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A prefab ADU in Los Angeles costs roughly $264,000 to $500,000 installed, based on the prices three of the largest prefab companies publish today. The price shown on a model page often covers only the factory-built unit. The foundation, utility trenching, crane, and site work are charged on top of it, and where a company publishes that figure it runs $64,000 to $105,000. We have designed and permitted ADUs across Los Angeles County for nearly a decade, and the question we hear most from homeowners comparing options is not “prefab or site-built?” It is “what will this cost me by move-in day?”
This guide answers that with published numbers from three companies: Abodu, Samara, and Villa. Every prefab price below was read from the company’s own website on November 11, 2026: Abodu’s pricing page, Samara’s model lineup and FAQ, and Villa’s product catalog and pricing page. These are “from” prices and each site says they can change, so treat them as a snapshot of that date and check the source before you rely on one. Our own numbers come from our current price list.
Prefab ADU Cost in Los Angeles: The Published Prices
The three companies publish three different kinds of number, which is the first thing to understand before you compare them.
| Abodu | Samara | Villa | |
|---|---|---|---|
| What the published price is | Home price + typical installation = “expected all-in” | Unit price, “plus installation” | “Complete project pricing from” |
| Smallest model | 385 sqft studio: $298,800 all-in | 420 sqft studio: $152,000 plus installation | 435 sqft 1BR: $264,000 |
| About 800 sqft, 2BR/2BA | $424,800 all-in | $249,000 plus installation | $327,000–$357,000 |
| Largest model | 1,195 sqft 3BR: $498,800 all-in | 950 sqft 2BR: $277,000 plus installation | 1,185 sqft 3BR: $394,000 |
| Installation figure | $64,000–$105,000 by model | Not published | Bundled into the price |
| Stories | One | One | One |
Divide those totals by the square footage and the pattern is clear: the smallest units cost the most per square foot. Abodu’s studio works out to about $776 per square foot all-in, its 800 sqft model to about $531, and its largest to about $417. Villa runs from about $607 per square foot at 435 sqft down to about $332 at 1,185 sqft. That arithmetic is ours, from their published figures. Fixed costs like the crane, the foundation, and the utility connections do not shrink with the home.
What the Published Price Covers and What It Leaves Out
A factory-built ADU arrives finished, but it still has to sit on something, connect to something, and get lifted into place. Abodu is the most transparent about this, and its own breakdown is the best way to see where the money goes.
The home price covers the factory-built unit, design, engineering, permits and plan check, fire sprinklers, and delivery to your property. The installation price covers the foundation and site work, utility trenching up to 50 feet with connections, and a crane set up to 100 feet. For its studio that is $234,800 for the home and $64,000 for installation. For its largest model it is $393,800 and $105,000.
Installation is 18 to 23 percent of the published total across that lineup. On a prefab ADU, roughly one dollar in five is work that happens in your yard, done the conventional way.
When the Installation Price Is Not Published
Samara publishes the price of the unit and adds “plus installation,” without a figure. The installation work it describes is close to what Abodu prices at $64,000 to $105,000: a standard foundation, utility connections, a crane, permit allowances, and a survey. Ask for the installation number in writing before you put a unit price next to anyone else’s total.
What Pushes a Prefab ADU Past Its Published Price
Each company lists, on its own site, the conditions that add cost. Read together, they describe a large share of Los Angeles lots.
| Allowance or extra | Abodu | Samara | Villa |
|---|---|---|---|
| Utility trenching included | 50 ft | 50 ft water, 75 ft electrical, 100 ft sewer | 100 ft each |
| Crane | Included to 100 ft | Included to 125 ft | Listed as an added cost |
| Fire sprinklers | Included | Listed as an added cost | Listed as an added cost |
| Boundary survey | $6,000, quoted separately | Included | Not stated |
| Sales tax | Quoted separately | Not stated | Not stated |
| Also listed as extra | Demolition, tree removal, unique site engineering | Demolition, tree removal, electrical service upgrades, limited access that requires hand digging, deep lots that need a larger crane | Demolition, tree removal, grading on a 5–20% slope, clay or bedrock, trenching through anything but dirt |
Crane reach is the one that surprises people. A finished module has to travel from the street to the back of the lot through the air. If the house, a power line, or a mature tree is in the way, the crane gets bigger or the plan changes. Samara notes that delivery day can require a street closure.
Trenching distance is the second. Fifty feet does not reach the rear of many Los Angeles lots from the main house’s connections, and every foot past the allowance is quoted separately.
Sprinklers depend on your house, not the ADU. State law says sprinklers cannot be required in an ADU if they are not required for the primary residence (Gov. Code §66323(d)). Whether a quote includes them matters only if your main house has them.
None of this is a criticism. The companies publish these lists so nobody is surprised. But a “from” price assumes a flat lot with short utility runs and a clear path for a crane, and a homeowner should know whether that describes their yard before comparing totals.
Where a Prefab ADU Makes Sense
Prefab earns its place. If the following describes your project, it deserves a serious look.
- Your lot is flat with open access. A wide driveway or an alley, no overhead lines, and a short run to the sewer keep the installation near the published figure.
- You want the least time with a crew in your yard. Site preparation takes about a month and the unit is set in a day. That is a real difference for a household living through the project.
- You want one contract with one total. Abodu writes the expected all-in figure into the purchase agreement before construction starts. That certainty has value, and a build priced by estimate cannot match it.
- A single-story home of the published size is what you want. The lineups run from about 385 to 1,200 square feet in fixed layouts.
On schedule, the advantage is narrower than most people expect. Samara publishes “as few as seven months” from configuration to completion, about five of them in permitting. A CALI ADU Signature Home, one of our pre-designed plans built on site, runs six to nine months start to finish. The factory saves weeks on site. It does not shorten the city’s review.
Prefab vs. a Site-Built Plan at the Same Size
Here is the comparison homeowners ask us for, using CALI ADU Signature Homes: nine pre-designed, permit-ready plans that are built on site. Our side is two numbers: a fixed plan price for design and full permit processing, and an estimated cost to build, based on recent similar projects; your builder confirms the price for your lot. The combined figure below is the plan price plus the midpoint of the build estimate. Build with our construction partner or your own licensed contractor.
| Size | Abodu (all-in) | Villa (complete project) | CALI ADU Signature Home | Plan Price | Est. Cost to Build | Plan + build midpoint |
|---|---|---|---|---|---|---|
| Studio, about 400 sqft | $298,800 (385 sqft) | $264,000 (435 sqft, 1BR) | The Wilshire, 400 sqft | $7,490 | $180K–$200K | about $197,000 |
| 1BR, about 500–550 sqft | $324,800 (500 sqft) | $278,000 (561 sqft) | The Westwood, 550 sqft | $8,990 | $215K–$235K | about $234,000 |
| 2BR/2BA, about 800 sqft | $424,800 (800 sqft) | $327,000–$357,000 (786–800 sqft) | The Melrose, 800 sqft | $8,990 | $275K–$295K | about $294,000 |
| 3BR, about 1,000–1,200 sqft | $464,800 (1,070 sqft) | $341,000–$394,000 (987–1,185 sqft) | The Lincoln, 1,000 sqft | $12,990 | $325K–$350K | about $350,000 |
Read this table carefully, because the numbers are not the same kind of number. The prefab figures are published starting prices from companies that sell a finished, installed home. Ours is a fixed plan price plus an estimate for construction that your builder confirms. Three things make the comparison fair:
- What our build estimate covers: a move-in-ready home, from foundation through finishes and appliances, with utility connections up to 75 linear feet.
- What sits outside it: city plan check and permit fees (typically $3,000 to $6,000 in Los Angeles), upgrades to the existing house such as an electrical panel or sewer lateral, soils or survey reports where the city requires them, and utility runs past 75 feet.
- What neither side can price from a website: your lot. Slope, access, and the distance to your utilities move every one of these totals.
With those caveats, the published prices do not support the common assumption that factory-built is the less expensive route in Los Angeles. At the studio and two-bedroom sizes the site-built figure is lower than either prefab total. At the top of the range Villa’s largest single-story model lands near our three-bedroom. For the line-by-line version of our side, see what it costs to build an ADU in Los Angeles.
The Limit Prefab Cannot Design Around: One Story
Every model in all three lineups is a single story. Villa says so directly in its FAQ: it is not able to offer a two-story ADU or an ADU on top of a garage at this time. The reason is physical. A module has to fit on a truck and hang from a crane, which caps its width and makes stacking a second floor a different product.
That matters most on the lots where an ADU is hardest to fit. Samara publishes the clear area its models need including setbacks: 39 by 25 feet for the studio and 57 by 25 feet for the two-bedroom. A two-story plan puts the same bedrooms on roughly half the ground. Our two-story Fairfax is a two-bedroom on a 14-by-32-foot footprint.
A completed two-story ADU in Culver City, designed by CALI ADU: the Fairfax, modified for a courtyard lot.
Our three two-story models share one fixed plan price of $12,990. The estimated cost to build is $280K–$310K for the Fairfax (2BR/1.5BA, 840 sqft), $335K–$365K for the Venice (2BR/2.5BA, 1,080 sqft), and $385K–$420K for the Culver (3BR/2.5BA, 1,200 sqft). If your yard is the constraint, start with how two-story ADUs work in Los Angeles and the two-story plans.
Which One Fits Your Lot
| Your situation | Better fit | Why |
|---|---|---|
| Flat lot, alley or wide driveway, short utility run | Either | Prefab installs near its published price; compare totals directly |
| You want one contract and a locked total | Prefab | An all-in figure written into the agreement before construction |
| Narrow side yard, overhead lines, or a house between the street and the build site | Site-built | Materials walk in; nothing has to be craned over the house |
| Sloped lot or poor soil | Site-built | Prefab lists slope and soil as added cost; a site-built foundation is designed for the lot |
| Small yard, or you want to keep the yard | Two-story site-built | No prefab lineup we reviewed offers a second story |
| You want to choose your own builder | Site-built | A permit-ready plan can be built by any licensed contractor |
The most useful thing you can do before requesting any quote is find out what fits. Measure the clear path from the street to the build site, the distance from your sewer and electrical connections to the back of the lot, and the open area after setbacks. Those three facts decide which of these totals applies to you. The CALI ADU Signature Home plans list the footprint, the plan price, and the estimated cost to build for every model, so you can run the same check on our side.
