Garage conversion ADUs in San Diego County
Turn an underused garage into purposeful residential space within the existing footprint.
Discuss your ADU projectStart with what is already there
Kingstone Building helps homeowners define a garage conversion and coordinate the construction path. Existing-condition review, layout and use planning, design coordination, and construction through completion are part of the service described on the website.
The existing structure, access, utilities, and scope all need review before project pricing can be presented. A garage conversion is a property-specific project.
Compare the two ADU paths
A garage conversion adapts the existing garage footprint. A detached ADU is a separate backyard unit. Kingstone Building offers both; the appropriate approach depends on the property, intended use, and project plan.
Some homeowners explore a garage conversion as an ADU option. Project fit depends on existing conditions and applicable requirements. No property eligibility is determined by this website.
Prepare for the first conversation
Share your property location, intended use, timing, and the scope you have in mind. Kingstone Building begins by identifying what is known and what requires further review.
Read our process, check the service areas, or request a consultation about your garage.
Start with your property.
Request a consultationADU questions before you build
Get clear answers about ADU budgets, timing, permits, and rental planning. For guidance specific to your property, request a consultation.
How much does an ADU cost?
For a detached ADU with standard finishes and straightforward site conditions, use $250,000 to $350,000 as an initial planning budget. The ADU planner calculates a size-specific preliminary construction price, which can fall outside that range. This planning budget excludes major grading, utility upgrades, and agency fees. We confirm final pricing after a property review, confirmed plans, and a written proposal.
What is the typical ADU timeline?
Plan for about 12 months: three months for planning and design, three for permit review, and six for construction. The final schedule depends on your property, project scope, and approvals.
What permits are needed for an ADU in San Diego?
The permit process moves through design preparation, application review, any required corrections, approval, construction inspections, and final sign-off. The responsible city or San Diego County agency confirms the requirements, fees, and review process for your property.
How does a garage conversion compare with a detached ADU?
A garage conversion works within an existing garage footprint; a detached ADU is a separate backyard unit. Garage conversions depend on the existing structure, access, utilities, and scope. Kingstone Building reviews the property before presenting project pricing. The right approach depends on the property and intended use.
What rental income could an ADU generate?
At a monthly rent of $2,500, an ADU generates $30,000 a year in gross rent. Vacancy, maintenance, insurance, financing, and other expenses reduce net income. The rent achievable for your ADU depends on the unit, location, and rental market.