ADU Accessory Dwelling Unit

Los Angeles ADU Experts

We handle design, permits, and construction for a seamless, high-quality ADU

7+ Years of Trusted Roofing Experience

Safe & Durable Solutions

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Premium Materials for Maximum Durability

“SH Quality Roofing transformed our old roof into something brand new. Professional, fast, and absolutely reliable!” – Sarah M.

At Builders turned our renovation idea into a stunning space. The team communicated clearly, stayed on budget, and delivered excellent quality work. Highly recommend their reliable service.

Michael R.

Homeowner

Our home addition was completed exactly as promised. The crew was respectful, skilled, and organized. We’re very happy with the craftsmanship and final outcome.

Sarah L.

Property Owner

From design to finishing touches, At Builders handled everything with care. The project was on time, on budget, and beyond our expectations.

Daniel P.

Real Estate Investor

UNLOCKING THE POTENTIAL OF ACCESSORY DWELLING UNITS (ADUS) IN

LOS ANGELES COUNTY

What is an Accessory Dwelling Unit (ADU)?

ADUs, often referred to as granny flats, in-law suites, or backyard cottages, are versatile living spaces that can be either attached to or detached from your primary residence. In Los Angeles County, these structures offer homeowners unique opportunities for maximizing their property’s potential. ADU Los Angeles Contractors knows the benefits of building and ADU.

Simple. Smart. Quality ADUs.

Smart, Functional ADU Designs

Thoughtfully planned layouts that maximize space, light, and comfort.

On Time & On Budget

We plan every phase carefully to deliver your ADU as promised with no hidden costs or delays.

Expert Craftsmanship

Every detail is handled with precision and care to ensure lasting quality and a flawless finish.

Guaranteed on-time completion

If we miss your ADU deadline, we pay you $50 per day until the project is finished.

Direct communication with me and my team

You’ll work directly with the people designing and building your ADU, with clear and consistent updates.

Only 2 ADU clients per month

We limit our build schedule so every project gets full attention, better execution, and higher quality results.

Deep-clean, move-in ready delivery

Your ADU is delivered clean, finished, and ready to use the moment we hand it over.

Types of ADU’s

Detach ADU

A detached ADU adds value, privacy, and flexibility to your property. It’s perfect for guests, family, or rental income offering an independent, energy-efficient space that enhances your home and future investment.

Garage conversion

Transform your garage into a stylish living space or rental unit — a fast, affordable way to add value and comfort to your home.

Attached ADU

An attached ADU adds connected living space for family, guests, or rental income while increasing your home’s value and functionality.

Why AT Builders?

At AT Builders LLC, construction isn’t just what we do—it’s who we are. Born from a family tradition and a passion for building, we are dedicated to crafting homes that blend luxury with livability. From new construction and custom homes to renovations and ADUs, every project is approached with the same commitment: to create spaces that inspire and stand the test of time.

Serving the greater Los Angeles area, we pride ourselves on trust, craftsmanship, and transparency. Our clients aren’t just building projects—they’re building dreams. We’re honored to bring those visions to life with precision, care, and a personal touch that makes every home uniquely theirs.

Expertise

With years of hands-on experience in ADU design and construction, our team understands every detail — from city permits to modern layouts. We combine technical skill with creative insight to deliver ADUs that maximize space, function, and comfort while fitting seamlessly into your property.

QUALITY

At AT Builders, quality isn’t just a goal — it’s our foundation. We use premium materials, proven building methods, and detailed craftsmanship to ensure your ADU is built to last. Every project is completed with precision, transparency, and care from start to finish.

Portfolio

Our portfolio speaks for itself. From detached backyard units to garage conversions and room additions, our completed ADUs showcase both versatility and excellence. Explore our projects to see how AT Builders transforms ordinary spaces into modern, livable extensions of your home.

About Us

Frequently Asked Questions

Get answers to the most common questions homeowners have about building an ADU with AT Builders.

A Design-Build firm like AT Builders handles your entire ADU project—from initial design and city permits to final construction—all under one roof. This streamlined approach saves you time, money, and stress.

Costs depend on size, layout, finishes, and site conditions. On average, ADU projects in Los Angeles range from $150K to $300K. We provide transparent, itemized estimates so you know exactly what to expect before construction begins.

Most ADUs take 6–8 months from design to completion, depending on permitting and complexity. Our team keeps you informed every step of the way through our project management portal.

Yes, we take care of all city permits, plans, and required inspections. Our in-house experts ensure your ADU meets local zoning and building codes for a hassle-free experience.

AT Builders provides a 1-year workmanship warranty and a 10-year structural warranty for peace of mind. We stand behind our work long after your ADU is complete.

CONTACT US

Ready to take the next step towards unlocking the potential of your property with an ADU? Contact us today to start your ADU project journey. We’re here to answer your questions, provide expert guidance, and turn your ADU dreams into reality. At Builders – we’re here for you.