Redwood City is one of the most vibrant and fast-growing communities on the Peninsula, making it a prime location for building an Accessory Dwelling Unit (ADU). Whether you’re looking to increase property value, create a long-term rental unit, or add space for family, Royalty Builders is your trusted Redwood City ADU contractor offering start-to-finish design + build services.

We make it easy to turn your backyard, garage, or unused space into a modern, fully functional dwelling—designed to meet your needs and built to last.

Why Build an ADU in Redwood City?

Redwood City offers a rare combination of sunny weather, walkable neighborhoods, strong rental demand, and proximity to major employers in Silicon Valley. Adding an ADU is a smart investment for homeowners who want to:

• Create passive rental income in a high-demand housing market

• Offer private living quarters for parents, children, or guests

• Add a home office, wellness space, or studio

• Increase property value and future flexibility

• Support multi-generational living without sacrificing privacy

Thanks to California’s streamlined ADU laws and Redwood City’s commitment to expanding housing options, it’s now faster and more affordable than ever to add an ADU to your property.

Full-Service ADU Design + Build in Redwood City

At Royalty Builders, we manage every aspect of the ADU project in-house—from initial concept to final inspection. Our experienced team of designers, contractors, and permit specialists works together to deliver a smooth, efficient experience with stunning results.

Here’s what our process includes:

• On-Site Evaluation & Feasibility Study: We assess your lot and zoning to determine the best ADU type and placement.

• Custom Design & Floorplan Creation: You’ll collaborate with our design team to create a unit that’s functional, stylish, and tailored to your needs.

• Permitting & Approvals: We handle all documentation and communications with the City of Redwood City for swift and compliant permit approval.

• Construction Management: Our skilled crew uses quality materials and precise techniques to build your ADU efficiently and professionally.

• Walkthrough & Final Sign-Off: We inspect every detail to ensure your complete satisfaction and a turnkey finished product.

We pride ourselves on making the process simple, transparent, and enjoyable for homeowners throughout Redwood City.

Types of ADUs We Build in Redwood City

Redwood City’s diverse housing stock and lot sizes allow for a wide variety of ADU configurations. We build:

• Detached ADUs: Standalone backyard cottages or rental units with complete privacy.

• Attached ADUs: Seamlessly integrated into your main home, perfect for extended family or long-term guests.

• Garage Conversions: An affordable way to create living space without expanding your footprint.

• Above-Garage Units: Great for maximizing vertical space and creating private, elevated living quarters.

• Junior ADUs (JADUs): Small units built within your home’s existing structure, often using spare bedrooms or underutilized areas.

Each project is fully customized to fit your goals, property constraints, and local requirements.

How Much Does It Cost to Build an ADU in Redwood City?

ADU construction costs in Redwood City vary depending on your property, layout, finish level, and type of unit. As a general guideline:

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

• Attached ADU: $200,000 – $350,000

• Detached ADU: $250,000 – $400,000+

• Custom/Luxury ADUs: $500,000 and up

Factors that influence the cost include:

• Size and complexity of the unit

• Site prep and utility connections

• Interior materials and finishes

• Permitting and fees

• Special upgrades (solar, smart tech, accessibility)

We provide a detailed cost breakdown and free consultation, so you can make informed decisions from day one.

ADU Permit Process in Redwood City

Redwood City follows California state ADU legislation, which means the city must approve most compliant ADU projects within 60 days. Royalty Builders manages the entire permit process for you, saving time and avoiding complications.

Our permitting services include:

• Preparing architectural drawings and construction documents

• Coordinating with the Redwood City Building Division

• Ensuring your ADU complies with setback, height, and parking requirements

• Responding to city plan checks and corrections

• Finalizing inspections for occupancy approval

We’re familiar with the city’s permitting expectations, helping to streamline the process from start to finish.

Frequently Asked Questions – ADU Services in Redwood City

Q: Can I build a two-story ADU in Redwood City?
A: Yes, two-story ADUs are allowed in many residential zones, depending on setbacks, lot size, and height limits. We’ll help confirm your eligibility.

Q: Will my ADU require a separate utility hookup?
A: Not always. Some ADUs can share existing utilities; others may require separate meters. We’ll assess what’s most efficient and code-compliant.

Q: How long does an ADU project typically take?
A: The average timeline is 6 to 10 months, including design, permitting, and construction.

Q: Can I rent out my ADU?
A: Absolutely. Redwood City allows homeowners to rent ADUs to long-term tenants. This can provide reliable income in a strong rental market.

Q: Will building an ADU raise my property taxes?
A: Only the new construction (the ADU) is reassessed. Your main home’s tax base remains unchanged.

Why Choose Royalty Builders for Your Redwood City ADU?

• 🏗 Full-Service Design + Build Firm

• 🧠 Deep Knowledge of Redwood City Zoning and Permits

• 🛠 High-Quality Craftsmanship with Durable Materials

• ✅ Transparent Pricing & Reliable Timelines

• ✍️ Custom Designs that Fit Your Home and Lifestyle

• 🌟 Dozens of Satisfied Clients Across the Peninsula

Our mission is simple: to make your ADU project stress-free, beautiful, and built to last.

Ready to Build Your ADU in Redwood City?

If you’re ready to add space, value, and income potential to your Redwood City property, we’re here to help. Contact Royalty Builders today for a free ADU consultation and let’s explore your options together.

Call us today and schedule a free consultation.