Attached Garage Conversion Cost across San Diego County
Attached garage conversions in San Diego County tend to land toward the lower and middle end of the overall $40,000-$150,000 range because the garage is already close to the main home's electrical panel and plumbing lines, which shortens the most expensive parts of the job.
What moves the price
- Shared wall condition (fire-rated drywall requirement)
- Distance from the attached garage to existing plumbing stacks
- Whether the main electrical panel has spare capacity for a subpanel
- Conversion type chosen (bedroom vs. JADU vs. full ADU)
What's included
- Fire-rated drywall at the shared wall where required
- Plumbing tie-in to the nearest existing line
- Electrical subpanel or circuit extension from the main panel
- Insulation, flooring, and exterior wall infill
Common questions
Is an attached garage conversion always cheaper than detached?
Usually, because plumbing and electrical connections are shorter, but the shared wall does require fire-rated drywall and sometimes a rated door, which is an added cost that a detached conversion does not have.
Can an attached garage still become a full ADU?
Yes, as long as it meets California ADU law requirements for a separate entry, kitchen, and bathroom. Many full ADU conversions in San Diego County are attached garages.
Does the interior door to the house need to be removed for an ADU?
For a full ADU with independent entry and utilities, the interior connecting door is typically sealed or removed to establish the unit as a separate dwelling. A JADU can often keep an interior connecting door under California JADU law.
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