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Accessory Dwelling Units (ADU) Builders and reliable garage conversion contractors
ADU (Accessory Dwelling Unit) Contractors and garage conversion builders

ADU Unit Construction in the City of Sunnyvale, CA

First step of working with Wise Builders is meeting and looking into the construction plans for your home remodel
Step 1: Let's Get Started
Initial Contact

During our first conversation, our team will ask you a handful of general questions regarding your ADU or garage conversion project so that we can better understand your needs and desires. If it feels like we are a good fit for each other, we will assign an experienced project manager to visit your property for your free in-home consultation.

Free In-Home Consultation

The project manager will arrive on the agreed-upon day & time and examine the location of where you plan to build your ADU. Your project manager will be your main point of contact from this point on so that they can truly understand your vision, style, and design ideas for your ADU project in Sunnyvale.

Scope of Work

If all goes well during the in-home appointment, your project manager will work with you and our office to break down the scope of the project. This phase will include an estimate of pricing for the project, the anticipated process, and the expected timeline for the completion of your new Accessory Dwelling Unit.

Iphone of website of Wise Builders contractors
Wise Builders truck with brand logo and company information
Free in-home consultation

Allow us to show you what we can do for you with our no-obligation, free in-home consultation.

Step 2: Build Framework
Meet At Our Showroom

It is incredibly important to us that you’re able to touch and feel the material finishes available to you so that you can make a confident decision on the design of your ADU. Our showroom in San Jose will feature beautifully designed cabinetry, a variety of exquisite tiles, and many more materials to complete your ADU project in Sunnyvale.

Finalize Gameplan

As you decide on your design and finishes, we will provide you with the final drawings, layout, design, and 3D renderings so that you can truly see how your ADU or garage conversion will look when we complete your project. Your project manager will walk you through all of the possible choices and outcomes you may have before finalizing your project.


At this point, the excitement has built up and we will both be incredibly eager to get started on your dream project! So upon review of all the finalized details, your project manager and our office will work with you to review and sign the contract so that we can finally begin building your ADU unit in the city of Sunnyvale!

Wise Builders showroom in san jose, california with cabinetry and door examples for your home remodel
Doors and cabinet shopping at the Wise Builders Showroom in San Jose for your complete home Remodel
Step 3: Pre-Construction
Obtain Permits

Our team will immediately begin obtaining permits and scheduling appointments with the necessary trade experts to guarantee your home is in the optimal state needed to begin the ADU construction phase. Your project manager will handle this process from A to Z.

Time To Shop!

This is the fun part! Time to shop! You and your project manager will take the time to review all the remaining materials, fixtures, and accessories needed for your ADU Design-Build from our most trusted vendors. These selections will give that final touch to your beautifully designed accessory dwelling unit in Sunnyvale.


Consistent communication is crucial for a successful process and the peace-of-mind knowing that your project is moving along. Due to our expertise and the care that our project managers have for their projects, you can expect a smooth and transparent process to completion of your new ADU home.

Step 4: Construction Phases

The initial phase of the actual construction will consist of us demolishing the area and removing all of the unwanted materials. Cleaning out the space in a timely manner will ensure that we stay on track with our Sunnyvale ADU housing project timeline and prepare us for the framing phase.

Framing and Preparation

Preparation is a key part of a truly smooth installation process, so it is incredibly important that we inspect the space after it’s been demolished and begin the process of framing the structure. As framing is completed, we can then stucco the exterior, interior drywall, plumbing, and other aspects needed to move on to the installation phase.


It’s finally here! The installation process is where your brand new ADU or garage conversion begins to take shape and finally comes to life. Your project manager will ensure that each step is handled with care so that everything is installed in a clean and perfect manner.

Interior home remodel during the construction phase by Wise Builders
Finishing touches of the interior remodel before final inspection by Wise Builders
Step 5: Wrapping Up & Closeout
Review Final Touch-Ups

Once we complete the installation, your project manager will walk through the entire project with you and review the final punch list to ensure that everything was covered and handled properly. Any adjustments or minor tweaks will be handled in this phase of your accessory dwelling unit project.

Final Inspection

While it is hard to say goodbye, we know how excited you will be to finally enjoy your beautiful new ADU home. So this final walk-through with your project manager will be the final inspection needed to bring your ADU project to completion in Sunnyvale.

5-Star Review!

If your project manager made your ADU construction process seamless and enjoyable, then let’s give them the praise they deserve! You can find us on all review websites like Yelp and Google, and it truly warms our hearts to hear the good news directly from you!

Wise Builders logo and branded hard hat, which is the construction hat
Ready to move forward?

Begin your home remodeling project with us today with our free in-home consultation.

Do you find yourself in need of extra space? Do you think you can benefit from passive income? If the answer to these questions are yes, then you might be exploring building an ADU in your backyard. ADU builders in Sunnyvale, CA, can help design and build your dream ADU unit in your area. 

Building a secondary unit in the City of Sunnyvale ADU could be an incredible investment decision. It can also serve as a much-needed space when family comes to visit. The best part is it doesn’t require significant infrastructure, so the construction can be quick and cost-friendly. 

The most difficult part of the process is choosing a professional ADU builder you can trust. The experts at Wise Builders are the best Sunnyvale ADU Contractors out there! They will advise you every step of the way. Let’s brush over some basics before jumping into the details.

What is an ADU?

An ADU is a secondary dwelling unit on the same property as the primary house. People also refer to them as an accessory apartment, backyard cottage, and granny flats.

In order for your dwelling unit to be considered a legal Sunnyvale ADU, it has to be on the same property and also contain its own bathroom and kitchen.

You cannot buy or sell it separately, which is something ADU builders should always remind their clients. ADU builder in San José, CA also must follow the same rules and requirements for any ADU project. 

What does ADU stand for in real estate?

In real estate, ADU stands for Accessory Dwelling Unit. The demand for ADU contractors in Sunnyvale, CA, is quickly increasing. This is because real estate investors are looking for alternative investments, as home prices and interest rates rise.

Home Remodeling is another in-demand service in California that can add value to your home. Wise Remodeling provides excellent Kitchen Remodeling in Sunnyvale.

How to know if you can build an ADU on your property in Sunnyvale

State laws permit you to build at least one ADU on your property. Sunnyvale ADU Builders should be able to let you know what type of ADU is permissible to build on your property. Based on your property size, location, and desired ADU square footage – there will be different regulations. 

Types of ADU units you can build in Sunnyvale, California

You can choose from various types of accessory dwelling units. Depending on the size and layout of your home, your ADU builder should advise on the best-suiting ADU.

Besides being an elite ADU construction company, Wise Builders also provides top-of-the-line Home remodeling in Sunnyvale.

Garage Conversion:

The most popular ADU housing projects for people in California are garage conversions. This is because it allows people to take advantage of the extra space they have without building a new external structure.

Sunnyvale Garage Conversions have proven to be the most cost-friendly and time efficient. This is why it is the most in-demand ADU construction service within the bay area. Wise Builders are the best equipped to handle your Garage Conversion in the SF Bay Area.

Attached Accessory Dwelling Unit

Attached Accessory Dwelling Units are units that are attached to your house- sharing a wall with the primary residence. These attached ADU homes are the perfect option if you have a senior individual who wants their own privacy but still needs supervision.

Detached ADU

Detached ADUs are stand-alone units that are completely separate from the primary house. A detached ADU home by Wise Construction is the perfect option for clients who are looking for a suite that provides more privacy.

Benefits of Building an Accessory Dwelling Unit in Sunnyvale

The benefits of building an ADU can vary from person to person. One thing everyone can agree on is: ADUs will significantly add value to your home if properly built by a professional general contractor.

The ROI (return on investment) will vary depending on taxes, material & labor costs, and local zoning regulations. Therefore, hiring a company familiar with the local laws is pivotal. Here are some other benefits of adding ADUs to your home:

  • Passive income from ADU rentals.
  • Guest house for out-of-town family and friends.
  • Low-cost housing for older people and young students.
  • Can serve as a home office.

How much does an ADU increase property value?

Every situation varies depending on market conditions and location, however, ADUs can increase the value of your home by as high as 30%. It is important to be aware that since ADUs do increase the value of your home, naturally it will increase property taxes as well. However, the primary home is not reassessed. The appraiser will assess the ADU individually by comparing it to similar ADUs in the Sunnyvale area.

Hiring an ADU Sunnyvale contractor who is familiar with tax laws is of the utmost importance. This is another reason why you should choose Wise Construction to handle your Home Addition in Sunnyvale, California.

Rent your ADU in Sunnyvale

One of the most popular ways you can monetize from your Sunnyvale ADU is by renting it out. The extra income can be used to help maintain your ADU or even help out with your mortgage payments on your primary residence.

Steps to building an ADU in Sunnyvale, CA

Building an ADU in Sunnyvale, CA, requires property owners to pay attention to the details. Most importantly, they have to find the right professional who will advise throughout the process. Below is a basic step-by-step process of building an ADU in Sunnyvale, CA:

  1. Choose the kind of ADU you want
  2. Budget properly
  3. Choose the best home builder for the job

Once you choose Wise to handle your Accessory Dwelling unit construction in Sunnyvale, CA– the next steps are as follows:

  1. Create a blueprint
  2. Get the necessary permits and legal document
  3. Secure all the required materials
  4. Start Building!

Finally, the building process includes:

  1. Placing concrete foundation 
  2. Completing the rough framing
  3. Meeting the electrical and plumbing needs
  4. Roofing/Siding
  5. Ensure the drywall and insulation
  6. Add the finishing touches!

Wise Builders also contains a team of expert Home Remodelers who provide high-quality Custom Home Building in Sunnyvale, CA.

Do you need planning permission for an ADU in Sunnyvale?

Yes, property owners need planning permission for their City of Sunnyvale ADU and should ensure they are following local laws. These requirements vary based on your ADU type, so you should consult a professional first.

Sunnyvale ADU requirements

Sunnyvale requires you to get various permits for construction and safety purposes. Five important Sunnyvale ADU requirements are listed as follows:

  • Types of ADUs allowed

  • Detached ADU, Attached ADUs, Junior ADUs, and Garage conversions are all permitted in Sunnyvale. 
  • Minimum lot size

  • Fortunately, there is no minimum lot size for ADU Sunnyvale projects. 
  • Number of ADUs allowed on the property.

  • All single property owners can create at least one ADU. In some cases, one can build two ADUs.
  • ADU Size:

  • ADU size will vary depending on the type of ADU. But, typically the max size an ADU can be is anywhere between 850-1000 square feet gross floor area.
  • Setback Requirements:

  • Statewide law requires that your ADU be built at least 4ft from your home, and also follow all fire & safety standards.

ADU contractors in Sunnyvale, CA are responsible for explaining the requirements based on ADU type and location.

Sunnyvale ADU ordinance

ADU builders in Sunnyvale, CA must follow the Sunnyvale ADU ordinance while working on ADU projects. Being familiar with the zoning laws, permits, and fees will save you from difficulties that may arise in the future.

Finding the right ADU contractor in your area

The result of your ADU project will depend on the contractor you hire. You have to ensure that your contractor is insured, licensed, and contains experience in the Sunnyvale, CA area.

Finding an ADU contractor you trust is as important as finding a home remodeler you trust. Our Bathroom Remodeling in Sunnyvale, CA is the best in Santa Clara County.

How much does an ADU builder cost in Sunnyvale?

On average, ADU construction material and labor costs are $200-$300 per square foot. However, the exact cost of your ADU builder will vary for each project, depending on the size, materials, and design. It will also depend on how quickly you need the project to be completed.

How much does an ADU cost in California?

The average cost for building an ADU in California ranges from $100,000 to $300,000. The professionals at Wise Builders offer free estimates where all the costs are outlined in advance. Wise Builders prides itself on being transparent from the beginning, so there are no surprises once construction begins.

How big can an ADU be in Sunnyvale?

The City of Sunnyvale typically will limit the size of your ADU to 850 square feet if it’s a one-bedroom and 1,000 square feet if it’s a two-bedroom. But, this can be subject to change depending on the type of ADU.

Must-know facts about Sunnyvale, CA

Sunnyvale, CA, is one of the major cities in Silicon Valley- the global center for innovation and technology. Here are some must-know fun facts about the area:

  • Sunnyvale is known as the birthplace of the video game industry.
  • It’s the second most populous city in the county, after San Jose.
  • The largest employer in the area is Google, followed by Apple inc.

Another important fact: Sunnyvale’s housing expenses are 381% higher than the national average. This makes it a prime location for ADU building.

What county is Sunnyvale, CA, in?

Sunnyvale, CA is located in the North West Side of Santa Clara County. Santa Clara County is well known for its family-friendly neighborhoods, fantastic weather, and top-of-the-line education. 

How is the real estate market in Sunnyvale?

The Sunnyvale real estate market is hot and highly competitive. The median home listing price is $1.6M and on average, they sell for about 3% above the listing price in about 19 days. ADUs can be great housing options for friends and family. But, it can also be an incredible option for anyone seeking affordable rental housing.

Building an ADU in Sunnyvale, CA has proved itself to be a great investment. California is facing a shortage in affordable housing and ADUs are an awesome alternative. ADU construction requires no land cost and provides homeowners with supplemental income. Reach out to Wise Builders to take care of the ADU building process from A-Z.

FAQs on Building an ADU in Sunnyvale, CA

Are you allowed to build an ADU in Sunnyvale?

Yes, you are allowed to build a Sunnyvale ADU if you meet the legal requirements and have a suitable property. It is smart to check with a professional ADU contractor to ensure your desired ADU complies with local zoning laws and building codes.

Does an ADU count as square footage?

Yes, ADU units will count towards livable square footage. The value of your square footage will depend on whether the ADU is attached, detached, or a conversion.

Does garage conversion devalue your house?

No, as long as your Sunnyvale garage conversion is built properly with permits and obeying local codes, it will not devalue your house. In fact, most homeowners can expect up to an 80% return on their investment.

Can an ADU be 2 stories?

Yes, most Accessory Dwelling units in CA can be 2 stories with a maximum height of 16 or 25 inches based on the specific location.  But, it is important to keep in mind that local governments have adopted certain restrictions against 2-story ADUs.

Are accessory dwelling units legal in Sunnyvale, CA?

Yes, City of Sunnyvale ADUs are legal and an excellent way to monetize off of extra space. There are various laws and restrictions that must be followed. But, Wise Builders will ensure that the entire construction journey is legal and goes smoothly.

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