San Jose ADU Contractor – Custom Designed Guest Homes

Add a custom-designed attached or detached guest house to your property for extended family, visiting guests, or additional rental income.

Sigura Construction: ADU & Garage Conversion Experts.

Sigura Construction makes building an ADU in San Jose simple and stress-free! As a San Jose ADU contractor, we are highly experienced with local code requirements and manage the entire process from start to finish. We take care of all permitting and coordination so you don’t have to.

When you work with us, we provide a white-glove experience, handling design, permits, construction, and every detail involved in building a new detached home or converting an existing space into a fully equipped, independent living unit with a kitchen and bathroom.

We have 20+ years in the construction industry, an A+ BBB rating, and Diamond Certified status for 19 years, we’re a trusted ADU construction company proudly serving San Jose and the greater San Mateo and Santa Clara county areas.

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Navigating San Jose ADU Rules: What You Need to Know in 2026

Inside a cozy ADU in Walnut Creek

San Jose is one of the most ADU-friendly cities in Santa Clara County, thanks to California's state housing laws and the city's own streamlined approval process. Whether it's a detached backyard cottage, garage conversion, or attached in-law suite, building an ADU in San Jose has become more achievable than ever.

Key Highlights:

  • No minimum lot size required for ADUs
  • Detached ADUs generally allowed up to 1,000 to 1,200 sq ft, depending on lot size and design track
  • 4 ft side and rear setbacks commonly permitted for qualifying ADUs
  • Detached ADUs typically allowed up to 16 to 18 ft in height depending on size and site conditions
  • Ministerial (by-right) approval for qualifying projects, no public hearings required
  • Garage conversions don't require replacement parking
  • Reduced impact fees for ADUs under 750 sq ft
  • EV readiness, Title 24 energy compliance, and updated California green building standards apply

We handle the entire process from zoning review and site measurements to custom design, permit plans, engineering coordination, and communication with San Jose Planning, Building and Code Enforcement to help keep your project moving efficiently.

With properly prepared plans, many homeowners are seeing faster approval timelines than ever before.

If you searched "ADU contractor near me" and are considering building a guest house for family, creating a private home office, or maximizing rental income potential in San Jose's competitive Silicon Valley housing market, whether you're in Willow Glen, Almaden Valley, Cambrian Park, or elsewhere in the city, you're in the right place. With 20+ years of experience, an A+ BBB rating, and Diamond Certified recognition for 19 years, we're proud to be a trusted ADU builder and garage conversion contractor serving San Jose and greater Santa Clara County.

Types of ADUs

Attached ADU

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Attached ADUs are newly constructed additions that connect to the primary home, designed to blend seamlessly with the existing structure while maintaining a private, separate entrance.

Detatched ADU

What is an ADU? ADU Icon 1

Detached ADUs are newly built, fully independent structures located in the backyard, designed to function as separate living units that offer maximum privacy.

ADU Conversion

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An ADU conversion that transforms an existing garage, attic, basement, or room into a separate living unit with its own entrance.

What are you planning?

We'd love to hear about it! Our team with over 20+ years experience in home additions and ADUs will team up with you to make your dreams come true.

The Benefits of an ADU in San Jose

  • Boost Property Value

    Want to boost your property value by 20-50%? They're recognized as potential for separate income-producing potential, which makes your home even more desirable.

  • Keep Family Close

    For guests, parents, in-laws or adult children who can't afford San Jose home prices that keep increasing. This is a great alternative.

  • Personal Workspace or Gym

    Since there's not owner occupancy requirements in San Jose, you can use your ADU as a studio, gym or any hobbies you're into!
  • AirBNB Rental Income

    Start making $2,500-$5,000/month renting out your ADU with apps like AirBNB, especially in Silicon Valley / Bay Area!

What Our Clients Say About Us!

Our Completed Projects Across the Bay Area

Morgan Hill New Home Remodel Virtual Tour

Ralph

Morgan Hill Remodel

Full custom home construction in Sunnyvale, Bay Area.

Eagle Dr

Sunnyvale Home Remodel

Beautiful kitchen remodel with wooden cabinets and island in San Jose.

Englewood

San Jose Home Addition

Incredible custom home built in Palo Alto.

Webster

Palo Alto Remodel

Bay Area modern kitchen with wooden cabinets and new flooring.

Frontenac

Sunnyvale Home Remodel

Need an ADU, Fast?

Sigura Construction is your trusted ADU contractor serving not just San Jose, but San Mateo, Santa Clara, and the greater Bay Area.