ADU & Garage Conversions in Bellflower, CA: Turn Unused Areas into Profitable Spaces
At Modern ADU Builder & Garage Conversions, we help you turn unused areas into functional living spaces that meet your needs in this growing city of 79,190 residents (as of 2020). We specialize in creating custom ADUs and garage conversions that add value and comfort to your property in one of California's most densely populated cities, ranking 65th nationwide and 8th in the state for population density.
We understand that every project is different, so we work closely with you through the process, from planning to permits and construction. Our goal is to deliver efficient, stylish results that fit your lifestyle and budget in Bellflower's 6.2 square mile area. When you choose us, you get a team experienced in managing local rules and building standards to make the process smooth for you in a city with a rich history dating back to Spanish land grants in 1784.
With the rising demand for extra living space in a community where the average household size is 3.21 people and average family size is 3.67, now is a great time to explore what an ADU or garage conversion can do for your home. Whether you want a rental unit, office, or guest suite, we're ready to help you make it happen with quality and care.

Types of ADU & Garage Conversion Projects
When you want to add living space, there are several clear paths that fit different needs and properties. Each project type changes the use of space in specific ways, helping you maximize value and function while meeting local rules.
Detached ADU Conversions
Detached ADUs are separate structures from your main home. These could be new builds in your backyard or transforming existing accessory buildings into full living units. With space separated from your primary residence, you get privacy and independence for renters or family members.
These projects often require attention to things like utility hookups, parking, and outdoor access. We work with you to make sure all zoning and permit requirements in Bellflower are met. Since detached ADUs are standalone, design options can range widely based on your lot size and budget in a city where 41.6% of residents live in owner-occupied housing and 57.4% live in rental housing.
Attached ADU Transformations
Attached ADUs are connected to your main residence but have a private entrance. These might involve expanding or remodeling part of the house, such as a wing or side room, to create a self-contained unit. This option keeps utility connections simpler and can be more cost-effective than detached units. It also allows you to enhance your home's footprint without using additional yard space.
Our approach helps balance privacy with easy access, so you have a comfortable space for guests or renters without changing your whole layout in an area originally known as "The Willows" and "The Wilderness" due to its natural landscape before development.
Full Garage to Living Space Remodels
Turning a garage into a living area is a popular choice for adding space quickly. We focus on converting your attached or detached garage into a fully functional ADU by installing insulation, plumbing, and appropriate living amenities. Because garages usually have existing foundations and some utilities, this conversion can be faster and more affordable.
But we make sure to address challenges like ventilation, natural light, and building code compliance. The goal is to give you a comfortable, legal living space that blends well with your home in a community that was transformed from an agricultural center to a residential suburb after its incorporation in 1957.
Design and Customization Options
When building or converting an ADU with us, you'll have plenty of ways to make the space fit your needs. From picking floor layouts that work for your lifestyle to choosing finishes that match your taste, every detail is customizable. We also focus on adding energy-saving features to help lower costs and reduce your environmental impact.
Floor Plan Choices
We offer a variety of floor plans designed to maximize space and function. Whether you want a studio layout, one-bedroom, or a design with a separate living and sleeping area, we can tailor the plan to fit your property and goals.
You can choose open-concept designs for a brighter, roomier feel or segmented spaces for more privacy. We also consider storage options and accessibility features so the layout works well for everyone in your household or future tenants in a city that has seen steady population growth from 45,909 residents in 1960 to 79,190 in 2020.
Interior Finishes and Fixtures
You get to select from quality materials and fixtures to match your style and budget. Options include flooring types like hardwood, tile, or laminate, each offering different looks and durability. For kitchens and bathrooms, we offer choices in cabinets, countertops, and plumbing fixtures.
Lighting can range from simple, energy-saving LED to more decorative options that add character. We also help you decide on paint colors and wall treatments that suit your taste while maintaining the character that has evolved since Bellflower Boulevard was a thriving commercial strip from the 1950s through the late 1960s.
Sustainable and Energy-Efficient Solutions
We include many eco-friendly features in your ADU to lower your utility bills and carbon footprint. This can mean installing energy-efficient windows, insulation, and appliances. Solar panels and tankless water heaters are also options to consider. These upgrades not only save energy but may also increase your property's value.
We help you choose solutions that balance upfront costs with long-term savings in a city conveniently served by the Artesia Freeway (SR-91), San Gabriel River Freeway (I-605), and Century Freeway (I-105), making commuting more efficient for residents.

Financing and Budgeting Your Project
We know that managing costs and finding the right financing are key parts of any ADU or garage conversion project. Being clear about expected expenses and available payment options helps you plan better.
Cost Estimates for ADUs and Garage Conversions
The cost of building or converting an ADU in Bellflower varies by size, design, and materials. On average, you can expect between $100,000 and $200,000 for a standard ADU. Garage conversions usually cost less, often ranging from $50,000 to $120,000 depending on the condition of the space and upgrades needed. Your budget should include:
- Permits and fees, which can vary by location
- Labor and materials, influenced by your design and finishes chosen
- Site work and utility connections, if needed
Unexpected expenses can arise, so setting aside about 10% to 15% of the total for contingencies is wise in a community where the median household income was $49,637 and 17.1% of the population lived below the federal poverty line (as of 2010).
Financing Options
You have several ways to finance your ADU or garage project. These include personal savings, home equity loans, and construction loans.
- Home equity loans offer lower interest rates and longer terms but use your home as collateral.
- Construction loans cover building costs upfront and convert to mortgages once the project is complete.
- Personal loans might be an option for smaller projects but tend to have higher interest rates.
We recommend reviewing your credit and discussing options with a financial advisor to choose what fits your financial situation best. Grants or local government incentives may also be available to help reduce costs in a city where the per capita income was $15,982 according to the 2000 census.
Maximizing Value and Return on Investment
Adding or converting an ADU in Bellflower can boost your property's worth and open new income options. We focus on smart designs and efficient use of space that help you get the most value and make the best financial decisions.
Increasing Property Value
An ADU or garage conversion adds livable square footage, which directly increases your property value. Buyers often see these units as bonus spaces for family or guests, which makes your home more attractive.
In Bellflower's market, homes with legal ADUs usually sell for more than similar homes without them. Quality construction and attention to local building codes can make a big difference.
We help you plan with future resale value in mind, making sure your investment pays off when it's time to sell in a city that has seen property values rise as its population grew from 72,878 in 2000 to 79,190 in 2020.
Potential for Rental Income
You can rent out an ADU as a long-term lease or a short-term rental, creating steady cash flow. Bellflower allows owners to rent ADUs separately, which can help cover mortgage or maintenance costs. We help you design units that appeal to renters, with features like private entrances and functional layouts. This approach maximizes rental potential without sacrificing comfort or privacy for you or tenants.
When done right, your ADU can become a reliable source of income while increasing your home's overall value in a community where 60% of housing units are renter-occupied, creating strong demand for quality rental spaces.
Schedule a Consultation with Modern ADU Builder & Garage Conversions
We make it easy for you to start your ADU or garage conversion project. When you reach out to us, we offer a free consultation to discuss your ideas and goals. This helps us understand exactly what you want and how we can help.
During the consultation, we review your space, answer your questions, and explain the steps involved. We also provide a clear estimate so you know the costs upfront. Here is what you can expect when scheduling with us:
- Free initial consultation
- Detailed project discussion
- Clear cost estimate
- Advice on design and permits
You can contact us by phone or email to set up a time that works best for you. We want to make sure your project fits your needs and budget in a city served by Los Angeles County Metropolitan Transportation Authority, Long Beach Transit, and local Bellflower Bus for convenient transportation options.
Once you schedule with us, we'll guide you through each step—from planning to completion—keeping you informed along the way. Your satisfaction is our priority in this community where the Clifton M. Brakensiek Library, a branch of the County of Los Angeles Public Library, serves as an important resource for residents.

