California ADUs (granny flats) add rental income or family housing to existing lots. Detached units up to 1,200 sq ft are allowed. Building costs start at $1,200/sq ft. Hire a specialized ADU contractor in San Diego for permits and zoning complian... read more
Casita ADU is a San Diego-based full-service ADU builder handling permitting, design, and construction. As a trusted accessory dwelling unit contractor, they manage every project phase, ensuring on-time, on-budget builds for California homeowners.... read more
Falcon Builders Group is a San Diego ADU contractor specializing in detached ADUs, garage conversions, JADUs, in-law suites, and casitas. They guide homeowners through design, permitting, and construction to add functional, value-boosting living s... read more
Ten Seventy Architecture offers ADU design services in San Diego, led by Sean Canning. Specializing in detached ADUs, garage conversions & JADUs, they handle design to permitting. Costs start at $250–$300/sqft, with a $20K minimum design fee... read more
TNT Design & Build specializes in ADUs, garage conversions & room additions in San Diego's North County. 15 years experience, in-house management, free architectural design, prices from $325/sqft with guaranteed budget & timeline.
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Design Path Studio is a Southern California residential architecture firm specializing in modern, sustainable design. They focus on indoor-outdoor integration, clean lines, and natural light, with expertise in ADUs, garage conversions, and granny ... read more
Veteran-owned US ADU & tiny home builder serving San Diego & LA County. Premium materials, ANSI A119.5-compliant builds, Class A fire ratings, 3D design, site assessment, permitting support & NOAH/RVIA certification included.
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King Mahdi Builders is an ADU contractor offering detached ADUs, garage conversions, in-law suites, JADUs, granny flats, and casitas. They also handle general home renovation and remodeling projects.
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IL Total Design & Build is a San Diego ADU specialist offering full-service design, permitting, and construction for granny flats, garage conversions, detached ADUs, and JADUs. They also provide home additions and remodeling across San Diego C... read more
Forever Builders Inc is San Diego's premier ADU contractor, specializing in granny flats, in-law suites, and detached accessory dwelling units. They handle design, permitting, construction, and finishing, delivering high-quality, custom ADU soluti... read more
Homeowners across the San Diego area looking to expand their living space or create a rental opportunity turn to the trusted San Diego Builders at The Avalon Company. With more than three decades of experience, they specialize in designing and con... read more
Prominent Builders & Restoration is a San Diego ADU contractor with 55+ years of experience. They offer detached ADUs, garage conversions, and attached units across Southern California, managing every project step from design to final inspecti... read more
Mastery offers full-service ADU construction in San Diego, covering design, permitting, and building. Specializing in detached ADUs, garage conversions, and granny flats, they also provide kitchen remodeling, room additions, roofing, and more.
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San Diego has become one of the most active markets for Accessory Dwelling Units (ADUs) in the entire state of California. Thanks to its high property values, year-round desirable climate, and a persistent housing shortage, homeowners across neighborhoods like North Park, Ocean Beach, and Chula Vista are turning to ADU contractors in San Diego to maximize their property's potential. The city has embraced state-level ADU reform laws, making it easier than ever to build a secondary unit on your property.
Working with an experienced San Diego ADU contractor is essential because local regulations can be complex. San Diego follows California state law, which allows ADUs on most single-family and multi-family residential lots. Key rules include:
San Diego has streamlined its ADU permitting process through the Development Services Department (DSD). The city offers pre-approved ADU plans, which can significantly reduce approval timelines. A qualified ADU builder in San Diego will handle the permit application, architectural drawings, structural engineering, and coordination with city inspectors. Typical permit approval times in San Diego range from a few weeks for pre-approved plans to several months for custom designs.
Choosing the right contractor is critical to a successful ADU project. Reputable ADU contractors in San Diego will offer end-to-end services, including design, permitting, construction, and final inspection. When evaluating contractors, look for:
The cost to build an ADU in San Diego typically ranges from $150,000 to $350,000 or more, depending on size, type, and finishes. However, given San Diego's strong rental market — with average rents among the highest in California — homeowners can often see a strong return on investment. A well-built ADU can generate $1,500 to $3,000+ per month in rental income, making it a smart long-term investment in one of America's most competitive real estate markets.