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.
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ADBC Architecture completed an 800 SF detached ADU in East Bay, CA in 2025, designed for multigenerational living. Built with thermally modified wood and steel, the backyard cottage features high ceilings and large windows for a spacious feel.
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ADORE Homes is a California ADU contractor specializing in detached ADUs, garage conversions, JADUs & in-law suites. They manage design, permitting & construction, helping homeowners add value & living space.
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We Do Construction specializes in ADU garage conversions across the San Francisco Bay Area. Licensed and insured, they handle permitting, 3D planning, construction, and interior design, offering free estimates for homeowners.
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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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Mountain Top Construction is a Bay Area ADU builder serving San Rafael, San Francisco, and Las Vegas. They specialize in detached ADUs, backyard cottages, granny flats, and in-law suites, managing design, permitting, and construction.
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We are a family-first, boutique residential design & build firm serving the Orinda and East Bay community. We’re not just service providers — we’re your neighbors. We understand the local permitting process, the hillside terrain, the fire-hazard restrictions, and the thoughtful planning needed to create homes that truly work for East Bay families.
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Samara's Backyard ADU offers prefab accessory dwelling units for California homeowners. Five sizes available, including the 950 sq ft XL 10. Factory-built, fire-resistant, energy-efficient, with full-service permitting, installation & flexible financing.
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Cajigas Construction Inc. is a licensed ADU builder with 35+ years of experience serving Sacramento, Stanislaus, and San Joaquin Counties. Services include detached ADUs, JADUs, garage conversions, new home construction, and REO property services.
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Valley Boutique Builders is a licensed Bay Area ADU contractor offering full-service accessory dwelling unit construction, custom home additions, kitchen and bathroom remodeling, and new construction with free initial consultations.
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Custom Home is a Bay Area ADU contractor (CSLB #986048) with 160+ projects since 2005. They build detached, attached, junior ADUs & garage conversions across South Bay & Peninsula, with costs from $120K–$500K+.
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Home Revive Builders is a licensed ADU contractor in the Bay Area, CA, specializing in garage conversions, detached ADUs, in-law suites, and more. Full-service projects include design, permits, plumbing, electrical, and finishing.
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prefabADU is a Bay Area ADU builder with 16+ years of experience offering affordable kits and plans from under $45K. With 12 state-approved plans valid across California, they simplify permits, design, and installation for homeowners.
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ENE Smarthome, Inc. is a Bay Area contractor offering home remodeling, ADU construction, smart home upgrades, and accessibility improvements. Services include garage conversions, granny flats, aging-in-place remodels, and SB9-compliant ADU projects.
read moreHayward, California, situated in Alameda County along the eastern shores of San Francisco Bay, is one of the most strategically located cities in the East Bay. With its diverse population, proximity to major employment hubs like Silicon Valley and San Francisco, and a strong demand for affordable housing, ADU contractors in Hayward are busier than ever. The city's commitment to addressing the regional housing shortage makes Accessory Dwelling Units (ADUs) an increasingly popular solution for homeowners looking to add value to their properties or generate rental income.
Working with experienced ADU contractors in Hayward, CA is essential because local regulations must be carefully followed. Hayward adheres to California state ADU laws while also enforcing its own municipal codes. Key regulations homeowners and contractors must be aware of include:
Professional ADU builders in Hayward are experienced in constructing a variety of ADU types to suit different lot sizes and homeowner needs. The most common types include:
Hiring a local ADU contractor in Hayward offers significant advantages. Local professionals are familiar with the City of Hayward's Building Division permit process, plan check requirements, and inspection protocols. They understand the specific soil and seismic considerations relevant to the East Bay region, which can impact foundation design and construction costs. Additionally, local contractors often have established relationships with Hayward's planning and building departments, helping to streamline approvals and avoid costly delays.
Whether you're looking to create a rental unit, house a family member, or simply increase your property's value, partnering with a knowledgeable Hayward ADU contractor is the smartest first step toward a successful project.