighborhood. From initial planning to final inspection, we ensure a smooth and high-quality experience.

Types of ADUs We Build in Walnut Creek

Walnut Creek properties vary in size and terrain, allowing us to create ADUs tailored to your needs. Our expertise includes:

• Detached ADUs – Ideal for guest houses, rental units, or multigenerational living.

• Attached ADUs – Extensions that enhance your home without disrupting its layout.

• Garage Conversions – Transform unused garage space into a polished living area.

• Above-Garage ADUs – Smart vertical solutions for smaller lots or private studios.

• Basement Conversions – Utilize existing space for fully equipped lower-level units.

All designs comply with Contra Costa County regulations and Walnut Creek’s specific guidelines.

Full-Service ADU Design + Build in Walnut Creek

Our comprehensive design-build service ensures every step of your ADU project is handled in-house. Services include:

• Property analysis and zoning review

• Custom architectural plans and 3D visualization

• Engineering and Title 24 energy compliance

• Full permitting through Walnut Creek’s Community Development Department

• High-quality construction with premium finishes

• Final inspections, utility tie-ins, and occupancy clearance

We focus on creating functional yet luxurious spaces that elevate your property.

How Much Does It Cost to Build an ADU in Walnut Creek?

Walnut Creek offers diverse property types that influence pricing. We work closely with homeowners to develop tailored budgets. Typical costs include:

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

• Attached ADU: $190,000–$310,000

• Detached ADU: $225,000–$400,000+

• Above-Garage ADU: $240,000–$420,000+

We also provide guidance on financing options such as home equity loans or the CalHFA ADU Grant Program.

Permits for ADU Construction in Walnut Creek

Walnut Creek has specific permitting requirements for ADUs. We handle:

• Lot and zoning assessments

• Permit documentation and plan submittals

• Compliance with setback rules (minimum 4 feet from property lines)

• Parking provisions (if applicable)

• Final inspections and occupancy approval

Our team ensures your project adheres to all regulations for hassle-free approval.

Why Build an ADU in Walnut Creek?

ADUs are a practical investment that enhances property value while offering versatile living solutions. Top reasons include:

• Private space for guests or family members

• Rental income opportunities

• Home offices or creative studios

• Higher resale value

• Multigenerational housing options

With Walnut Creek’s growing demand for flexible housing solutions, an ADU is a smart addition to any property.

Frequently Asked Questions – Walnut Creek ADUs

Q: Can I build an ADU on my property in Walnut Creek?
A: Most properties qualify. We’ll evaluate zoning and lot size during consultation.

Q: What are the size limits for an ADU?
A: Detached units can range from 850 sq. ft. (one-bedroom) to 1,000 sq. ft. (two-bedroom).

Q: Can I rent out my ADU?
A: Yes, long-term rentals are permitted; however, short-term rentals like Airbnb are restricted.

Contact Royalty Builders – Walnut Creek’s Trusted ADU Contractor

Looking to create a beautiful and compliant ADU in Walnut Creek? Whether it’s a guest house, rental suite, or private office, Royalty Builders is your trusted partner for thoughtful design and premium construction.

📞 Contact us today for a free consultation!