Introduction

Are you thinking about adding an Accessory Dwelling Unit (ADU) to your Silicon Valley property? With housing demand at an all-time high and local zoning regulations evolving, ADUs—sometimes called backyard cottages, granny flats, or in-law suites—are more popular than ever. Whether you’re seeking extra space for family, rental income, or a home office, here’s what every Silicon Valley homeowner should know about building an ADU.

What Is an ADU? (ADU Meaning)

An ADU (Accessory Dwelling Unit) is a self-contained living space built on the same lot as a primary home. ADUs can be detached backyard ADUs, attached units, garage conversions, or even basement apartments. In California, ADUs are a flexible solution for adding value and functionality to your property.

Why Build an ADU in Silicon Valley?

1. Increase Property Value:
Modern ADUs are a major selling point, especially in competitive Bay Area neighborhoods.

2. Generate Rental Income:
Many homeowners use ADUs for rental income, helping offset mortgage costs or providing steady cash flow.

3. Support Multigenerational Living:
ADUs (or granny flats) create independent living spaces for family, guests, or caregivers.

4. Flexible Use:
From home offices to guest suites, ADUs adapt to your changing needs.

Popular Types of ADUs

Backyard ADU: A detached unit built in your yard for maximum privacy and flexibility.
Garage ADU: Converting a garage to an ADU is a cost-effective way to create new living space.
In-Law Suite: An attached or detached ADU designed for family members.
Home Office ADU: A quiet, dedicated workspace steps from your main home.

ADU Floor Plans & Design

The best ADU builders offer a range of ADU floor plans—from compact studios to spacious two-bedroom units. When planning your accessory dwelling unit design, consider:

Maximizing natural light and privacy
Smart storage solutions
Energy-efficient features
Modern, low-maintenance finishes

Custom ADU designs can be tailored to match your main house or stand out with unique architectural flair.

Navigating ADU Zoning Regulations in Silicon Valley

ADU zoning regulations can vary by city (San Jose, Palo Alto, Los Gatos, etc.), but California has made it easier than ever to build an ADU. Key points to consider:

Setbacks, height limits, and parking requirements
Permitting and inspection process
Lot size and coverage rules

Working with experienced ADU builders ensures your project complies with all local and state regulations.

ADU Cost & Financing Options

The cost of building an ADU depends on size, design, finishes, and site conditions. Transparent ADU builders will provide a detailed estimate, including:

Construction and materials
Permitting fees
Utility connections

Explore ADU financing options such as home equity loans, renovation loans, or local incentive programs to make your project more affordable.

Benefits of Building an ADU in California

Rental income potential
Increased resale value
Flexible living arrangements
Sustainable, energy-efficient construction

Why Choose EDR Design Build for Your ADU Project?

EDR Design Build is a trusted ADU builder serving Silicon Valley and the Bay Area. We offer custom ADU floor plans, expert accessory dwelling unit design, and end-to-end project management—from permits to move-in. Our team stays up-to-date on ADU California regulations and delivers projects on time and on budget.

Ready to explore your ADU options?
Contact EDR Design Build at (650) 888-2107 or [email protected] for a free consultation and discover how an ADU can add value, space, and flexibility to your Silicon Valley home.

Serving Silicon Valley and Beyond

We build ADUs in Los Gatos, San Jose, Saratoga, Campbell, Cupertino, Mountain View, Palo Alto, Los Altos, Los Altos Hills, San Carlos, Atherton, Hillsborough, Belmont, Pacifica, and throughout the Bay Area.