ADU Builder and Garage Conversions in San Diego, CA
Maximize your property’s potential with a custom ADU or garage conversion. At SD Build Co., we specialize in transforming underutilized spaces into functional, stylish living areas—perfect for rental income, multigenerational living, or personal use.
- Manufacturer Warranties Available
- Custom & Special Orders
Why Choose an ADU or Garage Conversion?
- Generate Rental Income
Tap into San Diego’s high demand for affordable housing by creating a rentable unit on your property. .
- Increase Property Value
Homes with ADUs often see a significant boost in market value due to the added living space and versatility
- Flexible Living Solutions
Whether it’s a guest suite, home office, or space for extended family, ADUs offer adaptable living arrangements. Converting existing structures like garages minimizes construction costs and maximizes your property’s footprint.


Our Comprehensive Process in San Diego County
- Consultation & Feasibility
With years of experience in San Diego County, we assess your property’s potential and discuss your vision
- Design & Planning/Permitting
Our team crafts a design that complements your main residence and meets your needs. We navigate San Diego’s permitting process, ensuring compliance with all local regulations
- Construction
Our skilled builders bring your ADU or garage conversion to life with quality craftsmanship
Frequently Asked Questions
How much does it cost to build an ADU or convert a garage in San Diego
Costs typically range from $100,000 to $300,000, depending on the size, finishes, and whether it’s a detached ADU or a garage conversion. We’ll give you a detailed estimate after a free site visit and consultation.
Do I need a permit for an ADU or garage conversion?
Yes. All ADUs and garage conversions in San Diego require permits. Our team handles the entire permitting process to ensure your project is fully compliant with local zoning and building codes.
How long does it take to complete an ADU or garage conversion?
Most projects take around 8 to 12 months from initial design through construction. This includes time for planning, permitting, and building — and we’ll keep you updated at every step.