Accessory Dwelling Unit Specialists in San Diego, CA

We are your complete ADU building plans and permit service in San Diego!

Call 619-823-0728 today to schedule an in-home consultation and suitability assessment where we will explore your options together!

Did you know...?

It is possible to have this project be...

  • detached and free standing on your lot
  • attached to your existing residence
  • built as a 2nd story with separate entry
  • created with a garage conversion

It all starts with your Suitability Assessment. From there we explore your options and see if your property is even eligible for a unit. If you're interested in pursuing it further, we draw up the preliminary plans to provide a reliable cost estimate and present your project to the city. Finally, we have trusted contractors standing by to help get your project completed on time and within the budget!

From start to finish, we're here to help you with the whole process! Give us a call or fill out the form below to get started today!

Project Case Study #1

Lemon Grove / San Diego, CA

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Project Case Study #2

Poway / San Diego, CA

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Project Case Study #3

Rancho Peñasquitos / San Diego, CA

3D Tour

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Why Choose Us?

At ADU Building Plans & Permits, we specialize in:


Performing the detailed research to ensure that your project is compatible with applicable codes in place on your property.


Creating an affordable project design that is appealing to the eye.


We do all the “heavy lifting” taking you through the process leading to the timely issuance of your Building Permit.

Then, when you're ready, we will help you with:


We'll connect you to the best financing options that will be right for your family at competitive rates.


We'll introduce you to California State Licensed Contractors who are reliable, reputable and have a strong track record of finishing projects on time and on budget.

Meet the Team

With over 50 years in the industry, we are ready and able to turn your ideas into reality!

David Probst

Principal & General Contractor

David Probst, San Diego General Contractor

David Probst became a General Contractor over 40 years ago. He designed and built homes on Mt Helix in La Mesa and Coronado Cays, a residential waterfront community.

To date, David has been closely involved in the design and construction of remodeling and property improvements totaling in excess of $35 mil. He is now successfully involved in guiding home owners through the process of designing and obtaining building permits to create an Accessory Dwelling Unit on their property.