• Remodeling & Improving Spaces From Concept to Completion
  • Hayward, CA 94545, United States
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ADU Homes Construction & Remodeling in the Bay Area

An accessory dwelling unit (ADU) adds living space, rental income and long-term value to your property. Hydroworks Developers designs and builds detached ADUs, attached ADUs, garage conversions and junior ADUs (JADUs) for Bay Area homeowners. We manage the whole project, from site evaluation and plans to permits, utilities and final inspection.

Bay Area ADU projects involve more than framing a new structure. They need careful planning around setbacks, utility connections, fire and energy codes, and each city’s permit process. Our team handles that work in a clear, organized way, so you know your timeline, your budget and your next step. Whether you want a home for family, a rental unit or a private office, we build an ADU that is comfortable, efficient and compliant.

ADU Homes Construction Services We Offer

Detached ADU Construction

Build an independent backyard home with a private entrance, functional living areas, and a design that complements your existing property.
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Attached ADU Construction

Expand your living space with an attached secondary unit planned around your home's structure, available space, and everyday needs.

Garage Conversion ADUs

Transform an existing garage into a comfortable living space with insulation, lighting, flooring, plumbing, and interior improvements.

In-Law Suite Construction

Create a private, accessible living environment for parents, relatives, or extended family while keeping everyone close to home.
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Small ADU Design & Build

Make the most of limited square footage with efficient layouts, smart storage, compact kitchens, and well-planned bathrooms.
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ADU Remodeling & Upgrades

Refresh an existing accessory dwelling unit with updated interiors, improved layouts, modern fixtures, and essential system upgrades.

Types of ADUs We Can Build

Discover flexible ADU construction and remodeling solutions for Bay Area properties. From new backyard homes to existing-space conversions, we help you create practical living spaces that suit your goals, property, and budget.

Detached Backyard ADU

Create a separate residential unit with private living areas, a kitchen, a bathroom, and comfortable everyday functionality.

Attached ADU Addition

Extend your home's usable space with a thoughtfully designed secondary unit that integrates with the existing structure of main home.

Garage-to-ADU Conversion

Reimagine an existing garage as independent living space with suitable insulation, utilities, finishes, and a functional floor plan.

Guest House & In-Law Units

Provide family members or guests with a private, welcoming space that balances independence with convenient access to the main home.

Studio & Compact ADUs

Maximize every square foot with multifunctional spaces, smart storage, efficient kitchens, and comfortable interior finishes.

Existing ADU Remodeling

Upgrade an older secondary unit with refreshed kitchens, renovated bathrooms, new flooring, improved lighting, and modern finishes.

ADU Construction Without Disrupting Daily Life

Building an ADU on your property doesn’t have to take over your life. We plan each phase carefully, protect your existing home and yard, and keep communication open so you always know what is happening on site. Our team considers site access, drainage, plumbing, electrical systems, material selection, and construction sequencing to help keep your project moving efficiently. We also account for applicable building codes and local permit requirements throughout the planning process.

 

Site Protection Plan

We protect landscaping, driveways and access paths, and mark a clear work zone.

Utility Coordination

We plan water, sewer, gas and electrical connections to limit service interruptions.

Clear Project Scheduling

You get realistic milestones including permit and inspection dates.

Code Compliant Construction

We build to the California Building Code, CALGreen & Title 24 energy requirements .

Noise & Dust Control

We follow set work hours and use dust barriers to limit impact on you and your neighbors.

Daily Site Cleanup

We clean up at the end of each work day so your property stays safe and tidy.

3 Simple Steps to Our ADU Building Process

Building an ADU can feel complex, but it doesn’t have to be. Our three-step process keeps your project organized, on budget and on schedule. From the first site visit to final inspection, we handle design, permits, utilities and construction in line with California ADU law and local city requirements.

01

Consultation

We visit your property, review setbacks, utilities and zoning, and discuss your goals, budget and ADU type.

02

Project Installation

We prepare plans, submit permits and build the ADU with coordinated trades, regular updates and quality checks.

03

Final Inspection

We complete city inspections, do a final walkthrough with you, and hand over your finished ADU.

Plan Your Project

    ADU costs depend on the unit's size, construction type, site conditions, utility connections, finishes, and permit requirements. A property assessment and defined project scope help establish a more accurate estimate.
    Most new ADU construction and conversions require applicable permits and must comply with relevant building and zoning regulations. Requirements vary by project and jurisdiction.
    A garage conversion may be possible depending on the property's conditions, applicable regulations, structural requirements, and utility needs. A site assessment can help determine the available options.
    The timeline varies with design complexity, permitting, site preparation, construction scope, inspections, and material availability. A project-specific schedule is more reliable than a general estimate.

    Additional ADU Construction Services We Offer

    Beyond building the main structure, a successful ADU project requires properly planned utilities, durable installations, and well-finished interiors. We offer additional construction and remodeling services to help create a functional, comfortable, and well-integrated secondary living space.

    1. ADU Plumbing Installation

    Plan and install water supply, drainage, and plumbing fixtures according to the project's approved scope.

    2. Electrical & Lighting Upgrades

    Coordinate electrical installations, lighting layouts, outlets, and necessary panel or service upgrades.

    3. HVAC & Ventilation Systems

    Plan suitable heating, cooling, and ventilation solutions for comfortable indoor living.

    4. Foundation & Site Preparation

    Coordinate excavation, foundation work, grading, and related preparation based on site conditions and engineered plans.

    5. ADU Kitchen Installation

    Create efficient kitchen spaces with cabinets, countertops, sinks, storage, and practical appliance layouts.

    6. ADU Bathroom Remodeling

    Upgrade bathrooms with modern fixtures, tilework, vanities, showers, and functional layouts.

    7. Framing & Insulation

    Coordinate framing, insulation, and interior wall assemblies to support comfort and building-code compliance.

    8. Flooring & Interior Finishes

    Complete your ADU with suitable flooring, paint, trim, cabinetry, and coordinated interior finishes.

    9. Exterior Finishing & Improvements

    Enhance your ADU's exterior with appropriate siding, weather protection, entryways, and finishing details.

    Transform Your Space With Hydroworks

    From expert plumbing services to complete remodeling, Hydroworks Developers delivers reliable solutions designed to improve comfort, functionality, and value.

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