ADU Builder San Jose: Expert Guide to Accessory Dwelling Units

Accessory Dwelling Units (ADUs) have become a popular home addition for San Jose homeowners looking to expand their living space or tap into potential rental income. As bustling urban areas like San Jose continue to face housing shortages, ADUs offer a unique solution to maximize space and property value.


These compact, self-contained units can be attached to an existing home or built as freestanding structures, serving as an excellent option for families or investors seeking to create a secondary housing unit on their lot.

When planning to construct an ADU, it’s crucial to navigate the various stages thoughtfully, from understanding the city’s zoning laws to finalizing the design that fits both your needs and budget.


The right ADU builder will not only guide you through the design and permitting process but also ensure the construction is executed to the highest quality standards. A well-planned and built ADU can provide added flexibility, whether you’re aiming for a private space for guests, a home office, or a steady source of rental revenue.

Key Takeaways

  • We can leverage ADUs to expand living space and provide additional income.
  • Involving a skilled ADU builder is integral to navigating the planning and construction stages effectively.
  • ADUs should be optimized to meet our specific needs, whether for rental purposes or family use.

Understanding ADUs in San Jose

General Contractors In San Jose CA- ASL Remodeling Construction Company


In San Jose, Accessory Dwelling Units offer flexible living options and a chance to leverage property for rental income. Our aim is to provide clarity on ADU implementation, adherence to local regulations, and the advantages for property owners.

The Basics of Accessory Dwelling Units

Accessory Dwelling Units (ADUs) are independent residential units that exist on the same lot as a primary dwelling. These units, often referred to as secondary units, granny flats, or in-law suites, typically include a kitchen, a bathroom, and a separate entrance.


ADUs can take several forms:

  • Detached ADU: Stands alone, separate from the main house.
  • Attached ADU: Shares a wall with the main house but retains its own entrance.
  • Garage Conversion: Transforms an existing garage into a living space.

Regulations and Building Codes in San Jose

San Jose has actively updated its zoning laws to accommodate the surge in ADU construction.

It’s crucial for homeowners to understand the specific regulations and building codes that govern ADUs in the city. Key points include:

  • Size Restrictions: ADUs in San Jose must conform to size limitations, which may vary depending on the lot size and type of ADU.
  • Setback Requirements: These dictate the distance an ADU needs to be from property lines.


The city offers a Universal Checklist to help homeowners determine if their properties are eligible for ADUs.

ADU Benefits for Homeowners

ADUs provide several benefits for homeowners, notably the potential for supplemental rental income.

By converting unused space, such as a garage, or adding a new structure, property owners can attract tenants and monetize their investment.


  • Increased Property Value: Adding livable space generally boosts the market value of the property.
  • Flexible Use: ADUs can serve as home offices, guest houses, or housing for family members.

Planning Your ADU Construction

In San Jose, we understand the importance of meticulous planning in constructing an Accessory Dwelling Unit (ADU). The journey begins with a solid design, navigates through the complexities of permits and legal requirements, and balances the financial aspects to ensure a successful project.

Designing Your ADU

We begin with a thoughtful design process that evaluates floor plans and cost-efficiency.

Our design choices reflect the needs of future occupants and ensure that your ADU complements the main residence.

We focus on crafting a design that is not only aesthetically pleasing but also functional and sustainable.

  • Create detailed floor plans to maximize space and functionality.
  • Aim for cost-efficient solutions that meet budget without compromising quality.

Securing Permits and Legal Requirements

Next is the complex permit process. We navigate through San Jose’s regulations to secure the necessary approvals.

It’s imperative to submit preapproved construction plans and adhere to zoning codes, ensuring compliance with all legalities.

  • Ensure permits are in accordance before construction begins.
  • Adhere strictly to the City of San José’s zoning codes and legal requirements.

Budgeting and Financing Options

Finally, we establish a clear budget and explore various financing options. Transparent about costs, we provide you with detailed breakdowns and guide you through the available financial pathways to fund your ADU project.

  • Prepare a concise budget that accounts for all foreseeable expenses.
  • Discuss financing options to secure the necessary funds with confidence.

Choosing the Right ADU Builder


When embarking on the construction of an ADU, it’s crucial for us to engage with builders whose expertise and workmanship align with our project goals.

Ensuring the selection of a competent and reliable builder will greatly impact the success of the ADU development.

Evaluating Professional Builders

The first step we take is a thorough evaluation of the builder’s professional background.

We prioritize builders with a solid track record in ADU construction and those who have a comprehensive understanding of San Jose’s specific building codes and regulations.


For instance, Acton ADU has over 30 years of residential building experience, and their specialization in San Jose ADUs provides them with an edge in professional service delivery.

  • Experience: 30+ years (Acton ADU)
  • Specialization: ADU construction in San Jose
  • Pre-approved Plans: Yes (Acton ADU offers the most in San Jose)

Craftsmanship and Quality Materials

We understand that true craftsmanship is reflected in both the construction process and the quality of materials used. Our focus is on builders who use superior materials that ensure longevity and adherence to safety standards.


The details in finishes, fittings, and structural integrity are tell-tale signs of a builder’s commitment to quality.

  • Focus Areas:
    • Structural integrity
    • Safety standards adherence
    • High-quality finishes

Local Contractor Recommendations

Local contractor recommendations are invaluable. We seek out feedback from past clients and assess online testimonials to gauge the reliability and reputation of local contractors.


Recommendations help us collaborate with a professional who not only has a proven track record but also understands the unique requirements of San Jose’s ADU projects. Local contractors, with a robust portfolio and client satisfaction history, such as May Construction, typically have the experience necessary to navigate any project-specific challenges.

  • Recommendation Sources:
    • Past client feedback
    • Online testimonials
    • Demonstrated understanding of San Jose ADUs

The Construction Process Explained

Building an ADU requires meticulous planning and execution at each stage of the construction process. From laying the foundation to applying the final coat of paint, we ensure the strictest adherence to local building codes and high-quality workmanship.

Stages of Building an ADU

The construction of an ADU in San Jose entails several key stages:

  1. Design & Approval: We finalize ADU designs and secure necessary permits from the City of San Jose, adhering to the preapproved plans when applicable.
  2. Excavation & Foundation: Earth is excavated to set the foundation, which ensures the structural integrity of the ADU.
  3. Framing: The ADU takes its first form during framing, where the structural skeleton is built.
  4. Roofing & Exterior Work: We construct the roof and complete the exterior work to protect the ADU from the elements.
  5. Rough-in Work: Plumbing and electrical systems are installed during this phase.
  6. Insulation & Drywall: Following this, walls are insulated and drywalled.
  7. Finish Work: The final touches include flooring, cabinets, fixtures, and painting.

Specialized Areas: Plumbing, Electrical, and Framing

  • Plumbing: Our plumbing work involves installing pipes and fixtures to ensure a functional and reliable water system.
  • Electrical: The electrical system is meticulously planned and implemented to power the ADU safely.
  • Framing: The framing phase requires precision, as the quality of framing sets the tone for the stability of the ADU.

Interior Considerations: Flooring to Fixtures

For the interior, we carefully select materials and products that will define the ADU’s aesthetic and functionality.

  • Flooring: Options like hardwood, tile, or carpeting are chosen based on the intended use and preference for durability and style.
  • Cabinets & Countertops: We install cabinets and countertops that marry form and function, often opting for materials like granite or quartz.
  • Paint & Tile: A meticulous approach to painting and tiling ensures a clean, polished look.
  • Fixtures: The final stage involves installing fixtures such as lighting, faucets, and appliances, which are the finishing touches that make an ADU truly habitable.

Optimizing ADU for Rental or Family Use


In San Jose, we understand that building an ADU, or Accessory Dwelling Unit, is an investment in flexibility and efficiency.

Whether our goal is to host family, create a fully-functional home office, or optimize the unit as a rental property for passive income, careful planning of layout and amenities is key to our success.

Creating Functional and Livable Spaces

When designing an ADU for either family use or as a rental, functionality is paramount. Our focus should be on maximizing the utility of each space within the ADU. For instance, detached ADUs provide privacy and independence, making them ideal for guests or renting out.


Here’s how we ensure every area is functional:

  • Kitchen: An efficient kitchen is vital, equipped with necessary appliances and counter space. It should maintain a functional layout that allows for meal preparation without wasted space.
  • Bathroom: Incorporate a full bathroom with mindful space-saving fixtures.
  • Bedroom: Bedrooms should balance coziness with storage options, such as built-in shelves or closets.
  • Living Room: A flexible living room doubles as an entertainment area or secondary home office when necessary.
  • Home Offices: With the rise of remote work, a dedicated space for a home office or home offices is highly desirable for both family members and tenants.

Maximizing ADU Rental Potential

To turn an ADU into a source of passive income, special attention must be given to features that enhance its attractiveness as a rental unit.

Here’s a straightforward blueprint for us to follow:

  • Location & Privacy: A detached ADU located appropriately on our property can significantly increase its rental appeal, offering tenants a sense of privacy.
  • Amenities: A fully equipped kitchen, in-unit laundry, and private bathroom are must-haves for long-term tenants.
  • Separate Entrance: Ensure a separate entrance to give tenants autonomy and privacy.
  • Internet Access: Reliable high-speed internet is no longer a luxury but a necessity, particularly if we are marketing the space as conducive to home offices.

Frequently Asked Questions

In this section, we address some common inquiries individuals have about ADU construction in San Jose to provide clarity on costs, finding builders, the permit process, prefab options, construction timelines, and affordability.

What are typical construction costs for an ADU in San Jose?

Construction costs for an ADU in San Jose vary significantly based on size, design, and finishes, but prices typically range from $300 to $600 per square foot.

It’s important to consider all aspects, from design and permits to materials and labor, to get a comprehensive estimate for your project.

How can I find reputable ADU builders in the San Jose area?

To find reputable ADU builders, start by checking local listings and reviews, asking for recommendations from friends or family, and verifying contractor licenses through the California State License Board. Additionally, you can contact the City of San José for a list of preapproved ADU builders.

ASL Remodeling is here to help if you need a reputable ADU builder in San Jose.

What are the steps involved in obtaining an ADU permit in San Jose?

Firstly, hire a professional, such as an architect or contractor, to create the required building plans.

Then submit these plans to the City of San José for review. Upon approval, you will receive a building permit, allowing you to legally start construction.

Regular inspections will be conducted throughout the building process to ensure compliance with the permit requirements.

What options are available for prefab ADUs in San Jose?

Prefab ADUs are an expedited option for homeowners in San Jose.

The city has preapproved certain prefab ADU designs that can simplify and speed up the permitting process. These premanufactured units come in various sizes and styles, accommodating different homeowner needs.

How long is the construction process for an ADU in San Jose?

The construction process for an ADU can take several months, from obtaining the necessary permits to completing the build.

The timeline varies based on the project’s complexity, prefab or custom builds, and the responsiveness of contractors and city officials.

Are there any affordable ADU builders in the San Jose region?

There are builders who specialize in more affordable ADU options in San Jose.

Research and inquire about builders who offer competitive pricing.

Consider looking into companies that provide preapproved ADU designs, which can be a more cost-effective solution.

ASL Remodeling

Are you searching for the best ADU builder San Jose? This is the perfect place for you. Because ASL Remodeling Construction Company can provide you with the best ADU in San Jose. Our experience in the construction project makes us a better option. An Additional Dwelling Unit will increase the property value and it will help you to make a space for yourself, your family members, and guests.

San Jose ADU Builders

San Jose is the largest city in Northern California’s Bay Area and the third-largest city in California. Known as the capital of Silicon Valley, San Jose is home to some of the world’s most innovative companies, including Apple, eBay, Adobe, and Cisco. The city offers vibrant cultural attractions, a variety of outdoor activities, and excellent educational opportunities. Among the construction companies, ASL Remodeling Construction Company is one of the best ADU builder San Jose.

Best CA ADU Plans

ADU plans refer to accessory dwelling unit plans, which are comprehensive and detailed sets of plans that provide instructions for constructing a secondary living space on an existing property. These plans typically include the layout of the building, including interior walls, windows, doors, stairs, and other features. They also indicate any required permits or other approvals that may be needed to build the ADU.

Types Of ADU

You need a plan and you need to choose an ADU builder to complete your projects. Here are some of the most common types of ADU you can think of-

  • Attached ADUs
  • Garage Conversion ADUs
  • Internal ADU
  • Detached ADUs
  • Small ADUs

After doing an analysis of all types of ADUs, you can choose the right type for you.

san jose adu- ASL Remodeling Construction Company5 Benefits Of Building An ADU

There are a lot of benefits to building an ADU. Some people prefer the room addition service over the ADU building. Both have their own benefits. Here are the benefits of building an ADU-

1. Increase Home Value

An additional dwelling unit can increase the value of your home. The buyers like a home with an ADU. There are some research and analysis available online. However. it can increase the home value by up to 30%. In some places, it may become 50% which is great.

2. Living Space For Guests

For guests, an ADU is better than a separate room. If you build ADU for guests, it will not help you in many ways. It will help you to maintain privacy in your daily work. So, many people want to build an ADU for guests.

3. Great Home Office

It can be your home office. In 2023 home office becomes more popular after the pandemic. An ADU can provide a great place for a home office. No one will disturb you. So, it will be a great idea to build an ADU.

4. Affordable Housing Option

ADU does not cost too much money. So, it is always an affordable option. And it can save you money in the long term. Above all, it increases the home value. Building a small ADU will not cost you a lot of money. So, you should consider building it.

5. Living Space For Adult Children

Your adult children may want a separate home for themselves. And it will be a costly project. So, ADU can be a great option for them. They don’t need to buy a new property.

10 Effective Tips To Choose ADU Builder San Jose

A wrong decision will surely bring suffering for you. So, you need to make the right choice for selecting an ADU builder San Jose. Here are 10 amazing tips that will guide you to make the right decision-

1. Make A List Of Companies

This is an important step in the whole process. So, you need to do some research. Therefore, you will be able to make a list of ADU builder companies. You can ask for recommendations and read reviews. In addition, you can read blogs to make the list of reputed and experienced construction companies in your area.

2. Consider The Past Experience Of The ADU Builder San Jose

You must consider the past records of a construction company. Because some of the companies may have had a bad record in the past. They may violate laws. So, you need to avoid them. And you should choose a company with a clean record. The past record also can help you to know their quality as an ADU builder San Jose.

3. Cost Of The Service

You should try to choose the most affordable option. So, you can get quotes from multiple companies. Therefore, you can compare the costs to choose the most suitable option. Before that, you should judge other qualities of an ADU builder.

4. Quality Of Workers

Workers with previous experience in home remodeling or, home building can provide the best result. So, you should choose the workers with training and skills. Therefore, you will be able to build the best ADU in San Jose.

5. Meet The ADU Builder Face To Face

Sometimes, the available information online is not 100% accurate. So, you need to meet the builder and collect more information about them. In addition, you can know more about their previous work and the different features of their service. So, you can schedule a consultation with the ADU builder San Jose. It will help you to make the right decision in the end.

6. Ask For A Copy Of The License

License is mandatory for construction companies. So, you need to make sure that you are hiring a licensed company for building an ADU in San Jose. Also, the license is a sign of quality. So, you should ask for a copy of the license before choosing a construction company for the ADU building.

7. Insurance Of The Workers

Insurance is essential for construction workers. It gives them a feeling of safety during work. So, you need to hire insured workers for the ADU building. In addition, you should follow other ADU regulations as well. A professional ADU builder San Jose can provide a perfect service.

8. Experience Of The Workers

The experienced workers and experienced ADU builder San Jose knows the challenges of an ADU project. Because they faced the same challenge many times in the past. They also know the way to overcome it. So, you should hire experienced people to complete your project.

9. Good Knowledge Of ADU Building

The ADU contractor should have good knowledge of their work. They need to know the construction works in detail. If they have previous experience and technical knowledge they can provide the best service in the end. So, you should hire a knowledgable company.

10. Select A Professional ADU Builder San Jose

After all these things, you need to select a professional company. You can consider some of the signs of professionalism. You can consider their efficiency, punctuality, honesty, and other qualities. Therefore, you can choose a professional ADU builder San Jose.

san jose adu- ASL Remodeling Construction CompanyWhat Makes ASL Remodeling Construction Company Better ADU Builder San Jose Than Others?

There is a lot of ADU builder in the San Jose area. You can compare their quality and prices. Therefore, you can choose the best one. Here are the reasons why ASL Remodeling is better than other companies-

  • Decades Of Experience: We are in the construction business for more than 20 years. So, we have faced many challenges in the past and overcome those. In addition, as a local company, we can offer better quality at a reasonable cost. So, you can rely on us.
  • Experienced & Skilled Workers: We have our quality standards. We never use unskilled people to complete our projects. So, all our workers are highly trained and experienced. They know that way to overcome existing challenges.
  • Best Designers: We can offer the best design for your ADU. So, you will be able to choose the right option for your home. We know the purpose of building ADU. And we worked on similar projects. So, we can provide the home you want.
  • Satisfied Homeowners: If you read the reviews on Yelp, Google, and Houzz, you will find that all the homeowners are satisfied with our work. They found us as the best ADU builder San Jose. So, you also depend on us for the best ADU.
  • Professional Service: We always listen to each of our customers. In addition, our workers are punctual and honest. So, you can expect a professional and effective ADU building service from us.

These are the quality that most people look for. If you judge according to another quality parameter. You will surely find us equally good as ADU builder San Jose.

ADU Bay Area

When seeking professional remodeling contractors, the choice of a reliable contractor is paramount. ASL Remodeling Construction Company emerges as the prime option, recognized for our commitment to quality and premium customer service. A preferred choice for many, you too can opt for our expertise to enhance your remodeling experience.

Frequently Asked Questions:

Where can I find ADU builders bay area?

To find ADU building services, you can search the construction companies on Yelp, Google, or, Houzz. In addition, you can follow the social media discussion. It will help you to find out the best companies according to customer reviews. You also can do some analysis and research on ADU builders. Therefore, you will be able to make the right decision in the end.

Is ADU a good investment in Bay Area?

ADU can be a good investment in the Bay Area due to the high demand for housing and the rising costs of home ownership. ADUs are smaller homes that can be built on existing lots, providing much-needed additional housing options for those looking for affordable living in the area. Additionally, ADUs do not require as many permits and approvals as traditional construction, making them a faster and easier option for investors.

Can I put a guest house on my property?

The answer to this question depends on where you live. Each area has its own zoning ordinances, which will determine whether or not you can build a guest house on your property. It is best to contact your local zoning department for more information.

How to Hire ADU Contractor in the City of San Jose?

To hire an ADU builder San Jose, you need to have a proper plan. Otherwise, you may have to suffer a lot. You can create a list of companies. Therefore, you can narrow down it according to some qualities. Finally, you can choose the right one. We think ASL Remodeling Construction Company can be the best option for you.

Does a Garage Conversion Add Value to a House?

Yes, a garage conversion can add value to a house. Depending on the amount of space available and the type of conversion that is done, it can add anywhere from 10-20% to the overall value of the home. This added value can be used to help offset any costs associated with the conversion or for other renovations or updates that may be needed.

Read More About:

Frequently Asked Questions



Our Process:

We begin by scheduling a site visit with one of our project manager specialists to listen to your ideas, desires, budget, and goals. During the meeting, we’ll understand your vision and gather all necessary details. We value your input and will provide ideas, a ballpark number, and a timeline. believe in open communication throughout the process.

Whether you choose our basic design or have a dedicated interior designer, our specialists, architects, and designers will translate your vision into detailed floor plans.

We’ll consider every aspect, from architectural and engineering design to very realistic 3D renderings with all the finish materials integrated into material selection. We’ll collaborate closely with you to ensure the design meets your expectations.

Once the design is finalized, we’ll provide you with a comprehensive proposal.

It includes the cost of the project, inspections, timelines, and project scope. We believe in transparency, so we’ll address any questions or concerns you may have before proceeding.

With the work order agreement approved, we’ll proceed with the necessary agreements and permits.

Our team will handle all the paperwork, including pulling the city permits required for the project. We’ll ensure compliance with local regulations, making the process hassle-free for you.

With permits obtained, our skilled craftsmen will begin the construction phase with full support and tight communication with your dedicated project manager throughout the entire length of the project. We’ll bring your vision to life, paying attention to every detail and ensuring the highest level of craftsmanship.

The transformation is complete. Enjoy your new, beautiful living spaces. Your dream home has become a reality with ASL Remodeling

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Trusted By Happy Clients

At ASL Remodeling, we are committed to providing exceptional design and build services to our clients. Don't just take our word for it – hear from some of our satisfied customers below.​

Adi Yossef
We were looking for a company that was transparent, responsive and did high quality jobs. We heard about ASL Remodeling through a family friend for a property of ours in the Bay Area. We needed to do a full home renovation. Yoni came to meet us, he was so knowledgeable and guided us through the entire process. All the work was completed while we were outside of the country, so trust and communication were crucial. They were on top of everything. They kept us informed at every stage. They were very professional and we are so happy with the final result. Grateful to ASL Remodeling, looking forward to working with them again in the future.
Recently, we were seeking for someone to replace our old, less practical kitchen with a new one that was more functional. Choose ASL Remodeling, as recommended by my best buddy. They sincerely want to give you the best of whatever they have to offer, which is why they are incredibly patient and open-minded. the countertop manufacturer to working with their really fantastic cabinet maker. I just want to offer more and more, wow. Next year, we're planning to move into the entire house, and only one company—ASL—will handle it. We appreciate your generosity, gentlemen.
Andrew Leung
ASL Remodeling did a great job with a whole home remodel for us. The project stayed on track and on budget (well we choose to add a few things along the way). We did flooring, doors, 2 fireplaces, a whole kitchen, stairs, railing, etc… and we are happy with how everything turned out. ASL also did a great job helping us out with unexpected fixes when winter weather threw us some curveballs. We’re looking forward to working with ASL on our next home project and recommending them to friends and family.
Eloy M Valdez Aispuro
We had a great experience with ASL Remodeling. Our full home renovation was fairly complex, it was a complete renovation with new Master Bath, Kitchen with full custom cabinets, a powder room, and building out a new area and wiring for the washer/dryer. Yoni (the job boss) and the crew were fantastic. The team was especially great. They were very responsive and kept us abreast of the next steps and what to expect. The same goes for the office. We couldn't be happier with the final new Home that we received.
Ella Morgan
I wish I could give 10 stars for this construction company ! They were close by and very convenient. These guys are extremely talented and truly have a passion for remodeling, and delivering a great experience for their customers. My total home renovation was handled seamlessly. From my 1st conversation to the final days of the project, the entire crew were always available, on time, and professional. They cleaned up all the debris left daily and wore masks the entire time. They promised to deliver more than I asked for. Well done ASL Remodeling!! We appreciate all your hard work.
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