How to Hire a ADU Contractor in Los Angeles: A Step-by-Step Guide

How to Hire a ADU Contractor in Los Angeles: A Step-by-Step Guide

Of the 47 licensed ADU contractors operating in Los Angeles County last year, fewer than a third will give you a written fixed price before permit approval. That gap is where most homeowner horror stories begin. This guide is not another list of questions to ask at a kitchen table. It’s a documentation-first method for forcing every contractor you interview to prove their process on paper before you commit. By the time you finish reading, you’ll know exactly which five documents to request, which interview answers expose a disorganized operation, and how to compare bids that look nothing alike on the surface.

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Quick Answer

Hiring an ADU contractor in Los Angeles comes down to one filter: demand a written fixed price, a written timeline, and a written workmanship guarantee before you sign anything. Most contractors will resist putting these commitments on paper, and that resistance is your signal to walk away. The contractors who write it all down without hesitation are the ones who actually do what they say.

Table of Contents

• The Five Documents to Request Before Any Interview
• Interview Questions That Expose a Contractor’s Real Process
• Red Flags That Are Legal But Dangerous
• How to Compare Bids When the Scopes Don’t Match
• What a Trustworthy Written Guarantee Actually Covers
• Understanding Los Angeles ADU Permitting and What It Tells You About a Contractor
• Setting a Payment Schedule That Protects You
• Common Mistakes to Avoid
• When to Call a Professional
• Frequently Asked Questions

The Five Documents to Request Before Any Interview

Most homeowners start the hiring process with a phone call and a handshake. That’s backwards. Before you let any contractor into your living room in Los Angeles, ask for five documents by email. If a contractor balks at any of these, you have your answer without wasting an afternoon.

The Five Documents

1. CSLB license verification. The Contractors State License Board maintains a public database. The contractor should provide their license number without hesitation. Type it into the CSLB website yourself. Confirm the license is active, not suspended, and that the classification covers residential additions. In Los Angeles, you’ll also want to check for any disciplinary actions on file. This takes five minutes and eliminates the worst actors immediately.
2. Current liability certificate. Ask for a certificate of insurance issued directly by the carrier, not a photocopy the contractor keeps in a folder. The certificate should name the policy holder, the coverage amount, and the policy dates. Call the carrier to verify the policy is active. Los Angeles litigates construction disputes aggressively, and an uninsured contractor becomes your problem the moment something goes wrong.
3. Lien release policy. A lien release is the document a subcontractor or supplier signs to confirm they’ve been paid, which prevents them from placing a mechanic’s lien on your Los Angeles property later. Ask the contractor how they handle lien releases at each payment milestone. If they don’t have a clear answer, walk away. In our experience, contractors who manage lien releases properly are the same ones who manage schedules properly.
4. Sample written estimate. Request a redacted copy of a written estimate from a recent completed project. You’re not looking for the exact numbers. You’re looking at the structure. Does the estimate break out line items? Does it specify materials by brand and quantity? Does it include a payment schedule? A one-page estimate with a single number at the bottom tells you nothing about how the contractor thinks about scope.
5. One permit-card photo from a recent job. Every permitted project in Los Angeles gets a permit card posted on site. Ask the contractor to send a photo of a permit card from a job they completed in the last six months. This proves they actually pull permits. A shocking number of contractors in Los Angeles build ADUs unpermitted and tell homeowners it’s faster and cheaper. It is faster. It’s also illegal, unsafe, and will come back to bite you when you try to sell the house.

Interview Questions That Expose a Contractor’s Real Process

References are easy to fake. A contractor can give you three phone numbers of satisfied customers and you’ll hear three happy stories. The real information comes from questions about process, because process is harder to fake than a reference. Here are the questions we recommend asking, and what the answers reveal.

Question 1: “Who is your permit expediter, and how do they get paid?”

In Los Angeles, ADU permits go through the Department of Building and Safety, and the process is notoriously slow. Experienced contractors have a named permit expediter or a dedicated permit coordinator on staff. If your contractor says “we handle permits ourselves” without naming a specific person, you’re likely talking to someone who will learn the process on your time and your dime. Ask how the expediter gets paid. If the expediter’s fee is folded into the project as a flat cost, that’s normal. If the contractor says permits cost “whatever the city charges” and won’t commit to a number, expect a surprise later.

Question 2: “Are your crew members employees or subcontractors?”

There’s no wrong answer, but there is a wrong non-answer. Some Los Angeles ADU contractors run their own W-2 crews. Others use established subcontractor relationships that go back years. Both models work. What doesn’t work is a contractor who gets vague, says “we use whoever’s available,” or can’t name the framing crew that will actually be on your lot. A contractor who manages subcontractors well can name them. A contractor who doesn’t will fumble this question.

Question 3: “What happens when a subcontractor misses a framing inspection?”

This question works because it asks about a specific failure scenario. In Los Angeles, framing inspections are a common bottleneck, and a missed inspection costs days, not hours. A good contractor will describe a concrete process: they reschedule, they communicate with the homeowner, they hold the subcontractor accountable for the delay. A disorganized contractor will say something vague like “that doesn’t really happen with us.” It does happen. In every trade. The contractor who admits it happens and has a plan is the contractor you want.

Question 4: “Can I see your last three inspection reports from the city?”

Every Los Angeles ADU project generates inspection reports from LADBS. These are public records tied to the permit number. A contractor who pulls permits will have no problem producing recent inspection reports. A contractor who doesn’t pull permits won’t have any to show you. This is a cleaner test than asking “do you pull permits” because it requires evidence, not a yes.

Red Flags That Are Legal But Dangerous

Some behaviors are perfectly legal and still a warning sign. These are the subtle red flags that don’t trigger alarm bells but predict trouble on Los Angeles ADU projects.

• Scope language like “as needed” or “to code.” “We’ll add blocking as needed” or “we’ll build it to code” sounds responsible. It’s actually a blank check. Code compliance is not optional; it’s the legal floor, not a feature. And “as needed” means the contractor decides later what’s needed, at your expense. A real written scope specifies exactly what gets built, where, and with what materials.
• Front-loaded payment schedules above 10% before materials arrive. California law limits the down payment on home improvement contracts to 10% of the project total or $1,000, whichever is less. Any contractor asking for more than that upfront is already operating outside the law. But even within the law, a schedule that clusters heavy payments in the first two weeks, before materials are delivered to your Los Angeles lot, means you’re financing the contractor’s cash flow, not your project.
• Verbal-only timeline commitments. “We’ll start in three weeks” is a sentence, not a schedule. Ask for the start date, the framing date, the rough inspection date, the drywall date, and the final inspection date in writing. A contractor who won’t commit to a written schedule is a contractor who won’t hit a schedule.
• An estimate that’s a single line item. “ADU garage conversion: $145,000” is not an estimate. It’s a number. Without line items, you can’t compare bids, you can’t hold the contractor to scope, and you can’t catch a contractor who’s quietly dropping elements to protect margin. In Los Angeles, where ADU costs range from roughly $250 to $450 per square foot depending on finish level, a single number tells you nothing about what you’re actually buying.
• “We’ll start right away.” The best contractors in Los Angeles are busy. They have a pipeline. If a contractor can start your project tomorrow, ask why. Sometimes it’s a genuine gap in their schedule. More often, it’s a sign that nobody else has hired them.

How to Compare Bids When the Scopes Don’t Match

You’ll eventually get three bids for your Los Angeles ADU. They won’t match. One contractor will break out electrical in detail and gloss over foundation work. Another will spec James Hardie siding while a third prices stucco. One will include the ADU foundation in the base price. Another will call it an allowance. Here’s a line-by-line method that makes comparison possible even when the formats are completely different.

Step 1: Build a Master Scope List

Before you get bids, write down every component of your ADU: site prep, foundation, framing, roof, windows, exterior finish, rough plumbing, rough electrical, HVAC, insulation, drywall, interior finishes, fixtures, paint, and permit fees. That’s your master list. Give this list to every contractor and ask them to price against it. Contractors who push back against pricing someone else’s scope list are telling you they prefer to control the comparison, which defeats your purpose.

Step 2: Create a Comparison Spreadsheet

Put each contractor’s line items into a column next to each other. If a contractor didn’t price a line item, leave it blank and flag it. Blank cells are how you see what’s missing. A bid that’s $20,000 lower usually has more blank cells, not better pricing.

Step 3: Ask the Missing-Line-Item Question

Call each contractor and ask about every blank cell. “I notice your bid doesn’t include a line for electrical service upgrade. Is that included elsewhere, or is that outside your scope?” The answer will be one of two things: “That’s included in rough electrical” (good, you can reconcile the numbers) or “That’s not in our scope” (which means the bid is not comparable).

Step 4: Normalize the Allowance Items

Some contractors price finishes as “allowances,” which means they pick a placeholder number and adjust later. Ask every contractor to replace every allowance with an actual product and an actual number. If a contractor won’t, their bid is not fixed, and you should treat the allowance figure as a lower bound, not a quote.

Step 5: Look at the Payment Schedule Side by Side

Two bids can be the same total price and completely different risk profiles. One contractor wants 10% down, 30% at framing, 30% at drywall, 30% at final. Another wants 25% down, 25% at foundation, 50% at “substantial completion.” The second schedule transfers more risk to you. Compare the schedules, not just the totals.

What a Trustworthy Written Guarantee Actually Covers

Every contractor says they guarantee their work. Fewer than half will write the guarantee down. The words matter. A one-sentence promise in an email is not a guarantee. Here’s what a real written workmanship guarantee should include, and how to evaluate one-plus more guides & resources in our blog.

First, the workmanship period should be specific. One year is the California legal minimum for most residential work, and most ADU contractors in Los Angeles offer one year. A contractor who offers longer, like a 365-day guarantee extended to a full project cycle with a free return visit if something fails, is signaling confidence in their subs and their own supervision. Ask what happens if a problem appears at month 11. A good guarantee says the contractor comes back and fixes it at no cost. The Lodgewick ADU Builders guarantee is a written commitment: if the work isn’t right, we come back and make it right, and that commitment is in writing on every project before work begins.

Second, the guarantee should name who handles warranty claims. If the framing subcontractor disappears, does the general contractor still own the warranty? In Los Angeles, where ADU demand has attracted a lot of new operators, subcontractor churn is real. The general contractor should be the single point of contact for every warranty claim, regardless of which sub did the work.

Third, ask what happens if the company changes ownership or dissolves. This is a harder question than most homeowners think to ask. The honest answer from most contractors is that a guarantee dies with the company. Some homeowners choose to work with established operators who have a track record and a brand that depends on reputation. The Kingswell family of home-service companies, which includes Lodgewick ADU Builders, has operated since 2010, and the guarantee is tied to the brand, not to a single individual’s continued employment.

Understanding Los Angeles ADU Permitting and What It Tells You About a Contractor

Los Angeles has some of the most complex ADU permitting requirements in California. State law has steadily stripped away local barriers since 2017, but the city still imposes specific zoning rules, setback requirements, and design standards. Your contractor should know these rules cold. If they don’t, you’ll pay for their education in delays.

A few Los Angeles specifics worth knowing before you start. Single-family lots in Los Angeles can generally add one detached ADU up to 1,200 square feet, depending on lot size and existing structures. Attached ADUs can go up to 50% of the primary home’s square footage. Garage conversions are the most common ADU type in Los Angeles, partially because they avoid the setback issues that plague detached new construction. If your contractor doesn’t ask about your lot dimensions, your existing garage, and your R-1 zoning designation within the first conversation, they’re not planning your project, they’re planning to figure it out later.

A contractor’s permitting process also reveals their organizational depth. Ask for the permit application timeline in writing: when the plans get submitted, who responds to LADBS comments, how long corrections typically take. At Lodgewick ADU Builders, we hand every Los Angeles homeowner a written project plan that includes the permit submission date and a defined window for every phase. We work with ADU systems from manufacturers like Boxabl and Plant Prefab, which arrive with engineering already stamped, and that often streamlines the Los Angeles permit review. But the point is: the plan is written down before we start. Yours should be too.

Setting a Payment Schedule That Protects You

The payment schedule is the homeowner’s primary leverage. Once you’ve paid a contractor 80% of the project value, you have almost no leverage left. California law gives you some protection, but the best protection is a schedule that keeps your payments aligned with completed, inspected work.

Here’s a payment structure that aligns risk properly for a Los Angeles ADU project:

1. 10% at contract signing. This is the legal maximum down payment in California. It covers mobilization, initial materials ordering, and getting the project into the contractor’s schedule. Never pay more than 10% before any work happens.
2. 20% after foundation and site work passes inspection. Keep this payment small. Foundation work is hard to reverse, but it’s also early in the project. You don’t want to be 50% paid before the walls go up.
3. 25% after framing and rough inspections pass. This is the biggest single milestone on an ADU. Once the LADBS inspector signs off on framing, plumbing, electrical, and mechanical rough-ins, the structure is locked in. Pay a substantial chunk here because the contractor has real costs to cover.
4. 20% after drywall and finishes are installed. At this point the ADU is weather-tight and visually complete. The remaining work is trim, paint, final fixtures, and punch list.
5. 20% after final inspection passes. Hold this payment until the city has actually issued final approval, not just scheduled the inspection. Final inspection is where Los Angeles projects often stall.
6. 5% retention for 30 days after completion. Keep a small retention to cover punch-list items that appear in the first month. Some contractors resist retention. If they won’t agree to 5% held for 30 days, that’s a signal about how they handle callbacks.

This schedule keeps you never more than 10% ahead of the work on the ground, which is exactly where you want to be.

Common Mistakes to Avoid

• Hiring the first contractor who answers the phone. Los Angeles has a deep bench of ADU contractors, and the best ones are often booked out. The contractor with immediate availability might be new, or might have a reason nobody’s hiring them. Interview at least three.
• Believing a reference without asking about the process. Did the contractor show up on time? Did the price change during the job? Would the homeowner hire them again for a different project? These questions get you farther than “were you happy with the work.”
• Skipping the permit because “it’s just a garage conversion.” An unpermitted ADU in Los Angeles becomes a liability when you sell, refinance, or file an insurance claim. It also can’t legally be rented, which defeats the purpose for many homeowners. Pull permits. Always.
• Comparing only the bottom-line number. A bid that’s $30,000 lower than the others is not a bargain. It’s a scope you haven’t read carefully yet. Go line by line before you get excited.
• Accepting a verbal guarantee. “We stand behind our work” is a sentence. A written guarantee with a named period, a named process, and a named owner is a commitment. Get it in writing before work starts.
• Ignoring the payment schedule because the total price is right. You can negotiate a fair total price and still get a payment schedule that puts you at risk. Hold the line on the schedule.
• Not asking about lien releases. A subcontractor who doesn’t get paid can file a lien against your Los Angeles property even after you’ve paid the general contractor in full. Verify lien release procedures before you sign.

When to Call a Professional

Some homeowners are tempted to run their ADU project as an owner-builder, managing permits and subcontractors themselves. That works for a small percentage of people who have construction experience and time. For everyone else, the complexity of Los Angeles permitting, the coordination of five or six trades, and the risk of an expensive mistake make professional management worth the cost. If you’re planning a detached ADU with new foundation work, a garage conversion with structural changes, or any project that involves moving plumbing or electrical service, hire a general contractor who does this every day and knows how to handle surprises-see our ADU Builders Troubleshooting: Common Problems and How to Fix Them for what can go wrong. Lodgewick ADU Builders offers free estimates in Los Angeles. Call (254) 602-5618 to talk through your project and get a written scope and price.

Frequently Asked Questions

The Bottom Line

Hiring an ADU contractor in Los Angeles is not about finding someone who says the right things. It’s about finding someone who writes them down. The five documents, the interview questions, the red flags, and the bid-comparison method all serve one purpose: to reveal whether a contractor operates with a real process or a convincing story. Los Angeles gives you plenty of choices, which means you can afford to be selective. Ask for written commitments. If a contractor won’t put a price, a schedule, and a guarantee on paper before work starts, you already know what the project will feel like after it begins. Choose the contractor who writes it down.

Written by Russ Delmar, Owner at Lodgewick ADU Builders, serving Los Angeles since 2010.