Detached ADU in California

Intelligent Choice Builders is a licensed Bay Area ADU contractor serving Palo Alto, Cupertino, San Jose & Sunnyvale. They build detached ADUs, garage conversions, granny flats & more, managing permits, design & construction end-to-end.

At ADU San Mateo, we combine architectural insight, construction experience, and deep knowledge of Bay Area zoning laws to deliver high quality accessory dwelling units from design through move in. Our mission is simple: to make building your ADU clear, fast, and stress free.

OT Bay Builders is a complete remodeling company with over 40 years of combined experience amongst our team. We’re expert Bay Area ADU builders in San Jose with a customer-first mindset. As a full-service ADU builder, you can trust us to remain by your side from the first consultation to the final walkthrough.

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.

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 accessory dwelling units.

KN Remodeling is a certified ADU contractor serving Los Angeles, Woodland Hills, Simi Valley & Thousand Oaks. Specializing in detached ADUs, attached ADUs & garage conversions, they handle design, permits & construction with 100+ ADU plans completed.

Global Arch Construction builds ADUs in Sacramento, offering detached units, garage conversions & in-law suites. Licensed design-build contractor managing permits, zoning & full construction. Projects completed in 4–8 months.

Cali ADU is a top Los Angeles ADU builder offering custom and pre-designed accessory dwelling units, garage conversions, and granny flats. Fixed pricing, fast permitting, and expert project management ensure stress-free builds from design to move-in.

Your Prefab ADU will be delivered and installed to your site. All ready to enjoy a sustainable home to last for generations.

Woolsey Construction is a San Diego design-build firm with 15+ years of experience in custom homes, remodels, and ADU construction. Based in El Cajon, they offer expert project management, clear communication, and quality craftsmanship throughout Southern California.

As a full-service construction company focused exclusively on ADUs and multifamily housing, we guide you through every step—from initial concept to final walkthrough. Whether you're adding a high-quality ADU to your property or developing affordable housing solutions for your community, we deliver spaces that are functional, personal, and built to last.

Elite Construction builds ADUs in Santa Cruz County, offering detached units, garage conversions & addition ADUs. Projects range 250–1,200 sq ft, cost $115K–$450K, and take 6–9 months. Free estimates available.

In addition to remodeling projects, the team at HCS specializes in the new construction of Accessory Dwelling Units (ADUs) in Bakersfield as well. From the ground up, we will work with you every step of the way – bringing your blueprint to fruition.