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.
Types of ADU Services We Offer
ADUs can be attached, detached, or converted from existing structures such as garages.
Attached
Attached ADUs are newly built buildings that are attached to your main home to look like one building but with a separate entrance.
Detatched
Detatched ADUs are newly built, custom buildings that are completely separate, standalone backyard units for maximum privacy.
Conversion
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
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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.
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Boost Property Value
ADUs boost property value 20-50%, banks recognize them as separate income-producing units, making your home highly marketable.
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Generate Rental Income
Start making $2,500-$5,000/month renting out your ADU with apps like AirBNB, especially in Silicon Valley / Bay Area!
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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
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Estimate & Project Booking
We provide a FREE Estimate and secure your project spot once you’re ready to move forward.
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Design & Planning
Our expert design team creates a custom ADU layout that fits your property, lifestyle, and budget.
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Permits & Approvals
We handle all city permits, engineering, and state compliance requirements so you don’t have to.
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Construction & Build
Our licensed ADU contractors build your project with top-quality materials and clear communication every step of the way.
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Final Walkthrough & Delivery
We complete a full walkthrough to ensure every detail meets our standards and deliver your move-in-ready ADU.
Why Choose Sigura Construction
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

Ralph
Morgan Hill Remodel

Eagle Dr
Sunnyvale Home Remodel

Wayside
Portola Valley Renovation

Webster
Palo Alto Remodel

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.