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- Grass Valley ADUs
Custom ADU Builders in Grass Valley, CA
We build thoughtfully designed accessory dwelling units in Grass Valley. Perfect for family living, rental income, and flexible backyard space.
4.9/5 rating from 56+ online reviews.

ADU Construction Services in Grass Valley
Building an ADU in Grass Valley is one of the smartest ways to create more living space without leaving the neighborhood you already love. Sidex builds ADUs that feel connected to your property and the way you actually live.
We handle everything from planning and structural work to final construction details. Our team designs custom spaces that fit naturally into the landscape while meeting California requirements for accessory dwelling units in California and local property regulations.
Complete ADU Services in Grass Valley

Detached ADUs

Attached ADUs

Granny Flats

Backyard Cottages

In-Law Suites

Garage Conversions

Prefab ADUs
Complete ADU Services in Grass Valley

Detached ADUs

Attached ADUs

Granny Flats

Backyard Cottages

In-Law Suites

Garage Conversions

Prefab ADUs
Complete ADU Services in Grass Valley

In-Law
Suites

Garage Conversions

Prefab ADUs
Structural Excellence & Outdoor Integration in Grass Valley
See how we transform Grass Valley and Sacramento properties with precision construction, thoughtful site planning, and seamless outdoor integration.
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!
Frequently Asked Questions About ADUs in Grass Valley
What is an ADU?
An ADU, or accessory dwelling unit, is a secondary residential structure built on the same property as your primary home.
Do you build custom ADUs in Grass Valley, CA?
Yes. Sidex designs and builds fully customized ADUs in Grass Valley tailored to your property, goals, and lifestyle needs.
What types of ADUs do you offer?
We build detached ADUs, attached ADUs, granny flats, backyard cottages, garage conversions, and prefab ADUs.
Do you help with permits and planning?
Absolutely. Our team helps homeowners navigate local regulations, planning requirements, and construction approvals throughout the project.
Can an ADU increase property value?
A professionally built ADU can improve property flexibility, functionality, and long-term resale value.
How long does ADU construction usually take?
Timelines vary depending on design, permitting, and construction scope, but we provide a clear schedule before work begins.




