ADU Cost in Los Angeles - Design, Permits and Build Under One Contract

How Much Does ADU Cost in Los Angeles?

An accessory dwelling unit (ADU) in Los Angeles typically costs between $120,000 and $450,000 in 2026, depending on whether you convert an existing garage or build new construction, and whether you choose a prefab unit or a custom stick-built structure. A straightforward garage conversion usually lands between $120,000 and $180,000. A detached new-construction ADU averages $250,000 to $400,000. Prefab units from manufacturers like Abodu or Cover can reduce both cost and timeline, often coming in between $150,000 and $280,000 installed. Those numbers include design, permits, site work, and finishes for a 400 to 1,000 square foot unit on a typical Los Angeles lot.

We’re Lodgewick ADU Builders, the ADU company of the Kingswell family. We’ve been putting written prices in front of homeowners before work begins since 2010, and we answer every call with a live person, day or night. This guide breaks down real Los Angeles pricing line by line, explains what pushes costs up or down in this market, and shows you where you can save without cutting corners.

ADU Cost Breakdown (2026)

Every ADU is priced by scope, but the line items rarely change. Here’s what each phase costs in the Los Angeles market this year, based on the projects we build across the city.

What drives the number up or down? Site conditions matter more than most homeowners expect. A flat lot in Reseda with alley access is a very different build from a hillside lot in Mount Washington where the crew needs a crane and retaining work. Utilities are the second big swing: if your electrical panel is an older 100-amp service, upgrading to 200 amps and running a new line to the ADU can add $7,000 to $15,000. And finishes are where budgets either hold or quietly grow. Quartz counters and custom tile look beautiful, but they add real dollars fast. We write the price before any work starts, so you see these ranges fixed on paper for your specific lot, not as a guess in an estimate call.

What Affects ADU Pricing in Los Angeles

Los Angeles isn’t a generic ADU market. Several local forces shape every quote, and knowing them helps you read estimates more clearly.

• LADBS permit process and plan check time. The Los Angeles Department of Building and Safety handles ADU permits under state rules that changed significantly in recent years. Plan check can run several weeks to a few months depending on backlog and whether your design needs corrections. Faster, cleaner submittals save money because design revisions and re-submittal fees add up.
• Hillside, coastal and fire-zone overlays. If your property sits in a Very High Fire Hazard Severity Zone, common in areas like Sherman Oaks, Studio City and the hills above the Valley, you’ll pay more for fire-rated materials, ember-resistant vents and sometimes additional clearance. Coastal zones bring their own review layers. These are real line items, not vague surcharges.
• SoCal Edison service connections and panel upgrades. Los Angeles is served largely by LADWP, with Southern California Edison covering surrounding areas. Either way, tying an ADU into your main electrical service often means a panel upgrade and coordination with the utility. That coordination adds cost and time.
• Lot access and staging room. A lot where a truck and crew can back right into the rear yard costs less to build on than one where materials have to be carried or craned in. Alley access, driveway width and setback clearance all affect labor hours.
• Type of ADU you choose. A garage conversion reuses your existing foundation and walls, so it’s almost always the cheapest path. A detached new-build costs more because you’re starting from bare dirt. A JADU (junior ADU) is a smaller unit built inside or attached to your main home, capped at 500 square feet, and often the least expensive option if your home can accommodate one.
• Prefab versus custom construction. Prefabricated units from brands like Dvele, Mighty Buildings, Boxabl, Plant Prefab or Abodu can cut construction time and lock in material costs because the panels or modules are built in a factory. Custom builds offer more design flexibility but carry more variable labor cost. We match the approach to your lot, budget and timeline rather than pushing one route.

Real-World Examples: What Los Angeles Homeowners Actually Pay

Ranges only mean so much until you see them attached to a specific property. Here’s a sense of how the numbers land across different situations we see regularly.

In Pacoima, a homeowner converted a two-car detached garage into a 480 square foot one-bedroom unit with a kitchenette and full bath. The garage had a solid slab, easy driveway access and a newer panel, so the project stayed on the lower end, landing under $160,000.

In Northridge, a family built a 700 square foot detached ADU in the backyard for an aging parent. The lot was flat but the main panel needed upgrading and the city required a correction cycle on the design. Total came in around $285,000 including finishes.

In Echo Park, a hillside lot with limited street access required a crane to set the modules for a prefab unit. Even with the access premium, the prefab route kept the timeline tighter than a custom build would have. Most of these projects see a garage conversion saving roughly 30 to 40 percent versus building detached new construction, which is why we ask about your existing structures first.

How to Save on ADU

You don’t have to overpay to build well. A few decisions move the price meaningfully.

• Convert instead of build new. If you have a detached garage in decent structural shape, a garage conversion reuses the foundation and framing you already paid for. That’s the single biggest savings available to most homeowners.
• Choose a prefab unit when the lot allows. Factory-built modules from makers like Abodu or Boxabl cut on-site labor hours and shorten the schedule, which reduces carrying costs.
• Keep the unit a rectangle. Simple footprints cost less to frame, roof and finish. Every jog in the wall adds labor and materials.
• Plan the utilities early. Knowing whether you need a panel upgrade before design starts prevents redesign fees later.
• Get the design right the first time. Corrections during plan check are one of the most avoidable costs. A designer who knows LADBS requirements saves you the re-submittal fees and the delay.
• Stay within 500 to 750 square feet. State law allows ADUs up to 1,200 square feet in many cases, but a smaller unit does the same job for less if you don’t need the space.

None of this means cutting corners on the parts that matter: weatherproofing, electrical, plumbing and structure. Saving money on finishes is smart. Saving money on the stuff inside the walls is not. We’ll walk your lot and give you a written price before any work begins, so you know the real number up front. Free estimates, no pressure, just a clear scope. Call (254) 602-5618 and we’ll set a time to look at your property.

JADU, Garage Conversion or Detached ADU: Which Costs Least?

A JADU usually costs the least, then a garage conversion, then a detached new-build. A junior ADU is a small unit, no more than 500 square feet, created within your existing home or an attached structure, and it can share your kitchen and bathroom in some configurations, which keeps plumbing and utility work minimal. A garage conversion is next: you keep the slab and walls, so you skip foundation and much of the framing. A detached ADU is the most expensive because everything is new, from foundation to roof, and the site has to be prepared from scratch. If budget is your main concern, start by asking whether your home or garage can support a smaller unit before committing to full new construction.

Do You Need a Separate Electrical Panel for an ADU in Los Angeles?

Not always, but often yes, and a panel upgrade typically adds $7,000 to $15,000 in Los Angeles. Many older homes here run 100-amp service, and adding a full ADU with its own kitchen, HVAC and laundry pushes that service past its limit. In those cases the panel is upgraded to 200 amps and a new feeder line is run to the unit. Sometimes the existing service has capacity and no upgrade is needed, which is exactly the kind of thing a site visit reveals. Because electrical work carries real risk, this is a job for a licensed electrician, and every Lodgewick project uses background-checked, uniformed technicians so you always know who’s on your property.

FAQs – ADU Cost in Los Angeles

How much does an ADU cost in Los Angeles in 2026?

An ADU in Los Angeles costs roughly $120,000 to $450,000 in 2026. Garage conversions typically run $120,000 to $180,000, prefab units $150,000 to $280,000 installed, and detached new construction $250,000 to $400,000 or more depending on site conditions and finishes. Call (254) 602-5618 for a written price on your specific lot; estimates are free.

Is it cheaper to convert a garage or build a new ADU in Los Angeles?

Converting a garage is almost always cheaper, usually 30 to 40 percent less than building detached new construction, because you reuse the existing foundation and framing. A typical Los Angeles garage conversion lands between $120,000 and $180,000, while a detached ADU starts around $250,000. Call (254) 602-5618 and we’ll tell you honestly which route your lot supports.

How long does it take to build an ADU in Los Angeles?

A garage conversion usually takes three to five months including permits, and a detached or prefab ADU typically runs five to nine months. Plan check with LADBS is often the longest stretch, and corrections can add weeks. Prefab units from makers like Dvele or Mighty Buildings shorten the on-site phase. Call (254) 602-5618 to talk through timeline for your project.

Does an ADU add value to a Los Angeles home?

Yes. An ADU in Los Angeles commonly adds rental income potential and resale value, and in a market where median home prices sit well above $900,000, a permitted unit is a meaningful asset. A legal, permitted ADU tends to hold value better than an unpermitted one because buyers and lenders can finance it cleanly. Call (254) 602-5618 if you want to talk through what a permitted unit means for your property.

Will you give me a price before the work starts?

Yes, always. We provide a written price before any work begins, on every project, with no changes at the door. That commitment is part of The Kingswell Guarantee, along with a defined arrival window, a clean job site, and a 365-Day Done Right Promise: if the work isn’t right, we come back and make it right, with a free return visit if something fails within the guarantee period. Call (254) 602-5618 for your free estimate.

Why Homeowners in Los Angeles Choose Lodgewick

We’re part of the Kingswell family of home-service companies, building ADUs, garage conversions and home additions since 2010. A lodge is a small house on a larger property, which is exactly what an ADU is, and that’s the name we chose on purpose. We use materials and prefab systems from established names like Abodu, Cover, Dvele, Mighty Buildings, Boxabl, Plant Prefab, Tuff Shed and James Hardie, and we match them to your lot instead of pushing a favorite. When you call, a live person answers, 24 hours a day, seven days a week.

Every Lodgewick location is independently owned and operated under The Kingswell Guarantee. Whether your lot is in Pacoima, Northridge or Echo Park, you get the same written commitments: the price before the work, the arrival window we gave you, a crew that leaves the site cleaner than it found it, and a written guarantee we stand behind for a full 365 days. Learn more about how we work before you decide.

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

Pricing reflects the Los Angeles market as of 2026. Lodgewick ADU Builders offers free estimates – call (254) 602-5618.