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9 Builders

California

ADU Builders, ADU Designers

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Website

https://9builders.com/

9 Builders is a Bay Area ADU contractor specializing in the design and construction of accessory dwelling units for homeowners throughout Santa Clara County and surrounding communities. The company provides full-service ADU solutions, helping property owners create functional secondary living spaces that support rental income, multigenerational living, guest accommodations, or private workspaces.

From detached backyard cottages and garage conversions to attached additions and interior conversions, 9 Builders manages every phase of the ADU process under one roof.

Full-Service ADU Construction

As an experienced accessory dwelling unit builder, 9 Builders handles multiple ADU project types tailored to different lot configurations and homeowner goals.

Their services include:

Detached ADUs

Standalone structures built separately from the primary residence, commonly used as rental units, guest homes, or independent living spaces.

Attached ADUs

Additions connected to the existing home while maintaining separate entrances and independent living functionality.

Garage Conversions

Transforming existing garages into fully livable units complete with kitchens, bathrooms, and living areas.

Interior Conversions

Converting basements, attics, or unused interior spaces into self-contained housing units.

Design, Permits, and Construction Management

One of the defining aspects of 9 Builders’ approach is their fully integrated design-build process. The company manages:

Custom architectural design
Permit submissions
City revisions and approvals
Construction management
Final inspections

Their team works closely with homeowners throughout the process while navigating local zoning requirements, setback regulations, and California building codes across cities such as San Jose, Los Gatos, and surrounding Bay Area communities.

Functional and Efficient ADU Design

9 Builders focuses on maximizing livability within smaller footprints through efficient layouts and smart space planning.

Design features may include:

Open-concept floor plans
Integrated living and dining areas
Built-in storage solutions
Modern or traditional exterior styles
Outdoor patios or decks where space allows

Each ADU is designed to complement the primary residence while meeting the homeowner’s specific functional and aesthetic goals.

Energy-Efficient Construction

The company incorporates eco-conscious building practices and energy-efficient features into many projects, including:

Energy-efficient windows
LED lighting systems
High-quality insulation
Solar panel options
California energy code compliance

Material selections and finishes are customized according to project scope and budget preferences.

Practical ADU Information for Bay Area Homeowners

Homeowners considering an ADU project in California often benefit from understanding a few important guidelines:

Detached ADUs in California may be built up to 1,200 square feet
Attached ADUs may be up to 50% of the existing home’s living area
Building permits are required for all ADU projects
ADUs may be used for long-term or short-term rental purposes depending on local regulations
Only the newly constructed ADU portion is reassessed for property taxes

9 Builders assists homeowners throughout these planning considerations while providing detailed project estimates designed to minimize unexpected costs or delays.

Serving the Bay Area

9 Builders serves homeowners across the Bay Area, tailoring each project to the specific municipal requirements, lot conditions, and homeowner objectives involved in the build.

Their local knowledge of Santa Clara County zoning standards and permitting processes helps streamline project coordination from initial planning through final construction.

Business Hours

Monday: 9:00AM - 5:00PM
Tuesday: 9:00AM - 5:00PM
Wednesday: 9:00AM - 5:00PM
Thursday: 9:00AM - 5:00PM
Friday: 9:00AM - 5:00PM
Saturday: CLOSED
Sunday: CLOSED

Service Area

San Jose
Saratoga
Los Gatos
Sunnyvale
Cupertino
Bay Area

YouTube

https://www.youtube.com/@9builders

San Jose, Santa Clara County, California, United States

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