Builder Directory

This California-based manufacturer specializes in factory-built, state-pre-approved ADU designs ranging from 340 to 1,200 square feet, with a distinctive one-day installation process and fixed-price guarantee that covers permitting, foundation, and installation. Operating across more than 90 California cities with a 100% approval rate, the company differentiates itself through streamlined permitting (as few as 10 business days), fire-resistant WUI-certified designs, and rapid timelines from contract to occupancy—typically under six months. Abodu explicitly positions itself as a solution for wildfire rebuilding under California's AB 462, allowing residents to inhabit their ADU while their primary homes are reconstructed.

ADORE Homes operates as a California-based ADU builder specializing in prefabricated and custom accessory dwelling units for the state's residential market. The company focuses on streamlining the ADU development process through design-forward solutions tailored to California's regulatory and climate conditions. ADORE Homes positions itself as a regional specialist addressing the state's housing shortage through efficient, code-compliant unit production.

This California-based firm specializes in guiding homeowners through the complete ADU development process—from design and permitting to construction—with particular emphasis on helping clients retain ownership of their permit applications rather than ceding control to contractors. The company offers both custom design services through its in-house Design & Engineering team and pre-approved municipal plans, supported by complimentary consultations covering zoning, financing, timelines, and property tax implications. Their approach prioritizes client flexibility, allowing homeowners to shop permitted plans to multiple builders for competitive pricing while navigating California's complex ADU regulations.

Better Place Design Build approaches ADU development in San Diego through a feasibility-first methodology that validates zoning compliance, utility availability, and site conditions before providing estimates, minimizing cost overruns. The contractor specializes in detached ADUs, garage conversions, and room additions while maintaining expertise in the region's specific regulatory landscape, including the state's 4-foot setback requirements. This combination of thorough pre-design vetting and localized regulatory knowledge positions the firm to navigate San Diego's complex and evolving ADU rules efficiently.

This State of California HCD-licensed manufacturer and general contractor specializes in custom modular ADUs and homes built to order in California, emphasizing rapid delivery within six months and design customization across multiple price points. The company operates as a full-service builder offering turnkey solutions with decades of combined experience in modular construction technology and project management. Their distinctive approach combines factory efficiency with on-site general contracting expertise to streamline the building process for residential and commercial applications.

This California-based construction management firm specializes in full-service ADU development, handling design, permitting, and construction oversight for homeowners across the state. Casita's distinctive approach consolidates the entire ADU process under one roof, eliminating the need for multiple contractors while managing timelines, budgets, and quality control from initial consultation through final delivery. The company offers pre-approved design plans, comprehensive permitting packages, and in-house construction management, positioning itself as a turnkey solution for converting residential backyard spaces into income-generating units.

This architect-designed ADU manufacturer specializes in custom steel-frame units built in weeks rather than months or years, featuring distinctive black or white steel exteriors paired with wood facades and expansive glazing. Cover's approach emphasizes streamlined design and construction from initial consultation through installation, with configurable interiors and durable, health-conscious materials engineered for longevity. The company handles the full development pipeline—from design and permitting through manufacturing and move-in—positioning itself as an end-to-end solution for homeowners seeking efficient ADU construction.

Crest Backyard Homes is a San Diego–based ADU builder specializing in factory-built accessory dwelling units designed for multiple use cases, including rental income, multigenerational housing, and age-in-place caregiving arrangements. The company offers prefabricated ADU solutions and provides full-service development support, helping homeowners navigate California's evolving regulatory landscape, including opportunities created by AB 976's removal of owner-occupancy requirements. Crest's approach emphasizes comprehensive property assessment and customized design options to maximize each property's ADU potential.

This San Francisco Bay Area-based consulting firm specializes in passive solar design, photovoltaic systems, battery energy storage, and modular building solutions for off-grid and net-zero structures. Drawing on decades of experience in sustainable technologies and owner-builder practices, the firm offers comprehensive services spanning residential ADUs to village-scale infrastructure and water systems. Their approach combines early computer modeling techniques with pragmatic design solutions for homeowners, developers, and municipalities seeking sustainable living solutions.

GoADU Construction specializes in designing and building accessory dwelling units across Los Angeles and Southern California, offering a full-service approach that encompasses design, permitting, engineering, and construction oversight. The company distinguishes itself through deep local expertise in Los Angeles building codes and city approval processes, combined with a transparent, communicative approach that emphasizes schedule adherence and budget protection. GoADU's project range includes attached ADUs, detached backyard units, and garage conversions, all executed by fully licensed and insured contractors.

Golden State ADUs is a full-service design-build construction company based in Sacramento that provides design, permitting, and construction services for accessory dwelling units throughout California. With over 10 years of experience and more than 100 completed projects, the firm distinguishes itself through an in-house design and engineering team that creates custom ADUs tailored to individual properties and needs. The company streamlines the client experience with expedited processes, including a 72-hour project proposal turnaround for returning clients.

This West Coast dealer operates 13 locations across Washington, Oregon, California, Arizona, and New Mexico, positioning itself as the region's largest new manufactured and modular home retailer with direct access to seven major U.S. factories including Palm Harbor, Goldenwest, Champion, and Karsten Homes. The company distinguishes itself through extensive customization capabilities—from minor modifications to entirely custom floor plans and two-story models—and provides comprehensive support spanning site selection, financing, permitting, and construction oversight. With approximately 972 homes built in 2026, Homes Direct serves a five-state region while offering inventory across multiple square footage and bedroom configurations.

This Los Angeles-based general contractor specializes in ADU construction, custom homes, and residential additions throughout Greater Los Angeles, with deep expertise in navigating LA County's regulatory requirements and expedited permitting processes. The firm serves as the construction partner for GatherADU, leveraging its licensed status and knowledge of California state ADU laws to streamline project timelines for homeowners. Its focus on the Southern California market reflects both regional specialization and an understanding of local zoning complexities that affect ADU feasibility.

Joel and Co. Construction is a Los Angeles-based general contractor with over 50 years of experience and more than 7,000 completed projects since 1983, offering a full range of services including ADU and room additions, custom home building, and commercial construction. The firm distinguishes itself through a client-first approach emphasizing integrity and transparency, working collaboratively with clients, architects, engineers, and designers to deliver refined, well-built homes. Its service portfolio spans new construction, renovations, and accessory dwelling units, positioning it as a comprehensive builder serving the greater Los Angeles market.

This San Diego-based construction firm specializes in ADU construction, home remodeling, and permit management, positioning itself on transparency and straightforward pricing rather than hidden costs. Millan Construction serves residential and small commercial clients throughout the San Diego area, emphasizing clear communication and quality craftsmanship across projects ranging from small renovations to large-scale builds. The company distinguishes itself through its focus on problem-solving and staying current with industry innovations while maintaining strong relationships with vetted subcontractors and staff.

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prefabADU is a California-based manufacturer with over two decades of experience designing and building custom prefabricated ADUs and single-family homes since 2004. The company distinguishes itself through architectural diversity, offering everything from Tuscan villas to contemporary designs while maintaining the efficiency of factory construction. Operating primarily in California, prefabADU positions factory-built homes as a construction method rather than a stylistic category, serving homeowners seeking additional space, multigenerational housing, or rental income opportunities.

This California-based ADU manufacturer offers fully integrated design, permitting, installation, and financing services for homeowners seeking turnkey backyard solutions. Samara's Backyard line features customizable units ranging from 690 to 950 square feet, with options for one to two bedrooms and solar-ready systems designed for flexibility in use—rental, accessory dwelling, or primary residence. The company maintains a particular focus on serving fire-affected Southern California communities while positioning itself for expansion beyond the state.

Shelter Dynamics manufactures prefabricated ADUs in California with a robust sustainability focus, integrating Energy Star appliances, hybrid electric heat pump water heaters, LED lighting, zone-controlled mini-split HVAC systems, solar arrays, and smart home automation as standard features. Based in Venice Beach, the company positions itself in the premium market segment by prioritizing energy efficiency and modern smart home technology across its product line. Their approach appeals to California homeowners and developers seeking environmentally conscious ADU solutions that meet the state's advancing efficiency standards.

This San Diego-based design-build contractor specializes exclusively in detached ADU construction, having completed over 125 projects across Greater San Diego County since 2020. SnapADU manages the entire process in-house—from feasibility and design through permitting and construction—offering transparent fixed pricing and a portfolio ranging from efficient compact units to custom three-bedroom homes. As a woman-owned firm, the company distinguishes itself through predictable pricing, accountability across all project phases, and deep expertise navigating San Diego's varied ADU requirements, including HOA-restricted properties.