ADU Construction in San Diego

Accessory Dwelling Units (ADUs) have become one of the most popular home improvement projects in San Diego, offering homeowners the opportunity to increase property value, generate rental income, and provide flexible living space for family members. One Stop Builders specializes in ADU construction throughout San Diego County, guiding you through every step from initial design and permit applications to final inspection and occupancy.

Why Build an ADU in San Diego?

San Diego's housing market and favorable ADU regulations make accessory dwelling units an excellent investment. Benefits of building an ADU include significant rental income potential ($2,000-$4,000+ monthly depending on location and size), increased property value (typically $200,000-$400,000 added value), multigenerational living solutions for aging parents or adult children, home office or studio space, and flexibility to adapt as your needs change. California's streamlined ADU laws have simplified the permitting process, making now an ideal time to add an ADU to your San Diego property.

Types of ADUs We Build

We construct all types of accessory dwelling units to suit your property and needs. Detached ADUs are standalone structures in your backyard, offering maximum privacy and rental appeal. Attached ADUs connect to your existing home, providing cost savings on shared walls and utilities. Garage conversion ADUs transform existing garages into livable space, often the most economical option. JADUs (Junior ADUs) are created within the existing primary dwelling, typically 500 square feet or less. We help you determine which ADU type best fits your property, budget, and goals.

ADU Construction Costs in San Diego

The cost to build an ADU in San Diego varies based on size, type, finishes, and site conditions. Garage conversions typically range from $100,000-$200,000, making them the most budget-friendly option. Detached ADUs generally cost $200,000-$400,000 depending on size (400-1,200 sq ft) and finish level. Custom designs with high-end finishes can exceed $400,000. We provide detailed cost breakdowns including design fees, permit costs, site preparation, foundation, framing, plumbing, electrical, finishes, and landscaping so you understand your complete investment.

San Diego ADU Regulations & Permits

Navigating San Diego ADU regulations can be complex, but our experience ensures smooth permit approval. California law allows ADUs on most single-family lots, with recent reforms streamlining the process. Key requirements include setback minimums (typically 4 feet from property lines), height limits (16-25 feet depending on type), parking requirements (often waived), and utility connections. We handle all permit applications, structural engineering plans, and coordination with the City of San Diego to ensure code compliance. Our expertise with local regulations saves you time and prevents costly mistakes.

ADU Design & Features

Modern ADU designs in San Diego maximize space efficiency while providing comfortable, functional living. Popular features include open-concept floor plans with kitchen, living, and dining areas, one or two bedrooms with ample closet space, full bathrooms with walk-in showers, energy-efficient windows and insulation, mini-split HVAC systems for climate control, stackable washer/dryer units, and outdoor living spaces. We create designs that complement your main home's architecture while meeting California Title 24 energy standards and ADA accessibility guidelines when needed.

ADU Construction Timeline

A typical ADU construction project in San Diego takes 6-12 months from initial consultation to move-in ready. The process includes design and planning (4-8 weeks), permit approval (8-16 weeks depending on jurisdiction), and construction (12-24 weeks depending on size and complexity). Garage conversions are typically faster, while detached ADUs with complex site work may take longer. We maintain clear communication throughout, providing regular updates and addressing concerns promptly to keep your project on schedule.

Why Choose One Stop Builders for ADU Construction

As a licensed general contractor in San Diego (License #1101128) specializing in ADU construction, we provide comprehensive services from concept to completion. Our team includes experienced designers, permit specialists, licensed tradespeople, and project managers dedicated to your success. We handle architectural plans, structural engineering, permit applications, utility connections, and all construction phases. Our all-in-house approach ensures consistent quality, clear accountability, and seamless coordination. With over 15 years serving San Diego homeowners and dozens of completed ADU projects, we have the expertise to transform your property with a beautiful, functional accessory dwelling unit.