Attached ADU Construction

Transform your Long Beach property with an expertly crafted attached accessory dwelling unit from Modern ADU Builder & Garage Conversions. Our attached ADUs seamlessly integrate with your existing home, creating versatile living spaces that maximize your property's potential while maintaining architectural harmony.


As attached ADU construction specialists, we navigate the unique challenges of attached construction—from structural integration to utility connections—with precision and care. Our team handles every aspect from initial design through final inspections, ensuring your project meets all local building codes and zoning requirements specific to Long Beach properties.


Attached ADUs offer distinct advantages: lower construction costs than detached units, shared infrastructure, and efficient use of limited lot space. Whether you're creating a rental unit for passive income, accommodating family members, or adding flexible space for your evolving needs, our designs prioritize functionality without compromising style.


Our comprehensive process includes thorough site evaluation, customized architectural plans, permit acquisition, and quality construction. We pride ourselves on transparent communication throughout your project, keeping you informed while minimizing disruption to your daily life.


Modern ADU Builder & Garage Conversions delivers attached ADUs that not only enhance property value but create living spaces that residents genuinely love. Contact us today to explore how an attached ADU can transform your property and lifestyle.

Our Construction Services

We specialize in providing comprehensive attached ADU construction services tailored to the unique needs of homeowners in Long Beach. Our approach focuses on innovative design, customized floor plans, and quality materials to ensure that your attached ADU meets all functional and aesthetic requirements.

Designing Your Attached ADU

When designing your attached ADU, we emphasize collaboration and creativity. Our team works closely with you to understand your vision and needs.

We take into account factors such as:


  • Local Regulations: Compliance with zoning laws and building codes in Long Beach.
  • Site-Specific Considerations: The layout of your property, orientation, and existing structures.
  • Functional Spaces: Ensuring that the ADU serves its intended purpose, whether as a rental unit or a guest house.


Our objective is to create a functional, appealing space that complements your home and enhances your property's value.

Custom Floor Plans and Layouts

We offer custom floor plan solutions designed to maximize the use of available space. Each design is tailored to fit your lifestyle and preferences while adhering to local regulations.


Some key features include:


  • Flexible Layouts: Options for one-bedroom, two-bedroom, or studio layouts.
  • Open Concept Designs: Enhancing spaciousness and light flow.
  • Smart Storage Solutions: Incorporating built-in shelving and cabinetry.


Our focus is on practicality while maintaining a stylish approach, ensuring that your ADU serves as a valuable addition to your home.

Materials and Building Methods

Quality materials and building methods are vital to the longevity and beauty of your attached ADU. We prioritize durable construction practices and sustainable materials.


Key elements include:



  • Energy-Efficient Insulation: Reducing energy consumption and improving comfort.
  • High-Quality Finishes: From flooring to cabinetry, every detail matters.
  • Eco-Friendly Options: Utilizing sustainable materials wherever possible.


By choosing Modern ADU Builder & Garage Conversions, you're investing in a dependable and attractive ADU that enhances your property for years to come.

Permitting and Regulatory Guidance

Understanding the permitting and regulatory landscape is crucial when planning for an attached ADU. We ensure our clients are informed every step of the way, from zoning requirements to the application processes. Below, we outline essential aspects of navigating these regulations in Long Beach.

Navigating Local Zoning

In Long Beach, we must adhere to specific zoning regulations that govern the construction of attached ADUs. Zoning laws dictate the allowable locations, size, and design of ADUs.


Some key zoning aspects include:



  • Minimum Lot Size: Properties must meet minimum requirements, often based on the type of zoning district.
  • Setback Requirements: These regulations specify how far structures must be from property lines.
  • Height Restrictions: There are limits on how tall an ADU can be to ensure it complies with neighborhood aesthetics.


We collaborate with local authorities to confirm compliance with these codes, ensuring a smooth construction process.

Permit Application

The permit application process for attached ADUs in Long Beach involves several steps. We help our clients navigate this often complex journey with ease.



  1. Pre-Application Consultation: We recommend discussing plans with the city’s planning department to grasp initial requirements.

  2. Documentation: Our team assists in compiling necessary documents, including site plans, construction plans, and details about utilities.

  3. Application Submission: Once documents are prepared, we submit the application to begin the review process.

  4. Review Period: The city typically takes around 20 to 30 days to review applications. During this time, they may request additional information or modifications.

  5. Permit Issuance: Upon approval, we secure the necessary permits before construction begins.

By guiding our clients through these stages, we help turn their vision for an attached ADU into reality with a clear understanding of all regulatory requirements.

Why Work with Us

We combine local expertise with a commitment to client satisfaction and high-quality standards. Our approach ensures that your Attached ADU project will be handled with precision and care.

Experienced Local Team

Our team consists of skilled professionals with extensive experience in constructing ADUs in Long Beach, CA. This local knowledge allows us to navigate zoning regulations, permitting processes, and design standards specific to the area. We understand the unique challenges and opportunities presented by local building codes and climate considerations.

Quality Assurance

We adhere to the highest quality assurance standards in the industry. Each construction project undergoes rigorous inspection processes to guarantee that every detail meets our specifications. Our commitment to quality extends to the materials we use. We select only durable, sustainable products to ensure that your ADU not only looks great but stands the test of time.

Client-Centered Approach

We prioritize your vision by engaging in open communication throughout the entire project. Our project managers work closely with you to establish clear timelines, budgets, and expectations. We believe in transparency and regular updates. You will be informed every step of the way, allowing for adjustments to be made as needed.

FAQs on Attached ADU Construction


We understand that you may have questions about the process of building an Attached ADU with Modern ADU Builder & Garage Conversions. Below, we address specific steps involved to clarify what you can expect.

  • What is the average cost of building an attached ADU in Long Beach, CA?

    The average cost of building an attached ADU in Long Beach typically ranges from $250-350 per square foot, meaning a 500 sq ft attached ADU would cost approximately $125,000-$175,000. Costs vary based on design complexity, finishes, and whether structural modifications to the existing home are needed.

  • How long does it take to build an attached ADU in Long Beach?

    The timeline for an attached ADU in Long Beach generally spans 6-9 months total: 2-3 months for design and permitting, followed by 4-6 months for construction. Attached ADUs often have shorter construction periods than detached units since they utilize existing structure elements.

  • What permits are required for attached ADU construction in Long Beach?

    You'll need a building permit, which includes architectural, structural, mechanical, electrical, and plumbing reviews. Long Beach also requires planning/zoning approval to verify the ADU meets city codes. Additional permits may include fire safety review if changes to fire separation walls are needed.

  • Can I build an attached ADU on my Long Beach property?

    Yes, if your property has a single-family home or duplex. Long Beach follows California state law allowing attached ADUs on residential properties regardless of lot size. Your property must have sufficient space to meet minimum ADU size requirements while maintaining required setbacks.

  • What are the size limitations for attached ADUs in Long Beach?

    In Long Beach, attached ADUs can be up to 50% of the primary dwelling's living area, with a maximum of 850 sq ft for a studio/one-bedroom or 1,000 sq ft for a two-bedroom unit. The minimum size is 150 sq ft. These units must comply with height limitations of the primary structure's zoning.