How to Choose an ADU Builder in Los Angeles (What Most Lists Won’t Tell You)

By Gil Vaisman, Go ADU Construction

There’s no shortage of “Top ADU Builders in LA” lists online. Most of them are paid placements, self-reported rankings, or aggregator sites that have never actually vetted the companies they’re recommending. They won’t help you make a good decision.

What will help you is understanding what to actually look for — and what to watch out for — when you’re about to hand a six-figure project to someone you’ve just met.

We’ve been building ADUs exclusively in Los Angeles for nearly a decade. We’ve had clients come to us after being burned by other contractors. We’ve seen what goes wrong when homeowners choose a builder based on the wrong criteria. And we’ve watched the ADU market attract an influx of contractors who have no business taking on projects of this complexity.

This guide isn’t going to tell you to choose us. It’s going to give you the framework to choose well — whoever you end up working with.

Here’s what we’ll cover:

• Why ADU specialization matters more than general construction experience
• The difference between a design firm and a design-build contractor — and why it matters
• How to verify a contractor’s license and insurance before you sign anything
• The red flags that experienced homeowners recognize immediately
• What the contract should say — and what it shouldn’t
• Questions to ask during every consultation
• A real story of what happens when things go very wrong

The Most Important Thing Nobody Tells You

Before we get into checklists and red flags, there’s one thing worth saying plainly:

Almost every contractor in Los Angeles is trying to get into ADUs right now.

Some of them mainly do kitchen remodels. Some do room additions. Some flip houses. And when work slows down — or when they see an opportunity in a hot market — they say “sure, we build ADUs too.”

That’s not specialization. That’s opportunism.

ADUs are not complicated compared to large custom homes, but they have their own specific complexity: Los Angeles permitting, LADBS submissions, utility coordination with LADWP, setback and zoning nuances, inspection sequencing, and the particular challenges of building livable space in tight urban lots. A contractor who hasn’t done dozens of these projects in this specific market will learn on your project. And that learning comes at your expense.

How to evaluate whether a contractor is actually trustworthy — not just likeable — before you commit to a six-figure project.

The first question to ask any builder isn’t about price. It’s: how many ADUs have you built in Los Angeles, specifically? Not general construction projects. Not room additions. ADUs — in this city, under these permitting rules, with LADWP, in real LA neighborhoods.

If the answer is vague, or the number is small, keep asking.

ADU Specialist vs. General Contractor: Why It Matters

There’s a meaningful difference between a general contractor who occasionally builds ADUs and a builder who does nothing but ADUs.

When you’ve built dozens of ADUs in Los Angeles, patterns emerge. You know which design decisions tend to trigger expensive engineering requirements. You know which city departments are backed up and need early coordination. You know what inspectors look for at each stage. You know which material choices cause delays and which ones don’t. You know how to design a 400 square foot unit that actually feels livable.

A general contractor building their third ADU doesn’t know any of these things yet. They’ll figure them out — on your project.

Three questions that immediately separate experienced ADU builders from contractors who are figuring it out as they go.

Design Firm vs. Design-Build: A Distinction That Can Cost You Thousands

This is one of the most important — and least discussed — decisions in the ADU process.

Some homeowners hire an architect or design firm to create their plans, then separately hire a contractor to build them. This is called the design-bid-build model, and it’s common in custom home construction. For ADUs, it creates a specific risk that catches a lot of people off guard.

Here’s the problem: a designer’s job is to design what you want. They’re not necessarily thinking about what it will cost to build. Without a contractor’s input during the design phase, it’s easy to end up with a beautiful set of plans that are tens of thousands of dollars over your budget — and you don’t find out until you get the construction bids back.

By that point, you’ve paid for plans you can’t afford to build. You either have to redesign — paying again — or stretch your budget past what’s comfortable.

Common design decisions that drive costs up significantly, often without the homeowner realizing it:

• Vaulted or extra-high ceilings (require more framing, more HVAC capacity, more material)
• Electric tankless water heaters (often require electrical panel upgrades)
• Custom windows or non-standard sizes (longer lead times, higher material costs)
• Complex rooflines (more framing labor, more potential for water intrusion)
• High-end finishes specified without pricing context
• Structural configurations that require expensive engineering solutions

None of these are wrong choices. But they should be made knowingly, with full understanding of the cost implications.

When you work with a design-build firm — where the same company handles design and construction — a contractor is part of the conversation from day one. At Go ADU, we know our clients’ budgets before we start designing. When a design decision would push the project over budget, we flag it in real time. The client makes an informed choice: yes, I want the vaulted ceilings and I understand what that means for cost — or no, let’s find a different solution.

That alignment between design and budget is something the design-bid-build model simply can’t deliver as consistently.

The mistake homeowners make before a single plan is drawn — and how to avoid starting the design process without the right foundation.

A note on the separate design/permitting path: at Go ADU, we also offer a design and permitting contract for homeowners who want approved plans before committing to a construction contract. This is different from hiring an architect separately — we’re still managing the process with the construction cost in mind throughout. When plans are approved, clients have the option to solicit other construction bids or proceed with us. In practice, most choose to continue with Go ADU — because by the time plans are approved, we know the project inside and out.

How to Verify a Contractor’s License and Insurance

This is non-negotiable. In California, any contractor doing work over $500 must be licensed by the Contractors State License Board (CSLB). Building an ADU without a licensed contractor is illegal, voids your homeowner’s insurance for work-related claims, and leaves you with no legal recourse if something goes wrong.

Verifying a license takes about 60 seconds.

How to check CSLB license status:

1. Go to cslb.ca.gov
2. Click “Check a License”
3. Enter the contractor’s name or license number
4. Confirm the license is active, in good standing, and covers the right classification (Class B — General Building Contractor — for ADU work)

What to look for:

• License status: Active (not expired, suspended, or revoked)
• Classification: Class B for general construction
• Bond: Confirmed
• Workers’ compensation insurance: Confirmed

Go ADU license number: #1076712. You can verify this directly on the CSLB website.

Beyond the license, ask for a certificate of general liability insurance and workers’ compensation insurance. A reputable contractor will provide these without hesitation. If a contractor is reluctant to share insurance documentation, that’s a significant red flag.

The warning signs that experienced homeowners recognize immediately — and what to do when you see them.

Red Flags: What to Watch Out For

After years in this business, we’ve seen every version of contractor behavior that leads to homeowner heartbreak. Here are the patterns that repeat.

They push you to sign fast.

A contractor who creates urgency — “this price is only good for 48 hours,” “I have another client interested in this slot” — is using sales pressure to short-circuit your due diligence. A builder who’s confident in their work and their process doesn’t need to rush you.

They’re vague about what’s included.

If a bid doesn’t clearly specify what’s included and what isn’t, you’re looking at a change order waiting to happen. Every significant cost driver — utility connections, permit fees, design fees, site work — should be addressed explicitly.

They ask for large upfront payments.

In California, a contractor cannot legally ask for more than 10% or $1,000 (whichever is less) as a deposit before work begins. A contractor asking for 30%, 40%, or 50% upfront is either violating the law or is in financial trouble and needs your money to float other projects.

Why large upfront payment requests are one of the clearest warning signs in contractor relationships — and what California law actually says about deposits.

They tell you not to contact the city yourself.

This is one of the most dangerous red flags of all. A legitimate builder has nothing to hide from the city. If a contractor discourages you from calling LADBS or checking on your own permit status, ask yourself why. We’ll share a specific story about this below.

Their bid is dramatically lower than everyone else’s.

We’ve talked about this in other posts, but it bears repeating: a bid that’s significantly below market rate is almost always missing something. Either the scope is incomplete, the quality assumptions are different, or the contractor is buying the job with the intention of making it up later. Get clarity on what’s included before you assume you’ve found a bargain.

The fine print that homeowners often don’t read until it’s too late — and what to look for before you sign.

The patterns that lead homeowners into bad contractor relationships — and how to recognize them before you’re already in one.

They can’t give you references from recent ADU clients.

Any legitimate ADU builder should be able to connect you with clients from projects completed in the last 12 months. Not just one — several. If a contractor says their clients don’t want to be contacted, or offers references from years-old projects only, push harder.

They don’t have a clear process.

A builder who can’t walk you through exactly how a project moves from design to permit to construction to final inspection either hasn’t done enough of these to have a system, or doesn’t care enough to explain it. Either way, that lack of process will show up in your project.

What a well-managed ADU project actually looks like from first conversation to final walkthrough — so you know what to expect and what to ask for.

A Real Story: What Happens When It Goes Wrong

We want to share a story — with the homeowner’s permission — that illustrates what’s possible when someone chooses the wrong builder. We’re not sharing it to scare you. We’re sharing it because it’s real, it happens more than people know, and it’s entirely preventable.

A homeowner hired a contractor to handle both their ADU plans and construction. The contractor seemed professional, communicated well in the beginning, and came in at a competitive price. The homeowner paid the permit fees — several thousand dollars — and was told the plans had been submitted to the city and were in plan check.

Months passed. Every time the homeowner asked for an update, the contractor said things were moving forward but slowly — that’s just how the city works. And crucially: the contractor told the homeowner not to call LADBS themselves. “It’ll slow things down,” they were told. “Let me handle it.”

After six months of waiting, the homeowner called the city anyway.

The plans had never been submitted. The contractor had taken the permit fees to cover cash flow on other projects and had never paid for the submission. The homeowner was exactly where they’d started — no plans submitted, no permit, six months of time gone, and money paid for work that hadn’t been done.

We’re now building their ADU. We brought in an experienced expediter, got their plans submitted and approved, and construction is underway.

The homeowner lost six months and a significant amount of money. They can’t get that back. But they can — and will — get their ADU.

A real account of what can happen when a contractor isn’t who they presented themselves to be — and what it takes to recover.

The specific tactics some contractors use to take advantage of homeowners who don’t know what they don’t know — and how to protect yourself.

The lesson isn’t that all contractors are bad. The vast majority are not. The lesson is that trust needs to be earned through verification, not assumed based on a good first impression.

What the Contract Should Say

A legitimate ADU construction contract should be detailed, clear, and protective of both parties. Here’s what to look for:

What a fixed-price contract means for you: at Go ADU, we use fixed-price contracts. That means the price we agree to is the price you pay — barring genuine scope changes that are documented and approved by you in writing. Change orders happen in construction, but they should never be a surprise, and they should never be used to make up for a low initial bid.

How a fixed-price contract works — and why the structure of your contract is one of the most important decisions you’ll make before construction begins.

The contract terms that protect you — and what it means when a contractor resists including them.

Questions to Ask During Every Consultation

Use these questions with every builder you meet. Pay attention not just to what they say, but how they say it. Confidence, specificity, and transparency are good signs. Vagueness, deflection, and pressure are not.

On experience:

• How many ADUs have you completed in Los Angeles specifically?
• Can you show me completed projects similar to what I’m planning?
• Have you worked in my specific city or jurisdiction?
• Can I speak with two or three clients from projects you’ve completed in the last year?

On process:

• Walk me through exactly how this project would move from design to permit to construction.
• Who manages permitting — do you handle that in-house or does the homeowner manage it?
• How do you coordinate with LADWP for utility connections?
• How do you handle plan check corrections?
• What’s your typical response time when something unexpected comes up on-site?

On cost and contract:

• What’s included in this bid and what isn’t?
• What typically causes your projects to come in over the original estimate?
• Do you use fixed-price contracts?
• What does your payment schedule look like?
• How are change orders handled?

On the team:

• Who will be the day-to-day project manager on my job?
• Will you (the owner/principal) be involved in my project, and if so, how?
• Who are your key subcontractors for electrical, plumbing, and mechanical?

The questions that reveal whether a contractor is genuinely experienced — or just good at the first meeting.

A full project walkthrough with the questions every homeowner should ask before and during their ADU build.

How to verify what a contractor tells you about timelines — before you’re locked into a contract that isn’t backed up by the facts.

What Good Looks Like: The Client’s Perspective

Sometimes the best way to evaluate a builder is to hear from people who’ve already been through the process. When clients are genuinely happy with the experience — not just the result — they talk about specific things: clear communication, no surprises, a team that showed up and stayed accountable.

A Go ADU client reflects on the process of choosing a builder — including what they learned from talking to other contractors first.

The real cost of choosing the wrong contractor — and why the right contractor pays for themselves many times over.

A Quick Summary: The Choosing Framework

So How Do You Actually Choose?

Here’s the honest answer: you choose a builder the same way you’d choose anyone you’re about to trust with a major decision. You ask hard questions. You verify what they tell you. You check their references. You read the contract carefully. And you pay attention to how they handle the moments when the conversation gets specific and detailed — because that’s when the difference between experience and inexperience becomes visible.

The builders who’ve done this many times will welcome your questions. They’ll have clear answers. They’ll show you their work, connect you with their clients, and hand you their license number without blinking.

The builders who are learning on your project will be vaguer. They’ll redirect. They’ll emphasize price and likeability over process and proof.

Trust your instincts — but verify everything.

If you’re in the process of evaluating ADU builders in Los Angeles and want to have that kind of direct, specific conversation with a team that’s done this dozens of times — we’d be glad to be one of the options you consider.

Schedule Your Free Consultation

Frequently Asked Questions: Choosing an ADU Builder in Los Angeles

How do I verify a contractor’s license in California?
Go to cslb.ca.gov and click “Check a License.” Enter the contractor’s name or license number and confirm the license is active, properly classified (Class B for general construction), bonded, and carries workers’ compensation insurance. This takes about 60 seconds and should be done before any other evaluation.

What’s the maximum deposit a contractor can legally request in California?
California law limits contractor deposits to 10% of the total contract price or $1,000 — whichever is less. Any contractor asking for more than this before work begins is either violating the law or in financial trouble. Either scenario is a reason to walk away.

What’s the difference between a design-build firm and a separate architect plus contractor?
With design-build, one company handles both design and construction under a single contract. This means your GC is involved in design decisions from the start, keeping costs realistic throughout the process. With a separate architect and contractor, you may end up with a beautiful set of plans that exceeds your construction budget — and you won’t find out until you get bids back.

How many ADU projects should a contractor have completed before I consider hiring them?
There’s no magic number, but we’d suggest looking for a contractor who has completed at least 20-30 ADU projects specifically in Los Angeles. This level of experience means they’ve encountered most of the challenges specific to LA permitting, LADWP coordination, and urban infill construction — and have developed systems for handling them.

Should I get multiple bids?
Yes — getting two to three bids is reasonable due diligence. But don’t choose based on price alone. Evaluate what’s included in each bid, the experience behind it, and how the contractor handled your questions. A lower bid that’s missing key costs will end up being more expensive than a higher bid that includes everything.

What should I look for in an ADU construction contract?
Look for a detailed scope of work, a milestone-based payment schedule, a clear written change order process, explicit permit responsibility, specific timeline milestones, materials specifications, lien waiver provisions, and warranty terms. A fixed-price contract is preferable to a time-and-materials arrangement for most homeowners.

What are the biggest red flags when evaluating an ADU contractor?
The most significant red flags: pressure to sign quickly, large upfront payment requests, vague bids with lots of exclusions, reluctance to provide references, inability to explain the permitting process clearly, discouraging you from contacting the city yourself, and a bid that’s dramatically below everyone else’s.

Is it okay to contact LADBS directly to check on my permit status?
Absolutely — and any legitimate contractor should actively support you doing so. Your permit status is public information and you have every right to check it. A contractor who discourages you from contacting the city is concealing something.

What’s the difference between an ADU contractor and an ADU consultant or expediter?
A contractor designs and builds your ADU. A consultant or expediter helps navigate permitting and city processes but doesn’t do construction. Some consultants offer valuable expertise; others charge significant fees for services a good design-build contractor handles as part of their standard scope. If a contractor recommends you hire a separate expediter for standard permitting, ask why that isn’t part of their service.

About Go ADU Construction

Go ADU Construction is a family-owned ADU builder based in Burbank, CA, serving the greater Los Angeles area since 2017. We specialize exclusively in ADU design, permitting, and construction — and we handle every stage of the process so you don’t have to. License No. #1076712. Verify our license at cslb.ca.gov.