Top-Rated ADU Near You in Union City, PA

Vierra Fine Homes
(*)(*)(*)(*)(*)5.0 (4 Reviews)
Committed Quality ResultsCommitted Quality Results
Craftsmanship WarrantyCraftsmanship Warranty
Fixed PricingFixed Pricing
Free ConsultationsFree Consultations
Locally OwnedLocally Owned

Vierra Fine Homes was founded with a commitment to fostering collaboration among architects, designers, and homeowners, ensuring a unique and positive experience for all involved. Our team shares a deep-seated passion for luxury design and construction, working in unison to create masterpieces that reflect each owner's distinct vision and lifestyle. Our versatile portfolio showcases a profound understanding of diverse project styles, from traditional to ultra-modern. We are adept at handling projects of all

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Brother & Brother Builders
(*)(*)(*)(*)(*)4.9 (156 Reviews)

Brother & Brother Builders is a trusted general contracting company specializing in high-quality residential remodeling and construction services throughout the Bay Area. With years of experience and a commitment to craftsmanship, we help homeowners bring their vision to life with precision, creativity, and care. Our services include kitchen and bathroom remodeling, home additions, garage conversions, ADUs, and full-home renovations. From design to completion, our team ensures a smooth, transparent process

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spire architecture inc
(*)(*)(*)(*)(*)5.0 (31 Reviews)

Spire Architecture is a full-service architectural firm dedicated to designing innovative, functional, and timeless spaces. With a commitment to creativity, sustainability, and precision, we craft residential and commercial designs that reflect our clients’ unique vision and lifestyle. Our expertise includes custom home design, renovations, commercial architecture, and interior space planning. From concept development to construction oversight, we ensure a seamless process that integrates aesthetics with fu

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LETTER FOUR, INC.
BoutiqueBoutique
Committed Quality ResultsCommitted Quality Results
Eco-FriendlyEco-Friendly
Free ConsultationsFree Consultations
Woman OwnedWoman Owned

From major remodels and additions to new construction, Letter Four's residential and commercial clients across Southern California benefit from our in-house expertise in architecture, interior design and licensed general contracting. From permits and plans to the last lick of paint, we provide a matchless combination of continuity, creativity and craftsmanship. This is design-build as it should be: a seamless, simple and stress-free journey to the space of your dreams.

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Norman G Phillips

Norman G. Phillips & Associates is a full-service general contracting firm specializing in high-quality residential and commercial construction. With decades of experience, we are committed to delivering expert craftsmanship, innovative solutions, and seamless project management from start to finish. Our services include custom home building, renovations, tenant improvements, and commercial construction. Whether you're remodeling a home, expanding a business, or undertaking a new build, our skilled team ens

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ALiGCUS

ALiGCUS

Vetted badgeVetted Pro
Free ConsultationsFree Consultations
Locally OwnedLocally Owned
Minority OwnedMinority Owned
Offers FinancingOffers Financing
Speaks MandarinSpeaks Mandarin
AP Remodeling
(*)(*)(*)(*)(*)4.9 (322 Reviews)
BoutiqueBoutique
Committed Quality ResultsCommitted Quality Results
Committed to SatisfactionCommitted to Satisfaction
Free EstimatesFree Estimates
LuxuryLuxury

LA's High-End Remodeling & Design-Build Firm: Best of Houzz Service 2017-2024. Over 350 5-star rated combined, AP Remodeling Inc. team has a combined experience of 20 years in development, new construction, and remodeling services for the greater area of Los Angeles County. AP Remodeling is distinguished by its transparency, agility and innovation. Our work process proved itself to be successful both for our company and our customers. From our initial meeting, clients can expect to to receive valuable insig

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Caldwell Construction Inc.
(*)(*)(*)(*)(*)4.6 (24 Reviews)

Ever since opening our doors back in 2014, we’ve been committed to our clients’ unique project needs and achieving their utmost satisfaction with our work. As a leader in the industry, we use a comprehensive approach in order to provide a wide range of services for the projects we’re involved with. From dealing with bureaucratic requirements to coordinating with subcontractors, Caldwell Construction Inc. guarantees precise, timely, and efficient work. Get in touch to bring your vision to life today.

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Architecture JHK, Inc.
(*)(*)(*)(*)(*)5.0 (17 Reviews)
Available by AppointmentAvailable by Appointment
BoutiqueBoutique
Budget-FriendlyBudget-Friendly
Eco-FriendlyEco-Friendly
Established inEstablished in

Architecture JHK is a Los Angeles-based boutique design firm with over 20 years of experience specializing in custom homes. Our mission is to partner with you the homeowner to make your vision a reality with the aesthetic style, function, and value you desire in your dream home. We are dedicated to the power of built and natural environments to impact the way we live, especially how we foster connections with each other. Our highest ideals center in the application of timeless architectural design aesthetic

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L E Construction General Building Contractor Inc
(*)(*)(*)(*)(*)5.0 (13 Reviews)
Beat Match PricesBeat Match Prices
Committed Quality ResultsCommitted Quality Results
Free EstimatesFree Estimates
Years in BusinessYears in Business

L E Construction is a licensed and bonded General Contractor serving residential and commercial customers throughout Ventura County since 1999. In addition to general contracting services they specialize in remodeling and solar installation. Transform your home with L E Construction! Our expertise extends to ADUs, Bath Remodeling, Kitchen Remodeling, Room Additions, New Construction, Outdoor Living Spaces, and a full range of services including Decks, Patio Covers, Carpentry, Concrete, Stucco, Tile, Floorin

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ADU FAQs

An Accessory Dwelling Unit (ADU) is a secondary residential unit on the same property as a primary home. Common examples include detached ADUs (freestanding structures), attached ADUs (connected to the main house), or garage conversions. Homeowners often build ADUs to:

  • Accommodate aging family members or adult children.
  • Generate rental income as a long-term investment.
  • Increase property value through additional living space.

If you're considering an ADU, it’s important to evaluate your property’s zoning regulations and infrastructure to ensure compliance with local laws.

The cost of building an ADU varies depending on size, materials, location, and complexity. On average, homeowners spend $50,000 to $250,000 on an ADU. Here’s a breakdown:

  • Garage Conversions: $50,000–$100,000
  • Attached ADUs: $100,000–$200,000
  • Detached ADUs: $150,000–$250,000+

Keep in mind that factors like design customization, permits, and site preparation can increase total costs. Always request detailed quotes from multiple contractors to ensure accurate estimates.

In Union City, you’ll typically need zoning and building permits to construct an ADU. Depending on your city or county, you may also have to submit:

  • Site plans
  • Utility connection approvals
  • Engineering or structural reports

Check your local building department’s website or contact a professional ADU contractor who can guide you through the permitting process. Accurate documentation and upfront compliance can save you time and penalties during the construction phase.

The timeline for building an ADU typically ranges from 6 months to 18 months. Here’s an overview of the stages:

  1. Design and Planning: 2–4 months (including permits and engineering approvals)
  2. Construction: 3–9 months (actual building and inspections)
  3. Finalization: 1–3 months (finishing touches, landscaping, approvals)

Timelines can vary based on project complexity, contractor availability, and your local building department’s approval process.

When hiring an ADU contractor, look out for the following red flags:

  • Refusal to provide proof of licensing or insurance.
  • Lack of experience with ADU projects.
  • Lowball estimates that seem too good to be true.
  • Contractors asking for large upfront payments before starting work.
  • Poor communication or unwillingness to provide a clear project timeline.

Always read reviews, request references, and verify your contractor’s credentials with your state licensing board before signing a contract.

To ensure your ADU complies with building codes, follow these steps:

  1. Consult Local Regulations: Research the zoning and building ordinances in your city or county.
  2. Hire a Reputable Contractor: Partner with a builder experienced in ADU projects within your area.
  3. Obtain Necessary Permits: Secure all required permits from your local building department before breaking ground.
  4. Schedule Inspections: Allow inspectors to evaluate the project at key stages to confirm compliance.

For specific building code inquiries, visit the International Code Council (www.iccsafe.org) or consult your local building authority.

In Union City, many homeowners are allowed to rent out their ADUs, but rental regulations can vary significantly depending on local laws. Common requirements include:

  • Securing a rental license or registration.
  • Complying with maximum occupancy rules.
  • Following rules regarding short-term rentals (e.g., Airbnb).

It’s important to verify rental guidelines with your city or county housing authority before listing your ADU to ensure compliance and avoid fines.

A Junior Accessory Dwelling Unit (JADU) is a smaller, more compact version of an ADU, typically limited to 500 square feet. Key differences include:

  • JADU: Often repurposes existing space within the primary residence (e.g., a spare bedroom or garage) and may share facilities like a bathroom or kitchen.
  • ADU: Can be a completely separate structure with its own kitchen, bathroom, and entrance.

JADUs are ideal for limited spaces or lower budgets, while standard ADUs offer more independence and privacy for tenants.

Converting a garage into an ADU is often a cost-effective and efficient way to add livable space because:

  • The existing structure reduces construction costs.
  • Garage conversions often bypass strict zoning restrictions.
  • They provide an opportunity to repurpose underutilized space.

However, you’ll need to ensure the garage meets structural and insulation requirements, and you may need to relocate utilities or parking spaces. Consulting a professional is key to a successful conversion.

Financing an ADU can be accomplished through various methods, including:

  • Home Equity Loans/HELOCs: Borrowing against the equity in your home.
  • Cash-Out Refinancing: Refinancing your mortgage to access additional funds.
  • Personal Loans: Unsecured loans with flexible terms for smaller projects.
  • Government Grants or Subsidies: Some states and cities offer financing assistance for ADUs.

Work with a financial advisor to choose the funding method that best fits your budget and long-term goals.

Reviews for ADU

Seamless ADU Conversion in San Diego
Our garage was just collecting dust, but this service made starting an ADU conversion effortless. Within a day, we had three competitive bids from local pros. We picked one, and in under four months, our ADU was fully finished, bringing in rental income already!
Lisa H.
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Quick Fix for Zoning Snags
We hit a roadblock with city permits for our backyard ADU in Austin. The contractor we found through the platform knew exactly how to address zoning challenges and fast-tracked the process. We’re now ahead of schedule and saved thousands in potential delays.
Mark J.
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Dream ADU, Zero Stress
Converting our basement into an ADU felt overwhelming at first, but this service connected us with an expert in Boston in less than an hour. They handled everything from design to build, and we finished well under budget. It’s already a cozy space for my mother-in-law to move into!
Sarah P.
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Learn More about Our Contributors

Maria Vierra avatar

Maria VierraEditor

Maria Vierra is the lead designer at Vierra Fine Homes, bringing over two decades of experience in high-end residential design and construction. Her expertise and attention to detail ensure every project meets the highest standards of excellence, blending functionality with aesthetic appeal.

Brett Taylor avatar

Brett TaylorAuthor

Brett Taylor is the co-founder of The Builder Market and a visionary entrepreneur in the home services and construction industries. With a passion for innovation, Brett has played a pivotal role in revolutionizing how professionals and homeowners connect and collaborate.

This page was last updated on Jan 4, 2026, 5:52:18 AM