(424) 500-0950
Contact Us
(424) 500-0950
Contact us

A1 ADU Contractor

Turning Spaces into a Beautiful, Functional ADU — Custom-Built by Experts with 15+ Years of Experience!

CALL NOW (424) 500-0950
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Over 500 successful ADU conversions

Fully licensed & insured in California

Projects delivered on time — no subcontractors

Complete design, permits, construction handled in-house

There's a reason we're rated 5-Stars over and over!

Verified Reviews

All Reviews 5.0
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Lilah Makai
Lilah Makai March 16
★★★★★

Adding an ADU felt overwhelming at first, but our A1 ADU Contractor in Sherman Oaks made it feel easy. They communicated clearly and respected our home throughout the process. The crew showed up consistently, even on brisk mornings. The final result is a comfortable, energy-efficient space that stays warm at night and bright during sunny afternoons. Our family absolutely loves it. I highly recommend them to anyone considering an ADU project.

Posted on Google
Joshua Miller
Joshua Miller March 15
★★★★★

Our experience with an A1 ADU Contractor in Sherman Oaks was honestly refreshing. From the first meeting, they listened to what we wanted and offered practical suggestions. Construction stayed on track despite cooler weather and shorter daylight hours this time of year. The finished ADU looks like it was always part of our home. It’s now a peaceful workspace away from the main house. We’re thrilled with the outcome and highly recommend their services.

Posted on Google
Kay Gee
Kay Gee March 13
★★★★★

Converting the garage into an ADU was a great investment, and this business nailed it. They handled permits, construction, and finishes without me having to chase them around. The new space is cozy, bright, and private.

Posted on Google
Melissa Burnett
Melissa Burnett March 10
★★★★★

My garage was just wasted space before this project. The transformation into a livable ADU was done quickly and looks high quality. Every visitor thinks it’s a brand new build, not a conversion.

Posted on Google
Jolyn Cantu
Jolyn Cantu March 9
★★★★★

We are thrilled with the ADU renovation A1 ADU Contractor completed for us. Chris was incredibly knowledgeable and guided us through the whole process seamlessly. The quality of work exceeded our expectations, and we couldn't be happier with our new space!

Posted on Google
Jason Pratt
Jason Pratt March 6
★★★★★

We wanted a backyard ADU for rental income, and choosing an A1 ADU Contractor in Sherman Oaks was the best move we made. They were patient with all our questions and helped us design something that truly fit our lot. Even after some light winter rain, they kept everything moving smoothly. The craftsmanship is solid and you can tell they care about the details. The space feels modern yet comfortable. We’re beyond grateful and would recommend them without hesitation.

Posted on Google
Walter Carter
Walter Carter March 1
★★★★★

I hired a contractor to build an accessory dwelling unit in my backyard. From the first consultation to the final walkthrough, the team was professional and knowledgeable. They helped design the unit efficiently, handled all permits, and kept the construction site organized and clean. The quality of work exceeded my expectations, and the project was completed on time. I’m extremely happy with the result.

Posted on Google
Tyler James
Tyler James February 25
★★★★★

We replaced our roof this winter in Sherman Oaks and couldn’t be happier. The team was respectful, hardworking, and detail-oriented. Even with occasional rain, they stayed organized and careful. Our home feels safer and looks refreshed. We highly recommend them for anyone needing roofing work.

Posted on Google
Matthew Cooper
Matthew Cooper February 23
★★★★★

We hired an A1 ADU Contractor in Sherman Oaks to build a detached ADU in our backyard, and the whole experience honestly exceeded our expectations. Even with the cooler winter mornings and a few rainy days, the crew stayed on schedule and kept everything clean and organized. They explained every step in simple terms so we always knew what was happening. The new space feels warm, bright, and perfect for our in-laws. It’s amazing how smoothly everything went from start to finish. We’re so happy with the final result and highly recommend them to anyone thinking about building an ADU.

Posted on Google
James John
James John February 16
★★★★★

I recently hired A1 ADU Contractor for a remodeling project at my home in Sherman Oaks and I couldn’t be happier with the results From the initial planning to the final walkthrough the team was professional communicative and detail oriented They truly did an amazing job bringing my vision to life. If you’re looking for a reliable contractor in the Valley I highly recommend them

Posted on Google
Supian Sauri
Supian Sauri January 20
★★★★★

Team worker made the process painless. The garage door conversion turned out seamless . Thanks a lot good service

Posted on Google
Emmanuel Perez Casanova
Emmanuel Perez Casanova January 19
★★★★★

I had a stressful lockout situation late at night, but AJ Locksmith is a game-changer. I called their emergency number, and the person I spoke with was calm and courteous. The locksmith, Robert, called when he was on his way and arrived in under 20 minutes. He was extremely professional and friendly, taking one look at the situation and unlocking my door without damaging anything. The best part was that the final cost was exactly as quoted over the phone. No surprise charges or hidden here somsd. I would highly recommend this company to anyone in need of a reliable emergency locksmith.

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garage conversion services
A before-and-after comparison of a garage converted into a home gym. The left image shows a cluttered garage with exposed concrete floor, orange metal shelving units against the left wall containing various equipment and boxes. The right image shows the same space after conversion, with a modern home gym setup featuring a black and silver power rack, a gray treadmill, and black rubber gym flooring covering the concrete. The walls are painted white, and there's a window on the far wall letting in natural light. The ceiling shows exposed garage door tracks and lighting fixtures. The shelving units are partially visible in both images, containing exercise equipment and storage items. The concrete floor in the before image is dirty and has oil stains. The after image shows a clean, organized space with professional-grade fitness equipment. The garage door frame is visible at the top of both images, showing the white trim against the light-colored siding of the house.
garage converted to home theater
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A modern screened-in porch with floor-to-ceiling windows and black metal railings. The space features a large L-shaped sectional sofa with navy blue cushions and wicker frame. The sofa is adorned with decorative pillows in gray and white geometric patterns. A large beige wicker ottoman serves as a coffee table in the center of the seating area. The floor is covered with a large area rug featuring intricate patterns in red, blue, and beige tones. The rug has traditional design elements with floral motifs. Through the windows, there is a view of bare winter trees and a wooded area. Natural sunlight streams through the windows, creating dappled shadows on the furniture and floor. The ceiling is dark-colored, and the overall color scheme consists of navy blue, beige, and natural wood tones. The space is well-lit with both natural and ambient lighting, creating a cozy indoor-outdoor living environment.
A construction scene showing three caucasian male workers installing a large wooden wall panel. The workers are wearing blue jeans, work boots, and tool belts. The wall panel is made of oriented strand board (OSB) and is being lifted into place against a partially finished exterior wall. The exterior wall has exposed OSB panels and a white-framed window. The background shows a light gray house with vinyl siding and trees with green foliage. The ground is dirt and gravel, with construction debris including a red tool on the ground. The lighting shows it's daytime, with natural outdoor lighting casting soft shadows. The workers are positioned at the base of the wall panel, with one worker in a black shirt actively participating in the installation while the others are assisting.
a-photo-of-a-garage-before-and-after-its_IZo6RhXqTOG_Idmkd0AbtA_f0ZF3D2xRHiIjSxBV4GprQ (1)
A construction site photograph of a modern house under development. The structure features exposed wooden OSB sheathing and metal scaffolding. The building has multiple levels with large garage openings on the ground floor. The scaffolding is made of silver metal poles and cross-braces. The ground is unpaved with dirt and gravel scattered across the construction site. The sky is a bright, clear blue. Green foliage from trees is visible at the top right corner of the frame. The architecture has clean lines with angular roof angles and large window openings. The wooden framing creates a grid-like pattern across the exterior walls. Construction materials and debris are on the ground, including a green plastic item partially visible in the frame. The lighting is from direct sunlight, creating strong shadows and highlighting the natural wood grain of the OSB panels.
Carpenter working on ADU new kitchen

Testimonials

Our ADU Services in Orange County and surrounding areas.

We specialize in transforming underutilized garages into:

  • Studio & One-Bedroom ADUs
  • Guest Houses / In-Law Units
  • Rental Income Units
  • Home Offices or Gym ADUs
  • Detached ADU Conversions

We begin with a free on-site consultation to learn how you want to use your ADU — whether it’s for family, guests, rental income, or personal workspace. We listen closely to your lifestyle needs and budget so we can design a space that fits perfectly.

Drop Your Info and We Will Contact You.

Our 5-Step Process

  • Free Consultation – We assess your space & goals
  • Custom Design Plan – Tailored layouts to maximize ROI
  • Permit Approval – Full zoning & city permit handling
  • High-Quality Construction – Efficient, professional work
  • Final Touches & Delivery – Walkthrough & handover

Why Choose Us For The Job

Local Experts in Orange County
  • We understand the unique zoning laws, permit requirements, and architectural styles of Orange County. Our team ensures your ADU complies with all local regulations—while enhancing the beauty and value of your home.
15+ Years of Proven Experience
  • With thousands of completed garage conversions and ADUs under our belt, we know how to deliver projects that are functional, stylish, and built to last.
One-Stop Solution: Design to Delivery
  • We handle every step of the process—from design and permitting to construction and final inspection. No third parties or outsourcing—just seamless, stress-free service.

ADU Contractor Orange County: Our Thinking and Design Process

Our thinking and design process for ADU construction in Orange County is centered around your unique needs, lifestyle, and property. It all begins with a free consultation where we listen carefully to your vision—whether it’s building a rental unit, guest house, or personal workspace. From there, our expert design team creates a custom layout that maximizes space, functionality, and style, while ensuring full compliance with local zoning and building codes. We provide detailed 3D renderings so you can visualize your ADU before construction begins. Our team handles all permitting and paperwork to ensure a smooth, stress-free process. Once approved, our in-house professionals deliver high-quality craftsmanship and on-time construction—transforming your garage into a beautiful, fully livable space that adds lasting value to your home.

Guaranteed Workmanship & Transparent Pricing

With over 500 verified 5-star reviews across the web, our customers consistently praise our attention to detail, transparency, and ability to bring their vision to life. We offer clear, upfront pricing—no hidden fees. Plus, all of our work is backed by a satisfaction guarantee and workmanship warranty.

CALL NOW (424) 500-0950

Serving All of Orange County and Surrounding Areas!

✅ Irvine | ✅ Anaheim | ✅ Santa Ana
✅ Huntington Beach | ✅ Fullerton | ✅ Costa Mesa …

Not sure if we service your area?

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Power Tools We Use

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A minimalist corporate logo design featuring the text "Makita" in white lowercase letters with a modern, dynamic italicized style against a solid teal-colored background. The text has a distinctive angular, three-dimensional effect with sharp edges and clean lines. The letterforms are bold and consistent throughout, with the "i" having a small dot. A small registered trademark symbol "®" appears in white next to the text. The logo is centered in the frame and takes up approximately one-third of the image height. The teal background is a deep, rich turquoise color (#008080). The overall design conveys strength, professionalism, and industrial quality through its clean lines and professional typography.
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FAQ

Do you handle all the permits and approvals?

Yes, we take care of the entire permitting process, including architectural drawings, structural engineering, and submitting plans to your city or county for approval. You don’t have to worry about the paperwork—we’ve got it covered.

What types of ADUs do you build?

We specialize in garage-to-ADU conversions, detached ADUs, and custom living spaces such as studio units, one- and two-bedroom apartments, guest houses, and in-law suites. All designs are customized to your needs.

Can I use my ADU as a rental property?

Yes! Many homeowners in Orange County build ADUs to generate rental income. We ensure your ADU meets all legal requirements for rental use in your local area.

More Questions?

Call (424) 500-0950

Related Articles

Los Angeles, CA Home Builder ADU Expert | A1 ADU Contractor

Best ADU Contractors in Los Angeles: The Ultimate Guide to Garage Conversions, Costs, and Top Companies

Reviews & Testimonials

People Also Ask

The cost of an ADU in Orange County varies significantly based on size, design, and site conditions. For a basic, detached 500-square-foot unit, you can expect a starting range of $200,000 to $300,000. More complex projects, such as two-story or larger units with high-end finishes, can easily reach $400,000 to $600,000 or more. Key cost drivers include foundation work, utility connections, permit fees, and material choices. It is crucial to obtain detailed quotes from licensed contractors who understand local Orange County building codes and regulations. Proper budgeting should also account for potential site-specific challenges like grading, drainage, and parking requirements.

The $40,000 grant in California refers to the CalHFA ADU Grant Program, a state-funded initiative designed to help homeowners cover the pre-development and non-recurring closing costs associated with building an Accessory Dwelling Unit (ADU) or Junior ADU (JADU). This grant provides up to $40,000 as a deferred-payment loan, which is fully forgiven if the homeowner lives in either the primary residence or the ADU for five years. It is a powerful tool to make ADU construction more financially accessible, addressing housing shortages and creating rental opportunities. For a detailed breakdown of eligibility and the application process specific to your area, we recommend reading our internal article, Unlocking The $40,000 CalHFA ADU Grant For Your Sherman Oaks Property.

The cost comparison between building an ADU and buying a prefab unit is nuanced. Generally, prefabricated ADUs can be cheaper upfront due to controlled factory construction, which reduces material waste and labor time. However, site-built ADUs, while often having higher initial costs due to custom designs and on-site labor, can offer better long-term value through higher quality finishes, perfect site integration, and potentially greater property value increase. Key factors include site preparation costs (foundation, utilities) which are required for both, local permit fees, and your specific design needs. A prefab might be cheaper for a basic unit, but a custom build could be more cost-effective for complex lots or if maximizing square footage is a priority.

When comparing costs, adding on to an existing structure is often cheaper per square foot than building a standalone ADU. An addition can leverage your home's existing foundation, roof, and utility connections, which significantly reduces site work and material expenses. However, a detached ADU offers more privacy and can increase property value more substantially. The final price depends on local zoning, foundation needs, and utility runs. For a thorough cost breakdown and professional guidance, our internal article titled 'Best ADU Contractors in Los Angeles: The Ultimate Guide to Garage Conversions, Costs, and Top Companies' at Best ADU Contractors in Los Angeles: The Ultimate Guide to Garage Conversions, Costs, and Top Companies provides detailed comparisons. A1 ADU Contractor recommends getting multiple bids to see which option fits your budget and property layout best.

Finding the best ADU contractor in Orange County involves thorough research and careful vetting. Look for a licensed, bonded, and insured contractor with extensive, verifiable experience specifically in ADU construction, as local zoning and permitting are complex. Check online reviews on multiple platforms and ask for a detailed portfolio of completed ADU projects. Obtain at least three itemized bids to compare scope and cost. A top contractor will clearly explain the process, handle permits, provide a realistic timeline, and communicate proactively. Prioritize those who offer a comprehensive contract covering all phases of work, materials, and payment schedule. Personal referrals from recent clients are invaluable.

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★★★★★

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