ADU Builders in San Jose, CA
From design to permits to construction, DevArt8 delivers fully compliant, high-quality accessory dwelling units for San Jose homeowners. Whether you’re adding rental income, housing family, or increasing property value, we manage every detail of your ADU project with expertise and care.
Why San Jose Homeowners Choose DevArt8 for ADU Construction
Building an ADU in San Jose requires navigating complex regulations, securing permits, and coordinating construction—all while ensuring compliance with California ADU laws.
San Jose ADU Regulation Expertise
Deep understanding of local zoning codes, setback requirements, and San Jose-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 San Jose
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
San Jose 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 Palo Alto Homeowners Say
Bathroom Remodeling FAQs – Palo Alto
How much does it cost to build an ADU in San Jose?
ADU construction costs in San Jose typically range from $150,000 to $400,000+ depending on the type of ADU, size, finishes, and site conditions. Garage conversions usually cost $100,000-$200,000, while detached ADUs range from $200,000-$400,000+. We provide detailed cost estimates during your free consultation.
How long does ADU construction take?
Most ADU projects in San Jose take 6-12 months from initial design to completion. The timeline includes design (1-2 months), permitting (2-4 months), and construction (4-6 months). Garage conversions are typically faster than ground-up detached ADUs. We provide a detailed project schedule at the start.
Do you handle permits and city approvals?
Yes, DevArt8 manages the entire permitting process for your San Jose ADU. We prepare all architectural plans, engineering documents, and permit applications, submit them to the City of San Jose, and coordinate all required inspections. Our expertise ensures smooth approvals and code compliance.
What types of ADUs are allowed in San Jose?
San Jose permits detached ADUs (separate structures), attached ADUs (connected to main house), garage conversion ADUs, and Junior ADUs (JADUs) within existing homes. Each type has specific requirements for size, setbacks, and parking. We’ll assess your property to determine which ADU type works best for your situation.
Can an ADU be used as a rental?
Yes, ADUs in San Jose can be rented long-term or used for short-term rentals (subject to local regulations). Many homeowners build ADUs specifically for rental income. ADUs must meet all building codes and safety requirements to be legally rented. We ensure your ADU is built to rental-ready standards.