ADU Builder Cupertino
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Cupertino, 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 Cupertino, 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 Cupertino 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 Cupertino’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 Cupertino
Below is an overview of Cupertino’s ADU regulations. For details on how these guidelines apply to your property, reach out to us to connect with an ADU expert.
Where ADUs Are Allowed
ADUs are generally permitted on properties designated for residential use, but there may be exceptions. Your property must have an existing or planned single-family home or a multi-family building, such as a duplex, triplex, or apartment complex. Contact us to determine if your property qualifies for an ADU.
Minimum Lot Size
There are no minimum lot size restrictions—any property, regardless of size, may be eligible for an ADU.
Number of ADUs Allowed
Single-family properties can typically add one or two ADUs. Multi-family properties may allow multiple ADUs, depending on the number of existing units and the type of ADU constructed. Get in touch with our team to find out how many ADUs your property can support.
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 Cupertino’s ADU parking regulations.
Featured Project
ADU Builder Cupertino FAQs
How long does it take to build a backyard home in Cupertino?
Most projects take 8 to 12 months from start to finish. This includes 1–2 months for design, 2–4 months for city permitting, and 4–6 months for construction. Properties in hillside areas or with unique site conditions may require more time for approval and preparation.
What’s the average cost to build a compact unit in Cupertino?
Construction costs typically range from $450 to $500 per square foot, depending on design, materials, and site complexity. A 750 sq. ft. guest cottage or in-law suite may start around $340,000, while larger or custom-designed homes can exceed $475,000. Additional costs include permits, utility work, and possible upgrades to the main structure.
Can my new unit connect to existing utilities?
Yes. Most small secondary homes share water, sewer, and electrical service with the main residence. If the space will be rented or metered separately, installing dedicated utility connections may be required. Older properties may also need electrical panel upgrades.
Are there incentives for building energy-efficient housing?
Yes. Cupertino homeowners can access BayREN rebates, solar energy programs, and incentives for EV charging stations and efficient appliances. All new builds must comply with California’s Title 24 energy standards, and units under 750 sq. ft. are generally exempt from impact fees.
Why are more people adding in-law units or backyard cottages?
These smaller homes are ideal for extended family, adult children, live-in caregivers, or renters. They offer a flexible, cost-effective way to expand your living space or generate additional income—without moving or building a full addition.
Is there a growing demand for these types of homes in Cupertino?
Yes. With limited housing options and high living costs, many residents are exploring garage conversions, detached garden flats, and compact studio units to create more functional space on their property.
What design styles are popular in Cupertino?
Common layouts include modern minimalist studios, Craftsman-style cottages, and converted garages with open floor plans. Energy efficiency, natural light, and privacy are key features, along with smart technology and low-maintenance landscaping.
Where can I get guidance on local permits and zoning?
The City of Cupertino’s Community Development Department provides online resources including zoning maps, permit guidelines, and design standards. Staff are also available to assist with pre-application consultations to review your property’s eligibility.
Will a compact home affect my neighborhood’s look?
Not significantly. Cupertino enforces clear rules for height, setbacks, privacy, and exterior design to ensure that secondary dwellings complement the main home and surrounding properties. These units add gentle density while preserving neighborhood character.
Is extra parking required for a small secondary suite?
In most cases, no additional parking is required if the space is within ½ mile of public transit or part of a converted structure. Otherwise, you may need to provide one off-street parking space depending on the design and lot configuration.
Service Areas
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