ADU & Home Additions
Expand your living space or add a rental unit. We handle permits, design, and construction end-to-end.
ADU & Home Additions
Expand your living space or add a rental unit. We handle permits, design, and construction end-to-end.
Accessory Dwelling Units (ADUs) are one of the smartest investments you can make in the Bay Area. Whether you want a rental income unit, a guest suite, a home office, or multigenerational living space, Barcci Builders manages the entire process — from design and permitting through construction and final inspection. We've built dozens of ADUs across Silicon Valley and know exactly how to maximize your property's potential within local regulations.
What's Included
Every adu & home additions project by Barcci Builders includes these key elements.
Detached and attached ADU design
Garage conversions
Full kitchen and bathroom builds
Energy-efficient construction
City permit management
Architectural and structural engineering
Utility connections and separate metering
Interior design and finish selection
Our Process
A clear, structured approach that keeps your project on time and on budget.
Feasibility Assessment
We evaluate your property, zoning, and lot coverage to determine what's possible and what will deliver the best ROI.
Design & Engineering
Our architects create plans that maximize space, light, and livability while meeting all local building codes.
Permits & Approvals
We navigate the full permitting process — city planning, building department, and utility coordination.
Construction
Our experienced crew builds your ADU with the same quality standards as our luxury home remodels.
Inspection & Handover
We manage all inspections, obtain the certificate of occupancy, and walk you through your completed ADU.
Frequently Asked Questions
Common questions about adu & home additions with Barcci Builders.
ADU costs in the Bay Area typically range from $150,000 to $350,000+ depending on size, finishes, and site conditions. Garage conversions start around $100,000. We provide detailed cost breakdowns during your consultation.
From design to move-in, an ADU project typically takes 8-14 months. The permitting process usually takes 2-4 months, and construction takes 4-8 months depending on size and complexity.
Yes, ADUs require building permits. California's recent ADU laws (AB 68, SB 13) have streamlined the process significantly. Barcci Builders handles all permitting and knows the specific requirements for each Bay Area city.
Yes, ADUs in California can be rented as long-term rentals. Some cities also allow short-term rentals. ADUs in the Bay Area can generate $2,000-$4,000+ per month in rental income, making them an excellent investment.
In California, detached ADUs can be up to 1,200 sq ft. Attached ADUs can be up to 50% of the existing home's square footage. Junior ADUs (JADUs) can be up to 500 sq ft. We'll help you maximize your allowable size.
Ready to start your adu & home additions?
Book a free consultation — no pressure, just honest advice from the Bay Area's top-rated design-build team.
