Serving Northern California
Accessory Dwelling Units in the Bay Area & Beyond
Sidex provides the specialized expertise required for complex California building codes.
4.9/5 rating from 56+ online reviews.
Top ADU Builders in Northern California
Starting an ADU requires more than just a general contractor; it requires a team that understands the nuances of local zoning and structural engineering. As experienced ADU builders in the San Francisco Bay Area & beyond, we manage the entire lifecycle of your project—from the initial feasibility study to the final interior finishes.
When you choose Sidex for your ADU construction, you are partnering with one of the best ADU companies in the Bay Area. We bridge the gap between architectural design and efficient construction, ensuring your ADU is delivered on time and within budget.
Professional ADU Construction in the Bay Area & Beyond
Detached ADUs
Attached ADUs
Granny Flats
Backyard Cottages
In-Law Suites
Garage Conversions
Prefab ADUs
Professional ADU Construction in the Bay Area & Beyond
Detached ADUs
Attached ADUs
Granny Flats
Backyard Cottages
In-Law Suites
Garage Conversions
Prefab ADUs
Professional ADU Construction in the Bay Area & Beyond
Detached
ADUs
Attached
ADUs
Granny
Flats
Backyard Cottages
In-Law
Suites
Garage Conversions
Prefab ADUs
Recent Northern California Projects
We’ve revamped homes across Sacramento, remodeled exteriors in the Bay Area, and upgraded mountain houses near Lake Tahoe.
Why Sidex is the Preferred ADU Contractor
Expert ADU Builders
Our reputation as ADU builders in the Bay Area is built on our ability to navigate dense urban lots. We handle the logistical challenges of ADU construction, providing a seamless experience from permit to paint.
Expertise
Full-Service ADU Companies
As one of the most trusted ADU companies, we provide in-house crews for plumbing, electrical, and finishing. This allows us to maintain a higher standard of quality than other ADU contractors in the Bay Area who rely solely on subcontractors.
Services
Areas We Serve
We’re proud to offer accessory dwelling unit services to over 57 locations across Northern California.
The Bay Area
As an ADU contractor, we serve the entire region from San Jose to Marin. We are the ADU contractors in the Bay Area that homeowners trust for complex, high-end additions.
South Lake Tahoe
We bring our “Mountain-Modern” expertise to Tahoe, building ADUs that serve as perfect ski-season rentals or multi-generational family guest suites.
Sacramento Region
In the greater Sacramento area, we help homeowners take advantage of larger lots by building spacious detached ADUs that provide significant rental income or home office space.
