Detached backyard ADUs
Discuss how this part of the project fits the property, intended use, and construction plan.
Accessory dwelling units
Build an ADU around the way your property needs to work.
Kingstone Building helps San Diego homeowners move from an ADU idea to a practical residential construction plan, with coordination from early planning through completion.
What the project can include
A clearer path from idea to construction.
Every property and project is different. The first step is understanding what you want the space to accomplish.
Living space for family or future flexibility
Discuss how this part of the project fits the property, intended use, and construction plan.
Planning and design coordination
Discuss how this part of the project fits the property, intended use, and construction plan.
Project planning
Built around the property-not a template.
- Detached backyard ADUs
- Living space for family or future flexibility
- Planning and design coordination
- Residential construction through completion
Common questions
Before the first conversation.
What kinds of ADUs does Kingstone Building build?
Kingstone Building’s public service offering includes detached ADUs and garage conversions. The right approach depends on the property and project goals.
Where does Kingstone Building provide ADU construction?
Kingstone Building serves homeowners throughout San Diego.
How does an ADU project begin?
It begins with a conversation about the property, intended use, timing, and the type of space the homeowner wants to create.
Planning adu construction in San Diego?
Discuss your project ↗ADU 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.