Modular ADU Installation

Transform your property with the efficiency and elegance of modular accessory dwelling units. At Modern ADU Builder & Garage Conversions, we're revolutionizing living spaces across Long Beach with factory-built precision that outperforms traditional construction methods while maintaining exceptional quality.


Our modular ADUs combine streamlined installation with customizable designs, creating the perfect solution for maximizing your property's potential. Whether you're seeking rental income, accommodating family members, or creating a home office, our factory-crafted units deliver superior construction in half the time of conventional methods.


The Modern ADU difference lies in our comprehensive approach to modular ADU installation. We handle everything: from initial property assessment and design selection to permitting, site preparation, and final utility connections. Our experienced team navigates Long Beach's specific requirements while ensuring your modular ADU perfectly complements your existing property aesthetics.


With installation timeframes of just 3-5 months compared to traditional 9-12 month construction periods, our modular approach minimizes disruption while delivering exceptional quality. Your new space arrives ready for efficient assembly on your prepared foundation, with precise engineering and quality control that exceeds on-site construction standards.


Experience the perfect blend of innovation, efficiency, and craftsmanship with Modern ADU Builder & Garage Conversions. Our modular ADU solutions provide predictable costs, accelerated timelines, and superior energy efficiency.

Features and Benefits of Modular ADUs

Modular ADUs offer numerous advantages that enhance both sustainability and convenience. We focus on three key areas: sustainable building materials, energy efficiency, and flexible floor plans. These aspects not only promote a positive living environment but also meet the diverse needs of homeowners.

Sustainable Building Materials


We prioritize using sustainable building materials in our Modular ADUs. This commitment ensures lower environmental impact compared to traditional construction methods.


Common materials include:


  • Recycled Steel: Durable and reduces waste.
  • Bamboo Flooring: Fast-growing and renewable.
  • Low-VOC Paints: Improves indoor air quality.


Choosing these materials helps us create structures that are not only aesthetically pleasing but also environmentally responsible. Our approach minimizes carbon footprints and encourages a greener lifestyle for our clients.


Energy Efficiency


Energy efficiency is a cornerstone of our modular designs. We integrate advanced technology and smart solutions to enhance energy use.


Key features include:


  • High-Performance Insulation: Reduces heating and cooling costs.
  • Energy-Efficient Windows: Minimizes heat loss and gain.
  • LED Lighting: Consumes less energy compared to traditional options.


These elements work together to lower utility bills, promoting long-term savings. Furthermore, energy-efficient systems contribute to a healthier environment by lowering greenhouse gas emissions.


Flexible Floor Plans


Flexibility is one of the standout benefits of Modular ADUs. Our designs can adapt to various needs and preferences, offering tailored solutions for our clients.


Options include:


  • Custom Configurations: To suit specific site layouts.
  • Multi-Use Spaces: Rooms can serve dual purposes.
  • Expandable Designs: We accommodate future growth.


This adaptability allows us to create spaces that fit families’ lifestyles, whether for guests, home offices, or rental opportunities.

Our Installation Services

We offer specialized modular ADU installation services tailored for homeowners in Long Beach. Our comprehensive approach ensures that we address every aspect of the installation process, from design to construction.

Custom Design and Planning

Our custom design and planning process begins with understanding the unique needs of each client. We collaborate closely with you to create a design that complements your property while adhering to local zoning regulations.



We utilize state-of-the-art software to visualize the ADU before construction begins. This allows adjustments to be made early in the process, ensuring that your vision is realized. Our experienced team takes into account factors such as family size, intended use, and aesthetic preferences during this phase.

Site Preparation and Permitting

Site preparation is a crucial step in the modular ADU installation process. We assess your property for suitability, evaluating factors like access, environmental concerns, and existing infrastructure.


Our team handles all necessary permitting, working closely with local authorities to ensure compliance with regulations. This streamlines the process, minimizes delays, and alleviates the burden on homeowners. Proper site preparation ensures that the foundation is solid and ready for our modular units, which is vital for longevity and stability.

Efficient Construction

We pride ourselves on our efficient construction process, which minimizes disruption to your daily life. With modular construction, many aspects are completed off-site, reducing the time spent on your property.



Once the modules are ready, we coordinate the timely delivery and assembly of your ADU. Our experienced team ensures that all components fit perfectly, maintaining high-quality standards throughout. We prioritize communication, updating you regularly on progress and addressing any concerns that arise promptly.

Why Partner with Us

We take pride in our reputation and dedication to delivering top-tier modular ADU installations. Our team focuses on specific strengths that set us apart in the industry, ensuring a seamless and efficient experience for our clients.

Experienced Specialists

Our team consists of skilled professionals with extensive experience in the ADU installation process. Living and working in Long Beach, we understand the local zoning laws, building codes, and community standards that impact your project. This local knowledge allows us to navigate challenges effectively and ensure compliance at every step.

Commitment to Quality

Quality and safety are non-negotiable priorities for us. We utilize high-quality materials and modern techniques to ensure that every installation meets stringent safety standards. Our projects are built to last, and we believe in doing things right the first time. To maintain our high standards, we conduct regular inspections throughout the installation process.

Transparent Pricing

We understand that budgeting is crucial for our clients. That’s why we provide clear and transparent pricing without hidden fees. Our detailed estimates break down all costs associated with your modular ADU installation. Before starting a project, we communicate openly about the scope of work and any potential additional costs that may arise.

FAQs on Modular ADU Installation

As we guide clients through the process of Modular ADU installation, it's important to address common queries. Here, we outline the specific steps involved in the installation for clarity and understanding.

  • What is a modular ADU and how does it differ from traditional ADUs?

    A modular ADU is a prefabricated accessory dwelling unit built in sections (modules) in a factory, then transported to and assembled on your property. Unlike traditional stick-built ADUs constructed entirely on-site from the ground up, modular ADUs are built under controlled factory conditions to precise specifications, then delivered and installed on a prepared foundation. 

  • How much does modular ADU installation cost in Long Beach, CA?

    Modular ADU installation in Long Beach typically costs between $90,000-$200,000, depending on size, design complexity, and finishes. This includes the unit itself ($60,000-$150,000), site preparation, foundation work ($10,000-$20,000), utility connections ($5,000-$15,000), and permits ($3,000-$8,000). While the per-square-foot cost may be comparable to traditional construction, the overall project often comes in 10-20% lower due to reduced labor hours on-site and minimal weather delays.

  • How long does it take to install a modular ADU in Long Beach?

    The total timeline for modular ADU installation in Long Beach is typically 3-5 months from start to finish, significantly faster than traditional construction which can take 9-12 months. This includes 4-6 weeks for permitting, 6-10 weeks for factory construction of the modules, 2-3 weeks for site preparation and foundation work, and 1-2 weeks for on-site installation and finishing. Weather delays have minimal impact since most construction occurs indoors.

  • Do modular ADUs require the same permits as traditional ADUs in Long Beach?

    Yes, modular ADUs require the same permits as traditional ADUs in Long Beach. You'll need building permits, plumbing permits, electrical permits, and potentially grading permits depending on your site. The modular units must meet or exceed all California Building Code requirements and Long Beach municipal codes. The permitting process is identical, though approval may sometimes be faster because factory-built units come with pre-approved plans and engineering specifications.

  • What are the advantages of choosing a modular ADU over traditional construction?

    Advantages of choosing a modular ADU include: significantly faster completion time (50-60% quicker than traditional construction); more predictable costs with fewer surprise expenses; higher quality control due to factory construction; reduced on-site disruption to your property; better energy efficiency from precision manufacturing; greater material efficiency with less waste; weather-independent construction timeline; and potential for future relocation if designed with that capability. Modular construction also typically offers simplified design selection through established floor plans, though customization options are still available.