Frequently Asked Questions About ADU Service in Los Angeles
Most detached accessory dwelling units (ADUs) in Los Angeles run between $180,000 and $320,000 before site work, depending on size, foundation, and utility runs. Below are the questions homeowners ask us most, grouped by topic, with real numbers and plain answers. If your question isn’t here, call us at (472) 248-8213 and a live person will pick up.
Key Takeaways
- Written price delivered before any work starts – always, on every project.
- 365-Day Done Right Promise covers workmanship for one full calendar year from completion.
- Every technician is background-checked, identity-verified, uniformed, and photo-badged. You get their name and photo before they arrive.
- Live person answers every call, 24 hours a day, 7 days a week.
- Sutton ADU Builders has worked with Abodu, Cover, Dvele, Mighty Buildings, Boxabl, and Plant Prefab, plus Tuff Shed conversions and James Hardie exterior systems.
Pricing & Estimates
How much does an ADU cost in Los Angeles?
Most detached ADUs in Los Angeles run $180,000 to $320,000 before site work, and garage conversions typically land between $95,000 and $180,000. Site work – grading, utility trenching, and any hillside engineering – can add $20,000 to $65,000 depending on your lot. In the flat parts of the San Fernando Valley, trenching is usually straightforward; in the hills above Studio City or near Glassell Park, slope and drainage work push that number higher. We put every dollar in a written price before we lift a tool, so you can see the full scope before you commit.
| Project Type | Typical Range (Before Site Work) |
|---|---|
| Detached new-build ADU (600-900 sq ft) | $180,000 – $320,000 |
| Garage conversion ADU | $95,000 – $180,000 |
| Junior ADU (JADU, interior conversion) | $55,000 – $110,000 |
| Room addition (non-ADU) | $65,000 – $175,000 |
| Prefab/modular installed (Abodu, Boxabl, etc.) | $120,000 – $280,000 |
Do you offer free estimates?
Yes, estimates are free and there’s no obligation. We walk your lot, check setbacks, review utility access, and give you a written price – usually within a few business days. That written price is the number you’ll see on the final invoice unless you change the scope yourself. No surprise line items, no scope creep passed silently to the bill.
Is it cheaper to build a garage conversion or a detached ADU?
A garage conversion is almost always cheaper than a detached new build in Los Angeles, typically $95,000 to $180,000 versus $180,000 and up. You’re reusing the existing foundation and at least one wall, which cuts both materials and permitting complexity. The trade-off is square footage and ceiling height, so if you need a two-bedroom layout with full headroom throughout, a detached unit usually serves you better. We’ll tell you honestly which one fits your lot and budget.
How do payments work on an ADU project?
We use progress-based payments tied to completed milestones, not one lump sum up front. The schedule is written into your contract before work begins. We accept checks, ACH transfers, and major credit cards. For prefab units like Abodu, Cover, or Dvele, payment terms follow the manufacturer’s schedule plus our site work and installation fees, and we spell that out in writing so there are no crossed wires.
Service, Scheduling & Scope
How fast can you respond to a call?
A live person answers every call, 24 hours a day, 7 days a week – no voicemail trees, no callback queues. For time-sensitive questions on active builds, you’ll talk to someone who knows your project. For new inquiries, we typically schedule a site visit within a few business days.
Do you offer emergency ADU service?
We don’t run an emergency repair line the way a plumber does, but we do answer the phone around the clock. If something fails on a project we built – a leak, a door that won’t seal, an electrical issue – call us any hour and we’ll get it triaged. Because of our 365-Day Done Right Promise, if it’s a workmanship defect within the first year, we come back and fix it at no charge. That’s the free second visit, no haggling.
Do you handle ADU design and permitting?
Yes, we handle design and permitting as part of the project. That includes architectural drawings, structural calculations, Title 24 energy compliance, and submission to the Los Angeles Department of Building and Safety. Los Angeles has its own ADU ordinance layered on top of state law, and the rules on setbacks, height, and parking change more often than most homeowners expect. We track those changes because getting a plan kicked back for a setback miscalculation can cost you a month.
What areas do you serve?
We serve homeowners across Los Angeles and the surrounding communities. That includes the San Fernando Valley, the Westside, South LA, the Eastside neighborhoods, and the foothill communities. Different areas have different lot geometries and soil conditions, and we plan for that.
Do you handle garage conversion ADUs?
Yes, garage conversions are one of our most common projects. A garage conversion ADU typically runs $95,000 to $180,000 and takes 3 to 5 months from permit to final inspection. The main variables are whether the existing slab can carry the load, whether you need a full kitchen and bathroom, and how much of the existing framing can stay. In older LA garages, we often find termite damage or undersized headers that need replacing, which we identify during the initial walk-through so it’s in the written price.
Do you handle new detached ADUs?
Yes, detached new-build ADUs are our core specialty. These are ground-up structures, usually 600 to 1,200 square feet, with their own foundation, utilities, and address. Most detached builds in Los Angeles run $180,000 to $320,000 before site work. We work with prefab and modular brands including Abodu, Cover, Dvele, Mighty Buildings, Boxabl, and Plant Prefab, and we also build stick-framed custom units. We’ll walk you through which product line actually fits your lot.
Do you handle junior ADUs and interior conversions?
Yes, we build junior ADUs (JADUs) and interior conversions as well. A JADU is a smaller unit, up to 500 square feet, carved out of existing living space – often a spare bedroom suite with a kitchenette. In Los Angeles, JADUs have different code requirements than standard ADUs, and they can sometimes be permitted faster. Typical cost is $55,000 to $110,000 depending on how much plumbing and electrical work is needed.
Do you build room additions that aren’t ADUs?
Yes. Alongside ADU work, we build home additions in Los Angeles – primary suite additions, family room extensions, and second-story builds. These often run $65,000 to $175,000, though second-story additions cost more because of structural reinforcement. If you’re not sure whether an ADU or a room addition makes more sense for your lot, we’ll explain the trade-offs in plain terms.
Can you convert a Tuff Shed or existing outbuilding into an ADU?
Often yes, but it depends on the structure. A Tuff Shed conversion works if the slab, framing, and ceiling height meet code. Many standard sheds don’t have the right foundation or wall thickness for habitable space, so we assess it before pricing. If a full conversion isn’t practical, we’ll tell you rather than sell you a build that won’t pass inspection.
Licensing, Trust & Guarantees
Are you licensed and insured?
Yes, Sutton ADU Builders is a licensed and insured contractor, and we’re part of the Threshold Group family of home-service companies. Every project is governed by the Threshold Standard, which means specific, written commitments on pricing, crew vetting, and workmanship. We’re happy to provide documentation at the start of your project.
Do you guarantee your work?
Yes. The 365-Day Done Right Promise covers defects in workmanship for one full calendar year from project completion. If something isn’t right, we come back and make it right at no additional cost. And if any element of the build fails, you get a free second visit with no haggling and no fee. That’s a written guarantee stamped on every project, not a verbal assurance.
Who will actually show up at my house?
You’ll know before they arrive. Under the Threshold Standard, every technician is background-checked and identity-verified, and we send you their name and photo before the visit. They arrive in a clean, marked uniform and show a photo ID badge at the door – every time. For homeowners who are often home alone, or who have young children, that matters more than a discount. You shouldn’t have to wonder who’s knocking.
Who leads Sutton ADU Builders?
Miles Hartwell leads Sutton ADU Builders. Miles founded the company’s approach around a simple idea: homeowners deserve a name, a face, and a written price before anyone sets foot on their property. That’s been the standard since 2006, and it’s why the Threshold Verified process exists. When Miles talks about the work, he’s usually talking about trust – not square footage.
How long have you been in business?
Sutton ADU Builders was founded in 2006 as the ADU-specialist member of the Threshold Group family. That’s nearly two decades of building in Southern California. We’ve seen the ADU rules in Los Angeles change repeatedly, and we’ve adapted our process with each update. Each Sutton location is independently owned and operated under Threshold Verified standards, so the same written guarantees apply wherever you’re building.
How an ADU Project Works, Step by Step
- Free site visit and written estimate. We walk your lot, check setbacks (the required gap between your new structure and the property line), review utility access, and confirm what’s feasible. You get a written price before any work starts.
- Design and engineering. Architectural drawings, structural calculations, and Title 24 energy compliance are prepared. For prefab units like Abodu, Dvele, or Plant Prefab, we coordinate the manufacturer’s specs with your site.
- Permitting. We submit to the Los Angeles Department of Building and Safety and manage the review process, including any corrections the plan checker requests.
- Site prep and foundation. Grading, drainage, and foundation work. Roof work and any hillside excavation are handled only by trained crew with proper fall protection and shoring – it’s genuinely dangerous work and not a DIY job.
- Build or installation. Stick-framed construction or prefab delivery and set. Rough plumbing, electrical, and HVAC are inspected before walls close.
- Finishes and final inspection. Interior finishes, James Hardie exterior cladding, fixtures, and landscaping repair. We coordinate the final inspection and hand over the certificate of occupancy.
- 365-Day Done Right Promise. After completion, the written guarantee covers workmanship for one full calendar year. If anything fails, we come back at no charge.
How long does an ADU take to build in Los Angeles?
A garage conversion typically takes 3 to 5 months from permit to final inspection, while a detached new-build ADU usually takes 6 to 10 months. Permitting itself can run 4 to 12 weeks depending on the plan checker’s queue and whether your lot has overlays like a Hillside or Historic district. Prefab units from Abodu or Boxabl can shorten the on-site build phase, but they don’t shorten permitting. We give you a realistic schedule in writing, not an optimistic one.
Is building an ADU worth it in Los Angeles?
For many LA homeowners, yes – especially if you plan to rent it or house a family member. A one-bedroom ADU in a rentable part of Los Angeles can bring in meaningful monthly income, and it adds usable square footage to your property. Whether it pencils out for you depends on your lot, your budget, and how long you plan to stay. We’ll give you the real numbers, not a sales pitch.
What’s the first step if I’m just starting to think about it?
The first step is a free site visit and a written estimate – no obligation. We’ll tell you what your lot can hold, what it’ll cost, and how long it’ll take. If an ADU isn’t practical for your property, we’ll say so. You can start here or just call us.
Do you offer any guarantee on site work and utilities?
Yes, site work and utility connections fall under the same 365-Day Done Right Promise as the rest of the build. If a trench settles, a drain backs up, or an electrical run fails within the first year, we return and correct it at no cost. Site work is often the part homeowners worry about most because it’s underground and hard to inspect later. Our promise covers it the same way it covers the visible finishes.
What payment methods do you accept?
We accept checks, ACH bank transfers, and major credit cards. For larger projects, the payment schedule is tied to completed milestones and written into your contract. Prefab orders may follow the manufacturer’s deposit terms, which we’ll lay out clearly before you sign anything.
Can you work with my architect or designer?
Yes, we regularly coordinate with homeowners’ own architects and designers. If you already have drawings, we’ll review them for constructability and code compliance before pricing. If something in the plans won’t pass review or will blow the budget, we’ll flag it early rather than discover it mid-build.
If you came here with one specific question in mind, the fastest way to get it answered is a phone call. A live person answers every call, 24 hours a day, 7 days a week, and there’s no obligation. Call (472) 248-8213 for a free estimate – we’ll give you a written price and a straight answer about what your Los Angeles lot can actually hold.
Written by Miles Hartwell, Owner at Sutton ADU Builders, serving Los Angeles since 2006.
Have a question we didn’t cover? Call Sutton ADU Builders at (472) 248-8213.
