San Bruno is one of the most conveniently located cities on the Peninsula—just minutes from SFO, BART, and major tech hubs. That makes it an excellent location for building an Accessory Dwelling Unit (ADU) to increase living space, create passive income, or accommodate family. At Royalty Builders, we specialize in designing and building high-quality ADUs in San Bruno that add value, comfort, and flexibility to your property.

Whether you’re thinking about a detached backyard cottage, a garage conversion, or an attached in-law suite, our expert design + build team will guide you from start to finish.

Why Build an ADU in San Bruno?

As housing demand continues to rise in the Bay Area, adding an ADU in San Bruno offers homeowners a smart way to meet their family’s needs or generate rental income. With its walkable neighborhoods, access to transit, and diverse housing stock, San Bruno is a prime location for secondary units.

Here’s why San Bruno homeowners are building ADUs:

• Provide private living space for parents, in-laws, or adult children

• Create a long-term rental unit in a strong local market

• Add a home office, gym, or creative studio

• Increase your property’s value and long-term usability

• Enjoy additional income or plan for multigenerational living

With California’s ADU laws simplifying the process, building an ADU in San Bruno has never been easier.

Full-Service ADU Design + Build in San Bruno

At Royalty Builders, we manage your entire ADU project under one roof—eliminating the need to coordinate with separate designers, engineers, and contractors. We bring your vision to life while handling every detail with care and efficiency.

Our ADU process includes:

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

• Custom Design & Planning: Our design team creates tailored floorplans that blend functionality with style and meet city regulations.

• Permitting & Approvals: We handle the full permitting process with the City of San Bruno, saving you time and stress.

• Construction Management: Our licensed builders construct your ADU with high-quality materials and skilled workmanship.

• Final Walkthrough & Ongoing Support: We complete a full walkthrough and remain available for support even after the project is done.

From compact garage conversions to spacious detached units, we handle it all—efficiently and professionally.

Types of ADUs We Build in San Bruno

We offer a variety of ADU types to suit your needs and property:

• Detached ADUs: Backyard cottages or standalone units with full kitchens and bathrooms

• Attached ADUs: Additions connected to the main home with private entrances

• Garage Conversions: Convert your garage into a livable space with modern finishes

• Above-Garage Units: Maximize vertical space and add a private upper-level suite

• Junior ADUs (JADUs): Interior conversions within your existing home—great for affordability and efficiency

We help you choose the right design based on your lot size, goals, and budget.

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

ADU pricing in San Bruno depends on the size of the unit, the type of build, finishes, and site-specific conditions. On average:

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

• Attached ADU: $200,000 – $350,000

• Detached ADU: $250,000 – $400,000+

• Custom/Luxury Builds: $500,000 and up

Cost factors include:

• Design complexity and square footage

• Foundation and grading (especially on sloped lots)

• Utility upgrades (water, sewer, electric)

• Interior finish selections and appliances

• Permitting fees and impact fees

We provide a free consultation and detailed estimate so you can understand all the costs involved—upfront and with full transparency.

ADU Permit Process in San Bruno

The City of San Bruno has aligned with California’s ADU mandates, offering a streamlined approval process for compliant ADUs. Our team has experience working with the San Bruno Planning and Building Departments and will manage the full process for you.

What we handle:

• Zoning and setback review

• Architectural and construction plans

• Submitting permit applications

• Responding to plan check corrections

• Scheduling inspections and final approvals

With Royalty Builders, you get a stress-free permitting experience and faster project timelines.

Frequently Asked Questions – ADU Services in San Bruno

Q: Can I build an ADU on a small lot in San Bruno?
A: In many cases, yes. New laws allow ADUs on lots of all sizes. We’ll help determine what’s feasible for your property.

Q: What size ADU can I build in San Bruno?
A: Most lots allow ADUs up to 1,200 sq. ft., depending on zoning and layout. We’ll help you maximize space within local guidelines.

Q: Can I rent out my ADU?
A: Yes, ADUs can be rented as long-term housing units. Short-term rentals may be restricted—check with local ordinances.

Q: How long does the process take?
A: Most projects take 6–10 months from design to completion, depending on permits and construction complexity.

Q: Will I need extra parking for my ADU?
A: Often no. If your property is within half a mile of public transit, parking requirements may be waived.

Why Choose Royalty Builders for Your San Bruno ADU?

• 🏗 Experienced Bay Area ADU Specialists

• ✍️ Custom Design & Full-Service Build Team

• ✅ Smooth Permitting with San Bruno Officials

• 🛠 High-Quality Construction & Reliable Timelines

• 📐 Creative Solutions for Small or Sloped Lots

• 🌟 Dozens of Successful Projects Across the Peninsula

We’re committed to delivering a stress-free experience, beautiful results, and a unit that will serve your family or tenants for years to come.

Ready to Build an ADU in San Bruno?

Let’s turn your vision into a beautifully crafted ADU that adds value, space, and flexibility to your San Bruno property. Contact Royalty Builders today to schedule your free ADU consultation.

Call us today and schedule a free consultation.