Junior ADU Construction

Transform your property's potential with junior accessory dwelling units (JADUs)—the space-efficient solution for Long Beach homeowners. At Modern ADU Builder & Garage Conversions, we deliver junior ADU construction services, delivering maximum value with minimal disruption.


JADUs offer the perfect balance of functionality and affordability, creating versatile spaces for aging parents, returning adult children, home offices, or rental income opportunities. Unlike full-sized ADUs, these units (limited to 500 square feet) integrate seamlessly within your home's existing footprint—preserving neighborhood aesthetics while enhancing your property's utility and value.


Our expert team handles every aspect of your JADU construction: from navigating Long Beach's permitting requirements to designing efficient layouts that maximize limited square footage. We implement space-saving solutions, install efficiency kitchens, and ensure all work meets California's strict building codes while maintaining architectural harmony with your home.


JADUs represent a smart investment in your property's future. Our proven construction process ensures minimal disruption to your daily life while creating beautiful, functional living spaces built to last.


Discover how Modern ADU Builder & Garage Conversions can help you unlock the hidden potential in your home. Our Long Beach JADU specialists are ready to transform your vision into reality with craftsmanship that exceeds expectations.

Our Junior ADU Construction Process

We guide our clients through a structured process when constructing junior ADUs. This ensures that every detail is addressed, from the initial assessment to final construction milestones.

  • 1. Initial Site Assessment

    Our process begins with an initial site assessment. During this phase, we evaluate the existing structure where the junior ADU will be constructed.


    Key aspects assessed include:


    • Zoning Requirements: We check local regulations and zoning laws.
    • Structural Integrity: Evaluating the existing building's condition is critical for safety.
    • Utility Access: We determine the availability of necessary utilities such as water, electricity, and sewage.

    This assessment helps in developing a tailored plan that meets all code requirements.

  • 2. Design and Planning Phases

    After the site assessment, we move into the design and planning phases. We collaborate closely with our clients to create architectural plans that align with their vision for the junior ADU.


    Key elements involve:


    • Blueprint Creation: Detailed plans that specify dimensions and layouts.
    • Material Selection: Choosing high-quality materials for durability and aesthetics.
    • Permitting: We handle all the paperwork required to secure necessary permits, ensuring compliance with regulations.

    This phase is crucial for laying a strong foundation for construction.

  • 3. Construction

    The construction phase begins once designs are finalized and permits obtained. We follow a well-defined timeline to manage the project efficiently.

    Typical milestones during this phase 

    include:


    • Foundation Work: Establishing a solid base for the junior ADU.
    • Framing: Building the structural framework.
    • Utilities Installation: Running plumbing, electrical, and HVAC systems.
    • Final Inspection: Ensuring everything meets building codes before completion.

    By adhering to this timeline, we can streamline the construction process and minimize delays.

Benefits of a Junior ADU for Homeowners

Junior accessory dwelling units (ADUs) offer unique advantages for homeowners in Long Beach. These smaller living spaces can enhance property value, provide flexible living arrangements, and incorporate energy-efficient features, making them a smart investment.

Maximizing Property Value

Adding a junior ADU can significantly increase our property value in Long Beach. Properties with ADUs attract a broader market of potential buyers. The additional living space is appealing to families, renters, and investors alike.



With real estate continually evolving, we can capitalize on this trend. Junior ADUs often yield a higher return on investment compared to traditional renovations. Moreover, existing structures are typically converted, saving us time and money on new construction.

Flexible Living Space Options

Junior ADUs are versatile and cater to various lifestyle needs. We can use this space for extended family, visitors, or even as a home office or studio. This flexibility allows us to adapt our living arrangements without the need for a major home overhaul.



In Long Beach, where space can be limited, a junior ADU serves as an efficient solution. It can provide separation while maintaining proximity, fostering independence for family members or guests. We can customize the layout and design to suit our specific requirements.

Energy-Efficient Features

Many junior ADUs incorporate energy-efficient designs and materials. This focus on sustainability not only helps reduce our carbon footprint but also lowers utility bills over time. Features may include energy-efficient appliances, improved insulation, and smart home technology.



As California promotes eco-friendly building practices, we can benefit from potential incentives or rebates. Leveraging energy efficiency adds long-term value while conforming to state regulations and guidelines. It positions our property as modern and environmentally conscious.

Why Partner with Us

We stand out as the top choice for Junior ADU construction due to our proven track record, expert team, and dedication to using high-quality materials. Our commitment to customer satisfaction drives us to provide exceptional service and results that enhance the value of your property.

Experienced Specialists

We specialize in Junior ADU construction, employing a team with extensive knowledge and skills. Our specialists understand the nuances of the building process, from design to permitting. This is crucial in ensuring compliance with California’s building codes. Each member brings unique expertise, allowing us to tackle challenges efficiently.

Proven Track Record 

Our projects speak for themselves. With years of experience in the Long Beach area, we have built a solid reputation based on successful ADU constructions. Over time, we have completed numerous Junior ADUs, each tailored to meet local regulations and client specifications.

High-Quality Materials

We prioritize quality in every aspect of our construction. The materials we use are sourced from reputable suppliers, ensuring durability and aesthetic appeal. We believe using top-tier materials enhances the longevity of our structures. This commitment minimizes the need for future repairs and maintenance, saving our clients time and money.

FAQs on Junior ADU Construction

We understand that building a Junior ADU can raise several questions. Below, we address key concerns regarding financing options available for homeowners.

  • What is a junior ADU and how does it differ from a standard ADU?

    A junior ADU (ADU) is a smaller living unit of up to 500 square feet created within the walls of an existing single-family home. Unlike standard ADUs, junior ADUs must be inside the main dwelling, have an efficient kitchen, and may share bathroom facilities with the primary residence. Standard ADUs can be detached, attached, or converted spaces up to 1,200 square feet with a full kitchen and bathroom.

  • How much does a junior ADU construction cost in Long Beach, CA?

    Junior ADU construction in Long Beach typically costs between $40,000-$85,000, depending on the scope of work. This is significantly less than standard ADUs which can range from $100,000-$300,000. The cost varies based on plumbing needs, kitchen installation complexity, and whether bathroom facilities are shared or newly constructed.

  • Do I need permits for junior ADU construction in Long Beach?

    Yes, you need permits for junior ADU construction in Long Beach. The city follows California state laws requiring streamlined approval for compliant junior ADUs. You'll need building, electrical, plumbing, and possibly mechanical permits. Long Beach has specific requirements but must process compliant applications within 60 days, with reduced fees compared to standard ADUs.

  • What are the size limitations for a junior ADU in California?

    In California, junior ADUs are limited to a maximum of 500 square feet. They must be contained entirely within the walls of an existing single-family residence. This size restriction is standardized across California by state law and applies to all cities including Long Beach.

  • Can I convert part of my house into a junior ADU in Long Beach?

    Yes, you can convert part of your house into a junior ADU in Long Beach. Ideal spaces include converted bedrooms, attached garages (when part of the main house), or other living areas. The space must be within the existing walls of your home, have its own entrance (which can be shared with the main house), and include an efficient kitchen. Bathrooms can be either dedicated to the junior ADU or shared with the main residence.