ADU Builder Hayward
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Hayward, 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 Hayward, 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 Hayward 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 Hayward
Below is an overview of ADU regulations in Hayward. If you need more information on how these rules apply to your property, contact us to get connected with an ADU expert.
Where ADUs Are Allowed
ADUs are generally permitted on residentially zoned properties, though exceptions may apply. Your property must have an existing or proposed single-family home or a multi-family building, such as a duplex, triplex, or apartment complex. Reach out to us to determine if your property qualifies for an ADU.
Minimum Lot Size
There are no minimum lot size restrictions—any property, regardless of its size, may be eligible for an ADU.
Number of ADUs Allowed
Most single-family homes can 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 typically require at least one parking space unless an exemption applies. Reach out to us for expert guidance on Hayward’s ADU parking regulations.
Featured Project
How long does it take to build a small second unit in Hayward?
The full process typically takes 8 to 12 months, including 1–2 months for design, 2–4 months for city approvals, and 4–6 months for construction. If your property has grading issues or requires utility upgrades, that may add extra time.
What does it cost to add a backyard cottage?
On average, building a compact home in Hayward costs $450 to $500 per square foot. A 750 sq. ft. guest suite may start around $340,000, with larger layouts reaching $475,000+ depending on materials, finishes, and site conditions. Permit fees and utility hookups are additional.
Can I connect the new unit to the main house utilities?
Yes. Most homeowners choose to share water, sewer, and electrical lines with the main residence. If you’re planning to rent out the space, you may want to consider separate meters. Some older homes will also need electrical panel upgrades.
Are there incentives for energy-efficient features?
Yes. Hayward residents can benefit from BayREN energy rebates, solar panel programs, and EV charger incentives. All new units must meet California Title 24 energy codes, and compact dwellings under 750 sq. ft. are exempt from certain impact fees.
Why are homeowners adding these smaller homes?
Whether it’s for family, rental income, or added flexibility, building a secondary suite allows homeowners to make better use of their property. These units offer a practical housing solution in a city where space and affordability are ongoing challenges.
Is there a strong demand for these types of homes in Hayward?
Yes. With limited housing inventory and rising costs, more residents are building in-law suites, detached cottages, or converted garages to house aging parents, adult children, or long-term tenants.
What design trends are popular locally?
Many property owners choose modern layouts with open interiors, energy-efficient systems, and natural lighting. Detached units, garage conversions, and studio-style cottages are among the most common formats, especially on mid-sized lots.
Where can I find guidance on local rules and permits?
The City of Hayward’s Development Services Department provides tools like zoning info, permit checklists, and design standards on its website. City staff are available to help with site evaluations and early design questions.
Will building one of these units affect my neighborhood’s character?
Not significantly. Hayward has guidelines to ensure these homes meet height, privacy, and setback requirements, so they integrate well with existing homes. When thoughtfully designed, they help gently expand housing options while preserving the community’s feel.
Is extra parking required for the new unit?
In most cases, no additional parking is needed if the dwelling is within ½ mile of public transit, or part of a garage or basement conversion. Otherwise, one off-street space may be required based on lot configuration.
In most cases, no additional parking is needed if the dwelling is within ½ mile of public transit, or part of a garage or basement conversion. Otherwise, one off-street space may be required based on lot configuration.
Service Areas
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