ADU Builder Los Altos
Custom, High-Quality Accessory Dwelling Units
Are you looking to build an Accessory Dwelling Unit (ADU) in Los Altos, 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 Los Altos, 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 Los Altos 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 Los Altos' 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 Los Altos
Below is an overview of Los Altos' ADU regulations. For more specific 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 have an existing or planned single-family home or a multi-family building, such as a duplex, triplex, or apartment complex. Contact us to verify whether your property qualifies for an ADU.
Minimum Lot Size
There are no minimum lot size restrictions—properties of any size may be eligible for an ADU.
Number of ADUs Allowed
Single-family homes can typically accommodate one or two ADUs, while multi-family properties may qualify for multiple ADUs depending on the number of existing units and the type of ADU being built. Get in touch with our team to determine how many ADUs your property can support.
Parking Requirements
Conversion and junior ADUs typically 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 Los Altos’ ADU parking regulations.
Featured Project
ADU Builder Los Altos FAQs
How long does it take to build a guest house or in-law suite in Los Altos?
Most homeowners can expect the process to take 9 to 14 months, including 1–2 months for design, 3–5 months for city review and permitting, and 4–6 months for construction. Additional time may be needed if your project involves hillside lots, heritage trees, or custom architectural plans.
What’s the typical cost to build a compact dwelling in Los Altos?
Building costs usually range from $500 to $550 per square foot, depending on site conditions, finishes, and layout. A 750 sq. ft. backyard cottage or granny flat might start around $400,000, with custom-built or larger units easily surpassing $600,000. Keep in mind that permit fees, utility adjustments, and landscaping can add to the total.
Can the new space share utilities with the main house?
Yes. Most secondary homes connect to the existing water, sewer, and electric systems. If you're planning to rent the space, or prefer independent usage tracking, separate meters can be installed. Electrical upgrades may be required for older homes.
Are energy efficiency or green building incentives available?
Absolutely. Residents can access BayREN energy rebates, along with programs for solar installations, EV charging stations, and high-efficiency appliances. All new homes must meet California Title 24 energy standards, and structures under 750 sq. ft. are typically exempt from local impact fees.
Why are homeowners in Los Altos adding backyard cottages or secondary suites?
These compact homes offer elegant solutions for extended family living, long-term guests, or rental income. They provide added flexibility for multi-generational households or those looking to create private, detached workspaces or care quarters.
Is there a growing trend toward these units in Los Altos?
Yes. With the city’s large lots and high housing costs, many residents are choosing to build garage conversions, garden suites, or detached guest houses to make better use of their property while preserving privacy and comfort.
What types of designs are common for small-scale homes?
Popular styles include mid-century modern, California ranch, and contemporary minimalist layouts. Many include open floor plans, natural light, energy-efficient systems, and outdoor living areas to complement the main residence.
Where can I get help with permits and planning requirements?
The City of Los Altos Planning Division provides clear guidance on zoning rules, setback requirements, and architectural standards. You can also schedule a pre-application consultation to review your property’s eligibility and start the process smoothly.
Will adding a secondary home change the neighborhood’s look?
No. Los Altos maintains strict design and development standards to ensure that new additions respect the scale, aesthetics, and landscaping of surrounding homes. These smaller homes allow for discreet expansion without altering the area’s residential charm.
Do I need to provide parking for the new living space?
In most cases, one off-street parking space is required. However, if your property is within ½ mile of public transit or you're converting an existing garage, you may be exempt from adding parking under state law.
Service Areas
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