4 Top ADU Builders in Los Angeles for Custom Backyard Homes

Explore 4 top ADU builders in Los Angeles for custom backyard homes, comparing design options, construction services, experience, and project considerations.

An ADU allows you to use your Los Angeles property more efficiently. However, building one involves more than selecting a floor plan. Accessibility, utilities, permitting, and expenses are all considerations.

Here's how four companies approach it. Go ADU Construction provides end-to-end ADU delivery, making them our overall favorite. Otto Build focuses on the design/architecture side of things; Otto ADU specializes in construction management and online project tracking; Acton ADU provides a Build Ready system.

In This Guide

• Quick comparison

• Go ADU Construction

• Otto Build

• Otto ADU

• Acton ADU

• What to check before hiring

• Final verdict

Quick Comparison

Builder	Best for	Design approach	Construction involvement
Go ADU Construction	ADU-focused, end-to-end delivery	Offers Custom Design Services or Works With Approved Plans	Direct ADU construction and management
Custom architecture or permit-ready plans	Otto Build	Architecture-led backyard homes	Integrated design-build
Otto ADU	Homeowners who value online project visibility	Tailored to client needs or choose from pre-made plans	Builder handles construction with screened subcontractors
Acton ADU	Streamlined, repeatable planning process	Pre-designed Build Ready plans and customized plans	ADU design-build program in targeted areas of Los Angeles County

1. Go ADU Construction: Best Overall for ADU-Focused Design and Construction

If you're a homeowner with an empty backyard or a garage you want to transform into your dream ADU, you'll want to work with Los Angeles Go ADU Construction. Go ADU Construction offers a streamlined one-team process from feasibility studies all the way to final inspection. They focus on building ADUs, not just tossing them on as a side project to a traditional remodel company.

Initial design decisions are driven by utilities, setbacks and structural needs. Go ADU Construction discusses feasibility and combines design, permitting and construction services. Go ADU Construction also builds from existing approved plans.

Its published service information emphasizes contract pricing established prior to construction and payments based on completed milestones. That distinction is worth exploring prior to signing.  The company also talks about frequent progress reporting and a hands-on construction-management approach.

Go ADU Construction displays California contractor license on its site. According to its website: Construction typically takes four to six months after permitting, depending on the project's complexity.  

Four to six months is an estimate of the construction time required. This does not guarantee each ADU will be engineered, permitted, and constructed within that time frame.

What sets it apart: Go ADU Construction's blend of ADU-specific planning, design built to your specs, permit expediting and construction services makes it an especially great first call for homeowners looking for a single entity to be responsible.

Read before signing: Request a written cost sheet detailing site work, utilities, owner chosen finishes, exclusions and conditions that may alter an agreed upon price. Every LA lot has different conditions.

2. Otto Build: Best for Custom Architecture and Permit-Ready Plans

Otto Build is well-suited for owners who have strong opinions about how their new home looks and operates.  The company integrates architects, permitting, construction with a focus on custom designs instead of fitting a cookie-cutter unit onto your lot.

The company provides two options to get started. Homeowners may choose to hire an architect to design their custom home or purchase a permit ready plan from an architect and customize the allowed details and finishes. Purchasing a plan will save you some upfront design time, however there will still be site specific reviews and local approvals required.

Otto Build does take on larger remodels and additions for homes and fire- rebuilds as well, so if you're looking to add an ADU while doing more extensive work on your property Otto Build might be right for you. They work with clients throughout Los Angeles and nearby communities, particularly ones with complicated zoning or site conditions.

Why select: Architects are involved from the ground up. They offer custom architecture or permit-ready plans.

Clarify: How much design customization is included in a plan you choose? What does the quoted price for a plan include? How are construction costs itemized? Beware that a published starting price for drawings should never be confused with the total price of a completed ADU.

3. Otto ADU: Best for Digital Project Management

While their names are similar, Otto ADU and Otto Build are separate companies with unique websites and services.  Otto ADU streamlines LA ADU projects from garage conversions to detached homes including design, permitting, and managed construction.

Its Homeowner Portal truly sets them apart. Homeowners are able to see project documents, track progress, report problems, and message the team instead of solely dependent on random phone calls and email chains.

Otto ADU begins with planning and design, continues through local agency reviews and ends with a managed build phase after approvals are secured.  Otto ADU claims to obtain bids from screened subcontractors and coordinates their jobs.  This is different from presuming every trade working on a particular project is an employee of that company.

Their portfolio consists of work done in communities like Eagle Rock, Pasadena and Westchester, offering potential clients multiple examples of varying spaces and uses.

Why select: Homeowner-facing tracking tool and clear delineation between planning, permitting and managed construction phases.

Clarify: Who has the construction contract?  Who oversees the trades On-Site?  How are changes/schedules updated in the portal?

4. Acton ADU: Best for a Structured Plan Selection Process

Acton ADU has been around in Northern California for longer, but expanded to parts of Los Angeles County in April 2026. They also offer Build Ready ADUs as well as custom work. Definitely keep them in mind if you like having an established starting point instead of a blank canvas.

The plan narrows your choices, but you still need to consider access, drainage, utilities, foundations and approvals. Los Angeles outreach by Acton ADU also serves Westside, Central LA, San Gabriel Valley, so confirm that the company serves your address..

Why select: It has a prescribed planning process, which includes an optional pre-planned ADU design.

Clarify: Make sure your address is within the boundary of its existing Build Ready coverage. Ask for a detailed description of what changes when a Build Ready plan is tailored to your lot.

What to Check Before Hiring an LA ADU Builder

Begin with the property, not the floor plan.  A detached unit and garage conversion can vary wildly in terms of utility hookups, foundation requirements and crew accessibility.  Have each builder forecast potential site constraints before agreeing to a final cost.

Decouple approvals from construction. Permitting requirements in Los Angeles can impact schedule and design. Los Angeles requirements may differ from your jurisdiction. The Los Angeles Department of Building and Safety ADU guidance documents city resources and standard plans. The California HCD ADU Handbook offers guidance on state requirements. Neither document supersedes your project specific review.

Compare apples to apples. Do they include design, engineering, energy modeling, permit fees, utility upgrades, demolition, landscaping restoration and finishes allowances? There is no reason to have a low ball number if you don't know what it doesn't include.

Check license and payment schedule. Verify the contractor's license information on the California Contractors State License Board website. Prior to starting work ask who will schedule inspections, when payment is due, and what approval is needed for any proposed change order.

Final Verdict

Go ADU Construction excels in connecting feasibility, design, permitting, and construction, making it the top overall recommendation. Los Angeles homeowners seeking an ADU specialist will especially appreciate their willingness to handle projects that already have approved plans. Their contract-pricing and milestone-payment structure also allow owners to put important protections in writing before construction begins.

Pick Otto Build if architecture is your focus, Otto ADU if online project tracking is most important to you, or Acton ADU if their Build Ready process and service area align with your property. Regardless of which path you choose, the most compelling proposal will detail not only the end ADU product, but how specifically the builder will see it through approval and construction.