San Leandro’s central East Bay location, community charm, and easy access to transit make it an ideal place to invest in your home—and building an Accessory Dwelling Unit (ADU) is one of the smartest ways to do it. Whether you’re accommodating aging parents, planning for rental income, or creating a private office or studio, an ADU provides flexible living space and long-term value.

At Royalty Builders, we specialize in ADU construction tailored to the needs of San Leandro homeowners. Our end-to-end approach covers everything from custom design to final inspection—making your ADU project efficient, compliant, and beautifully finished.

Types of ADUs We Build in San Leandro

Every home has different opportunities for expansion, and we build the type of ADU that fits your vision and your lot. Whether you’re maximizing your backyard or repurposing an existing structure, we’ll guide you to the right solution.

We build:

• Detached ADUs – Fully independent backyard units perfect for privacy or rental use

• Attached ADUs – Add-ons connected to your main home, ideal for multigenerational families

• Garage Conversions – Fast, cost-effective way to transform underused space

• Above-Garage ADUs – Smart, vertical expansion that works well on compact lots

• Basement ADUs – Great for homeowners looking to unlock value from their lower levels

All designs meet San Leandro’s building code requirements and are customized to your lifestyle and goals.

Full-Service ADU Design + Build in San Leandro

At Royalty Builders, we make the ADU process seamless and stress-free. Our design-build model means one expert team handles your entire project from concept to completion. No outsourcing, no confusion—just smooth communication and results you can count on.

Our complete service includes:

• Site analysis and feasibility review

• Custom architectural design & 3D modeling

• Engineering and Title 24 energy compliance

• Full permit handling with the City of San Leandro

• High-quality construction and project management

• Final walkthrough, inspection, and occupancy

With clear timelines, transparent pricing, and dedicated support, we keep your project on track and on budget.

How Much Does It Cost to Build an ADU in San Leandro?

The cost of building an ADU in San Leandro depends on the size, layout, and condition of your existing property. Whether you’re building new or converting space, we provide accurate, up-front quotes to help you plan with confidence.

Typical cost ranges in San Leandro:

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

• Attached ADU: $180,000 – $290,000

• Detached ADU: $200,000 – $350,000+

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

We also help you explore financing options, including renovation loans and home equity strategies to support your investment.

Permits for ADU Construction in San Leandro – What You Need to Know

San Leandro is supportive of ADU construction, but local permitting still requires knowledge of city-specific codes, zoning rules, and application procedures. That’s where we come in.

Royalty Builders handles:

• Lot analysis and zoning confirmation

• Architectural and engineering plan preparation

• Submittals, revisions, and city plan check

• Coordination with building inspectors and public works

• Utility tie-ins and final occupancy approval

Our permitting experts work closely with the City of San Leandro to keep your project moving forward without delays.

Why Build an ADU in San Leandro?

San Leandro is a dynamic, well-connected city with great schools, established neighborhoods, and strong real estate appreciation. Whether you’re planning for family or future income, an ADU is a smart, flexible investment.

Here’s why homeowners in San Leandro are building ADUs:

• 🏘 Support multigenerational living without overcrowding

• 💼 Add dedicated office or creative studio space

• 💰 Generate passive income through long-term rental opportunities

• 📈 Boost resale value with functional square footage

• 🔁 Adapt your home for future needs like aging in place or downsizing

California’s pro-ADU legislation combined with San Leandro’s zoning flexibility makes now an ideal time to build.

Frequently Asked Questions – ADUs in San Leandro

Q: How big can my ADU be in San Leandro?
A: Most ADUs can be up to 1,200 sq. ft., depending on lot size and zoning. We’ll help assess your property and design within the limits.

Q: Will I need additional parking for an ADU?
A: Not always. In many cases—such as being near public transit or converting a garage—parking requirements are waived.

Q: How long does it take to build an ADU?
A: Typically 6–10 months from initial planning to move-in ready, depending on the scope of work and permitting timeline.

Q: Can I rent out my ADU in San Leandro?
A: Yes. You can legally rent your ADU as a long-term residential unit, once it’s permitted and approved for occupancy.

Contact Royalty Builders – San Leandro’s Premier ADU Contractor

Ready to transform your property with a beautiful, fully permitted ADU in San Leandro? Let Royalty Builders guide you every step of the way—from vision to reality. We’re proud to serve San Leandro homeowners with honesty, quality, and professionalism.

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

More space. More value. Built with Royalty.