ADU builder near me

aDU Builder Near Me in San Diego, CA.

ADU Builder Near Me

Make Your ADU Building Process As Easy As Possible!

Are you looking to add an Accessory Dwelling Unit (ADU) to your property in San Diego, CA? Look no further! We are the premier ADU builder near you, specializing in designing and constructing high-quality ADUs that meet your specific needs and requirements. 

Our team of experienced professionals is dedicated to making your ADU building process as seamless and hassle-free as possible. From initial design and permit acquisition to construction and finishing touches, we handle every step with precision and attention to detail. Trust us to deliver an ADU that not only enhances the value of your property but also provides a comfortable and functional living space. Contact us today to get started on your ADU journey!



Unlock the full potential of your home with our expert design services. We believe that a great outcome begins with meticulous planning and design that takes into account your individual style and preferences, guaranteeing a space that truly reflects who you are.



Leave the paperwork to us! Our experienced team will handle the necessary permits and approvals, ensuring a smooth and hassle-free construction process.



As an experienced general contractor, we stand behind our work, providing outstanding craftsmanship in every aspect of your ADU building process, from materials to installation, resulting in exceptional performance and long-lasting results that you can rely on.

ADU Builder Near Me in San Diego - Affordable and Reliable


The key to a successful ADU design is combining all the elements of functionality, desires, and legality into one magnificent plan. We understand that ADU regulations may seem to be complex, but don’t you worry. As an experienced design-build firm, we are well-prepared to simplify the process for you by handling all aspects of the project, including design, permits, and construction. Whether you want to convert that area into a home office, a kids’ playroom, a gym, or even a home theater, Y9 Construction has the experience and knowledge to get the job done

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Take the first step towards your ADU dream by contacting us today

Different types of ADUs:

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Garage conversion

Garage conversions provide a cost-effective solution for homeowners seeking to expand their living space without undergoing new construction, making them a popular choice for adding an ADU to a property. Depending on the garage’s configuration, it can be converted into either an attached or detached ADU. It’s important to note that the converted space will generally adhere to the garage’s original blueprints. Consequently, garage conversions are typically more affordable compared to constructing an entirely new unit from scratch.

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Above a garage

While the concept of an accessory dwelling unit (ADU) above the garage might seem similar to a garage conversion, it often involves additional complexities. For example, most garages lack sufficient structural support to accommodate a second floor. In many cases, reinforcing the garage to bear the weight of an additional level can be quite costly. Consequently, many homeowners choose to demolish the existing garage and construct a new unit from scratch.

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Detached new construction

Detached ADUs, also known as standalone ADUs, are accessory dwelling units that are separate structures from the primary residence. They are constructed as independent units on the same property but are not physically connected to the main house. Detached ADUs can take various forms, such as a small cottage, a converted garage, or a purpose-built structure. They offer greater privacy and separation from the main house, making them an attractive option for extended family members, guests, or as rental units.

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Bump out

A bump-out ADU is an internal conversion of the main residence. The best way to imagine it is as an extension that shares a wall with the primary house. This ADU option is commonly chosen in cases where a garage is not available for conversion.


Attic conversion

An attic conversion refers to the process of transforming an attic space into a livable and functional accessory dwelling unit (ADU). It involves renovating and modifying the attic to meet the necessary building codes and requirements for residential occupancy. This conversion typically includes adding insulation, proper ventilation, windows, flooring, electrical wiring, and plumbing to create a self-contained living space within the attic. The attic ADU can serve as an additional dwelling unit for rental purposes

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Interior ADUs

Interior ADUs, also known as internal ADUs, are accessory dwelling units that are located within the existing interior space of a primary residence. Rather than being separate structures or conversions of external spaces like garages or attics, interior ADUs are created by repurposing existing rooms or areas within the main house. This can include converting basements, unused rooms, or even dividing larger rooms into separate living spaces. Interior ADUs offer a convenient and space-efficient solution for adding additional housing units within the primary residence, allowing for multigenerational living, rental income, or flexible living arrangements. These units typically have their own entrance, kitchen, bathroom, and living area, ensuring privacy and independence for the occupants.

Get a Free Estimate for Your ADU Project Today!

Contact us today to discuss your ADU project in San Diego, CA. Our team of experts is ready to guide you through the entire process, from initial design concepts to the final construction stages. As the leading ADU builder near you, we are committed to making your ADU vision a reality.