ADU Builders in Orinda for Beautiful Living Spaces
Partner with experienced ADU builders in Orinda who guide your project from concept, design, and construction, creating a home addition that complements your lifestyle.
4.9/5 rating from 56+ online reviews.

Your Go-to ADU Builders in Orinda
Building an ADU in Orinda is an opportunity to create a space that works harder for your family, increases everyday flexibility, and adds lasting value to your home. Whether you’re planning a private studio, expanding your living area, or considering a garage to ADU conversion in Orinda, Sidex delivers solutions tailored to your property.
As a trusted ADU builder in Orinda, our team manages every stage of ADU construction, from site evaluation and engineering to permitting and final finishes. We build high-quality projects that blend naturally with existing homes while helping homeowners make informed decisions about costs and long-term investment.
Complete ADU Services in Orinda

Detached ADUs

Attached ADUs

Granny Flats

Backyard Cottages

In-Law Suites

Garage Conversions

Prefab ADUs
Complete ADU Services in Orinda

Detached ADUs

Attached ADUs

Granny Flats

Backyard Cottages

In-Law Suites

Garage Conversions

Prefab ADUs
Complete ADU Services in Orinda

In-Law
Suites

Garage Conversions

Prefab ADUs
Structural Excellence & Outdoor Integration in Orinda
Explore how Sidex enhances properties in Orinda and the Bay Area through precision structural work, careful site planning, and outdoor spaces that connect seamlessly with the finished home.
EXCELLENT Based on 38 reviews Posted on Google Tatyana PTrustindex verifies that the original source of the review is Google. Posted on Google Vivi BabenkoTrustindex verifies that the original source of the review is Google. My grandparents backyard deck had taken a beating over the years, especially from all the snow and rough weather. It was definitely time for some love, and Sidex really came through for! What stood out most was the crew and how they treated my grandparents like family and were genuinely so kind throughout the whole project. Really glad we chose them!Posted on Google Sara YarmolyukTrustindex verifies that the original source of the review is Google. Extremely helpful employees and truly have honest work and craftsmanship.Posted on Google Valya StepanovTrustindex verifies that the original source of the review is Google. I can’t say enough good things about Sidex Siding & Decking! From the first phone call to the final walkthrough, the entire experience was outstanding. The team was professional, punctual, and incredibly knowledgeable. They took the time to answer all of my questions, communicated clearly throughout the project, and paid close attention to every detail. The quality of their workmanship exceeded my expectations, and the finished deck looks absolutely amazing. They treated my home with respect, kept the work area clean, and completed everything on schedule. It’s rare to find a company that truly delivers on its promises, but Sidex Siding & Decking did exactly that. If you’re looking for a trustworthy, skilled, and reliable contractor, I highly recommend them. I couldn’t be happier with the results and will definitely use them again for future projects. Five stars all the way!Posted on Google Max GatsmanyukTrustindex verifies that the original source of the review is Google. Fast and professionalPosted on Google Vince CartersonTrustindex verifies that the original source of the review is Google. Andrey and Nate were very helpful, would work with Sidex again. I am glad everything went as smooth as they said it would.Posted on Google Sava VashchukTrustindex verifies that the original source of the review is Google. We recently hired SIDEX to completely replace the old, worn-out siding on our home and we could not be happier with the results. They gave us a highly competitive and transparent quote with no hidden fees.Posted on Google Rita SnizhkoTrustindex verifies that the original source of the review is Google. We couldn’t be happier with how our new deck turned out! From the very beginning, the whole process was so easy, and the Sidex Construction team was amazing to work with. They really listened to what we wanted and brought our vision to life exactly how we imagined it! Our outdoor space has completely transformed, and it’s now one of our favorite places to relax. It’s exactly what we had in mind for our home, and we honestly couldn’t have asked for a better result. We highly recommend Sidex Construction to anyone looking for quality work!Posted on Google Amanda KilgoreTrustindex verifies that the original source of the review is Google. Had a great experience working with Sidex. Nate was super helpful during the in-person site visit and took the time to explain everything clearly without making us feel rushed or pressured. Andrey was also very helpful with scheduling and keeping everything organized throughout the process. The whole team was professional, easy to work with, and communication was solid from start to finish. Really appreciated how smooth everything went. Would definitely recommend Sidex to anyone looking for quality work and good customer service.Posted on Google Marjorie SiemsenTrustindex verifies that the original source of the review is Google. Tim did a wonderful job fixing a leak on my skylight windows. Totally professional and very detailed in his work. I would definitely consider him for future work!
FAQs Regarding ADUs in Orinda
What is an ADU?
An accessory dwelling unit is a fully independent residential living space built on the same property as an existing home.
Why choose Sidex as your ADU builder in Orinda?
Our local team provides complete design-build services, transparent communication, and custom construction tailored to your property’s unique layout and goals.
Do you handle permits and planning?
Yes. As experienced ADU contractors in Orinda, we coordinate planning, permitting, engineering, and construction to simplify the entire process.
Can you convert my garage into an ADU?
Absolutely. We specialize in garage to ADU conversions in Orinda, that maximizes existing structures while meeting California’s building standards.
How much does an ADU cost in Orinda?
Every project is different. Factors such as size, design, utilities, and site conditions influence ADU costs in Orinda, and we’ll provide a detailed estimate after evaluating your property.
What types of ADUs do you build?
We design and construct detached ADUs, attached ADUs, backyard cottages, granny flats, prefab ADUs, and fully customized ADUs in Orinda.




