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Business Details
21 Years
experience
Your Trusted Home Building Partner in Berkeley
At Kobban Builders, we approach every project with a commitment to lasting quality, sustainable practices, and client satisfaction. With nearly three decades of experience in residential and commercial construction, we specialize in transforming homes through second story additions and Accessory Dwelling Units (ADUs), tailored to meet evolving family needs and property goals. Our process emphasizes transparent communication, detailed planning, and minimizing disruption, ensuring clients remain informed and involved throughout every phase. We prioritize craftsmanship, integrating eco-friendly materials and energy-efficient solutions as standard practice. Our team collaborates closely with architects, engineers, and trusted partners to deliver custom spaces that align with both vision and budget.

Backed by a California General Contractor license (#873229) and full insurance coverage, we provide peace of mind through professionalism and accountability. From restoring historic details in Craftsman homes to designing modern expansions, our work reflects a dedication to artistry and functionality. Clients consistently praise our ability to turn complex projects into seamless, even enjoyable experiences, with testimonials highlighting timely execution, competitive pricing, and exceptional attention to detail. We value long-term relationships, treating every jobwhether large or smallwith equal care and respect. Our goal is to create spaces that enhance how you live, work, and connect, while ensuring the process itself becomes a positive chapter in your home's story.
Services
Second Story Additions ADU Construction Home Remodeling Energy Retrofits Historic Restoration
Details
  • Year established: 2005
Highlights and features
  • We offer 30 years of combined construction experience with a CA licensed contractor.
  • Our team integrates earth-friendly materials and energy efficiency into every project.
  • We provide transparent communication with detailed project timelines and milestones.
  • We handle both large-scale additions and small maintenance requests with equal care.
  • Our work is backed by full insurance, bonding, and a proven track record of client satisfaction.
What people say
Smooth and even fun process True artistry in matching details Stunning finished product Reasonably priced and efficient Highly skilled and considerate workers
Services
Second Story Additions
We specialize in creating functional second story additions that maximize living space while maintaining structural integrity. Our process includes cost estimation, architectural collaboration, and timeline planning to ensure seamless execution. Clients benefit from customized designs that align with family growth and property value goals.
ADU Construction
Our ADU solutions provide flexible living spaces for rentals, family members, or home offices. We coordinate permits, financing, and expert teams to deliver cost-effective units that enhance property value. Projects incorporate energy-efficient designs and streamlined approval processes to accelerate completion.
People
Gabriel Kobban
Founder & Licensed General Contractor
With 30 years in construction and 20 years leading Kobban Builders, Gabriel specializes in residential additions, historic restoration, and sustainable building. He holds CA license #873229 and prioritizes client collaboration to achieve tailored results.
Questions
What types of projects does Kobban Builders specialize in?
We focus on second story additions, ADUs, home remodels, and energy-efficient retrofits tailored to Bay Area properties.
Can Kobban Builders handle both large and small projects?
Yes, we treat every job with equal care, from major expansions to minor maintenance requests.
How does Kobban Builders ensure project timelines are met?
We provide detailed timelines with milestones and maintain transparent communication to keep projects on schedule.
Are financing options available for ADU construction?
Yes, we connect clients with experienced lenders to explore construction financing and grant opportunities.
Is Kobban Builders licensed and insured?
We hold CA General Contractor license #873229 and maintain full insurance coverage for all projects.