Accessory Dwelling Units

Customizable ADU Solutions for Every Home In Sunnyvale, Los Altos & Palo Alto, CA

Explore our range of fully customizable Accessory Dwelling Units (ADUs), designed to complement any home style, including modern, contemporary, standard, and ranch designs. Whether you’re looking to maximize your living space, generate rental income, or create a private retreat for family members, our ADU solutions are built to meet your needs while adhering to California’s ADU regulations.

Our experienced ADU contractors understand the local building codes and zoning laws, ensuring that your ADU is compliant and seamlessly integrated into your property. We provide end-to-end services, from design consultation to construction, making the process hassle-free and efficient. Choose Eco Scale Construction now by calling us for a free quote!

Our ADU Services In Sunnyvale, Los Altos & Palo Alto, CA

Garage Conversion ADU

Transform your existing garage into a fully functional living space without the need for additional land or major construction. Garage conversions are one of the most cost-effective and time-efficient ways to build an ADU, providing an excellent option for rental income, home offices, or multi-generational living. With our expertise, we ensure that your garage ADU is optimized for comfort, energy efficiency, and privacy.


Attached ADU

Expand your home’s footprint with an attached ADU, seamlessly connected to your existing structure. This option is perfect for homeowners who want to increase their living space while maintaining easy access between the main home and the new unit. Whether you need an in-law suite, guest quarters, or a rental space, an attached ADU offers flexibility and convenience without the need for major structural modifications.


Detached ADU

For those seeking complete independence and privacy, a detached ADU is the ideal solution. A stand-alone unit separate from the main house, a detached ADU provides a self-contained living space equipped with all the necessary amenities. Whether you’re housing aging parents, accommodating guests, or creating a rental opportunity, a detached ADU enhances your property’s functionality and value.

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Why Choose Our ADU Contractors In Sunnyvale, Los Altos & Palo Alto, CA

Maximize the potential of your property with a beautifully designed ADU tailored to your needs.

  • Expertise in Local ADU Regulations: Our team is well-versed in California’s ADU laws, ensuring compliance and seamless permitting.
  • Custom Designs to Suit Your Lifestyle: Choose from modern, contemporary, standard, and ranch-style ADUs.
  • High-Quality Construction & Materials: We prioritize durability, efficiency, and aesthetic appeal in every ADU project.
  • End-to-End Project Management:From design and permitting to construction and final inspection, we handle it all.

Contact us today to schedule a consultation and start your ADU project!

California ADU Regulations & Maximum Sizes

Understanding California’s ADU laws is essential when planning your project. Our team ensures compliance with the latest state and local regulations, including size limitations and zoning requirements.


  • Maximum Size: California law allows ADUs up to 1,200 square feet, but local ordinances may impose additional restrictions.
  • Junior ADUs (JADUs): A JADU is a smaller unit, typically within the existing home, and is limited to 500 square feet.
  • Setback Requirements: Detached ADUs generally require at least a 4-foot rear and side setback.
  • Height Restrictions: ADU height limits vary by jurisdiction but typically range from 16 to 25 feet.
  • Parking Requirements: In many cases, parking is not required if the ADU is within a half-mile of public transit.

When you choose us for the job, we work quickly and efficiently to offer reliable siding repair services. We’ll return your siding to its original look and functionality in no time.

What is the average cost of an ADU in California?

The average cost of an ADU in California varies based on size, design, materials, and location. Generally, ADU construction costs range from $100,000 to $400,000. Here’s a breakdown of estimated costs:


Garage Conversion ADU: $80,000 – $150,000

Attached ADU: $150,000 – $300,000

Detached ADU: $200,000 – $400,000+


Additional expenses may include permits, utility connections, and site preparation. Local regulations and material choices can also impact costs

What is the cheapest way to build an ADU in California?

Building an Accessory Dwelling Unit (ADU) in California can be costly, but there are several ways to save money. Here are some tips for building the most affordable ADU:

1. Choose a Simple Design

  • Stick to a basic, efficient floor plan with minimal custom features.
  • Consider prefabricated or modular units, which can be more affordable than custom-built options.
  • Avoid expensive high-end finishes and keep the design streamlined.

2. Utilize a Pre-Approved Plan

  • Many cities in California offer pre-approved ADU plans that can save on architectural and engineering costs. Contact our contractors so they can source them for you.
  • Check with your local municipality to see if they have any standardized plans that you can use.

3. DIY and Contractor Combination

  • If you have construction skills, you could do some of the work yourself, such as painting, landscaping, or installing finishes. Contact us to go over the services you need and get a free quote.
  • Hire our contractors for specialized tasks like electrical, plumbing, and framing, which require professional expertise.

4. Go Small

  • Keep the size of the ADU small, as costs typically scale with the size of the unit. A smaller ADU will have fewer materials, a quicker construction timeline, and lower utility costs.

6. Use Affordable Materials

  • Materials like vinyl or composite siding, asphalt roofing, and engineered wood products are generally less expensive than premium options like cedar or stone

8. Take Advantage of California’s ADU Incentives

  • California has laws in place that make it easier and cheaper to build an ADU. Some municipalities offer incentives, fee reductions, or fast-tracked approval processes for ADU permits, so research local regulations and take advantage of them.

9. Build Your ADU Above a Garage or Existing Structure

  • If you already have an existing garage or outbuilding, consider converting it into an ADU rather than building a completely new structure. This can significantly reduce construction costs.

Call The Go-To ADU Builders In Sunnyvale, Los Altos & Palo Alto, CA

Transform your property with a beautifully designed, affordable ADU. At Eco Scale Construction, we specialize in creating efficient, eco-friendly ADUs that fit your needs and budget. Serving Sunnyvale, Los Altos, and Palo Alto, we’re here to make your vision a reality.


Contact us today on (650) 207-7703 for a free consultation and learn how we can help you build the perfect ADU!

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