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Custom ADUs in El Dorado Hills, CA
Get a custom accessory dwelling unit in Aptos, designed for modern living, built to fit your property and lifestyle.
4.9/5 rating from 56+ online reviews.

Thoughtfully Designed ADUs in El Dorado Hills
At Sidex, we build high-quality ADUs that feel intentional from day one. Every project is planned around your property layout, architectural style, and long-term goals. Whether you want a detached backyard unit or a connected living addition, our team delivers practical spaces that look and feel like a natural extension of your home.
As experienced ADU contractors El Dorado Hills, we manage the full process including planning, permits, design coordination, and construction. From modern layouts to traditional California-inspired designs, we create living spaces that blend comfort, efficiency, and craftsmanship.
If you’re searching for trusted ADU builders El Dorado Hills, Sidex builds spaces designed for practical use.
Complete ADU Services in El Dorado Hills

Detached ADUs

Attached ADUs

Granny Flats

Backyard Cottages

In-Law Suites

Garage Conversions

Prefab ADUs
Complete ADU Services in El Dorado Hills

Detached ADUs

Attached ADUs

Granny Flats

Backyard Cottages

In-Law Suites

Garage Conversions

Prefab ADUs
Complete ADU Services in El Dorado Hills

In-Law
Suites

Garage Conversions

Prefab ADUs
Structural Excellence & Outdoor Integration in El Dorado Hills
See how we transform properties in El Dorado Hills and the Sacramento Region with precision, seamless integration, and thoughtfully designed outdoor living spaces.
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 About ADUs in El Dorado Hills
What is an ADU?
An ADU, or accessory dwelling unit, is a secondary residential space built on the same property as a primary home.
Can I build an ADU in El Dorado Hills?
Yes. Many homeowners in El Dorado Hills build ADUs for family housing, guest accommodations, home offices, or rental income.
Do you handle permits for ADU projects?
Yes. Our team assists with planning, permit coordination, design support, and construction management throughout the project.
What types of ADUs do you build?
We build detached ADUs, attached ADUs, garage conversions, prefab ADUs, granny flats, and backyard cottages.
Will an ADU increase my property value?
A professionally designed ADU can improve usability, flexibility, and long-term resale value for many California properties.
How long does ADU construction take?
Project timelines vary depending on size, permitting, and design complexity, but we provide a clear schedule before construction begins.




