Best ADU Builders in Sunnyvale CA
If you’re planning to build an ADU in Sunnyvale, We provide complete design-build services tailored to your property and goals.
Licensed & Insured ADU Builders in Sunnyvale, CA
As licensed and insured ADU builders in Sunnyvale, DevArt8 delivers code-compliant construction backed by professional project management and structural expertise. We handle permits, engineering, and inspections to ensure your accessory dwelling unit is built safely, legally, and to the highest quality standards.
Sunnyvale ADU Regulation Expertise
Deep understanding of local zoning codes, setback requirements, and Sunnyvale-specific ADU regulations
End-to-End Design & Construction
From initial concept through final inspections, we manage your entire ADU project
In-House Project Management
Dedicated coordination of all trades, timelines, and city approvals
Transparent Pricing & Timelines
Clear budgets with no hidden costs and realistic construction schedules
Quality Materials & Craftsmanship
High-quality construction that maximizes your ADU's value and longevity
Our ADU Construction Services in Sunnyvale
Detached ADUs
Stand alone private units
Attached ADUs
Connected in law units
Garage Conversion ADUs
Garage to living space
Junior ADUs (JADUs)
Compact in home units
Custom ADU Design & Planning
Custom design and layouts
Permitting & City Approvals
Full permit management
Sunnyvale ADU Design & Construction Projects
before
Existing Property / Garage / Yard Space
After
Completed ADU in San Jose
Before
Existing Property / Garage / Yard Space
After
Completed ADU in San Jose
What Sunnyvale Homeowners Say
ADU Builders Sunnyvale – Frequently Asked Questions
Are ADUs allowed on residential properties in Sunnyvale, CA?
Yes. Most single-family properties in Sunnyvale qualify for at least one ADU under California state law. However, lot size, zoning designation, setbacks, and utility access must be reviewed before approval.
How much does it cost to build an ADU in Sunnyvale?
The cost of building an ADU in Sunnyvale depends on size, design type (detached, attached, or garage conversion), site preparation, and interior finishes. Detached ADUs typically require a higher investment than garage conversions due to new foundations and infrastructure.
How long does ADU construction take in Sunnyvale?
The full process—including design, permitting, and construction—can take 8 to 14 months. Construction typically lasts 4 to 6 months once permits are approved, depending on project complexity.
Do ADUs require separate utility meters?
Not always. Many ADUs share utilities with the primary residence, though electrical panel upgrades or sewer capacity evaluations may be required to meet building codes.
What is the maximum size allowed for an ADU in Sunnyvale?
California law allows detached ADUs up to 800 square feet with streamlined approval in many situations. Larger sizes may be possible depending on lot size and zoning regulations.