Owner Occupancy
Application Review
Building departments have been required to respond to a granny flat application within 60 days substantially reducing time for final approvals. This limit used to be 120 days for the initial review. We want to make it easy for you! OneStop ADU‘s team takes your project through the permitting process at no additional cost.
HOAs
HOAs (Homeowners Associations) and CC&Rs (Covenants, Conditions & Restrictions) cannot prohibit development of backyard homes. We offer three finish options- Contemporary, Craftsman and Spanish/Mediterranean to easily comply with requirements for specific exterior styling.
Fees
OneStop ADU is educated on the crucial thresholds for square footage that will trigger higher costs such as sewer connection and impact fees. To encourage homeowners to build casitas, many development fees have been waived.
Multifamily
Recent 2020 California law allows a companion unit to be added to certain multi-family zoned properties. This law allows for a maximum of 2 ADUs per property with an existing multiple unit structure. The added units can be within one structure or constructed as independent ADUs.
Understanding these regulations is crucial for a smooth ADU project.
Size & Setbacks
No minimum lot size required in CA. Local municipalities are allowed to pass additional regulations but must allow a companion unit of less than 850 sq ft or may set a maximum of 1000 sq ft for ADUs with 1 or more bedrooms with only 4 feet side and rear setbacks.
Parking
There are no parking requirements for properties located in a “transit priority zone” (within 1/2 mile of public transit). Certain jurisdictions may require one spot per backyard home while others may waive these requirements.
Solar
According to updated guidance from the HCD (California Department of Housing and Community Development), solar power is required for all newly built, non-manufactured detached ADUs as per Title 24. Per the California Energy Commission (CEC), the panels can be installed on the ADU or on the primary dwelling unit. Unlike most others in the industry, OneStop ADU includes the cost of solar in our construction price for your ADU based on requirements for Climate Zone 7.
By understanding these frequently asked questions, you can better navigate the process of building an ADU in San Diego County. If you have more questions or need personalized assistance, consider reaching out to our experts at OneStop ADU.

Scripps Ranch ADU Regulations & Permits
Building an ADU in Scripps Ranch: Your Guide to Expanding Your Home the Smart Way Table of Contents Nestled in the rolling hills of northeastern San Diego, Scripps Ranch is a sought-after neighborhood known for its tree-lined streets, family-friendly vibe,

Poway ADU Regulations & Permits
Building an ADU in Poway: A Smart Investment for Your Home Table of Contents Located in the heart of San Diego County, Poway offers a unique blend of suburban tranquility and urban convenience. Known as “The City in the Country,”