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
The GADI Team worked with us in multiple renovation projects. They quickly scoped and executed the project within the budget. Job well done!
Inon and his Team do a very good job at defining the work scope and quickly executing to get the work done. They handle all the permitting and the needed inspections as well. We leveraged the Team for multiple renovations. Job well done!
Beautiful job updating the kitchen and shower. Our project manager, Eden was responsive and quickly moved the project along, completing everything in three weeks .
GADI did a great job updating our kitchen and shower.
Our project manager Eden was highly responsive, quickly understood exactly what we needed, and kept everything moving efficiently. The entire project was completed in just 3 weeks. Updating the kitchen included installing a new counter, a new sink, and a built-in dishwasher, and everything is beautiful and working well. They also painted the cabinet doors, greatly improving the look of the kitchen. For the bathroom, they removed a built-in bench, making the shower much more spacious, and beautifully replaced with new tiles, including the floor.
We just completed a full primary bathroom remodel with Gadi constructions and we could not be happier with the result. The quality of the work was excellent, the project was well managed, and the finished bathroom turned out beautifully and almost exactly to the vision I had in mind.
I especially want to recognize Millie, our program manager, who was exceptional from start to finish. Her enthusiasm for her work is infectious, but what impressed me most was how personally invested she became in getting every detail right. She approached the project as though she were working on her own bathroom, not a client’s. She was constantly thinking ahead, finding creative solutions, making things work when challenges came up, and never settling for “good enough.”
I traveled quite a bit during the remodel, and knowing Millie was overseeing everything gave me tremendous peace of mind. She kept the project moving, handled issues without creating unnecessary stress for me, and always made me feel that the details were in very capable hands.
Remodeling can be disruptive and stressful, but having someone who genuinely cares about the outcome makes all the difference. Millie went above and beyond in every sense, and the entire team delivered a bathroom we absolutely love. I would highly recommend them.
We just completed a full primary bathroom remodel with Gadi constructions and we could not be happier with the result. The quality of the work was excellent, the project was well managed, and the finished bathroom turned out beautifully and almost exactly to the vision I had in mind.
I especially want to recognize Millie, our program manager, who was exceptional from start to finish. Her enthusiasm for her work is infectious, but what impressed me most was how personally invested she became in getting every detail right. She approached the project as though she were working on her own bathroom, not a client's. She was constantly thinking ahead, finding creative solutions, making things work when challenges came up, and never settling for "good enough."
I traveled quite a bit during the remodel, and knowing Millie was overseeing everything gave me tremendous peace of mind. She kept the project moving, handled issues without creating unnecessary stress for me, and always made me feel that the details were in very capable hands.
Remodeling can be disruptive and stressful, but having someone who genuinely cares about the outcome makes all the difference. Millie went above and beyond in every sense, and the entire team delivered a bathroom we absolutely love. I would highly recommend GADI constructions for your next remodel project.
Gadi Construction did an outstanding job upgrading our lower bedroom and powder room- they completed a patio project for me that I am extremely happy with . I recommend Gadi Construction for their professionalism and also their customer care experience – definitely would recommend them and use them again for any future projects.
Gadi construction handled the remodel of my 2 bathrooms: the main and secondary. My project manager Eden was the reason I chose them, she was responsive and listened to what I needed. She guided me through the process and helped me choose the right materials. They were not the lowest quote but I felt I was going to get my project done on a timely schedule and completed to my liking. And we are thrilled on how they came out! Thank you Eden!
Nadav & his crew are professional, punctual and reliable. They kept us informed about the process and the next steps, timelines etc throughout the process. They can anticipate hidden issues while renovating older structures, so it minimizes the surprises during the renovations.
We had a wonderful experience working with Gadi Construction on our home remodeling project. From start to finish, the team was professional, knowledgeable, and committed to delivering high-quality work. Remodeling a home can be stressful, but they made the entire process much smoother by communicating clearly, addressing our questions promptly, and ensuring every detail was handled with care.
A special thank you to our project manager, Millie, who was truly outstanding. She was organized, responsive, and incredibly easy to work with throughout the project. Millie kept us informed at every stage, coordinated everything seamlessly, and always made sure our concerns were addressed quickly. Her attention to detail, professionalism, and dedication gave us confidence that our project was in good hands.
The craftsmanship and quality of the finished work exceeded our expectations, and we are extremely happy with the transformation of our home. We appreciate the entire Gadi Construction team for their hard work and especially Millie for making what could have been a stressful renovation an enjoyable experience.
We highly recommend Gadi Construction to anyone looking for a reliable remodeling contractor, and if you're fortunate enough to have Millie managing your project, you'll be in excellent hands.
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.