Building Homes For Every Journey Starts With OneStop ADU!
OneStop ADU offers a turnkey solution for homeowners ready to build an ADU in San Diego County.
About Us
Who We Are
OneStop ADU is your trusted partner for creating custom ADUs. We offer turnkey solutions, including six pre-designed floor plans, permitting, financing coordination, and quality construction.
Our ADA-compliant units are designed with accessibility in mind, and we provide three exterior styles: Contemporary, Craftsman, and Spanish/Mediterranean.
Our in-house licensed team has 25+ years of experience in home and multi-family construction, ensuring high-quality, traditionally built units. We also work with trusted lenders to simplify financing options.
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Plans & Designs
6 floorplans to inspire you — and the flexibility to build a custom ADU tailored to you.
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What Sets Us Apart
Our OneStop ADU team will meet with you to understand your vision and provide a basic feasibility study at no charge and with no obligation.
Our pre-designed floorplans range from a 400 sq ft studio to a 1,200 sq ft four-bedroom option.
Explore our unique exteriors designed in Contemporary, Craftsman & Spanish/Mediterranean styles.
We did all the leg work! Pre-selected designer finishes create a cohesive look for your new backyard home.
OneStop ADU has the knowledge and experience to handle the daunting permitting process on your behalf.
Our in-house licensed building team has over 25-years experience constructing homes and multi-family projects.
OneStop ADU will manage your project from inception to finished product helping to ensure a smooth process.
We have teamed up with some of the top San Diego lenders to help match you to the best loan programs available.
Let’s bring your vision to life – book a discovery call!
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Completed Projects
Our portfolio showcases a range of completed projects that highlight our commitment to quality, thoughtful design, and reliable execution. Each project represents a unique challenge and a tailored solution—whether it’s a custom ADU, a full home renovation, or a modern website design. Explore these finished works to see how we bring ideas to life and deliver results that stand the test of time.
About Us
OneStop ADU clients will also enjoy these bonus inclusions:
Included for our 6 pre-designed plans with signed contract
Provided for no charge at initial in-person consultation
Included as specified for our 6 pre-designed plans with signed contract
Included with signed contract
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Your ADU Solution Across San Diego County
At One Stop ADU, we provide full-service ADU design, permitting, and construction across San Diego County. Whether you’re looking to build an ADU, convert your existing space, or add an extension, we have you covered. Our expertise spans all areas of the county, including:
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Frequently Asked Questions
How to Find a Good ADU Contractor
The best way to find a good ADU contractor is to rely on OneStop ADU, a company dedicated to delivering top-quality accessory dwelling units. OneStop ADU provides full-service support, from design and permitting to construction, ensuring every step is handled with expertise. By choosing OneStop ADU, you gain peace of mind knowing your project is managed by experienced professionals who prioritize quality and customer satisfaction.
What Is an ADU Builder
An ADU builder is a professional or company that specializes in designing and constructing accessory dwelling units. OneStop ADU serves as a trusted ADU builder, managing the entire process from planning and permitting to final construction. By working with OneStop ADU, homeowners can ensure their ADU project is completed efficiently, legally, and to the highest quality standards.
How Big Can an ADU Be in California
In California, a detached ADU can be up to 1,200 sq ft, while an attached ADU can be up to 50% of the primary residence’s living area but not more than 1,200 sq ft. A Junior ADU (JADU) is limited to 500 sq ft. Local cities and counties may have stricter regulations, so it’s important to review specific local zoning rules before starting your project with OneStop ADU.
How Long Does It Take to Build an ADU
The best way to find a good ADU contractor is to rely on OneStop ADU, a company dedicated to delivering top-quality accessory dwelling units. OneStop ADU provides full-service support, from design and permitting to construction, ensuring every step is handled with expertise. By choosing OneStop ADU, you gain peace of mind knowing your project is managed by experienced professionals who prioritize quality and customer satisfaction.
Can an ADU Be a Primary Residence
Yes, an ADU can be used as a primary residence, though this depends on local ordinances and the specific ADU type, since regulations vary by location. While many ADUs are built for family members, they can also serve as a homeowner’s main dwelling if they meet all legal requirements for independent living facilities. OneStop ADU ensures every project complies with local zoning and housing codes, making your ADU a fully legal and comfortable option for primary living.
What Is an ADU Building
An ADU building refers to the structure of an accessory dwelling unit, which is a self-contained residential space located on the same lot as a primary home. OneStop ADU specializes in designing and constructing these units to meet local building codes, offering complete functionality with a kitchen, bathroom, living area, and private entrance. By working with OneStop ADU, homeowners can ensure their ADU is built efficiently, legally, and to the highest standards.
Can You Build an ADU Before the Main House
Yes, in some locations you can build an ADU before the main house, but this depends heavily on local zoning laws, setback requirements, and property-specific conditions. While California state law has made ADUs more accessible, each city or county may impose restrictions on when and how they can be constructed. OneStop ADU helps homeowners navigate these rules, ensuring the project complies with local regulations and is approved without costly delays.
How Many ADUs Can You Have
In California, most single-family lots are allowed to have one full-size ADU and one Junior ADU (JADU), giving a maximum of two units in addition to the main home. For multifamily properties, recent state law changes allow the construction of up to 8 detached ADUs, provided this number does not exceed the count of existing units, plus the option to convert non-living spaces (like garages or storage rooms) into ADUs totaling up to 25% of existing units. OneStop ADU helps homeowners and property owners navigate these rules, ensuring they maximize their property’s potential while staying compliant with local and state regulations.
About Us
Innovating ADU Design
Why choose a design-build ADU contractor?
Building an ADU is a big and complicated project – but it doesn’t have to be like that. When you work with a general contractor, you get a team that handles everything from start to finish: design, permits, and construction. You don’t have to handle communication with countless architects, engineers, and builders.
It’s faster and often more affordable. You just think of what you want and we’ll take care of the rest.
Our Services
At our construction company, we offer a full range of services to help you expand and improve your home. We manage everything – ADU designs, permits, construction, and final touches. We work closely with you to make sure your new unit fits your needs and budget. Here are the services we offer in San Diego.
ADU Construction
We provide ADU construction in San Diego. Are you planning a rental unit, guest suite, or extra room for family? We handle everything – design, permits, building, and final inspection. With pre-approved plans and experienced ADU contractors, we keep your project simple, compliant, and on schedule.
Custom ADU
Maybe you want a fully unique ADU? We can help you bring it to life with a fully custom design. Our ADU contractor team will create a layout that fits your property, style, and how you plan to use your new ADU. We handle everything – including permits, drawings, and construction. A custom ADU takes more time, effort, and usually money than pre-designed plans, but it gives you absolute freedom to build exactly what you want.
Garage Conversion
If you’re not using your garage much, converting it into a livable space is a smart choice. We transform garages into comfortable ADUs complete with a bathroom, kitchen, and everything needed for everyday living. Our ADU construction company takes care of the plans, permits, and construction so the process is hassle-free for you.
Room Additions
We build custom room additions that give you more space without the need to move. Are you adding a bedroom, expanding your kitchen, or building a quiet home office? We make sure your new ADU fits your home and your lifestyle perfectly. Our team handles everything – design, permits, and construction. So the process is smooth and stress-free on your side. A well-planned room addition not only gives you extra space but also increases the value of your property.
Custom Homes
We build custom homes with nothing but your needs and preferences in mind. Do you already have ideas or starting from scratch? We’ll work with you to create and construct a home that fits you perfectly. You choose the layout, style, materials, and finishes – we handle the plans, permits, and construction. With us you’ll get a high-quality, fully personalized home.
New Home Construction
We also build new homes from the ground up. Our ADU company works closely with you to create a house that fits your needs and preferences, while also handling permits, planning, and construction. You’ll have an experienced crew managing the entire process, so everything stays on schedule and on budget. We make sure your new home is built right.
Home Remodeling
We help people update and improve their houses with high-quality remodeling services. That might mean opening up a living room, modernizing a kitchen, or upgrading bathrooms. Our ADU company handles design, permits, and construction. We also provide clear communication and honest pricing. We make the remodeling process smooth and stress-free.
Kitchen Remodeling
We remodel kitchens to make them more practical and better suited to your needs. That might include new cabinets, updated countertops, better lighting, or more space. Our team helps you choose materials, plan the design, and handle all the construction work with care and professionalism. A well-designed kitchen doesn’t just look better – it makes cooking and cleaning up easier. We keep the process simple so you get the kitchen you’ve been wanting without any stress and hassle.
Bathroom Remodeling
We remodel bathrooms to make them more comfortable and easier to use. That could mean updating old fixtures, improving lighting, replacing tile, or reworking the layout. Our team helps you plan a bathroom that fits your style and handles everything – design, permits, and construction. A well-designed bathroom can make everyday things like bathing or taking a shower smoother and add real value to your home.
Build Your Dream ADU with the Top ADU Company in San Diego!
At OneStop ADU, our ADU builders easily turn your backyard into something useful. Our experienced team handles everything – design, permits, construction, and final inspection. No hassle, no stress. Just a process refined by years of experience to deliver high-quality results. Whatever you reason to get an ADU is, we’ll make sure you get an ADU of your dreams.
Schedule your free consultation with our ADU builders today and let’s bring your plans to life.
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