ADU Builder Fremont
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Fremont, 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 Fremont, 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 Fremont 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 Sunnyvale'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 Fremont
Below is an overview of ADU regulations in Fremont. If you need more details about how these guidelines apply to your property, contact us to get connected with an ADU expert.
Where ADUs Are Allowed
ADUs are typically permitted on residential properties, though exceptions may apply. Your property must have an existing or planned single-family home or a multi-family building, such as a duplex, triplex, or apartment complex. Reach out to us to determine whether your property qualifies for an ADU.
Minimum Lot Size
There are no minimum lot size restrictions—any property, regardless of its dimensions, may be eligible for an ADU.
Number of ADUs Allowed
Single-family homes can typically accommodate one or two ADUs. Multi-family properties may be eligible for multiple ADUs depending on the number of existing units and the type of ADU being 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 usually need at least one parking space unless an exemption applies. Reach out to us for expert advice on Fremont’s ADU parking regulations.
Featured Project
ADU Builder Fremont FAQs
How long does it take to build a backyard home in Fremont?
Most homeowners complete the process in 8 to 12 months, including time for design (1–2 months), city review and permitting (2–4 months), and construction (4–6 months). Properties in hillside areas or older neighborhoods may need more time due to added reviews or site conditions.
What does it cost to build a compact second unit?
Construction costs in Fremont typically range from $450 to $500 per square foot, depending on design complexity, materials, and labor. A 750 sq. ft. in-law suite may start around $340,000, while a larger, detached cottage can exceed $475,000. Other costs include permit fees, utility hookups, and possible site grading.
Can my new living space share utilities with the main house?
Yes. Most of these homes connect to existing water, sewer, and electrical systems. For rental setups, homeowners sometimes install separate meters. If your home is older, you may need to upgrade your electrical panel to handle the additional load.
Are there rebates for energy-efficient construction?
Yes. Fremont homeowners can access BayREN programs, solar incentives, and rebates for EV chargers, smart thermostats, and efficient appliances. All new units must follow California’s Title 24 energy code, and those under 750 sq. ft. are exempt from certain development impact fees.
Why are people adding secondary units in Fremont?
These smaller homes provide flexible living options for extended family, long-term guests, caregivers, or renters. In Fremont’s competitive housing market, they offer an affordable way to increase usable space or generate additional income—without changing the character of the neighborhood.
Is demand for backyard cottages increasing?
Yes, especially as more people look for multigenerational solutions, home offices, or rental opportunities. Fremont’s growing population and limited housing availability make these small-scale dwellings a smart, long-term investment.
What are some popular styles and layouts?
Homeowners often choose modern garden flats, converted garages, or traditional guest houses with open layouts, high ceilings, and energy-efficient features. Detached designs are popular for privacy, while garage conversions work well for faster builds.
Where can I find guidance on building one of these units?
The Fremont Planning Division offers detailed resources on its website, including zoning maps, permit checklists, and development standards. City staff are also available for pre-application meetings to discuss your property and project goals.
Do these smaller homes affect neighborhood feel?
Not significantly. Fremont’s regulations require that new dwellings meet setback, height, and privacy standards, so they fit in with surrounding homes. When designed well, these homes provide gentle density while maintaining the look and scale of the neighborhood.
Is additional parking required for the unit?
In many cases, no extra parking is needed, especially if the new space is within ½ mile of public transit or is part of a converted garage or existing structure. For other cases, one off-street parking space may be required, depending on location.
Service Areas
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