A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Los Angeles, CA
ADU construction in Los Angeles runs $250 – $450 per square foot for site-built projects and $180 – $350 per square foot for prefab, with most complete backyard units landing between $150,000 and $380,000 depending on size, foundation work, and utility runs. What makes Los Angeles jobs different from the rest of California is the combination of older housing stock, hillside lots, strict seismic requirements, and a patchwork of local planning rules that change block by block. Whether you’re adding a detached unit behind a 1920s bungalow in West Adams or converting a garage off a 1950s ranch in the Valley, the process starts with a written price, not a handshake. Call (903) 568-7222 to talk through your property.
Why Los Angeles Homes Are Different
Los Angeles housing runs the full spectrum: Craftsman bungalows from the 1910s in Highland Park, mid-century ranch homes across the San Fernando Valley, Spanish Revival courtyards in Mid-City, and a growing stock of hillside homes in areas like Mt. Washington and Baldwin Hills. That variety means no two ADU projects start the same way. Soils shift from sandy loam near the coast to dense clay and rock as you move inland, and hillside lots frequently require deeper footings, retaining walls, or stepped foundations before a single panel arrives.
Seismic code is a real factor here. Los Angeles requires engineered tie-downs, shear wall detailing, and foundation anchoring that flat-city builders in other states never think about. Older homes also bring surprises: knob-and-tube wiring, cast-iron drain lines, and foundations that have settled over 80 years of dry summers and wet winters. When we price a Los Angeles project, we account for those realities in writing before work starts, so the number you approve is the number you pay. A home addition or ADU here is a different animal than in a newer, flatter market, and the plan should reflect that.
Our Main Los Angeles Services
Los Angeles homeowners call us most often about two things: building a detached ADU in the backyard and expanding the main house with a full addition. Both start with a written price and end with the 365-Day Done Right Promise in writing. Here’s what each looks like in Los Angeles:
ADU Builders in Los Angeles
An ADU in Los Angeles is typically a detached one- or two-bedroom unit in the rear yard, built either site-by-site or with prefab panels from brands like Abodu and Cover. The job almost always involves trenching new sewer and water lines, upgrading the main panel, and navigating the city’s specific setback and height rules. In neighborhoods like Mar Vista and Eagle Rock, we regularly see garages converted into ADUs because the existing slab and roofline save real money on framing and foundation work. Prefab panels change the calculus here: factory-built walls cut on-site framing time by weeks, which matters when you’re paying Los Angeles labor rates. Read the full breakdown on our ADU Builders in Los Angeles page.
Home Addition Contractor in Los Angeles
A home addition in Los Angeles means expanding the main house’s footprint, usually to add a primary suite, a family room, or a second story over an existing single-story home. These projects are more involved than ADUs because they tie directly into the existing structure, which means matching rooflines, extending HVAC runs, and often reinforcing the original foundation. On a typical 1950s Valley ranch, we’re usually adding 400 to 700 square feet and upgrading the panel at the same time, because the existing 100-amp service can’t handle the new load. The work happens while you keep living in the house, so dust control and daily cleanup are part of the job, not an afterthought. Details and pricing are on the Home Addition Contractor in Los Angeles page.
Room Addition Contractor in Los Angeles
A room addition in Los Angeles is the smaller sibling: a single bedroom, home office, or sunroom, usually 150 to 400 square feet, attached to the side or rear of the house. These are the fastest way to add usable space without a full second-story build. On lots in neighborhoods like Leimert Park and Glassell Park, a room addition often works well when the backyard is too small for a detached ADU but the side yard has unused space. Foundation work still matters, and we still pull permits and pass inspections, but the timeline is shorter than a full addition. See the Room Addition Contractor in Los Angeles page for what a room addition costs and how long it takes.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Los Angeles
We’re authorized to build with Abodu, Dvele, and Mighty Buildings prefab systems, each with different panel types, finish levels, and lead times. Panels are delivered to the Los Angeles site on a schedule matched to your foundation and utility work. You can research every brand yourself before committing; see our brands for the full list and what we stock.
Pricing for ADU Company in Los Angeles, CA
| Service | Typical range in Los Angeles |
|---|---|
| Detached ADU (site-built, 400 – 800 sq ft) | $150,000 – $340,000 |
| Detached ADU (prefab, 400 – 800 sq ft) | $120,000 – $280,000 |
| Garage conversion ADU | $90,000 – $180,000 |
| JADU (attached junior unit) | $70,000 – $130,000 |
| Home addition (400 – 700 sq ft) | $120,000 – $260,000 |
| Second-story addition | $180,000 – $380,000 |
| Room addition (150 – 400 sq ft) | $60,000 – $130,000 |
| Panel upgrade (100A to 200A) | $4,000 – $8,000 |
| Foundation / retaining wall work | $8,000 – $40,000+ |
Hillside lots and access problems push Los Angeles prices higher than flat-ground neighborhoods, because equipment, demolition hauling, and structural work all cost more when a crane or bobcat can’t reach the build site. That’s exactly why we put the price in writing before any work starts: you see the full number upfront, and it doesn’t move unless you change the scope.
Neighborhoods We Serve in Los Angeles
Our Los Angeles office dispatches crews across the metro from the Valley to the Harbor. Scheduling runs on confirmed arrival windows, not four-hour guesses, and our technicians are background-checked and uniformed on every job site. The neighborhoods below are a representative slice, not the whole map:
- Eagle Rock and Highland Park (hillside lots, older foundations)
- Mar Vista and Culver City-adjacent (compact lots, garage conversions)
- Sherman Oaks and Encino (ranch-style homes, ADU-ready yards)
- Leimert Park and West Adams (historic homes, careful tie-ins)
- San Pedro and Wilmington (Harbor-area homes, coastal wind load)
Service Area – Cities Near Los Angeles
In addition to Los Angeles itself, our crews cover the surrounding South L.A. and Gateway Cities area, including Huntington Park, CA, South Gate, CA, Bell, CA, and Maywood, CA. If you’re in one of those cities and planning an ADU or addition, call the same (903) 568-7222 number and ask for the Los Angeles office.
Serving Los Angeles, CA - Our Local Coverage Area
We’re based in the Los Angeles area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in Los Angeles
We schedule free estimates in Los Angeles typically within a few business days, and we confirm a written arrival window ahead of time. The estimate is a written line-item price, not a verbal ballpark. Call (903) 568-7222 to book a time that works.
California state law limits HOA and local government restrictions on ADUs, but some neighborhoods and condo communities have their own architectural review steps. We can confirm what applies to your specific property during the estimate, and we handle permit paperwork as part of every project.
Hillside and tight-access lots are common in Los Angeles, and they affect foundation work, equipment choice, and sometimes the structural design. We assess the site during the free estimate and account for every added cost in the written price before you approve anything. Call (903) 568-7222 to get started.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Los Angeles Customers Say
"Booked a consult online and met the project manager two days later. Weekly progress updates arrived by text with photos. ADU finished on schedule."
- Hannah W."Clean, quiet crew. They respected the neighbors, kept noise to working hours, and swept the driveway every evening."
- Hope C."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N.
