ADU Construction in San Jose
- Home
- ADUs Construction
- San Jose
- Transform your unused garage into income.
- Design a detached backyard retreat for San Jose.
- Create an attached family extension with privacy.
- Convert your basement into a bright apartment.
- Build a compact home office for focus.
- Trust our team for full-service ADU construction.
In a city known for innovation and growth, your home should evolve too. Accessory Dwelling Units (ADUs) offer San Jose homeowners a modern way to expand living space, generate rental income, or create a cozy retreat for family and guests. At Gadi Construction, we specialize in designing and building ADUs that perfectly match your property’s style, space, and purpose.
Every project is guided by thoughtful planning, quality craftsmanship, and a commitment to turning unused areas into comfortable, high-value living spaces. Our goal is to make your ADU not just a structure but a seamless extension of your home that enhances your lifestyle and investment for years to come.
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 Design Ideas for San Jose Homes
San Jose’s balance of modern convenience and suburban comfort inspires homeowners to think creatively about ADU design. At Gadi Construction, we help you bring those ideas to life, crafting spaces that are functional, stylish, and built around your unique goals. Whether you need extra living space for family, a home office, or a rental unit, we’ll design an ADU that fits your lifestyle perfectly.
Here are six in-demand ADU styles among San Jose residents
A private and independent living unit that blends effortlessly into your backyard. It’s ideal for short-term guests, long-term tenants, or multi-generational families. With smart layouts and premium finishes, this ADU feels like a complete home of its own.
Perfect for homeowners who want to expand living space while maintaining a connected home layout. These units are attached directly to your main house yet designed to provide privacy and comfort. It’s an ideal setup for parents, adult children, or in-laws.
Transform your unused garage into a modern apartment, rental suite, or workspace. This design maximizes your existing footprint, offering a cost-effective way to add livable square footage without a major addition.
Convert your basement into a bright, livable apartment with modern lighting, ventilation, and elegant finishes. It’s a great option for guest housing or generating rental income while keeping your home’s layout efficient.
Tailored for professionals or creatives, this ADU provides peace and focus for remote work. Designed with comfort and productivity in mind, it can double as a guest suite or small rental space when needed.
For homeowners who love to host, this design offers a high-end private suite with premium materials and a warm, inviting atmosphere. It adds sophistication and long-term value to your property.
Full-Service ADU Planning and Construction in San Jose
At Gadi Construction, we manage every stage of your ADU project from design and permitting to final construction. Our process is simple, transparent, and customized to your needs. We make sure your new ADU follows all local codes while offering comfort, energy efficiency, and long-term durability.
Our team combines architectural skill with construction expertise to deliver results that exceed expectations and complement your home beautifully.
Our services include:
- Custom ADU Design & Space Planning
- Permit and Zoning Assistance
- Foundation & Framing
- Electrical & Plumbing Work
- Kitchenette and Bathroom Construction
- Cabinetry and Interior Finishing
Why the Bay Area Chooses Gadi Construction
I engaged GADI Constructions Inc to restore my unit in a high rise in San Jose. Right from the beginning Millie, Project Manager, was very professional and when entrusted with the job completed the repair and restoration work smoothly and in time with perfection with time to time progress reporting on phone and through video.
We explored a home addition for our growing family and these folks handled everything with a lot of thought. The builders explained the remodel plan clearly and made the space blend into the house naturally. It was a solid experience all around.
We recently engaged Gadi Construction for a home renovation project, and the experience exceeded our expectations. Their team demonstrated exceptional flexibility, efficiency, and accommodation, adapting seamlessly to our evolving needs while maintaining a high standard of workmanship. The quality of the final output was impressive, reflecting meticulous attention to detail. Millie, our dedicated project manager, along with her team including Mike, fostered a reassuring and collaborative environment throughout the process, ensuring clear communication and minimal disruption. We highly recommend Gadi Construction for any renovation endeavors; their professionalism and commitment to client satisfaction are commendable.
We recently engaged Gadi Construction for a home renovation project, and the experience exceeded our expectations. Their team demonstrated exceptional flexibility, efficiency, and accommodation, adapting seamlessly to our evolving needs while maintaining a high standard of workmanship. The quality of the final output was impressive, reflecting meticulous attention to detail. Millie, our dedicated project manager, along with her team including Mike, fostered a reassuring and collaborative environment throughout the process, ensuring clear communication and minimal disruption. We highly recommend Gadi Construction for any renovation endeavors; their professionalism and commitment to client satisfaction are commendable.
We worked with Nadav from Gadi Construction during the planning phase of our expansion project, and he was a fantastic advisor throughout the process. He helped us think through every detail — from design implications to quality considerations — and brought a thoughtful, thorough, and methodical approach to each discussion.
Nadav was always friendly, highly professional, and incredibly responsive. It consistently felt like he was acting as a truly independent advisor who cared deeply about building long-term relationships and making sure we would get the very best outcome for our project. His proposals were detailed, insightful, and clearly grounded in deep experience.
Although we ultimately moved forward with another contractor who came through a personal referral, that decision wasn’t a reflection on Nadav’s work or professionalism. Based on our experience, we’d be thrilled to work with him in the future and wholeheartedly recommend him to anyone looking for a trusted, high-quality construction partner.
I went with them for a kitchen makeover and it was worth every penny. The design team helped me see options I never thought about.
Their skilled builders were respectful of the house and kept everything tidy. It felt like a real partnership through the whole remodel.
The value added by the new layout is already noticeable. I still walk in and smile because the remodel turned out exactly right.
Taking on a whole house renovation sounded stressful but they took the edge off. They walked us through each stage of the project so we always knew what was happening. The result feels like a true custom home remodeling job.
The bathroom remodel completely changed how our space feels. Their team helped plan everything so the design made sense and looked great. The quality build is obvious in every corner. It’s nice to have a space that’s functional and adds value at the same time.
We worked with this business for a full residential remodel, and it was a great experience. The skilled builders brought the design to life exactly as we imagined. Every room feels intentional and high-quality. I’d happily recommend them to anyone looking for a thoughtful and professional remodel.
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:
SAN JOSE AREA – 404-889-1000
SAN FRANCISCO AREA – (925) 639-3177
Our Services
Home Remodel
Bring new life to your home with expert remodeling that combines style, comfort, and functionality. Upgrade your home from floor to ceiling with a custom remodel tailored to your needs and lifestyle.
Common Area Remodel
Kitchens are the centerpieces of your home; they’ve become the center of most modern homes, a place where family comes together to share tastes, love, and stories.
Kitchen Remodel
Kitchens are the centerpieces of your home; they’ve become the center of most modern homes, a place where family comes together to share tastes, love, and stories.
Bathroom Remodel
One of the most common remodeling projects for homeowners is to remodel the bathrooms in the house. After all, this is probably the first place you visit in the morning and the last place you visit at the end of the day.
Additions
Anyone can use an extra room in their home. It could be a space for business, like an Airbnb unit, daycare (yes, we’ve seen that happen) if you would like it or need an additional guest room or bedroom.
ADUs
Maximize your property’s potential with a custom-built ADU. Whether it’s for rental income, a home office, or additional living space, our team designs and builds functional, stylish units that blend seamlessly with your property.
Basement Remodel
Transform your basement into a beautiful, functional living space, a cozy retreat, home office, or guest suite with expert remodeling your family will love.
Start Your ADU Project in San Jose Today
Make the most of your property with a professionally designed ADU from Gadi Construction. From creative design ideas to precise construction, we handle it all with care and expertise. Call us today to book a free consultation and see how we can help you create a beautiful, functional ADU that enhances your San Jose home and lifestyle.
Related Projects
People Also Ask
The cost to build an Accessory Dwelling Unit (ADU) in San Jose typically ranges from $200,000 to $500,000 or more. This wide variation depends heavily on size, design complexity, site conditions, and material choices. A basic, prefabricated junior ADU might start near the lower end, while a custom-built, two-bedroom detached unit with high-end finishes often reaches the upper range. Key cost drivers include city permit fees, utility connection charges, foundation work, and complying with California's stringent building codes. Given San Jose's high construction costs, obtaining multiple detailed quotes from licensed contractors experienced with local ADU regulations is crucial for accurate budgeting and project planning.
The $40,000 grant in California typically refers to the CalHFA ADU Grant Program. This initiative provides forgivable loans of up to $40,000 to qualified homeowners to cover pre-development costs associated with building an Accessory Dwelling Unit (ADU) or Junior ADU (JADU). Eligible costs include impact fees, planning, design, soil tests, and permit applications. The loan is forgiven if the homeowner completes the ADU and occupies either the primary residence or the ADU for five years. This program aims to increase affordable housing stock and help homeowners offset high upfront costs. It is crucial to check current program guidelines through the California Housing Finance Agency or local partners, as funding availability and specific terms can change.
The cost comparison between building an Accessory Dwelling Unit (ADU) on-site versus purchasing a prefabricated model depends heavily on project specifics. Generally, prefab ADUs can be cheaper upfront due to controlled factory construction reducing labor time and material waste. However, site-built ADUs might offer lower long-term costs if using simpler designs and local materials, but they face higher labor expenses and potential delays. Key factors include local permit fees, site preparation costs (like foundation and utility connections), and customization level. Prefab often has a faster timeline, while custom builds allow more design flexibility. A detailed budget analysis, including all site work and permits, is essential for an accurate comparison.
The cost to build a 500 sq ft Accessory Dwelling Unit (ADU) in California varies widely, but current industry averages typically range from $150,000 to $300,000. This translates to a rough cost per square foot of $300 to $600. The final price is highly dependent on location, site conditions, design complexity, and material choices. A basic, prefabricated unit on favorable land will be at the lower end, while a custom-designed ADU in a high-cost urban area with challenging site work or high-end finishes can reach or exceed the upper estimate. Key cost drivers include permits and impact fees (which vary by city), foundation work, utility connections, and interior finishes. Securing multiple detailed bids from licensed contractors is essential for accurate budgeting.
The cost of ADU construction in San Jose varies widely based on size, design, and site conditions. On average, expect to invest between $200,000 and $400,000 for a complete project. Key cost factors include foundation work, materials, labor, permits, and utility connections. San Jose's specific building codes and permit fees add to the expense. Prefabricated or modular ADUs can sometimes reduce costs. It is crucial to obtain multiple detailed quotes from licensed contractors familiar with local regulations. Proper budgeting should also account for potential site preparation challenges like grading or drainage. Investing in energy-efficient features can offer long-term savings despite higher initial costs.
Building an Accessory Dwelling Unit (ADU) in San Jose requires navigating specific local regulations alongside California state law. The city has streamlined the process to address housing needs, but key requirements remain. Your ADU must comply with San Jose's zoning, which generally permits ADUs on single-family and multi-family lots. There are strict rules on size, height, setbacks, and parking, with some exemptions. A Junior ADU (JADU) is also an option, converted from existing home space. The permit process involves planning and building department approvals. Given the complexity, consulting with a professional design-build firm like Gadi Construction is crucial to ensure your project meets all codes, maximizes your property's potential, and is completed efficiently.
