Edri Construction, Inc. is a Berkeley-based general contractor specializing in ADU construction across the Bay Area. Services include garage conversions, detached ADUs, attached additions, granny flats, and custom interiors, with full project management from permits to finishing.
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Edri Construction, Inc. is a Walnut Creek-based ADU contractor serving the Bay Area. They specialize in garage conversions, detached ADUs, attached additions, in-law suites, and JADUs, handling design, permitting, and project management.
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Collins Remodeling is a licensed ADU contractor in Alameda, CA, specializing in detached ADUs, garage conversions, JADUs, and granny flats. They manage permitting, design, and construction, helping homeowners add value and rental income.
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Your Prefab ADU will be delivered and installed to your site. All ready to enjoy a sustainable home to last for generations.
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Mendez and Son's Construction is a Bay Area ADU contractor offering design-build services in Palo Alto, Mountain View, San Mateo & Walnut Creek. They handle detached ADUs, garage conversions & JADUs, managing permits to final inspection.
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Welcome to limitless possibilities with DMC Construction’s Accessory Dwelling Unit (ADU) construction services. As the demand for flexible living spaces grows, they stand ready to transform your property with innovative and expertly crafted accessory dwelling units.
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ADU Builders Group is a Bay Area family-owned ADU contractor with 21+ years of experience. They build attached, detached, converted, and junior ADUs, offering full design-build services, permitting support, a 3-year warranty, and a 10-year structural guarantee.
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ADUs (accessory dwelling units) are self-contained homes on existing properties. California's 2020 laws simplified ADU permits statewide. Alpha ADU Solutions, a San Francisco-based ADU builder with 100+ team members, specializes in granny flats, garage conversions & in-law suites.
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Feldman Construction specializes in custom ADU design and construction across the Bay Area, including San Mateo and Santa Clara County. They build detached ADUs, granny flats, and in-law suites to boost property value and expand living space.
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Karl Kardel Company offers home remodeling, additions, and ADU construction in Oakland, Pasadena, and the Bay Area. Services include detached ADUs, garage conversions, granny flats, kitchen and bathroom renovations for residential properties.
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Bay Builders & Remodeling specializes in custom ADU construction across Santa Clara, San Mateo, and East Bay. Services include attached, detached, garage conversions, and JADUs, helping homeowners add rental income, family housing, or workspace.
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DeBrus Construction LLC is a San Francisco general contractor specializing in seismic retrofits, foundation repair, ADU construction, and home remodeling. Led by Malcolm DeBrus, the company handles mandatory soft story retrofits, garage conversions, and full remodels with transparent pricing.
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New Avenue, Inc is a full-service design-build company serving the San Francisco Bay Area and Portland, OR since 2011. They specialize in ADUs, custom homes, renovations, additions, and Enclaves, managing design, permitting, and construction under one roof.
read moreCastro Valley is a unique location for ADU construction because it is an unincorporated community governed by Alameda County rather than an independent city. This means that homeowners looking to build an Accessory Dwelling Unit must work with the Alameda County Planning Department and follow Alameda County's specific zoning codes and building regulations. Experienced ADU contractors in Castro Valley understand this distinction and are well-versed in navigating county-level permitting processes, which differ significantly from those of neighboring incorporated cities like San Leandro or Hayward.
Because Castro Valley falls under Alameda County jurisdiction, ADU contractors must comply with the county's ADU ordinance, which aligns with California state law but includes local nuances. Some important regulatory considerations include:
Hiring a contractor with direct experience in Castro Valley and Alameda County is essential for a smooth ADU project. Local ADU contractors are familiar with the Alameda County Building Services Agency, which handles permit applications, inspections, and plan checks. They understand the typical timelines, required documentation, and how to address common issues that arise during the approval process. Castro Valley's hillside terrain in many neighborhoods also presents unique grading and foundation challenges that experienced local contractors are equipped to handle.
Castro Valley homeowners are increasingly choosing ADUs to address the Bay Area's housing demand and to generate rental income. The most popular ADU types in the area include:
Working with a qualified ADU contractor in Castro Valley ensures your project meets all Alameda County requirements while maximizing your property's potential. From initial design and permitting through final inspection, the right contractor will guide you every step of the way, helping you add value to your home in one of the East Bay's most desirable communities.