Comfortable 2 Bedroom ADU for Downsizing in Oceanside
Colusa Drive, Oceanside, CA 92056
Homeowner Story: Downsize to ADU
Special Circumstance: HOA
ADU for Downsizing in the Southridge Estates HOA
This 1,199 sqft ADU in Oceanside uses one of SnapADU’s standard L-shaped floor plans and is located within the Southridge Estates HOA. The homeowners are building the ADU as part of a downsizing plan, allowing them to move into the new home while generating rental income from the primary residence. The result is a flexible setup that supports both long-term living and investment goals.
Learn more about building an ADU in an HOA.
Floor Plan:
2BR/2BA 48×31 L-Shape
Community:
The Oceanside ADU Guide
With more than 15 ADU projects completed or in progress throughout Oceanside, we’ve seen firsthand how the city’s regulations and permitting process compare to other jurisdictions throughout San Diego County.
One of the more unique Oceanside requirements is the building verification survey, which is required as part of the ADU plan review process. This survey confirms that the proposed ADU location complies with setback requirements and is typically prepared alongside a boundary survey. Because this requirement is not common across all jurisdictions, it is important to account for it early when planning an Oceanside ADU project.
We’ve worked on a wide variety of Oceanside ADU projects, including two-story ADUs, carriage house ADUs over garages, rooftop deck ADUs, HOA properties, rental units, homes for aging parents, and flexible living spaces.
Also of note, Oceanside recently updated its ADU ordinance in June 2026 to align with state law.
Oceanside ADU Permitting
Most ADU permits in Oceanside are approved within approximately 3 to 4 months after submission. Properties located within the Coastal Zone generally experience similar permitting timelines, making Oceanside one of the more straightforward coastal jurisdictions for ADU development.
Permit costs typically range from approximately $9-$11 per square foot, which is on par with many neighboring jurisdictions. As with any project, site-specific conditions such as grading, utility upgrades, fire requirements, and survey requirements can influence permitting timelines and overall project costs.
Approximately 15% of our Oceanside projects have been located within the Coastal Zone. Like Encinitas and Carlsbad, Oceanside’s Local Coastal Program has been updated to accommodate California’s ADU laws, meaning most homeowners experience little to no additional time or cost associated with coastal permitting. Learn more about building an ADU in the Coastal Zone.
Oceanside Pre-Approved ADU Program
Per requirements from AB1332, Oceanside offers a pre-approved ADU program. Under this program, ADU plans can be reviewed and pre-approved by the City before being used on individual properties.
However, as of June 2026, Oceanside’s pre-approved ADU library does not yet contain any approved plans. As the program develops, homeowners will see plan options become available as designers submit their plans for pre-approval.
