ADU Space Optimization and Layout Planning

Transform your Long Beach property's potential with our expert detached ADU construction services. At Modern ADU Builder & Garage Conversions, we specialize in creating standalone dwelling units that maximize your property's value while providing flexible living solutions tailored to Southern California's unique lifestyle needs.


Our comprehensive detached ADU construction process begins with personalized planning to determine the ideal size, placement, and design for your specific property. Unlike attached ADUs or garage conversions, detached units offer complete architectural freedom, allowing us to create distinctive spaces with optimal privacy, natural lighting, and seamless indoor-outdoor flow.


Each detached ADU we build combines functional efficiency with architectural harmony, ensuring your new structure enhances your property's overall aesthetic while providing a fully independent living space. 


From foundation to finishing touches, we handle every aspect of your detached ADU project with meticulous attention to detail. Our streamlined construction process typically completes new detached ADUs in 4-7 months, minimizing disruption to your primary residence while creating lasting value.


Whether you're seeking rental income, accommodations for family members, or expanding your own living space, our detached ADU construction services deliver durable, beautiful structures that stand the test of time while providing immediate property value enhancement and potential rental returns.

Our Construction Process

Our process for constructing detached ADUs is designed to be efficient and transparent. We prioritize clear communication and set expectations to ensure a smooth journey from consultation to completion.

  • 1. Initial Consultation

    We begin with an initial consultation to discuss ideas and specific needs for your detached ADU. During this meeting, we review budget, design preferences, and any zoning regulations that may apply in Long Beach, CA.


    Following this, we conduct a thorough site evaluation. This step is crucial for assessing space constraints, access requirements, and potential utility connections.


    Our team takes detailed measurements and photographs of the site. This information helps us create accurate designs tailored to your property while ensuring compliance with local regulations.

  • 2. Construction Phases and Milestones

    Once the design is finalized, we move into the construction phase. This phase can be divided into several key milestones:


    • Foundation Work: Setting a solid foundation is essential for durability. We ensure that the groundwork meets all building codes.
    • Framing: During this stage, we construct the basic frame of your ADU. We prioritize structural integrity and functionality.
    • Utilities Installation: Our team carefully installs plumbing, electrical, and HVAC systems, adhering to industry standards.
    • Interior and Exterior Finishing: This final phase includes detailed work on fixtures, cabinetry, exterior siding, and landscaping.

  • 3. Final Walkthrough and Handover

    Upon completing construction, we conduct a final walkthrough with you. This ensures that all aspects of the project meet your expectations.


    During this walkthrough, we will review each part of the ADU, discussing features and functionality. We encourage your feedback, as it helps us address any last-minute adjustments.


    Once we receive your approval, we hand over the keys to your new detached ADU. At this point, you’ll also receive any necessary documentation, including warranties and maintenance guidelines. 

    This ensures you feel comfortable and confident in your new space.


Our Construction Services

We offer a range of specialized services for detached ADU construction, ensuring a seamless experience from concept to completion. Our focus is on personalized design, efficient permitting, and high-quality construction tailored to meet our clients' needs.

Comprehensive Design-Build Process

Our design-build process integrates both design and construction phases for maximum efficiency. We collaborate closely with clients to identify their needs and preferences. This cohesive approach allows us to maintain clear communication and streamline project timelines.



We start with an initial consultation to discuss ideas and budget. Our team then develops detailed design plans that reflect your vision while adhering to local regulations. This not only ensures aesthetic appeal but also functional livability.

Custom Floor Plans and Layouts

We create custom floor plans that make the best use of available space on your property. Our designs consider factors such as the intended use of the ADU, family size, and future needs.



Each layout is tailored to suit your lifestyle, whether you envision a cozy guest suite or a fully functional rental unit. We prioritize functionality without sacrificing style, offering a variety of options in terms of square footage and architectural features.

Permit Acquisition

Navigating the permitting process can be daunting. Our experienced team handles all aspects of permit acquisition and city approvals, ensuring compliance with local codes.



We prepare the necessary documentation and submit applications on your behalf, saving you time and reducing stress. Our knowledge of local regulations means we can identify potential hurdles early, allowing for smoother project progression.

Why Work with Us

We stand out in the ADU construction industry due to our local expertise, commitment to quality, and client-centric approach. Here are the key reasons why we are the right choice for your detached ADU project.

Experienced ADU Specialists

Our team comprises experienced professionals who specialize in detached ADUs. Located in Long Beach, CA, we understand local building regulations and community needs. We leverage our knowledge of the area to navigate zoning laws and ensure compliance. Our expertise not only speeds up the permitting process but also minimizes potential setbacks.

Quality Craftsmanship

Quality is our top priority. We utilize premium materials and collaborate with skilled craftsmen to ensure each project meets the highest standards. Our construction methods prioritize durability and sustainability. This approach results in ADUs that are not only attractive but also energy-efficient, promoting long-term savings.

Client-Centered Approach

We believe that communication is key to a successful build. Our client-focused project management ensures you remain informed at every stage of your ADU construction. From the initial consultation to project completion, we engage you in the process. This collaborative approach allows us to address your needs and concerns effectively.

FAQs on Detached ADU Construction

We understand that constructing a detached ADU can raise many questions. Our aim is to provide clear answers to help you navigate the process smoothly.

  • How much does it cost to build a detached ADU in Long Beach?

    Building a detached ADU in Long Beach typically costs between $300-400 per square foot. For a standard 700-800 square foot detached ADU, expect to invest $210,000-320,000. This includes foundation work, framing, roofing, electrical, plumbing, finishes, and standard appliances. Factors affecting cost include design complexity, material quality, site conditions, and utility connection requirements. Premium finishes, custom designs, or challenging lot conditions can push costs higher. 

  • What permits do I need for a detached ADU in Long Beach?

    For a detached ADU in Long Beach, you'll need a building permit, which encompasses several specific permits under one application through the Development Services Department. This includes structural/architectural approval, electrical permit, plumbing permit, and mechanical permit. You may also need a grading permit if significant earth movement is required. The city conducts plan check reviews for zoning compliance, building code requirements, fire safety, and energy efficiency standards. Permit fees typically range from $8,000-15,000 depending on project scope.

  • How long does it take to build a detached ADU from start to finish?

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  • What's the minimum lot size required for a detached ADU in Long Beach?

    Long Beach no longer enforces a minimum lot size requirement for building a detached ADU. Under updated California ADU laws adopted by Long Beach, you can build a detached ADU regardless of lot size as long as you can meet other requirements. These include maintaining minimum setbacks (4 feet from side and rear property lines), staying within maximum size limitations (1,200 square feet or 50% of primary dwelling size, whichever is less), and ensuring adequate space remains for any required parking.

  • Can I build a two-story detached ADU on my property?

    Yes, you can build a two-story detached ADU in Long Beach. The maximum allowed height is 16 feet, but this can be increased to 25 feet if the detached ADU is within a half-mile walking distance of public transit or when the ADU is built over an existing garage. Two-story designs must comply with all setback requirements and privacy considerations, particularly for second-floor windows overlooking neighboring properties. Building a two-story ADU can maximize your living space while maintaining yard area.