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How big is an ADU in San Diego?

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Are you planning on building an Accessory Dwelling Unit (ADU) in San Diego and wondering about the size? Edison Home Improvement, the best ADU company in San Diego, is here to help you out with all the information you need.

ADUs are gaining popularity in California due to the housing crisis, and they serve as additional living spaces on a property. ADUs can either be attached or detached, and their sizes depend on various factors.

 What is the Standard ADU Size?

San Diego has regulations on the size of ADUs that homeowners can build. According to the San Diego Municipal Code, ADUs must have a minimum of 150 square feet and cannot exceed the size of the primary residence on the property. This means that the standard size of an ADU in San Diego ranges from 300 square feet to 1200 square feet.

However, there are exceptions to this rule, such as if the property is in high fire hazard zones or if the ADU is designed for disabled persons. In such cases, the ADU must not exceed 1000 square feet.

Factors that Affect ADU Size in San Diego

The size of an ADU can vary depending on factors such as the size of the property, the zoning laws, the homeowner’s budget, and the intended use of the ADU.

Size of the Property

The size of your property plays a significant role in determining the size of your ADU. If you have a large backyard, you can go for a bigger ADU size. On the other hand, if your property is small, you might be limited to a smaller ADU size.

Zoning Laws

Zoning laws vary between different cities, and they determine the maximum size and location of an ADU. In San Diego, the ADU size cannot exceed the size of the primary residence on the property.


Another significant factor is the homeowner’s budget. The bigger the ADU, the more expensive it will be to build. Homeowners must consider their budget before deciding on the ADU size.

Intended Use

The intended use of the ADU also plays a role in the size. If you’re building an ADU for personal use, you might need a smaller size compared to if you’re building it for rental purposes.

Why Should You Choose Edison Home Improvement as Your ADU Company in San Diego?

Choosing the right ADU company to build your ADU is crucial. Edison Home Improvement is the best ADU company in San Diego, and we have a team of experts who will ensure that your ADU is built to your expectations.

We understand the importance of design and functionality when it comes to building an ADU. Our team will work with you to come up with a customized design that fits your needs.

Not only do we focus on design, but we also ensure that all our ADUs meet the required regulations and codes. With Edison Home Improvement, you can be sure that your ADU will be up to standard and will meet all the necessary regulations.

In conclusion, the size of an ADU in San Diego depends on various factors, such as zoning laws, the size of the property, the intended use, and the homeowner’s budget. At Edison Home Improvement, we understand the importance of getting the size right, and we will work with you to ensure that your ADU meets your needs. Choose Edison Home Improvement, the best ADU company in San Diego, for all your ADU needs.


With over a decade of experience, our team of designers and contractors are confident we can turn your dreams into a reality. With no obligation, we are happy to discuss your home renovation needs and help come up with perfect solutions that fit your budget.

You dream it. We build it. You live it.

Call us today for your free consultation! Sunday appointments are available.

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Questions? Please call us at your earliest convenience: (619) 373-9948

Contact Information

Head Office
​2801 Camino Del Rio S, Suite 318-4
San Diego, CA 92108
Tel: 619-373-9948

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Monday- Friday 9:00AM – 6:00PM
Sunday By Appointment Only

For Scheduling Free Estimates:
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