Paramount Manufactured Sales in Riverside offers Skyline Homes-built ADUs for Southern California homeowners in LA, Orange, Riverside, San Bernardino & San Diego Counties. Models range from 479–849 sq ft. California law now allows detached ADUs up to 1,200 sq ft.
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MyADU4Less is a Southern California ADU builder specializing in prefabricated accessory dwelling units. Offering models from 160–1,200 sq ft, they handle design, permitting, and construction. CalHFA grants up to $40,000 may apply.
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Full Circle Builders offers custom ADU construction in Riverside County & the Inland Empire. Detached ADUs start at $185,000 (590 sq ft, 1BD/1BA). Container homes also available. Turn-key builds, permitting assistance included.
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US Modular Inc. is a trusted ADU builder in Riverside County, CA, with 35+ years of experience. They offer prefab ADUs, garage conversions & casitas starting at $150,000, completed in 6–9 months.
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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.
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Lunasol Construction is a San Diego ADU contractor specializing in detached ADUs, garage conversions, and JADUs. They offer custom designs for in-law suites, rental units, and granny flats, helping homeowners add value and living space.
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Building an ADU in Riverside takes 8–16 months. JDB Builders guides homeowners through design (1–3 months), permitting (2–4 months), construction (4–8 months), and final inspections (1–2 months) for granny flats, garage conversions, and more.
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Peak Construction and Design LLC builds custom ADUs in Springfield, OR, including detached cottages, attached units, in-law suites, and rental spaces. Expert ADU contractor offering full design-to-build services tailored to your property.
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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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ADU Of Oceanside is a full-service accessory dwelling unit builder in Oceanside, CA, handling design, permitting, and construction. Led by UC Berkeley-certified owner Colin Pond, they specialize in detached ADUs, granny flats, and garage conversions.
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Experienced ADU contractor offering a structured process: site assessment, custom design options, transparent cost estimates, permit guidance, and financing support. Specializing in detached ADUs, garage conversions, and in-law suites.
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Kirmina Construction (License #1124572) is a licensed general contractor in Riverside, CA, offering home additions, ADUs, garage conversions, room extensions, and outdoor living spaces across Riverside, San Bernardino, and Orange County.
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BNC Builders Inc. is a San Diego County ADU contractor offering detached, attached, garage conversion & JADU construction. Services include permit management, custom design & financing assistance.
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Kaminskiy Home Remodeling builds ADUs in San Diego, including granny flats, garage conversions, JADUs & basement units. Boost property value, earn rental income, or house family. Serving Poway, La Jolla, Encinitas & more.
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Sequoia Homes & Backyard Bungalows offer affordable ADU builder services in Carlsbad, CA. From granny flats to in-law suites, they handle design, permits, financing & installation. Projects completed in as little as 8 weeks.
read moreAnza is a small, unincorporated community located in Riverside County, nestled in the mountains of the Santa Rosa Plateau at an elevation of approximately 4,000 feet. Unlike incorporated cities, Anza falls under Riverside County jurisdiction, meaning ADU contractors must navigate county-level regulations rather than municipal codes. The rural character of Anza, combined with its unique terrain, well water systems, and septic infrastructure, creates a distinctive set of challenges and opportunities for homeowners looking to build an Accessory Dwelling Unit.
Since Anza is governed by Riverside County Land Use Services, ADU contractors must comply with the county's ADU ordinance, which aligns with California state law under AB 68, SB 9, and AB 2221. Key regulatory considerations include:
One of the most significant factors ADU contractors face in Anza is the lack of municipal water and sewer systems. Most properties rely on private wells and septic systems. Before breaking ground, contractors must assess whether the existing septic system has adequate capacity to support an additional dwelling unit. In many cases, a septic system expansion or upgrade is required, which must be approved by the Riverside County Department of Environmental Health. Similarly, well capacity evaluations may be necessary to ensure sufficient water supply for the new unit.
Hiring an experienced ADU contractor familiar with Anza and Riverside County is essential for a smooth project. Local contractors understand the specific soil conditions, fire hazard severity zones, and mountain climate considerations that affect construction methods and materials. Anza falls within a High or Very High Fire Hazard Severity Zone, which means ADU construction must comply with CAL FIRE building standards, including ember-resistant vents, fire-rated materials, and defensible space requirements.
Due to the rural location and infrastructure complexities, ADU projects in Anza may cost more and take longer than in urban areas. Homeowners should budget for:
Working with a licensed, insured ADU contractor who specializes in rural Riverside County projects ensures compliance, quality construction, and a smoother path to adding valuable living space on your Anza property.