Granny Flat Builders in Northern California
Add flexible, private living space with expert granny flat builders you can trust. We deliver high-quality granny flat construction built for real living.
4.9/5 rating from 56+ online reviews.
What Is a Granny Flat & Why Homeowners Love Them
A granny flat, also known as an ADU granny flat, is a fully functional, self-contained living space built on the same property as your main home. It’s perfect for aging parents, adult children, guests, or rental income.
Whether you’re exploring prefab granny flats, modular granny flat options, or fully custom built granny flats, Sidex helps you find the right fit. We design and build spaces that are comfortable, durable, and tailored to how you actually plan to use them.
Complete Granny Flat Construction Services
Custom Granny Flat Design
Every home (and every family) is different. As experienced granny flat builders, we design layouts that maximize space, privacy, and comfort. Whether it’s a compact studio or a larger one bedroom granny flat, we tailor every detail to your needs.
Ground-Up Granny Flat Construction
We handle full granny flat construction, from foundation to final finishes. Our team builds high-quality structures that meet code, integrate utilities seamlessly, and stand the test of time.
Prefab & Modular Granny Flats
Looking for faster timelines? We offer prefab and modular granny flat solutions. These options reduce construction time while still delivering durability and modern design.
Built with Precision, Designed for Real Living
Explore our projects to see how we build functional, durable, and visually seamless structures across Northern California.
How We Build Your Detached ADU
Consultation & Feasibility
We evaluate your property, zoning, and goals to determine what type of detached ADU makes the most sense for your space and budget.
Step 1
Design & Planning
Our team creates a custom design, including layout, materials, and utility planning. We also handle permit documentation and approvals.
Step 2
Construction
From foundation to final finishes, we manage the entire detached ADU construction process with a focus on quality, timelines, and clean execution.
Step 3
Final Walkthrough
We complete final inspections, ensure everything is code-compliant, and walk you through your new space so it’s ready for immediate use.
Step 4
Detached ADU Builders Across Northern California
We design and build detached ADUs for homeowners across key regions, serving over 57 locations.
The Bay Area
From San Francisco to San Jose and surrounding cities, we help homeowners create smart, space-efficient ADUs that increase property value and usability.
South Lake Tahoe
In mountain regions, we build detached ADU construction projects designed for weather durability, insulation, and year-round comfort.
Sacramento Region
Serving Sacramento, Roseville, and nearby areas, we deliver practical and cost-effective detached ADUs tailored to growing families and rental opportunities.
Detached ADU FAQs
What is a detached ADU?
A detached ADU is a separate residential unit built on the same property as your main home, fully independent with its own living facilities.
How is a detached ADU different from an attached ADU?
A detached dwelling stands alone, offering more privacy and flexibility compared to attached units that share a wall with the main home.
How long does detached ADU construction take?
Timelines vary, but most projects take a few months depending on design complexity, permits, and site conditions.
Can I rent out my detached ADU?
Yes. Many homeowners use detached ADUs as rental units for additional income, subject to local regulations.
Do I need permits for a detached ADU?
Yes. Every detached additional dwelling unit must meet local zoning and building requirements. We help manage this entire process.
