ADU Construction in Antioch
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- Design custom ADUs for your Antioch property.
- Transform underutilized spaces like garages.
- Build detached backyard cottages for full privacy.
- Our team handles local permits and zoning.
- Get a two-story design to preserve your yard.
- Trust us for complete start-to-finish construction.
Why the Bay Area Chooses Gadi Construction
Our home remodeling project is finally complete (almost 2 year ordeal), but team at Gadi Construction made this navigation manageable.
First shout out to Millie Studnict(Project Manager) . If you've ever gone through a major home renovation, you'd have many questions, decisions, surprises, inspections, and frustration. Throughout the entire process, Millie was always there with an answer, a solution, or simply the patience to walk us through the next step.
What I appreciated most was that Millie genuinely cared. No matter how busy things got, she always returned calls, responded to emails, and kept us informed. There were plenty of times when we were unsure about something, and Millie never made us feel like we were asking too many questions.
The entire Gadi team was great to work with as well. The crews showed up when they said they would, treated our home with respect, and were always courteous and professional. It was clear that everyone took pride in their work.
After dealing with the stress of restoring our home following a fire, it was a huge relief to have a contractor we could trust. The project is now complete, the final inspection has passed, and we're very happy with the outcome.
Thank you, Millie and Lucie and everyone at Gadi Construction..
Our home remodeling project is finally complete (almost 2 year ordeal), but team at Gadi Construction made this navigation manageable.<br><br>First shout out to Millie Studnict(Project Manager) . If you've ever gone through a major home renovation, you'd have many questions, decisions, surprises, inspections, and frustration. Throughout the entire process, Millie was always there with an answer, a solution, or simply the patience to walk us through the next step.<br><br>What I appreciated most was that Millie genuinely cared. No matter how busy things got, she always returned calls, responded to emails, and kept us informed. There were plenty of times when we were unsure about something, and Millie never made us feel like we were asking too many questions.<br><br>The entire Gadi team was great to work with as well. The crews showed up when they said they would, treated our home with respect, and were always courteous and professional. It was clear that everyone took pride in their work.<br><br>After dealing with the stress of restoring our home following a fire, it was a huge relief to have a contractor we could trust. The project is now complete, the final inspection has passed, and we're very happy with the outcome.<br><br>Thank you, Millie, and thank you to everyone at Gadi Construction for helping us get our home back.
Our home remodeling project is finally complete (almost 2 year ordeal), but team at Gadi Construction made this navigation manageable.
First shout out to Millie Studnict(Project Manager) . If you've ever gone through a major home renovation, you'd have many questions, decisions, surprises, inspections, and frustration. Throughout the entire process, Millie was always there with an answer, a solution, or simply the patience to walk us through the next step.
What I appreciated most was that Millie genuinely cared. No matter how busy things got, she always returned calls, responded to emails, and kept us informed. There were plenty of times when we were unsure about something, and Millie never made us feel like we were asking too many questions.
The entire Gadi team was great to work with as well. The crews showed up when they said they would, treated our home with respect, and were always courteous and professional. It was clear that everyone took pride in their work.
After dealing with the stress of restoring our home following a fire, it was a huge relief to have a contractor we could trust. The project is now complete, the final inspection has passed, and we're very happy with the outcome.
Thank you, Millie, and thank you to everyone at Gadi Construction for helping us get our home back.
Had a great full bathroom remodel. Went very smoothly and our project manager, Itay, was always quick to respond and on top of things. He was very helpful and efficient. We are very pleased with the finished project and will definitely reach out to GADI for our next project.
I just wrapped a primary bathroom remodel with GADI.
Effie was a fantastic design partner – he understood our initial vision and worked with it to come up with something even better that we love.
Nadav did an amazing job managing the project. Communication throughout was constant & immediate via text, and we got the project done quickly and with minimal fuss. His team on the ground was also great across the board.
I'm hoping to work with Nadav & Effie on another project soon, and I highly recommend GADI!
I just wrapped a primary bathroom remodel with GADI.<br><br>Effie was a fantastic design partner – he understood our initial vision and worked with it to come up with something even better that we love.<br><br>Nadav did an amazing job managing the project. Communication throughout was constant & immediate via text, and we got the project done quickly and with minimal fuss. His team on the ground was also great across the board.<br><br>I'm hoping to work with Nadav & Effie on another project soon, and I highly recommend GADI!
I requested a quote for a job I need done and I had the pleasure of meeting Itay today. He was very professional and kind. Had good energy and reassured me that he will do everything he can for the best outcome. This is more of a review on Itay and I will update if I decide to hire them. But the initial process of getting a quote done was great because of Itay.
I recently hadflood damage to my home which requires extensive remodeling. I called a number of contractors And I was most impressed with Millie from Gadi construction.
Though we haven't gotten to the point of actual construction yet , Millie has come out and given me excellent guidance for remodeling bathrooms, kitchen, living area. I've never done remodeling before so it was nice to have somebody like Millie to
' hold my hand,' and take some of the stress off of making some major decisions. She has since returned phone calls promptly and feels more like a friend helping me rather than a person I hired or may hire.
Whether we use you or not in the end thank you Millie for helping me during this difficult time and I hope others see this review and can take advantage of your nice , kind personality and expertise.
Great experience with Gadi on my bathroom remodel. He hired experienced sub-contractors and made sure they showed up on time. Pricing is fair for the work done.
GADI had helped me in demolishing a big mirror wall and remodeling it into a dinning room. I couldn't be happier with the result. Esther and her crew were just amazing and made my dream came true. Great job!
Accessory Dwelling Units (ADUs) are a great way to expand your living space and add value to your home. At Gadi Construction, we specialize in designing and building functional, stylish, and efficient ADUs across Antioch, from homes near the Black Diamond Mines Regional Preserve to those by the Antioch Marina and the Antioch Historical Society Museum.
Whether you’re planning a rental unit, a private guest suite, or a comfortable home office, our team ensures every detail is tailored to your needs. We blend creativity and craftsmanship to deliver high-quality ADUs that enhance your property’s usability while complementing the charm of Antioch neighborhoods.
Our Kitchen Remodeling Process
We follow a seamless, structured process to ensure your kitchen remodel is smooth and stress-free from start to finish.
1
We begin by understanding your ideas, style preferences, and project goals to create a plan that aligns with your lifestyle.
2
Our experts design your kitchen in 3D so you can see exactly how the final space will look before construction begins.
3
We guide you in selecting high-quality materials from cabinets and lighting to flooring and countertops that complement Alameda’s architectural charm.
4
Our skilled craftsmen execute each stage with precision, care, and respect for your home.
5
Every detail is carefully inspected to ensure perfection, durability, and your complete satisfaction.
Innovative ADU Designs for Antioch Homes
Antioch’s warm suburban setting and growing housing demand make it ideal for adding an ADU to your property. At Gadi Construction, we create modern, space-smart designs that bring both comfort and long-term value. Each ADU project is built to reflect your lifestyle and fit perfectly with your existing home.
Here are six popular ADU design ideas among Antioch homeowners
A private living unit that sits separately from the main house perfect for guests, in-laws, or tenants. It offers independence and privacy while maintaining a welcoming home feel.
Seamlessly extends your current home to create extra living space or a home office. It’s an excellent choice for multi-generational families looking for close yet separate living areas.
Turn your unused garage into a functional and stylish mini-apartment.
This affordable option maximizes your property’s existing footprint with comfort and efficiency.
Ideal for smaller lots, this design adds vertical space while keeping your yard intact. It offers a smart way to expand without sacrificing outdoor area or natural light.
Transform your basement into a cozy, livable unit with its own entrance and amenities. A perfect solution for renters or family members seeking comfort and privacy.
Modern, open layouts with sleek finishes designed for single living or short-term rentals. These units bring elegance and profitability to your property with minimal space.
Comprehensive ADU Construction Services in Antioch
At Gadi Construction, we handle every phase of your ADU project from initial concept to completion. Our experienced builders ensure smooth communication, code compliance, and exceptional workmanship at every step.
Our full-service ADU solutions include:
- Custom ADU Design & Planning
- Permitting and Zoning Assistance
- Foundation, Framing & Roofing
- Plumbing, Electrical & HVAC Installation
- Interior Finishing & Fixtures
- Landscaping and Final Touches
We build ADUs that are not only beautiful but also durable, energy-efficient, and compliant with all Antioch building standards.
Want to get in touch?
We’d love to hear from you.
Here’s how you can reach us…
Tell us about your project and get a personalized, no-obligation quote.
We specialize in remodeling and construction – from kitchens to full home makeovers.
Let’s bring your vision to life with expert planning and transparent pricing.
OR CALL TODAY FOR A FREE ESTIMATE:
480-314-8016
Want to get in touch?
We’d love to hear from you.
Here’s how you can reach us…
Tell us about your project and get a personalized, no-obligation quote.
We specialize in remodeling and construction – from kitchens to full home makeovers.
Let’s bring your vision to life with expert planning and transparent pricing.
OR CALL TODAY FOR A FREE ESTIMATE:
480-314-8016
Start Your ADU Project in Antioch Today
Ready to make the most of your property? Contact Gadi Construction today to discuss your ADU vision. Our Antioch specialists will help you design and build a space that adds value, comfort, and versatility to your home. Call us now and let’s bring your dream ADU to life efficiently and beautifully.
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People Also Ask
The $40,000 grant in California for Accessory Dwelling Units (ADUs) is part of the state's CalHFA ADU Grant Program. This program provides up to $40,000 in pre-development and construction costs to help homeowners finance the creation of an ADU on their property. The funds can be used for expenses like architectural plans, permit fees, and site preparation. It is a forgivable loan, meaning you do not have to repay it if you meet specific requirements, such as completing the ADU and using it as a primary residence for a set period. For homeowners in the Santa Clara CA and San Jose CA area, this grant can significantly offset initial costs. For more tailored advice on incorporating an ADU into your property, Gadi Construction recommends reviewing our internal article titled Creating Multigenerational Living Spaces In Silicon Valley, which offers insights on designing flexible spaces that suit multigenerational living.
The cost to build a 1200 sq ft ADU in California varies significantly by region, but for the Santa Clara CA and San Jose CA area, you should expect a range. Generally, construction costs fall between $250 and $400 per square foot. For a 1200 sq ft unit, this means a total project cost of approximately $300,000 to $480,000. This estimate includes foundation, framing, utilities, and interior finishes, but does not always cover permits, design fees, or site preparation. For a more precise breakdown tailored to your specific lot and needs, we recommend reviewing our internal article titled 'Prefab Vs. Custom ADUs: Santa Clara Cost Analysis' at Prefab Vs. Custom ADUs: Santa Clara Cost Analysis. Gadi Construction advises that custom builds often offer better long-term value for larger units like this, as you can optimize for energy efficiency and local zoning requirements.
For homeowners seeking the most affordable Accessory Dwelling Unit, a prefabricated or modular ADU is typically the cheapest option. These units are built off-site in a controlled factory, which reduces labor costs and construction time compared to a custom stick-built addition. A standard prefab ADU can range from $80,000 to $150,000 for a basic 400 to 500 square foot unit, depending on finishes and site preparation. However, the absolute lowest-cost approach is often a conversion of existing space, such as turning a garage, basement, or bonus room into a living unit. This avoids the need for new foundations and major structural work. To ensure your project meets local requirements and stays within budget, we recommend reviewing our internal article titled 'Santa Clara County ADU Planning Permission: The Complete 2026 Guide to Permits, Costs, and Regulations' at Santa Clara County ADU Planning Permission: The Complete 2026 Guide to Permits, Costs, and Regulations for detailed cost breakdowns and permit guidance specific to the Santa Clara and San Jose area.