Bay Area ADU Contractor – Custom Builds & Garage Conversions

Sigura Construction is your #1 Bay Area ADU contractor choice, specializing in custom ADUs, garage conversions, and home additions across San Mateo and Santa Clara counties. +24 years experience, A+ BBB, and Diamond Certified.

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Expert ADU Builders and Contractors in the Bay Area

Sigura Construction specializes in creating high-quality accessory dwelling units (ADUs) and garage conversions. With 24 years in the construction industry, an A+ BBB rating, and Diamond Certified status for 18 years, we're your trusted ADU construction company serving the San Mateo and Santa Clara counties. If you're looking for an ADU contractor / ADU builder to add flexible living space or in need of a garage conversion of an existing space, our team delivers exceptional results tailored to your needs.

 

What's an ADU?

An Accessory Dwelling Unit (ADU), is a secondary housing unit on residential property that provides its own independent living necessities with its own kitchen, bathroom, and sleeping area. They're often called "granny flats" or "in-law suites" and have become a popular solution to create space for family members, guests, or a great way to generate rental income using apps like AirBNB.

In California, especially throughout Silicon Valley, San Mateo, and Santa Clara counties, ADUs are becoming very popular as housing prices skyrocket, making it difficult for family members to find an affordable home in Silicon Valley.

💡Note: There’s a key difference between an ADU and a Room Addition or Home Addition. Additions expand your existing home by integrating a new space into the main structure, whereas an ADU, if attached, is closed off to the existing structure and has its own kitchen, bathroom, and living space.

If you searched "ADU contractor near me" and you're planning a space for family members in the Bay Area's competitive housing market or looking for maximize your rental income potential, you've come to the right place! With 24 years experience, A+ BBB rating, and Diamond Certified for 18 years, we're your premier ADU builder and garage conversion contractor serving San Mateo and Santa Clara counties.

We have two decades of experience in Residential and Commercial construction and especially with ADU's, we handle every step of the process, from design and permitting to state compliance, city inspections, and final walkthrough. All you have to do is sit back, we’ll take care of the rest.

Luxurious ADU in Atherton San Mateo

Types of ADU Services We Offer

ADUs can be attached, detached, or converted from existing structures such as garages.

Attached

What is an ADU? ADU Icon 2

Attached ADUs are newly built buildings that are attached to your main home to look like one building but with a separate entrance.

Detatched

What is an ADU? ADU Icon 1

Detatched ADUs are newly built, custom buildings that are completely separate, standalone backyard units for maximum privacy.

Conversion

What is an ADU? ADU Icon 3

ADU conversion is an existing garage, attic, basement or room that's converted into an ADU with a separate entrance.

Talk with an ADU Construction Expert

If you're exploring the idea of ADU construction or are simply looking for a room addition or home expansion and not an ADU, contact us today for more information.

The Benefits of Building an ADU

  • Affordable Family Housing

    Perfect for guests, parents, in-laws or adult children who cannot afford Silicon Valley's increasing housing prices. A great way to keep family and friends close.

  • Boost Property Value

    ADUs boost property value 20-50%, banks recognize them as separate income-producing units, making your home highly marketable.

  • Generate Rental Income

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

  • Personal Workspace or Gym

    Transform your ADU into a gym for yoga, a studio for music or art, a private office while future-proofing your property for living or rental opportunities.

Our Full Service ADU Process

  • Blueprint icon with house and worker.

    Estimate & Project Booking

    We provide a FREE Estimate and secure your project spot once you’re ready to move forward.

  • Blueprint with house sketch and pencil.

    Design & Planning

    Our expert design team creates a custom ADU layout that fits your property, lifestyle, and budget.

  • Document icon with a checkmark symbol.

    Permits & Approvals

    We handle all city permits, engineering, and state compliance requirements so you don’t have to.

  • Blue construction crane and building icon.

    Construction & Build

    Our licensed ADU contractors build your project with top-quality materials and clear communication every step of the way.

  • Icon of buildings and a house silhouette.

    Final Walkthrough & Delivery

    We complete a full walkthrough to ensure every detail meets our standards and deliver your move-in-ready ADU.

Inside a cozy ADU in Walnut Creek
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Why Choose Sigura Construction

  • Diamond Certified for 18 Consecutive Years.
  • Fully Licensed in CA: (#865155) & insured.
  • 24 years of Design & Build Expertise.
  • Prime Buyer's Certified, Houzz 5/5 Rated.
  • FREE Estimate & Design.

We are ready to transform your property into a multi-generational living space or a business where you generate passive income from renting out your ADU, contact us TODAY for a free estimate:

Our Completed Projects Across the Bay Area

Jaw-dropping full home construction in Morgan Hill, California. Sigura Construction's best work yet!

Ralph

Morgan Hill Remodel

Full custom home construction in Sunnyvale, Bay Area.

Eagle Dr

Sunnyvale Home Remodel

Wayside residence in Portola Valley, full home remodel.

Wayside

Portola Valley Renovation

Incredible custom home built in Palo Alto.

Webster

Palo Alto Remodel

Stunning custom home construction in San Mateo, designed and build by Sigura Construction.

Cedarwood

San Mateo Renovation

What Homeowners Say About Us

Need an ADU, Fast?

Sigura Construction is your trusted ADU contractor serving San Mateo, Santa Clara, and the greater Bay Area. Whether you’re planning a garage conversion, home addition, or a custom ADU build, we’ll bring your vision to life with precision and care.