Serving Northern California
Accessory Dwelling Units in the Bay Area for Smart, Engineered Living Spaces
Building an accessory dwelling unit in the Bay Area is one of the most effective ways to increase your property value and create flexible living space. Sidex provides the specialized expertise required for complex California building codes.
4.9/5 rating from 56+ online reviews.
Work With the Best ADU Builder in the Bay Area
Starting an ADU in the Bay Area 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, 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 San Francisco & Beyond
Detached Units & ADU Builder
We specialize in detached backyard cottages that offer complete privacy. As a premier ADU builder in the Bay Area, our detached units feature full kitchens, bathrooms, and living areas that match the aesthetic of your main home.
Junior ADUs & ADU Contractors
If you have an existing garage or basement, our ADU contractors can convert that underutilized space into a high-value Junior ADU. This is a popular option for homeowners looking for ADU construction without expanding their home’s footprint.
Custom Design-Build & ADU Companies
Unlike many ADU companies in the Bay Area that offer “cookie-cutter” pre-fab units, Sidex offers fully custom design-build services. This ensures your project reflects your style and maximizes the unique topography of your property.
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.
Trustindex verifies that the original source of the review is Google.
Elizabeth Neilsen2024-07-15We needed some deck repairs and had Sidex out to give us a bid and suggestions. Best choice ever. They spent time to evaluate necessary repairs and gave us estimates. Contracted for the work. Workers were great. Very efficient and tidy. So happy with the results. Thank you Sidex. ❤️Trustindex verifies that the original source of the review is Google.Sruthi gn2024-06-15Thank you Sidex for an excellent work. They built our 12x12 deck in one day. Such a great team. We enjoyed the work .Trustindex verifies that the original source of the review is Google.Joshua K2024-06-02I recently had my dock replaced by Sidex Siding and Decking, and we couldn't be happier with how it turned out! I reached out to Andrey, and he and his team did an amazing job from start to finish. They listened to our vision for the dock, sourced high-quality materials, and maintained excellent communication throughout the process. The entire project was completed within a week, and the workmanship is outstanding. We are thrilled with how it turned out and would highly recommend Sidex Siding and Decking to anyone. Thank you, Andrey and team, for your exceptional work!Trustindex verifies that the original source of the review is Google.Rand Martin2024-05-16Excellent and meticulous work.Trustindex verifies that the original source of the review is Google.Barry Cohen2024-05-14Andrey and his team repaired a fence for me recently and I could not be happier with the work. I know he went out of his way to keep on schedule to do that work on the day upon which we agreed even though it was inconvenient for him. The team arrived on time, did the work efficiently and I believe for a reasonable price. The end product, the repair, was excellent. I would use this company again.Trustindex verifies that the original source of the review is Google.Nicole2024-05-13I am ???? grateful for this wheelchair ramp. They worked so hard to get it done in one day, so I could take my brother to the doctor by myself without using medical transportation. This is the first company that heard my needs and made it happen. I recommend Andrey! They are gentle, kind, and professional. Outstanding!Trustindex verifies that the original source of the review is Google.Elisey Borisov2024-05-09Thank you Sidex. Great team, easy to work with. Customer service was outstanding, answered all of my questions quickly, made me feel comfortable throughout all stages of the process. Great job guys, with new windows and siding my house looks brand new!Trustindex verifies that the original source of the review is Google.Any Way Moving2024-05-09I recently had the pleasure of hiring Sidex for siding installation on my home, and I couldn't be more impressed with the results. From start to finish, the entire process was seamless and professional. Firstly, the team at Sidex demonstrated excellent communication skills, promptly addressing all my inquiries and concerns. They provided a detailed quote outlining the scope of work and timeline for completion, which was very helpful in setting expectations. When it came to the installation itself, the craftsmanship exhibited by the crew was outstanding. They worked diligently, paying close attention to detail to ensure a flawless finish. The siding not only looks beautiful but also feels sturdy and durable, providing added protection to my home. Moreover, the project was completed within the agreed-upon timeframe, without any delays or unexpected issues. The crew was respectful of my property, keeping the work area clean and tidy throughout the process. Overall, I am beyond satisfied with the quality of work delivered by Sidex. Their expertise, professionalism, and attention to detail have truly transformed the exterior of my home. I would highly recommend their services to anyone in need of siding installation or any other home improvement projects.Trustindex verifies that the original source of the review is Google.Ariel Hernandez2024-05-09Absolutely killed it! From our first interaction, and up to the final moments of the project they showed true professionalism and good quality work with a smile on their face! I couldn’t recommend a better company, thank you!Trustindex verifies that the original source of the review is Google.Angel Solis2024-05-09Trusted company. Whatever your needs maybe be, regarding siding and decking, be sure that you can you trust Sidex.
