
We provide professional ADU construction services for homeowners across San Jose and the San Francisco Bay Area. As a licensed California general contractor, we manage complete accessory dwelling unit projects — from feasibility analysis and design coordination to permits, construction, and final inspection. Whether you’re building a detached ADU, converting a garage, or adding a backyard unit, our team delivers code-compliant construction and reliable project timelines.
Our ADU construction services are designed to help homeowners add functional living space while maximizing property value. We handle both new ADU builds and garage conversions, managing all construction phases under one contract to ensure efficiency, compliance, and quality control.
Selecting the right ADU builder is critical due to zoning requirements, permit approvals, and structural considerations. As a licensed and insured California general contractor, we provide full project oversight, clear communication, and experience with Bay Area ADU regulations and approval processes.
Why homeowners choose us:
Licensed & insured California contractor
Experience with Bay Area residential properties
Permit and inspection coordination
Single point of responsibility for the entire project
EXCELLENT Based on 35 reviews Posted on Kathleen CatalanoTrustindex verifies that the original source of the review is Google. I needed my back patio door replaced. They were the first to contact me from a few Home Depot referrals and I could not be any happier with their service. Very impressed with the professionalism and craftsmanship. I would hire them again in a minute.Posted on Pamela KellyTrustindex verifies that the original source of the review is Google. Wonderful and very professional company and great customer service. Very responsive and kept to there promise of completion . I would highly recommend them .Posted on Matthew CheongTrustindex verifies that the original source of the review is Google. Worked with Cube construction twice already. Got faucets and shower head replaced. Nicely done! Recommended!Posted on Rita DalyTrustindex verifies that the original source of the review is Google. Max came to give me an estimate. He was easy to communicate with and his team did an excellent job.Posted on Kalyan NallaparajuTrustindex verifies that the original source of the review is Google. Top notch work!. Great experience. This will be my go to company going forward for any construction related work. Look no further.Posted on Parul AgarwalTrustindex verifies that the original source of the review is Google. I had a fantastic experience with Cube construction.The professional who came to install the window, glass did an excellent job. Not only was the work top-notch, but his communication was also clear and respectful. He made sure everything was done to perfection and in a timely manner. I highly recommend this company for anyone in need of quality installation servicesPosted on RachelTrustindex verifies that the original source of the review is Google. Very satisfied with the work by Cube Construction. Everything was done on time and as promised. The team was polite, always in touch, explained and showed every step. They worked clean, no mess, and left the site spotless. The estimate stayed the same no surprises. You can tell they know what they're doing. Thank you for the great result! I’ll definitely recommend them to friends.Posted on Sasha PetersonTrustindex verifies that the original source of the review is Google. Cube was outstanding! I found them as a referral from Home Depot so went in blind, and I could not have been more happy. Their prices were reasonable, communications top notch and they had so much pride in their work. The project ran a little late and I was leaving the next day and they stayed until the job was done! I can’t say enough positive things about Cube and can’t wait to work on another project with them!Posted on Rajni ShahTrustindex verifies that the original source of the review is Google. We found Cube construction co through a pro referral of Home Depot recommendation, decided to hire them. Adam and his team did an excellent job and exceeded our expectations with their professional work ethic. They paid attention to the minor details including excellent quality work. Project was done very efficiently in half the time, they stayed working late night until 11:30 pm to finish the job because next day was going to rain per weather forecast. We really appreciated their sincerity of commitment to the excellence of quality work. I would really heir him again for my future project. I would definitely recommend his Cube construction company to anyone who wants to work with them. Thank you again Adam 🙏 Mr. Shah 04/12/2025Posted on Sandeeep SinghTrustindex verifies that the original source of the review is Google. Awesome work done by Max and his team, we will definitely use this company again!!
We provide ADU construction services throughout San Jose, Santa Clara, and surrounding Bay Area cities. Our team is familiar with local zoning rules, ADU ordinances, and inspection requirements, allowing us to deliver compliant and efficient ADU projects across the region.
Do you handle ADU permits in San Jose?
Yes. We manage all required permits and inspections for ADU construction projects in San Jose and throughout the Bay Area.
Can you build both detached and garage conversion ADUs?
Yes. We specialize in detached ADUs, attached ADUs, and garage-to-ADU conversions.
Are you a licensed ADU contractor in California?
Yes. We are a CSLB-licensed and insured California general contractor authorized to perform ADU construction.
How long does an ADU project take?
ADU timelines vary based on design, permitting, and construction scope, but we provide clear schedules during the planning phase.
Contact us today for a free consultation and get expert guidance on your residential construction or remodeling project.
2998 Williams Rd, San Jose, CA 95123
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