ADU Builder Gilroy
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Gilroy, CA?
Keep Your Family Close with a Custom ADU
Whether you want to create a comfortable space for aging parents, independent living for adult children, or a guest house for extended family, ADU Builders Group is your trusted ADU builder in Gilroy, California.
With over 20 years of experience, we specialize in designing and constructing high-quality, custom-built ADUs that strengthen family bonds, enhance multigenerational living, and improve your lifestyle while ensuring compliance with local building regulations.
Build with Peace of Mind
We are the only ADU company in Gilroy that offers a three (3) years project warranty on our services with complementary annual project inspection. All of this on top of the ten (10) years warranty on structural components.
✔ 3 Years Project Warranty
✔ Complimentary Annual Inspection
✔ 10 Years Structural Warranty
Why Choose Us?
1. Peace of Mind with Industry-Leading Warranties
✅ 3 Years Project Warranty – We stand by our craftsmanship, ensuring any issues within the first three years are addressed promptly and professionally.
✅ Free Annual Inspection – Our commitment to quality extends beyond project completion, we provide a free annual inspection, for the first three years after project completion, to ensure your ADU remains in excellent condition.
✅ 10 Years Structural Warranty – Our ADUs are built to last, and we back them with a decade-long structural warranty, giving you confidence in the longevity of your investment.
2. Expert Guidance & Hassle-Free Process
✅ Permitting & Compliance Experts – Navigating Gilroy's ADU regulations can be complex, but our experienced team ensures a smooth approval process, handling all paperwork and city requirements to prevent costly delays.
✅ 20+ Years of Construction Expertise – With decades of expertise in the construction industry and a dedicated focus on ADUs for over five years, we bring the knowledge, efficiency, and craftsmanship necessary to deliver high-quality results every time.
✅ Fast & Efficient Construction – Our streamlined process and skilled project management ensure your ADU is completed on time without unnecessary disruptions to your daily life.
3. Superior Craftsmanship & Custom Designs
✅ Aging-in-Place & Accessibility Features – Our ADUs are designed with the future in mind, incorporating accessibility features such as wider doorways, step-free entrances, and senior-friendly layouts for long-term convenience.
✅ Tailored Solutions for Every Home – Every family’s needs are unique, which is why we create custom ADU designs that maximize space efficiency, match your home’s aesthetics, and fit your lifestyle.
✅ High-Quality Materials & Precision Engineering – We use only top-tier materials sourced from our trusted, high-quality suppliers, ensuring that your ADU is durable, safe, and built to last for generations.
4. A Lifestyle Solution for Your Family's Needs
✅ Keep Loved Ones Close – Give elderly parents or adult children a private yet nearby living space, ensuring family members stay connected while maintaining their independence.
✅ Multigenerational Living Made Easy – Whether it's providing a comfortable home for aging parents or giving young adults a head start, our ADUs foster a supportive and practical living arrangement.
✅ Enhance Your Home’s Functionality – More than just extra space, an ADU can serve as a dedicated home office, personal gym, creative studio, or even a guest house for visiting relatives and friends.
About Us
Partners and Affiliations
ADU Builders Group Inc.
ADU Builders Group is a local, family-owned company dedicated to providing innovative solutions to California’s housing crisis, with passion for helping multigenerational families. Having high regards to family-oriented values, our work reflects a deep commitment to creating practical, high-quality custom ADUs that bring loved ones closer while respecting privacy and independence. With heart, craftsmanship, and a focus on community, we build homes that inspire and unite.
✔ Proudly Local
✔ Family-Owned
✔ Licensed and Insured
A Partner & Sister-Company of
Imagine Unique Remodels
Our Services and Expertise
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What's The Best Type of ADU for You?
Our Process
Consult with our ADU Experts
1
To start, discuss your needs, goals, and vision for your ADU with our experts. Start by having a phone consultation with us at (408) 413-3373. We'll set your schedule for the in-person meeting during the call. You'll receive expert recommendations and estimate for your ADU during the consultation phase at no cost.
2
Design with our Architect
Need to customize your ADU based on your needs and requirements? Design your own ADU and turn your ideas into an architectural plan with our Architect.
4
Construct & Pass Inspections
Our Project Managers will be in constant communication with you during construction and will ensure that your projects pass all inspections.
3
Obtain Permits Effortlessly
Our Liaison Officer will take care of the permits for you and work with the city to ensure that all paperworks are in place quickly and efficiently.
5
Enjoy and Maintain your ADU
Live the lifestyle you want and be worry-free. We'll continue to provide support and care to your project with our warranties and annual project inspection.
Local ADU Regulations in Gilroy
Below is an overview of Gilroy’s ADU regulations. If you need more details on how these rules apply to your property, reach out to us to connect with an ADU expert.
Where ADUs Are Allowed
ADUs are generally permitted on properties zoned for residential use, although some exceptions may apply. Your property must include an existing or planned single-family home or a multi-family building, such as a duplex, triplex, or apartment complex. Get in touch with our team to verify whether your property is eligible for an ADU.
Minimum Lot Size
There are no minimum lot size requirements—any property, regardless of its dimensions, may qualify for an ADU.
Number of ADUs Allowed
Single-family homes can typically have one or two ADUs, while multi-family properties may be eligible for multiple ADUs depending on the number of existing units and the type of ADU being constructed. Contact us today to find out how many ADUs your property can accommodate.
Parking Requirements
Conversion and junior ADUs generally do not require additional parking. However, attached and detached ADUs typically need at least one parking space unless an exemption applies. Reach out to us for expert guidance on ADU parking requirements in Gilroy.
Featured Project
ADU Builder Gilroy FAQs
How long does it take to build a secondary unit in Gilroy?
Adding a compact home usually takes 8 to 12 months, including 1–2 months for planning and design, 2–4 months for permit review, and 4–6 months for construction. Properties in rural areas or on larger lots may require longer utility reviews or septic system updates.
What’s the average cost to build a backyard cottage in Gilroy?
Construction costs typically range from $450 to $475 per square foot, depending on materials, layout, and location. A 750 sq. ft. in-law suite might cost around $340,000, while larger or fully detached homes may exceed $475,000. Don’t forget to factor in permit fees, utility upgrades, and site work.
Can the compact home connect to existing utilities?
Yes, most small secondary homes can share water, sewer, and electric systems with the main house. In rural parts of Gilroy, septic systems may need upgrading. If you plan to rent the unit, separate meters might be beneficial for utility tracking.
Are there incentives for energy efficiency or sustainability?
Yes. Gilroy homeowners can access BayREN rebates, along with incentives for solar panels, EV charging, and high-efficiency appliances. All new units must follow California’s Title 24 energy efficiency standards, and structures under 750 sq. ft. are typically exempt from city impact fees.
Why are more homeowners building in-law units or guest cottages?
These homes offer flexible space for extended family, long-term visitors, or renters, and they help property owners make better use of their land. Many residents use them to create multi-generational living arrangements or supplement their income.
Is there demand for secondary units in Gilroy?
Yes. As more families seek affordable housing options or rental income, small detached homes like granny flats and converted garages are becoming increasingly common—especially on Gilroy’s larger suburban and rural properties.
What designs are popular for compact dwellings?
Many residents favor modern farmhouse styles, rustic cottages, or garage conversions that reflect Gilroy’s blend of rural and suburban charm. Popular features include open layouts, energy-efficient systems, vaulted ceilings, and outdoor patios.
Where can I find guidance on zoning and permits?
The City of Gilroy Planning Division offers online resources, including zoning maps, design standards, and permit application checklists. You can also schedule a pre-application meeting to get help understanding your property’s development potential.
How do these additional homes affect neighborhoods?
Properly designed secondary homes maintain Gilroy’s suburban and rural character while adding needed housing options. The city ensures compliance with height limits, setbacks, and design guidelines to preserve neighborhood integrity.
Will I need to add extra parking?
Typically, one off-street parking space is required for a new unit unless it’s within ½ mile of public transit or part of a garage conversion. The city may offer exceptions based on location and project type.
Service Areas
Want to build your own ADU but don't know how to start?
Consult with Us Now
By requesting a callback using our form.