Prefab / Modular ADU in California

Ghouse Technologies

20720 Ventura Blvd Suite 100, Los Angeles, CA 91364

Prefab Specialist Eco-Friendly

Ghousetechnologies is a California ADU contractor offering steel frame accessory dwelling units. Models range from 360–1,200 sq ft. Builds are fire, flood, earthquake, and hurricane-resistant, eco-friendly, and completed faster than traditional ... read more

A1 ADU Contractor

13701 Riverside Drive #200, Sherman Oaks, CA 91423

14 years in business Prefab Specialist

A1 ADU Contractor specializes in garage conversions and custom ADU construction throughout Los Angeles and the San Fernando Valley. With over 15 years of experience, our team provides complete design, permitting, and construction services to trans... read more

Modulart

11300 Sorrento Valley Road, San Diego, CA 92121

ADU Company San Diego County specializes in off-site ADU construction, offering efficient, affordable accessory dwelling units. From granny flats to detached ADUs, their expert team guides clients from concept to Certificate of Occupancy.

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Crest Backyard Homes - ADU Builders San Diego CA

2982 Ora Avo Terrace, Vista, CA 92084

Eco-Friendly

Crest Backyard Homes is San Diego's trusted ADU builder, specializing in prefab, detached ADUs, granny flats & garage conversions. Their all-inclusive team guides homeowners from design to completion, ensuring code-compliant, high-quality acce... read more

Perpetual Homes ADU

4115 Blackhawk Plaza Circle, Danville, CA 94506

40 years in business Prefab Specialist Eco-Friendly

Perpetual Homes is a Northern California ADU builder with 40+ years of experience. They offer customizable prefab ADUs, a 10-step process, no site work markup, Energy Star insulation, a 7-year warranty, and an A+ BBB rating. read more

ORR Construction

1977 Obispo Avenue, Signal Hill, CA 90755

Eco-Friendly

ADUs are secondary units built on existing lots. ORR Construction builds detached ADUs, garage conversions, JADUs & in-law suites in California. Costs range $50–$300/sq ft. California laws like SB 897 simplify the permitting process.

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MTR

1984 Enterprise Boulevard, West Sacramento, CA 95691

MTR (Modern Technology Resources Inc.) offers full-service ADU design and construction in Sacramento, CA. Services include custom builds, garage conversions, permit management, and prefab options—helping homeowners add value with functional, aff... read more

Other cities in California

• North Highlands
• Sacramento
• North Hollywood
• Agoura Hills
• Encino
• Los Angeles
• Tarzana
• Long Beach
• Hollywood
• Glendale
• Valley Village
• Pasadena
• Burbank
• Downey
• Beverly Hills

What you need to know

Searching for top Prefab / Modular ADU ADU Contractors in California? Our directory highlights trusted local professionals who specialize in designing and building accessory dwelling units (ADUs).

Working with a qualified Prefab / Modular ADU ADU Contractor in California ensures your ADU project meets local building codes, zoning laws, and permit requirements. Whether you're planning a detached ADU, garage conversion, or backyard cottage, experienced Prefab / Modular ADU professionals can guide you through every step.

California homeowners are increasingly investing in ADUs to create additional living space, generate rental income, or support multigenerational living. The Prefab / Modular ADU experts featured here bring local expertise and proven experience to help make your project a success.

Browse our listings to find the best Prefab / Modular ADU ADU Contractors in California, and get started today.