Aura Design Build is a San Diego-based luxury renovation and ADU construction firm serving Southern California, including Newport Beach and Laguna Beach. With 15+ years of experience, they offer kitchen remodels, bathroom renovations, custom cabinetry, and full ADU builds.
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OneStop ADU is a San Diego County ADU contractor with 25+ years of experience. They offer custom-built detached ADUs from ~$335/sq ft, including solar, permits & plans. Free feasibility studies available. ADA-compliant units offered.
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Coronado Construction builds Accessory Dwelling Units (ADUs) in San Diego, CA. From garage conversions to detached units, their ADUs boost property value, generate rental income, and offer flexible living using quality, energy-efficient materials.
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ADUplus Consulting Inc., trusted since 1979, offers full-service ADU design, permitting, and construction in California. From detached ADUs to garage conversions, they help homeowners boost property value and generate rental income.
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Rom Builders is San Diego's trusted ADU contractor, offering full-service accessory dwelling unit construction. From design and permitting to build and inspection, they handle it all. California licensed, bonded, and backed by a four-year warranty.
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Dagan Design & Construction (DDC), founded in 2012 in Encinitas, CA, offers custom home design, luxury renovations, interior design, and general contracting across Southern California and nationwide.
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AMDEN HOMES - Design & Build is a San Diego ADU contractor with 20+ years of experience. They specialize in accessory dwelling units, guest houses, and remodels across San Diego County, offering full design-to-build services.
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California ADUs are self-contained units on single-family lots, offering rental income, family housing, and no land purchase. Build up to 1,200 sq ft. Fassino Development guides homeowners through ADU construction, ensuring local code compliance.
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H&M Building Services LLC builds ADUs in San Diego using a 3-phase process: site feasibility, design/engineering, and full construction. Projects average 6–10 months, with Buildertrend portal updates and turnkey delivery upon final occupancy certificate.
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Accessory Dwelling Units (ADUs) add value and flexibility to California properties. Learn about ADU regulations, design options like garage conversions, and how Hubbell & Hubbell Architects can help you build a compliant granny flat or guest house.
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Kol & Co. is an ADU contractor serving Orange County, West LA & North San Diego. With 15+ years in design-build, they handle detached ADUs, garage conversions, JADUs & more—managing permits, design, and construction under one roof.
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Proteus Homes is a custom home and ADU builder with 30+ years of experience in the Southwest US. They offer full-service ADU construction, including design, permitting, and panelized off-site fabrication, with move-in-ready homes in under three months.
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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 constructing high end accessory dwelling units that blend seamlessly with your existing property while increasing functionality and property value.
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Mastercraft Home Improvement offers expert ADU construction services, including granny flats, garage conversions & in-law suites. Boost property value by 10–25%, earn rental income & add flexible living space with a trusted ADU contractor.
read moreSan Marcos is one of the fastest-growing cities in San Diego County, with a booming population and a strong demand for additional housing. As a city that blends suburban neighborhoods with proximity to California State University San Marcos (CSUSM), there is a particularly high demand for Accessory Dwelling Units (ADUs) to house students, faculty, and multigenerational families. Hiring experienced ADU contractors in San Marcos, CA is essential to navigate the city's specific permitting processes and make the most of your property investment.
ADU projects in San Marcos are governed by both California state ADU law and the City of San Marcos Municipal Code. The city has adopted state guidelines that allow homeowners to build ADUs on single-family and multifamily lots. Key regulations include:
All ADU permits in San Marcos are processed through the City of San Marcos Development Services Department. A qualified local ADU contractor will be familiar with the city's online permitting portal and typical review timelines, which can help avoid costly delays.
Choosing the right ADU builder in San Marcos means finding a licensed general contractor with proven experience in San Diego County's regulatory environment. The best contractors will handle everything from design and engineering to permit submission and final inspection. Look for contractors who:
With San Marcos home values continuing to rise and rental demand driven by CSUSM and nearby employers in the San Marcos Innovation Corridor, adding an ADU is one of the smartest investments a homeowner can make. Whether you're building a detached backyard cottage, converting a garage, or adding a JADU, working with a skilled ADU contractor in San Marcos, CA ensures your project is completed on time, on budget, and fully up to code.